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1. Synthesis of multi-amine functionalized hydrogel for preparation of noble metal nanoparticles: utilization as highly active and recyclable catalysts in reduction of nitroaromatics

Author:
Zhang, Lidong; Zheng, Sudan; Kang, Dong Eun; Shin, Jin Young; Suh, Hongsuk; Kim, Il
Source:
RSC advances 2013 v.3 no.14 pp. 4692-4703
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; 2,4-dinitrophenol; X-ray photoelectron spectroscopy; activation energy; catalysts; catalytic activity; chemical reduction; gold; hydrogels; nanogold; nanoparticles; nanosilver; nitroaromatic compounds; palladium; platinum; reducing agents; rheological properties; ruthenium; scanning electron microscopy; silver; sodium borohydride; stabilizers;     Show all 22 Subjects
Abstract:
... A new and one-pot protocol for mass-producable synthesis of the poly(ethylene oxide propylphosphonamidate) (PEOPPA) hydrogel bearing multi-amine and multi-amino groups with excellent swellability and flexibility has been described. The structural characterization of the formed gel was well analyzed by infrared, solid state ³¹P-NMR and X-ray photoelectron spectroscopies, and scanning electron micro ...
DOI:
10.1039/c3ra22864a

2. One-pot green synthesis of silver/iron oxide composite nanoparticles for 4-nitrophenol reduction

Author:
Chiou, Jau-Rung; Lai, Bo-Hung; Hsu, Kai-Chih; Chen, Dong-Hwang
Source:
Journal of hazardous materials 2013 v.248-249 pp. 394-400
ISSN:
0304-3894
Subject:
p-nitrophenol,   etc   ; activation energy; aminophenols; aqueous solutions; catalysts; catalytic activity; iron oxides; nanoparticles; nanosilver; pH; reducing agents; silver; temperature;     Show all 13 Subjects
Abstract:
... Silver/iron oxide composite nanoparticles have been synthesized successfully via a facile one-pot green route by the use of l-arginine, which created an aqueous solution of about pH 10 and acted as a reducing agent for the successive formation of iron oxide and Ag nanoparticles. The product was characterized to be silver-coated iron oxide and iron oxide hydroxide composite nanoparticles with a mea ...
DOI:
10.1016/j.jhazmat.2013.01.030

3. Bimetallic Ag–Au Nanowires: Synthesis, Growth Mechanism, and Catalytic Properties

Author:
Fu, Haitao; Yang, Xiaohong; Jiang, Xuchuan; Yu, Aibing
Source:
Langmuir 2013 v.29 no.23 pp. 7134-7142
ISSN:
1520-5827
Subject:
p-nitrophenol,   etc   ; ambient temperature; aminophenols; catalysts; catalytic activity; gold; nanogold; nanoparticles; nanowires; palladium; reducing agents; silver; vanadium;     Show all 13 Subjects
Abstract:
... Silver–gold (Ag–Au) bimetallic nanowires were controllably synthesized by a newly developed wet-chemical method at room temperature. The Ag nanowires and Au nanoparticles were sequentially formed by reduction with vanadium oxide (V₂O₃) nanoparticles so as to form Ag–Au bimetal, in which the Ag nanowires show a diameter of ∼20 nm and length up to 10 μm. A few unique features were noted in our new a ...
DOI:
10.1021/la400753q

4. Developing green photochemical approaches towards the synthesis of carbon nanofiber- and graphene-supported silver nanoparticles and their use in the catalytic reduction of 4-nitrophenol

Author:
Fernández-Merino, María J.; Guardia, Laura; Paredes, Juan I.; Villar-Rodil, Silvia; Martínez-Alonso, Amelia; Tascón, Juan M. D.
Source:
RSC advances 2013 v.3 no.40 pp. 18323-18331
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; ambient temperature; aminophenols; carbon nanofibers; catalysts; catalytic activity; chemical reduction; graphene; graphene oxide; hydrazine; nanoparticles; nanosilver; photochemistry; reducing agents; sodium borohydride; ultraviolet radiation;     Show all 16 Subjects
Abstract:
... A green, photochemical approach for the liquid-phase synthesis of carbon nanomaterial-supported silver nanoparticles is proposed. The method is based on irradiating a colloidal dispersion containing the carbon nanomaterial, a metal precursor and an environmentally friendly reducing agent (bioreductant) with UV light at room temperature. Two representative carbon materials have been used, namely pl ...
DOI:
10.1039/c3ra41731j

5. Identifying efficient natural bioreductants for the preparation of graphene and graphene-metal nanoparticle hybrids with enhanced catalytic activity from graphite oxide

Author:
Fernández-Merino, M.J.; Villar-Rodil, S.; Paredes, J.I.; Solís-Fernández, P.; Guardia, L.; García, R.; Martínez-Alonso, A.; Tascón, J.M.D.
Source:
Carbon 2013 v.63 pp. 30-44
ISSN:
0008-6223
Subject:
p-nitrophenol,   etc   ; antioxidants; arginine; catalysts; catalytic activity; graphene; histidine; nanoparticles; nanosilver; organic acids and salts; pyridoxamine; pyridoxine; reducing agents; riboflavin; silver; tryptophan;     Show all 16 Subjects
Abstract:
... The implementation of green approaches towards the preparation of graphene and graphene-based materials with enhanced functionality from graphite oxide has been relatively little explored. Particularly, the use of bioreductants and the testing of their relative efficacies is an incipient area of research. Here, a pool of 20 environmentally friendly, natural antioxidants have been tested for their ...
DOI:
10.1016/j.carbon.2013.06.034

6. Facile route fabrication of nickel based mesoporous carbons with high catalytic performance towards 4-nitrophenol reduction

Author:
Yang, Ying; Ren, Yang; Sun, Chengjun; Hao, Shijie
Source:
Green chemistry 2014 v.16 no.4 pp. 2273-2280
ISSN:
1463-9270
Subject:
p-nitrophenol,   etc   ; Raman spectroscopy; X-ray absorption spectroscopy; X-ray diffraction; acetates; adsorption; carbon; catalysts; catalytic activity; cetyltrimethylammonium bromide; chemical reduction; chitosan; desorption; green chemistry; nanoparticles; nickel; nitrogen; porous media; pyrolysis; reducing agents; stabilizers; temperature; texture; transmission electron microscopy;     Show all 24 Subjects
Abstract:
... Novel nickel based mesoporous carbons are firstly in situ fabricated via pyrolysis of CTAB-chitosan-nickel supramolecular aggregates, which are pre-constructed by CTAB-directed self-assembly of 8-quinolinol modified chitosan and nickel acetate under basic conditions. This facile route fabrication method renders smart and homogeneously dispersed Ni nanoparticles (NPs) on the mesoporous carbonaceous ...
DOI:
10.1039/c3gc42121j

7. Facile synthesis of Au@Fe₃O₄–graphene and Pt@Fe₃O₄–graphene ternary hybrid nanomaterials and their catalytic properties

Author:
Lu, Baoping; Zhang, Zhe; Hao, Jinhui; Tang, Jilin
Source:
RSC advances 2014 v.4 no.42 pp. 21909-21917
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; catalysts; catalytic activity; cuprous oxide; electrochemistry; energy; gold; graphene; hydrazine; iron oxides; nanogold; nanoparticles; oxidation; platinum; reducing agents; sodium borohydride; solvents; zinc oxide;     Show all 18 Subjects
Abstract:
... Graphene-based sheets that possess a unique nanostructure and a variety of fascinating properties are appealing as promising nanoscale building blocks of new composites. Herein, we present a general and effective approach for the preparation of metal oxide–graphene (metal oxide–G, metal oxide = Fe₃O₄, ZnO and Cu₂O) by in situ nucleation and growth of metal oxide on the surface of graphene in tetra ...
DOI:
10.1039/c4ra03184a

8. Enzymes as bionanoreactors: glucose oxidase for the synthesis of catalytic Au nanoparticles and Au nanoparticle–polyaniline nanocomposites

Author:
Sharma, Bhagwati; Mandani, Sonam; Sarma, Tridib K.
Source:
Journal of materials chemistry B 2014 v.2 no.26 pp. 4072-4079
ISSN:
2050-7518
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; ambient temperature; biocompatible materials; catalysts; catalytic activity; circular dichroism spectroscopy; energy; fluorescence emission spectroscopy; glucose; glucose oxidase; gold; hydrogen peroxide; manufacturing; nanocomposites; nanogold; nanoparticles; oxidants; oxidation; pH; polyaniline; reducing agents; sodium borohydride; synthesis;     Show all 24 Subjects
Abstract:
... The use of biomaterials such as enzymes for the synthesis of functional materials is important because such biologically guided processes can significantly reduce energy consumption in manufacturing processes. Glucose oxidase (GOx) has been exploited as a reducing as well as a stabilising agent for the green chemical synthesis of Au nanoparticles at pH 7.0 under ambient conditions. The synthesized ...
DOI:
10.1039/c4tb00218k

9. In situ synthesis of ultra-small platinum nanoparticles using a water soluble polyphenolic polymer with high catalytic activity

Author:
Maji, Tanmoy; Banerjee, Sanjib; Biswas, Mrinmoy; Mandal, Tarun K.
Source:
RSC advances 2014 v.4 no.93 pp. 51745-51753
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; activation energy; ambient temperature; borohydrides; catalysts; catalytic activity; hydrogenation; methanol; nanoparticles; nitrobenzenes; phenol; platinum; polymers; reducing agents; stabilizers; styrene; transmission electron microscopy; water solubility;     Show all 18 Subjects
Abstract:
... A simple and convenient strategy is described for the in situ synthesis of ultra-small platinum nanoparticles (Pt NPs) at room temperature using poly(4-vinyl phenol) (PVPh) as both the reducing as well as the stabilizing agent in aqueous alkaline solution. This strategy excludes the use of any additional stabilizing agent in addition to use of a reducing agent. Transmission electron microscopic an ...
DOI:
10.1039/c4ra08900f

10. Rapid hydrogenation: perfect quasi architecture (Ag@SiO₂NPs) as a substrate for nitrophenol reduction

Author:
Ramalingam, Sathya; Devi, Loganathan Bhavani; Raghava Rao, Jonnalagadda; Unni Nair, Balachandran
Source:
RSC advances 2014 v.4 no.99 pp. 56041-56051
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; absorbance; additives; catalysts; catalytic activity; dendrimers; electron transfer; geometry; hydrogenation; light scattering; nanoparticles; nanosilver; reducing agents; silica; silver; sodium borohydride; thermal stability; thermogravimetry; transmission electron microscopy;     Show all 20 Subjects
Abstract:
... Spherical nanoparticles with core-frame architecture are a viable route to combine multiple functionalities on a nanoscopic scale. Amongst these nanoparticles, metal polymeric hybrid nanostructures exhibit significantly enhanced stability. Synergistic catalytic responses arise from quasi perfect morphology and their unique interactions between the metal and reactant substrate. Core-frame silver su ...
DOI:
10.1039/c4ra08885a

11. Gold-supported magnetically recyclable nanocatalysts: a sustainable solution for the reduction of 4-nitrophenol in water

Author:
Rocha, Mariana; Fernandes, Carlos; Pereira, Clara; Rebelo, Susana L. H.; Pereira, Manuel F. R.; Freire, Cristina
Source:
RSC advances 2014 v.5 no.7 pp. 5131-5141
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; ambient temperature; aminophenols; catalysts; catalytic activity; crystal structure; dyes; ferrimagnetic materials; gold; leaching; magnetic properties; magnetic separation; magnetism; manganese; nanogold; nanoparticles; nitrogen; pesticides; porous media; reducing agents; sodium borohydride; thiols; transmission electron microscopy; ultraviolet-visible spectroscopy; wastewater;     Show all 28 Subjects
Abstract:
... In this work mesoporous silica-coated manganese(ii) ferrite (MnFe₂O₄) magnetic nanoparticles functionalized with amine and thiol groups were prepared and used as supports for the in situ immobilization of gold nanoparticles (Au NPs). The resulting Au-supported magnetic nanocatalysts, denoted as Mn@SiO₂_NH₂@Au and Mn@SiO₂_SH@Au, were tested in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol ...
DOI:
10.1039/c4ra15865b

12. One-pot synthesis of an Au/Au₂S viologen hybrid nanocomposite for efficient catalytic applications

Author:
Gadgil, Bhushan; Damlin, Pia; Viinikanoja, Antti; Heinonen, Markku; Kvarnström, Carita
Source:
Journal of materials chemistry A 2015 v.3 no.18 pp. 9731-9737
ISSN:
2050-7496
Subject:
p-nitrophenol,   etc   ; adsorption; aminophenols; catalysts; catalytic activity; dithionite; electrochemistry; electron transfer; gold; microscopy; nanocomposites; nanogold; nanoparticles; polymers; reducing agents; spectroscopy; stabilizers; sulfides; synthesis;     Show all 19 Subjects
Abstract:
... We report a facile one-pot synthesis of Au/Au₂S multicomponent nanoparticles supported on viologen (V) as a hybrid nanocomposite. Sodium dithionite was used as the reducing agent for both Au and V precursors and SDS as the stabilizing agent for Au nanoparticles in aqueous reaction medium. Spectroscopy, microscopy and electrochemical measurements confirm the successful composite formation. The as-p ...
DOI:
10.1039/c5ta01372k

13. Graphdiyne Oxides as Excellent Substrate for Electroless Deposition of Pd Clusters with High Catalytic Activity

Author:
Qi, Hetong; Yu, Ping; Wang, Yuexiang; Han, Guangchao; Liu, Huibiao; Yi, Yuanping; Li, Yuliang; Mao, Lanqun
Source:
Journal of the American Chemical Society 2015 v.137 no.16 pp. 5260-5263
ISSN:
1520-5126
Subject:
p-nitrophenol,   etc   ; carbon; catalysts; catalytic activity; nanocomposites; nanoparticles; oxidation; oxides; reducing agents;     Show all 9 Subjects
Abstract:
... Graphdiyne (GDY), a novel kind of two-dimensional carbon allotrope consisting of sp- and sp²-hybridized carbon atoms, is found to be able to serve as the reducing agent and stabilizer for electroless deposition of highly dispersed Pd nanoparticles owing to its low reduction potential and highly conjugated electronic structure. Furthermore, we observe that graphdiyne oxide (GDYO), the oxidation for ...
DOI:
10.1021/ja5131337

14. Reductant and Sequence Effects on the Morphology and Catalytic Activity of Peptide-Capped Au Nanoparticles

Author:
Briggs, Beverly D.; Li, Yue; Swihart, Mark T.; Knecht, Marc R.
Source:
ACS Applied Materials & Interfaces 2015 v.7 no.16 pp. 8843-8851
ISSN:
1944-8252
Subject:
p-nitrophenol,   etc   ; activation energy; ascorbic acid; catalysts; catalytic activity; gold; hydrazine; ligands; nanogold; nanoparticles; peptides; reducing agents;     Show all 12 Subjects
Abstract:
... The use of peptides as capping ligands for materials synthesis has been widely explored. The ambient conditions of bio-inspired syntheses using molecules such as peptides represent an attractive route for controlling the morphology and activity of nanomaterials. Although various reductants can be used in such syntheses, no comprehensive comparison of the same bio-based ligand with different reduct ...
DOI:
10.1021/acsami.5b01461

15. A simple way to prepare Pd/Fe3O4/polypyrrole hollow capsules and their applications in catalysis

Author:
Yao, Tongjie; Zuo, Quan; Wang, Hao; Wu, Jie; Xin, Baifu; Cui, Fang; Cui, Tieyu
Source:
Journal of colloid and interface science 2015 v.450 pp. 366-373
ISSN:
0021-9797
Subject:
p-nitrophenol,   etc   ; borohydrides; catalysts; catalytic activity; equations; iron oxides; magnetic materials; magnetic separation; magnetism; nanoparticles; nanospheres; nitric acid; polystyrenes; pyrroles; reducing agents; tetrahydrofuran;     Show all 16 Subjects
Abstract:
... Preparation of catalysts with good catalytic activity and high stability, together with magnetic separation property, in a simple way is highly desirable. In this paper, we reported a novel strategy to construct magnetic recyclable hollow capsules with Pd and Fe3O4 nanoparticles embedded in polypyrrole (PPy) shell via only two steps: first, synthesization of Pd nanoparticles, preparation of Fe3O4 ...
DOI:
10.1016/j.jcis.2015.03.012

16. Using the M13 Phage as a Biotemplate to Create Mesoporous Structures Decorated with Gold and Platinum Nanoparticles

Author:
Vera-Robles, L. Irais; González-Gracida, Jaqueline; Hernández-Gordillo, Armin; Campero, Antonio
Source:
Langmuir 2015 v.31 no.33 pp. 9188-9197
ISSN:
1520-5827
Subject:
p-nitrophenol,   etc   ; coat proteins; gold; nanogold; platinum; silica; methylene blue; catalysts; bacteriophages; physicochemical properties; reducing agents; porous media; synthesis; nanoparticles; catalytic activity; thiols; metal ions;     Show all 17 Subjects
Abstract:
... By taking advantage of the physical and chemical properties of the M13 bacteriophage, we have used this virus to synthesize mesoporous silica structures. Major coat protein p8 was chemically modified by attaching thiol groups. As we show, the resulting thiolated phage can be used as a biotemplate able to direct the formation of mesoporous silica materials. Simultaneously, this thiol functionality ...
DOI:
10.1021/acs.langmuir.5b01741

17. Green synthesis of CuO nanoparticles by aqueous extract of Gundelia tournefortii and evaluation of their catalytic activity for the synthesis of N-monosubstituted ureas and reduction of 4-nitrophenol

Author:
Nasrollahzadeh, Mahmoud; Maham, Mehdi; Mohammad Sajadi, S.
Source:
Journal of colloid and interface science 2015 v.455 pp. 245-253
ISSN:
0021-9797
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; Gundelia tournefortii; X-ray diffraction; catalysts; catalytic activity; cupric oxide; cyanamides; energy-dispersive X-ray analysis; ethanol; nanoparticles; protocols; reducing agents; scanning electron microscopy; solvents; transmission electron microscopy; ultraviolet-visible spectroscopy;     Show all 17 Subjects
Abstract:
... A facile, efficient and environmentally-friendly protocol has been developed for the green synthesis of CuO nanoparticles (NPs) by aqueous extract of Gundelia tournefortii as a mild, renewable and non-toxic reducing agent. CuO NPs were characterized by SEM, TEM, XRD, EDS, FT-IR and UV–vis spectroscopy. More importantly, the green synthesized CuO NPs presented excellent catalytic activity for reduc ...
DOI:
10.1016/j.jcis.2015.05.045

18. Spatially-controlled growth of platinum on gold nanorods with tailoring plasmonic and catalytic properties

Author:
Rong, Yun; Dandapat, Anirban; Huang, Youju; Sasson, Yoel; Zhang, Lei; Dai, Liwei; Zhang, Jiawei; Guo, Zhiyong; Chen, Tao
Source:
RSC advances 2016 v.6 no.13 pp. 10713-10718
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; catalysts; catalytic activity; gold; hydrophilicity; nanogold; nanoparticles; nanorods; platinum; reducing agents; sodium borohydride; surface plasmon resonance; thermoplastics;     Show all 13 Subjects
Abstract:
... We describe the synthesis of bimetallic dendritic platinum decorated gold nanorods (AuNRs) by the spatial control of Pt growth over gold nanorods using a heterogeneous seed-mediated growth method. The amounts of the Au seed and Pt-precursor were changed to achieve a tunable volume fraction of Pt coverage on the Au NRs surface. Pt nanostructures were spatially separated from each other, which was h ...
DOI:
10.1039/c5ra23175b

19. A simple way to prepare reduced graphene oxide nanosheets/Fe2O3-Pd/N-doped carbon nanosheets and their application in catalysis

Author:
Yao, Tongjie; Zhang, Junshuai; Zuo, Quan; Wang, Hao; Wu, Jie; Zhang, Xiao; Cui, Tieyu
Source:
Journal of colloid and interface science 2016 v.468 pp. 62-69
ISSN:
0021-9797
Subject:
p-nitrophenol,   etc   ; carbon; carbonization; catalysts; catalytic activity; ferric oxide; graphene oxide; heat treatment; maghemite; magnetic materials; magnetism; nanoparticles; nanosheets; oxidants; pyrroles; redox reactions; reducing agents;     Show all 17 Subjects
Abstract:
... The catalysts with Pd and γ-Fe2O3 nanoparticles embedded between reduced graphene oxide nanosheets (rGS) and N-doped carbon nanosheets (NCS) were prepared through a two-step method. Firstly, graphene oxide nanosheets (GS)/prussian blue (PB)-Pd/polypyrrole (PPy) composites were synthesized by using pyrrole monomer as reductant, K3Fe(CN)6 and PdCl2 as oxidants in the presence of GS via a redox react ...
DOI:
10.1016/j.jcis.2016.01.027

20. Capping agent-free highly dispersed noble metal nanoparticles supported in ordered mesoporous carbon with short channels and their catalytic applications

Author:
Gao, Wenjun; Li, Siwen; Pal, Manas; Liu, Yong; Wan, Xiaoyue; Li, Wei; Wang, Shuai; Wang, Changyao; Zheng, Gengfeng; Zhao, Dongyuan
Source:
RSC advances 2016 v.6 no.66 pp. 61064-61072
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; benzoic acid; benzyl alcohol; carbon; catalysts; catalytic activity; gold; hot water treatment; models; nanogold; nanoparticles; nanospheres; oxidation; oxygen; platinum; porous media; reducing agents;     Show all 17 Subjects
Abstract:
... Homogeneously dispersed small noble metal nanoparticles such as Pt and Au supported on ordered mesoporous carbon nanospheres have been successfully synthesized via a facile hydrothermal method without using any capping agent and further post-treated with reducing agent. The average sizes of the Pt and Au nanoparticles are estimated to be ∼1.7 and ∼5 nm. The small size of the nanoparticles and shor ...
DOI:
10.1039/c6ra10636f

21. Catalytic and peroxidase-like activity of carbon based-AuPd bimetallic nanocomposite produced using carbon dots as the reductant

Author:
Yang, Liuqing; Liu, Xiaoying; Lu, Qiujun; Huang, Na; Liu, Meiling; Zhang, Youyu; Yao, Shouzhuo
Source:
Analytica chimica acta 2016 v.930 pp. 23-30
ISSN:
0003-2670
Subject:
p-nitrophenol,   etc   ; X-ray photoelectron spectroscopy; analytical chemistry; carbon; catalysts; catalytic activity; colorimetry; detection limit; gold; hydrogen peroxide; nanocomposites; nanogold; nanoparticles; palladium; reducing agents; transmission electron microscopy;     Show all 16 Subjects
Abstract:
... In this report, carbon-based AuPd bimetallic nanocomposite (AuPd/C NC) was synthesized using carbon dots (C-dots) as the reducing agent and stabilizer by a simple green sequential reduction strategy, without adding other agents. The as synthesized AuPd/C NC showed good catalytic activity and peroxidase-like property. The structure and morphology of these nanoparticles were clearly characterized by ...
DOI:
10.1016/j.aca.2016.04.041

22. One-step preparation of Fe3O4/Pd@polypyrrole composites with enhanced catalytic activity and stability

Author:
Zhang, Hui; Liu, Yang; Wu, Jie; Xin, Baifu
Source:
Journal of colloid and interface science 2016 v.476 pp. 214-221
ISSN:
0021-9797
Subject:
p-nitrophenol,   etc   ; borohydrides; catalysts; catalytic activity; ions; iron oxides; magnetic separation; nanoparticles; nanospheres; palladium; reducing agents;     Show all 11 Subjects
Abstract:
... Core/shell Fe3O4/Pd@polypyrrole (PPy) composites with a Fe3O4 core and a PPy shell embedding Pd nanoparticles were prepared in one-step. The diameter of highly dispersed Pd nanoparticles was as small as 2.9nm owing to coordination interaction generated between Pd²⁺ ions and amino groups on PPy chains. The outer PPy shell was only 6.8nm: on one hand, the coverage was beneficial to improving the sta ...
DOI:
10.1016/j.jcis.2016.05.028

23. Synthesis of catalytically active gold clusters on the surface of Fe₃O₄@SiO₂ nanoparticles

Author:
Alonso-Cristobal, Paulino; Lopez-Quintela, M. Arturo; Contreras-Caceres, Rafael; Lopez-Cabarcos, Enrique; Rubio-Retama, Jorge; Laurenti, Marco
Source:
RSC advances 2016 v.6 no.102 pp. 100614-100622
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; aminophenols; catalysts; catalytic activity; gold; magnetism; nanogold; nanoparticles; porphyrins; reducing agents; silica; sodium borohydride; water solubility;     Show all 13 Subjects
Abstract:
... This work proposes a novel method to obtain catalytically active gold clusters by using the water-soluble 5,10,15,20-Tetrakis(4-trimethyl-ammonio-phenyl)porphyrin under mild conditions instead of using strong reducing agents. Uniform gold clusters were obtained with a diameter comprised between 1 and 2 nm and long-term stability. Furthermore, the water-soluble porphyrin was immobilized on the SiO₂ ...
DOI:
10.1039/c6ra20055a

24. Development of highly efficient Cu versus Pd catalysts supported on graphitic carbon materials for the reduction of 4-nitrophenol to 4-aminophenol at room temperature

Author:
Morales, M.V.; Rocha, M.; Freire, C.; Asedegbega-Nieto, E.; Gallegos-Suarez, E.; Rodríguez-Ramos, I.; Guerrero-Ruiz, A.
Source:
Carbon 2017 v.111 pp. 150-161
ISSN:
0008-6223
Subject:
p-nitrophenol,   etc   ; ambient temperature; aminophenols; catalysts; catalytic activity; copper; graphene; hydrogen; nanoparticles; palladium; particle size; reducing agents; surface area;     Show all 13 Subjects
Abstract:
... In this work we report a simple procedure for synthesis of Cu and Pd catalysts supported on high surface area graphite (HSAG) by wetness impregnation technique, and further generation of metal nanoparticles using NaBH4 as reducing agent. The catalysts have been tested in the reduction of 4-nitrophenol to 4-aminophenol, at room temperature, in presence of NaBH4 as hydrogen source. Both Cu and Pd ca ...
DOI:
10.1016/j.carbon.2016.09.079

25. In Situ Growth of Clean Pd Nanoparticles on Polystyrene Microspheres Assisted by Functional Reduced Graphene Oxide and Their Excellent Catalytic Properties

Author:
Ni, Xinjiong; Wu, Zhengfeng; Gu, Xiaodan; Wang, Dawei; Yang, Cheng; Sun, Peidong; Li, Yunxing
Source:
Langmuir 2017 v.33 no.33 pp. 8157-8164
ISSN:
1520-5827
Subject:
p-nitrophenol,   etc   ; catalysts; catalytic activity; centrifugation; graphene oxide; hydrophobic bonding; microparticles; nanoparticles; palladium; polystyrenes; redox reactions; reducing agents; stabilizers; synergism;     Show all 14 Subjects
Abstract:
... Herein an in situ growth of clean palladium nanoparticles (Pd NPs) on functional reduced graphene oxide (RGO)-coated polystyrene (PS) microspheres is achieved by a simple two-step process. On the basis of the hydrophobic interaction and π-electron interaction, the PS/RGO composite particles are first prepared by the reduction of graphene oxide in the presence of PS microspheres. Second, without us ...
DOI:
10.1021/acs.langmuir.7b01214

26. Room-Temperature Turkevich Method: Formation of Gold Nanoparticles at the Speed of Mixing Using Cyclic Oxocarbon Reducing Agents C

Author:
Larm, Nathaniel E.; Essner, Jeremy B.; Pokpas, Keagan; Canon, James A.; Jahed, Nazeem; Iwuoha, Emmanuel I.; Baker, Gary A.
Source:
Journal of physical chemistry 2018 v.122 no.9 pp. 5105-5118
ISSN:
1932-7455
Subject:
p-nitrophenol,   etc   ; ambient temperature; aqueous solutions; ascorbic acid; boiling; catalysts; catalytic activity; citrates; environmental impact; gold; mixing; models; nanogold; nanoparticles; oxidation; reducing agents;     Show all 16 Subjects
Abstract:
... We demonstrate a facile and reproducible means of producing quasi-spherical, colloidally stable gold nanoparticles (AuNPs) on the basis of rapid room-temperature mixing of aqueous solutions of HAuCl₄ and a cyclic oxocarbon diacid (squaric acid, SA; croconic acid, CA; or rhodizonic acid, SR) or ascorbic acid (AA) as dual reducing and capping agent. Although these reducing agents generally produced ...
DOI:
10.1021/acs.jpcc.7b10536

27. Green synthesis of Pd nanoparticles supported on reduced graphene oxide, using the extract of Rosa canina fruit, and their use as recyclable and heterogeneous nanocatalysts for the degradation of dye pollutants in water

Author:
Hemmati, Saba; Mehrazin, Lida; Ghorban, Hedieh; Garakani, Samir Hossein; Mobaraki, Taha Hashemi; Mohammadi, Pourya; Veisi, Hojat
Source:
RSC advances 2018 v.8 no.37 pp. 21020-21028
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; Rosa canina; X-ray diffraction; ambient temperature; catalysts; catalytic activity; centrifugation; energy-dispersive X-ray analysis; fruit extracts; fruits; graphene oxide; methylene blue; nanoparticles; palladium; pollutants; reducing agents; rhodamines; scanning electron microscopy; stabilizers; surfactants; transmission electron microscopy; ultraviolet-visible spectroscopy; wastewater treatment;     Show all 23 Subjects
Abstract:
... The current study suggests a convenient synthesis of in situ, ecofriendly and well-dispersed palladium nanoparticles with narrow and small dimension distributions on a graphene oxide (GO) surface using a Rosa canina fruit extract as a stabilizer and reducing agent without the addition of any other stabilizers or surfactants. The as-synthesized nanocatalyst (Pd NPs/RGO) was assessed with XRD, UV-vi ...
DOI:
10.1039/c8ra03404d

28. PdCo nanoparticles supported on carbon fibers derived from cotton: Maximum utilization of Pd atoms for efficient reduction of nitroarenes

Author:
Yang, Jin; Wang, Wei David; Dong, Zhengping
Source:
Journal of colloid and interface science 2018 v.524 pp. 84-92
ISSN:
0021-9797
Subject:
p-nitrophenol,   etc   ; active sites; aqueous solutions; borohydrides; carbon fibers; catalysts; catalytic activity; cobalt; cotton; formaldehyde; leaching; magnetism; nanoparticles; palladium; pyrolysis; reducing agents; temperature; toxicity;     Show all 18 Subjects
Abstract:
... In the present work, a facile and environment-friendly route is illustrated for the efficient fabrication of highly dispersed PdCo nanoparticles (NPs) by modified cotton-derived carbon fibers (PdCo/CCF). Firstly, commercial cotton was impregnated with CoCl2, followed by pyrolysis under high calcination temperature to obtain the Co NPs modified CCF sample (Co/CCF). Secondly, Co/CCF was treated with ...
DOI:
10.1016/j.jcis.2018.04.008

29. Biosynthesized AgNP capped on novel nanocomposite 2-hydroxypropyl-β-cyclodextrin/alginate as a catalyst for degradation of pollutants

Author:
Nguyen, Thanh-Danh; Dang, Chi-Hien; Mai, Dinh-Tri
Source:
Carbohydrate polymers 2018 v.197 pp. 29-37
ISSN:
0144-8617
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; Jasminum; alginates; aqueous solutions; catalysts; catalytic activity; energy-dispersive X-ray analysis; gelation; industrial effluents; ions; leaves; methyl orange; nanocomposites; nanoparticles; nanosilver; reducing agents; rhodamines; silver; transmission electron microscopy; trapping; ultraviolet-visible spectroscopy; zeta potential;     Show all 23 Subjects
Abstract:
... This study presents an efficient and facile method for the trapping of Ag+ ions on hybrid nanocomposite based on 2-hydroxypropyl-β-cyclodextrin (HPCD) and alginate (Alg) in aqueous medium through ionotropic gelation mechanism and followed by in situ assembly of silver nanoparticles (AgNPs) using aqueous extract of Jasminum subtriplinerve leaves as a reducing agent. The nanocomposite AgNPs/HPCD/Alg ...
DOI:
10.1016/j.carbpol.2018.05.077

30. Facile fabrication of functionalized core-shell Fe3O4@SiO2@Pd microspheres by urea-assisted hydrothermal route and their application in the reduction of nitro compounds

Author:
Gil, J.C; Ferreira, L.F.; Silva, V.C.; Oliveira, A.C.; de Oliveira, R.R.; Jacinto, M.J.
Source:
Environmental nanotechnology, monitoring & management 2019 v.11 pp. 100220
ISSN:
2215-1532
Subject:
p-nitrophenol,   etc   ; catalysts; catalytic activity; hydrogen; hydrolysis; magnetism; magnetite; microparticles; nanoparticles; nitrates; pH; reducing agents; silica; sodium hydroxide; urea;     Show all 15 Subjects
Abstract:
... Fe3O4@SiO2 microspheres were fabricated by a simple urea-assisted hydrothermal route. The spheres have a diameter of about 400 nm containing a dense magnetic core (150 nm) composed of individual magnetite nanoparticles (12 nm). The material was functionalized with different organosilanes containing electron-donor groups (APTES and APTDS). The materials were further used to stabilize Pd nanoparticl ...
DOI:
10.1016/j.enmm.2019.100220

31. Temperature-Controlled Catalysis by Core–Shell–Satellite AuAg@pNIPAM@Ag Hybrid Microgels: A Highly Efficient Catalytic Thermoresponsive Nanoreactor

Author:
Tzounis, Lazaros; Doña, Manuel; Lopez-Romero, Juan Manuel; Fery, Andreas; Contreras-Caceres, Rafael
Source:
ACS applied materials & interfaces 2019 v.11 no.32 pp. 29360-29372
ISSN:
1944-8252
Subject:
p-nitrophenol,   etc   ; amines; aminophenols; catalysts; catalytic activity; colloids; electrons; encapsulation; energy-dispersive X-ray analysis; gold; hydrophilicity; light scattering; microgels; nanogold; nanoparticles; nanosilver; nitrogen; polymerization; reaction kinetics; reducing agents; satellites; silver; sodium borohydride; temperature; thermogravimetry; transmission electron microscopy; ultraviolet-visible spectroscopy;     Show all 27 Subjects
Abstract:
... A novel wet-chemical protocol is reported for the synthesis of “temperature-programmable” catalytic colloids consisting of bimetallic core@shell AuAg nanoparticles encapsulated into poly(N-isopropylacrylamide) (pNIPAM) microgels with silver satellites (AgSTs) incorporated within the microgel structure. Spherical AuNPs of 50 nm in diameter are initially synthesized and used for growing a pNIPAM mic ...
DOI:
10.1021/acsami.9b10773

32. Catalytic reduction of nitrophenols and dyes using silver nanoparticles @ cellulose polymer paper for the resolution of waste water treatment challenges

Author:
Albukhari, Soha M.; Ismail, Muhammad; Akhtar, Kalsoom; Danish, Ekram Y.
Source:
Colloids and surfaces 2019 v.577 pp. 548-561
ISSN:
0927-7757
Subject:
p-nitrophenol,   etc   ; Duranta erecta; X-ray diffraction; active sites; aquatic environment; catalysts; catalytic activity; cellulose; cellulose acetate; decontamination; drinking water; dyes; ecological balance; effluents; energy-dispersive X-ray analysis; fauna; flora; humans; leaves; methyl orange; models; nanocomposites; nanoparticles; nanosilver; nitroanilines; organic matter; paper; polymers; reducing agents; remediation; rhodamines; scanning electron microscopy; spectroscopy; surface area; titanium dioxide; toxicity; wastewater; wastewater treatment;     Show all 38 Subjects
Abstract:
... Environmental remediation of toxic organic pollutants on catalytic reduction has gained much attention. The discharge of untreated effluents into the aquatic environment leads to an unwanted change in ecological balance. Recently, effluents of organic dyes and nitroarenes have been identified as a new threat because the unwanted dyes and nitro compounds are toxic to fauna, flora, and humans. Effec ...
DOI:
10.1016/j.colsurfa.2019.05.058

33. A noble bimetal oxysulfide CuVOS catalyst for highly efficient catalytic reduction of 4-nitrophenol and organic dyes

Author:
Sun, Huizhi; Zelekew, Osman Ahmed; Chen, Xiaoyun; Guo, Yuanbo; Kuo, Dong-Hau; Lu, Qingxin; Lin, Jinguo
Source:
RSC advances 2019 v.9 no.55 pp. 31828-31839
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; catalysts; catalytic activity; chemical reduction; methyl orange; methylene blue; nanoparticles; nitrogen; reducing agents; scanning electron microscopy; sodium borohydride;     Show all 14 Subjects
Abstract:
... A novel copper–vanadium bimetallic oxysulfide (CuVOS) nanoparticle catalyst was successfully synthesized by a facile method. The samples were characterized by X-ray photoelectron spectrometry (XPS), X-ray diffractometry (XRD), field-emission scanning electron microscopy (FE-SEM), UV-Vis diffuse spectroscopy (DRS), Fourier transform infrared spectroscopy (FTIR), and N₂ adsorption–desorption isother ...
DOI:
10.1039/c9ra05172d

34. In situ reduction of chloroauric acid (HAuCl₄) for generation of catalytic Au nanoparticle embedded triazine based covalent organic polymer networks

Author:
Dursun, Sami; Yavuz, Emine; Çetinkaya, Zeynep
Source:
RSC advances 2019 v.9 no.66 pp. 38538-38546
ISSN:
2046-2069
Subject:
p-nitrophenol,   etc   ; Fourier transform infrared spectroscopy; X-ray diffraction; biocompatibility; catalysts; catalytic activity; drugs; gold; ions; nanogold; nanoparticles; nitroaromatic compounds; particle size; persistent organic pollutants; polymers; reducing agents; thermogravimetry; transmission electron microscopy; triazines; ultraviolet-visible spectroscopy;     Show all 20 Subjects
Abstract:
... Covalent-organic polymer networks (COPNs) have been used as catalyst supports due to their stable and favorable structure. Herein, a simple synthetic route was applied to generate Au@COPN-1 hybrids via in situ reduction of gold ions with no additional reducing agent. Synthesized novel COPN-1 was mixed with different concentrations of HAuCl₄ which resulted in Au@COPN-1 with varying sizes of Au nano ...
DOI:
10.1039/c9ra08822a

35. In situ growth of gold and silver nanoparticles onto phyto-functionalized boron nitride nanosheets: Catalytic, peroxidase mimicking, and antimicrobial activity

Author:
Deshmukh, Aarti R.; Aloui, Hajer; Kim, Beom Soo
Source:
Journal of cleaner production 2020 v.270 pp. 122339
ISSN:
0959-6526
Subject:
p-nitrophenol,   etc   ; Escherichia coli; Fourier transform infrared spectroscopy; Gram-negative bacteria; Staphylococcus aureus; X-ray diffraction; X-ray photoelectron spectroscopy; antibacterial properties; atomic force microscopy; bacterial growth; biosensors; boron nitride; catalysts; catalytic activity; energy-dispersive X-ray analysis; gold; human health; metal ions; moieties; nanocomposites; nanogold; nanohybrids; nanoparticles; nanosheets; nanosilver; peroxidase; polymers; polyphenols; reducing agents; salts; scanning electron microscopy; silver; thermogravimetry; transmission electron microscopy; ultrasonics; ultraviolet-visible spectroscopy;     Show all 36 Subjects
Abstract:
... This is the first report on a green and sustainable approach for the in situ growth of gold (Au) and silver (Ag) nanoparticles onto h-boron nitride nanosheets (BNNs) surface, through the use of gallnut extract (GNE) as a natural and potential reducing agent instead of chemical reductants, commonly reported for their harmful effects on the environment and human health. BNNs were synthesized by ultr ...
DOI:
10.1016/j.jclepro.2020.122339