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You searched for: Subject hydroxyl radicals Remove constraint Subject: hydroxyl radicals Subject carbon nanotubes Remove constraint Subject: carbon nanotubes Subject term catalysts Remove constraint Subject term: catalysts
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1. Activation of Persulfates by Graphitized Nanodiamonds for Removal of Organic Compounds

Author:
Lee Hongshin; Kim Hyoung-il; Weon Seunghyun; Choi Wonyong; Hwang Yu Sik; Seo Jiwon; Lee Changha; Kim Jae-Hong
Source:
Environmental Science & Technology 2016 v.50 no.18 pp. 10134-10142
ISSN:
1520-5851
Subject:
Fourier transform infrared spectroscopy; carbon nanotubes; catalysts; cost effectiveness; drugs; electron paramagnetic resonance spectroscopy; electron transfer; fullerene; graphene; hydroxyl radicals; nanodiamonds; organic matter; oxidants; oxidation; phenol; sulfates; thermogravimetry
Abstract:
... This study introduces graphited nanodiamond (G-ND) as an environmentally friendly, easy-to-regenerate, and cost-effective alternative catalyst to activate persulfate (i.e., peroxymonosulfate (PMS) and peroxydisulfate (PDS)) and oxidize organic compounds in water. The G-ND was found to be superior for persulfate activation to other benchmark carbon materials such as graphite, graphene, fullerene, a ...
DOI:
10.1021/acs.est.6b02079

2. Anchoring Fe₃O₄ Nanoparticles on Carbon Nanotubes for Microwave-Induced Catalytic Degradation of Antibiotics

Author:
Shiyuan Liu; Lefu Mei; Xiaoliang Liang; Libing Liao; Guocheng Lv; Shuaifei Ma; Shiyao Lu; Amr Abdelkader; Kai Xi
Source:
ACS applied materials & interfaces 2018 v.10 no.35 pp. 29467-29475
ISSN:
1944-8252
Subject:
absorption; carbon dioxide; carbon nanotubes; catalysts; chlortetracycline; free radicals; hydroxyl radicals; ion exchange chromatography; iron oxides; magnetism; mass spectrometry; microwave radiation; microwave treatment; nanoparticles; nitrates; oxidation; oxytetracycline; superoxide anion; water pollution
Abstract:
... Microwave-induced catalytic degradation is considered amongst the most efficient techniques to remove antibiotic such as chlortetracycline from contaminated water. Described here is a new microwave-induced oxidation catalyst based on carbon nanotubes (CNTs) decorated uniformly with nanoparticles of Fe₃O₄. The combination of dielectric loss and magnetic loss of the material contributed to its stron ...
DOI:
10.1021/acsami.8b08280

3. Carbon nanotubes-incorporated MIL-88B-Fe as highly efficient Fenton-like catalyst for degradation of organic pollutants

Author:
Hang Zhang; Shuo Chen; Haiguang Zhang; Xinfei Fan; Cong Gao; Hongtao Yu; Xie Quan
Source:
Frontiers of environmental science & engineering 2019 v.13 no.2 pp. 18
ISSN:
2095-2201
Subject:
X-ray photoelectron spectroscopy; carbon; carbon nanotubes; catalysts; catalytic activity; electron paramagnetic resonance spectroscopy; hydrogen peroxide; hydroxyl radicals; iron; moieties; pH; phenol; pollutants
Abstract:
... Iron-based metal organic frameworks have been verified to be efficient heterogeneous Fenton catalysts due to their open pore channels and highly uniform distribution of metallic centers. In these catalysts, however, the iron element is mainly in the form of Fe(III), which results in a process required to reduce Fe(III) to Fe(II) to initiate Fenton reaction. To address this problem, carbon nanotube ...
DOI:
10.1007/s11783-019-1101-z

4. Catalytic degradation of mefenamic acid by peroxymonosulfate activated with MWCNTs-CoFe2O4: influencing factors, degradation pathway, and comparison of activation processes

Author:
Maryam Mohammadi Amini; Nezamaddin Mengelizadeh
Source:
Environmental science and pollution research 2020 v.27 no.36 pp. 45324-45335
ISSN:
0944-1344
Subject:
carbon nanotubes; catalysts; catalytic activity; cobalt; ferrimagnetic materials; gas chromatography-mass spectrometry; heat; hydroxyl radicals; pH; pollution; research; sulfates; ultrasonics
Abstract:
... The cobalt ferrite loaded on multi-walled carbon nanotubes (MWCNTs-CoFe₂O₄) was synthesized and used as a novel catalyst for the degradation of mefenamic acid (MFA) in the presence of peroxymonosulfate (PMS). The results showed that MWCNTs-CoFe₂O₄ has higher catalytic performance in the activation of PMS and degradation of MFA compared with MWCNTs, Co²⁺, Fe²⁺, and CoFe₂O₄. The highest kinetic cons ...
DOI:
10.1007/s11356-020-10427-6

5. Catalytic ozonation of dimethyl phthalate using Fe₃O₄/multi-wall carbon nanotubes

Author:
Zhiyong Bai; Qi Yang; Jianlong Wang
Source:
Environmental technology 2017 v.38 no.16 pp. 2048-2057
ISSN:
1479-487X
Subject:
adsorption; aqueous solutions; carbon nanotubes; catalysts; dimethyl phthalate; environmental technology; hydrogen peroxide; hydroxyl radicals; iron; mineralization; organic acids and salts; ozonation; ozone; pH; phosphates
Abstract:
... In this paper, Fe₃O₄/multi-wall carbon nanotubes composites were prepared, characterized and used as a catalyst for enhancing the ozonation of dimethyl phthalate (DMP) in aqueous solution. The experimental results showed that DMP degradation and mineralization increased by 26% and 20%, respectively, in catalytic ozonation compared with single ozonation, and more H₂O₂ and organic acids were produce ...
DOI:
10.1080/09593330.2016.1245360

6. Catalytic wet peroxide oxidation of m‐cresol over novel Fe2O3 loaded microfibrous entrapped CNT composite catalyst in a fixed‐bed reactor

Author:
Yi Yang; Huiping Zhang; Ying Yan
Source:
Journal of chemical technology and biotechnology 2018 v.93 no.9 pp. 2552-2563
ISSN:
0268-2575
Subject:
ammonia; byproducts; carbon dioxide; carbon nanotubes; catalysts; catalytic activity; desorption; energy-dispersive X-ray analysis; ferric oxide; hydroxyl radicals; iron; leaching; macropores; nitrogen; organic acids and salts; oxidation; papermaking; porosimetry; scanning electron microscopy; stainless steel; temperature; vapors
Abstract:
... BACKGROUND: A novel iron‐loaded microfibrous entrapped carbon‐nanotube catalyst (Fe₂O₃‐MF‐CNT) was synthesized by wet lay‐up papermaking, sintering and metal organic chemical vapor deposition (MOCVD) processes. The catalysts were characterized by N₂ adsorption–desorption isotherm, mercury porosimetry, scanning electron microscopy (FE‐SEM), energy dispersive spectroscopy (EDS) and NH₃ temperature p ...
DOI:
10.1002/jctb.5609

7. Degradation of flumequine in aqueous solution by persulfate activated with common methods and polyhydroquinone-coated magnetite/multi-walled carbon nanotubes catalysts

Author:
Mingbao Feng; Ruijuan Qu; Xiaoling Zhang; Ping Sun; Yunxia Sui; Liansheng Wang; Zunyao Wang
Source:
Water research 2015 v.85 pp. 1-10
ISSN:
0043-1354
Subject:
antibiotics; aquatic organisms; aqueous solutions; bicarbonates; carbon; carbon nanotubes; catalysts; copper; dissolved organic matter; electron paramagnetic resonance spectroscopy; flumequine; heat; hydroxyl radicals; hydroxylation; inorganic ions; iron; municipal wastewater; oxidation; pH; sulfates; surface water
Abstract:
... In recent years, flumequine (FLU) has been ubiquitously detected in surface waters and municipal wastewaters. In light of its potential negative impacts to aquatic species, growing concern has been arisen for the removal of this antibiotic from natural waters. In this study, the kinetics, degradation mechanisms and pathways of aqueous FLU by persulfate (PS) oxidation were systematically determined ...
DOI:
10.1016/j.watres.2015.08.011

8. Disinfection mechanism of E. coli by CNT-TiO2 composites: Photocatalytic inactivation vs. physical separation

Author:
Yuta Shimizu; Mohamed Ateia; Manna Wang; Dion Awfa; Chihiro Yoshimura
Source:
Chemosphere 2019 v.235 pp. 1041-1049
ISSN:
0045-6535
Subject:
Escherichia coli; carbon; carbon nanotubes; catalysts; disinfection; hydroxyl radicals; magnetic properties; magnetism; models; nanocomposites; photocatalysis; solar radiation; surface area; titanium dioxide
Abstract:
... Magnetic carbon nanotube (MCNT) composites with titanium dioxide (TiO2) have an enhanced photocatalytic disinfection efficiency (i.e. higher disinfection rate) and better applicability (i.e. solar light applicability and catalyst separation using its magnetic property) than bare TiO2 and/or MCNT. However, the role and mechanism of MCNT in the disinfection process are still unclear. Therefore, this ...
DOI:
10.1016/j.chemosphere.2019.07.006

9. Electronic properties of carbon nanotubes linked covalently with iron phthalocyanine to determine the formation of high-valent iron intermediates or hydroxyl radicals

Author:
Jirun Hu; Hongya Liu; Lulin Wang; Nan Li; Tiefeng Xu; Wangyang Lu; Zhexin Zhu; Wenxing Chen
Source:
Carbon 2016 v.100 pp. 408-416
ISSN:
0008-6223
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; carbon; carbon nanotubes; catalysts; catalytic activity; chemical bonding; electron paramagnetic resonance spectroscopy; electron transfer; electrons; free radicals; hydroxyl radicals; iron
Abstract:
... Two different nanomaterial-based metallophthalocyanine catalysts were synthesized by immobilizing iron trinitrophthalocyanine with amino (FeMATNPc) covalently on multi-walled carbon nanotubes (MWCNTs) by deamination-synthesized MWCNTs-FeTNPc and on oxidized MWCNTs by amidation-synthesized MWCNTs–CONH–FeTNPc. The resulting hybrid structure was confirmed and characterized by X-ray photoelectron spec ...
DOI:
10.1016/j.carbon.2016.01.010

10. Enhanced activation of peroxymonosulfate by CNT-TiO2 under UV-light assistance for efficient degradation of organic pollutants

Author:
Xuemin Hao; Guanlong Wang; Shuo Chen; Hongtao Yu; Xie Quan
Source:
Frontiers of environmental science & engineering 2019 v.13 no.5 pp. 77
ISSN:
2095-2201
Subject:
carbon nanotubes; catalysts; cobalt oxide; electron paramagnetic resonance spectroscopy; electrons; hydroxyl radicals; irradiation; phenol; photocatalysis; pollutants; singlet oxygen; sulfates; titanium dioxide; ultraviolet radiation
Abstract:
... In this work, a UV-light assisted peroxymonosulfate (PMS) activation system was constructed with the composite catalyst of multi-walled carbon nanotubes (CNT) — titanium dioxide (TiO₂). Under the UV light irradiation, the photoinduced electrons generated from TiO₂ could be continuously transferred to CNT for the activation of PMS to improve the catalytic performance of organic pollutant degradatio ...
DOI:
10.1007/s11783-019-1161-0

11. Enhanced catalytic ozonation by highly dispersed CeO2 on carbon nanotubes for mineralization of organic pollutants

Author:
Jing Wang; Xie Quan; Shuo Chen; Hongtao Yu; Guobin Liu
Source:
Journal of hazardous materials 2019 v.368 pp. 621-629
ISSN:
0304-3894
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; carbon nanotubes; catalysts; catalytic activity; ceric oxide; electron paramagnetic resonance spectroscopy; free radicals; hydrogen; hydroxyl radicals; mass transfer; mineralization; oxidation; ozonation; ozone; persistent organic pollutants; phenol; scanning electron microscopes; scanning electron microscopy; synergism
Abstract:
... Heterogeneous catalytic ozonation, in which ozone is activated by various catalysts to produce reactive oxygen species (ROS), is an effective approach to degrade persistent organic pollutants in water. However, catalyst with high activity and good stability for catalytic ozonation still remains rare. In this work, a highly dispersed cerium oxide on oxidized carbon nanotubes (CeO2-OCNT) were prepar ...
DOI:
10.1016/j.jhazmat.2019.01.095

12. Fe3O4/multi-walled carbon nanotubes as an efficient catalyst for catalytic ozonation of p-hydroxybenzoic acid

Author:
Z. Y. Bai; Q. Yang; J. L. Wang
Source:
International journal of environmental science and technology 2016 v.13 no.2 pp. 483-492
ISSN:
1735-1472
Subject:
4-hydroxybenzoic acid; Fourier transform infrared spectroscopy; X-ray diffraction; bicarbonates; carbon; carbon nanotubes; catalysts; hydroxyl radicals; iron oxides; mineralization; ozonation; ozone; pH; pollutants; scanning electron microscopes; transmission electron microscopy
Abstract:
... Fe₃O₄/multi-walled carbon nanotubes were prepared, characterized and used as a nanocatalyst for ozonation of p-hydroxybenzoic acid. The stability and reusability of the catalyst was evaluated. Characterization techniques including X-ray diffraction, Fourier transform infrared absorption spectroscopy, scanning electron microscope, high-resolution transmission electron microscopy and physical proper ...
DOI:
10.1007/s13762-015-0881-3

13. FeOx/MnOy modified oxidized carbon nanotubes as peroxymonosulfate activator for organic pollutants degradation

Author:
Xue Tian; Ling Xiao
Source:
Journal of colloid and interface science 2020 v.580 pp. 803-813
ISSN:
0021-9797
Subject:
X-ray photoelectron spectroscopy; ambient temperature; carbon nanotubes; catalysts; catalytic activity; deuterium oxide; encapsulation; free radicals; hydroxyl radicals; iron; manganese; manganese oxides; nitric acid; oxidation; pH; pollutants; rhodamines; superoxide anion
Abstract:
... In this work, the FeOₓ/MnOy decorated oxidized carbon nanotubes (CNTs-Fe-Mn) composites were synthesized and used as catalysts to activate peroxymonosulfate (PMS) for organic pollutants degradation. The catalytic ability of the CNTs-Fe-Mn catalyst was strongly correlated with the oxidation of CNTs and the molar ratio of Fe/Mn. When the CNTs was oxidized by 30 wt% HNO₃ and the modified molar ratio ...
DOI:
10.1016/j.jcis.2020.07.081

14. Green Sulfonation of Carbon Catalysts via Gas–Liquid Interfacial Plasma for Cellulose Hydrolysis

Author:
Lusha Qin; Takahiro Ishizaki; Nozomi Takeuchi; Katsuyuki Takahashi; Kwang Ho Kim; Oi Lun Li
Source:
ACS sustainable chemistry & engineering 2020 v.8 no.15 pp. 5837-5846
ISSN:
2168-0485
Subject:
activated carbon; biomass; carbon nanotubes; catalysts; catalytic activity; cellulose; chlorsulfuron; electrons; graphene oxide; hot water treatment; hydrolysis; hydroxyl radicals; sulfonic acids; sulfuric acid
Abstract:
... Sulfonated carbon catalysts exhibit excellent catalytic performance for biomass transformation, yet most currently used sulfonation approaches still rely on concentrated sulfuric acid or chlorsulfuron acid and harsh reaction conditions. Herein, we investigate a “green” sulfonation system via a novel gas–liquid interfacial plasma (GLIP) process conducted in 1 M H₂SO₄ at 25 °C for carbon materials w ...
DOI:
10.1021/acssuschemeng.9b07156

15. Heterogeneous catalytic ozonation of ciprofloxacin in water with carbon nanotube supported manganese oxides as catalyst

Author:
Minghao Sui; Sichu Xing; Li Sheng; Shuhang Huang; Hongguang Guo
Source:
Journal of hazardous materials 2012 v.227-228 no. pp. 227-236
ISSN:
0304-3894
Subject:
Escherichia coli; antibacterial properties; carbon; carbon nanotubes; catalysts; catalytic activity; ciprofloxacin; drinking water; electron paramagnetic resonance spectroscopy; hydroxyl radicals; manganese oxides; mineralization; ozonation; ozone; pH; wastewater
Abstract:
... Carbon nanotube-supported manganese oxides (MnOx/MWCNT) were used as catalysts to assist ozone in degrading ciprofloxacin in water. Manganese oxides were successfully loaded on multi-walled carbon nanotube surfaces by simply impregnating the carbon nanotube with permanganate solution. The catalytic activities of MnOx/MWCNT in ciprofloxacin ozonation, including degradation, mineralization effective ...
DOI:
10.1016/j.jhazmat.2012.05.039

16. Hydroxyl Radical-Dominated Catalytic Oxidation in Neutral Condition by Axially Coordinated Iron Phthalocyanine on Mercapto-Functionalized Carbon Nanotubes

Author:
Dongjing Ni; Jinfei Zhang; Xiyi Wang; Dandan Qin; Nan Li; Wangyang Lu; Wenxing Chen
Source:
Industrial & engineering chemistry process design and development 2017 v.56 no.11 pp. 2899-2907
ISSN:
1520-5045
Subject:
4-aminopyridine; 4-chlorophenol; biomimetics; carbon nanotubes; catalysts; catalytic activity; durability; dyes; electron paramagnetic resonance spectroscopy; electrons; hydrogen peroxide; hydroxyl radicals; iron; ligands; oxidation; pH; peroxidase; pollutants; porphyrins; process design
Abstract:
... The ligands and protein surroundings are important in peroxidase processes with iron porphyrins as catalysts. Similarly, two bioinspired composite catalysts made from iron phthalocyanine with axial ligands, 4-aminopyridine and 2-aminoethanethiol, were anchored on multiwalled carbon nanotubes to degrade some pollutants to the water environment, such as 4-chlorophenol, dyes, and so on. The effect of ...
DOI:
10.1021/acs.iecr.6b04726

17. Impact of Edge Oxidation State on Red-Ox Barriers during Hydrocarbon Oxydehydrogenation over Carbon Nanotube Catalysts: A Theoretical Study

Author:
Khavryuchenko Oleksiy V.; Frank Benjamin
Source:
The Journal of Physical Chemistry C 2017 v.121 no.7 pp. 3958-3962
ISSN:
1932-7455
Subject:
X-ray photoelectron spectroscopy; carbon nanotubes; catalysts; dehydrogenation; hydrocarbons; hydrogen peroxide; hydroxyl radicals; models; moieties; oxidation; oxygen
Abstract:
... A computational investigation of the oxidative dehydrogenation (ODH) of hydrocarbons over model edge-oxidized carbon nanotubes (CNTs) providing different degrees of CO/C–OH surface termination (i.e., reduction) was performed. The pool of gaseous species is assumed to contain the initial reagents (hydrocarbons, O₂) and volatile intermediates (R•, HO₂•, HO•, H₂O₂). The barriers of both the H-abstra ...
DOI:
10.1021/acs.jpcc.7b00068

18. Insights into the removal of terbuthylazine from aqueous solution by several treatment methods

Author:
Pedro M. Álvarez; Diego H. Quiñones; Isidro Terrones; Ana Rey; Fernando J. Beltrán
Source:
Water research 2016 v.98 pp. 334-343
ISSN:
0043-1354
Subject:
activated carbon; adsorption; aqueous solutions; atrazine; carbon nanotubes; catalysts; hydrogen peroxide; hydroxyl radicals; nanoparticles; ozonation; ozone; pH; photocatalysis; photolysis; photooxidation; sorption isotherms; terbuthylazine; titanium dioxide; ultraviolet radiation
Abstract:
... This paper reports the removal of the s-triazine herbicide terbuthylazine (TBA) from aqueous solution by various treatment methods including adsorption onto activated carbon (AC) and multiwalled carbon nanotubes (MWCNT), UV254 photolysis, UV254/H2O2, single ozonation, O3/H2O2, catalytic ozonation (AC, MWCNT and TiO2 as catalysts) and some solar driven processes such as TiO2 photocatalytic oxidatio ...
DOI:
10.1016/j.watres.2016.04.026

19. Magnetic Fe3O4/multi-walled carbon nanotubes materials for a highly efficient depletion of diclofenac by catalytic wet peroxideoxidation

Author:
Ysabel Huaccallo; Silvia Álvarez-Torrellas; María Pilar Marín; María Victoria Gil; Marcos Larriba; Vicente Ismael Águeda; Gabriel Ovejero; Juan García
Source:
Environmental science and pollution research international 2019 v.26 no.22 pp. 22372-22388
ISSN:
0944-1344
Subject:
adsorption; carbon nanotubes; catalysts; catalytic activity; coprecipitation; diclofenac; ecotoxicology; free radicals; hospitals; hot water treatment; hydrogen peroxide; hydroxyl radicals; magnetism; magnetite; oxidation; pH; pollution control; response surface methodology; surface area; surface water; synergism; wastewater; wastewater treatment
Abstract:
... The aim of this work is to synthesize a magnetic magnetite/multi-walled carbon nanotube (Fe₃O₄/MWCNT) catalyst by a method combining co-precipitation and hydrothermal treatments for the efficient removal of diclofenac (DCF) by catalytic wet peroxide oxidation (CWPO). The support (MWCNTs) shows a moderate-large surface area and good adsorption capacity, leading to the improvement of the magnetite ( ...
DOI:
10.1007/s11356-019-05597-x

20. One-Pot Synthesis of Metal–Carbon Nanotubes Network Hybrids as Highly Efficient Catalysts for Oxygen Evolution Reaction of Water Splitting

Author:
Cheng Yi; Liu Chang; Cheng Hui-Ming; Jiang San Ping
Source:
ACS Applied Materials & Interfaces 2014 v.6 no.13 pp. 10089-10098
ISSN:
1944-8252
Subject:
carbon nanotubes; catalysts; electrochemistry; graphene; hydrogen production; hydroxyl radicals; nanoparticles; oxygen; oxygen production; potassium hydroxide; synthesis; vapors
Abstract:
... Oxygen evaluation reaction (OER) is the most important reaction in hydrogen production from water splitting. Here we developed metal–carbon nanotubes (M-CNTs) hybrids with high metal oxide catalyst loading synthesized by arc-discharge and chemical vapor deposition (CVD) methods as electrocatalysts for OER in alkaline solutions. The M-CNTs hybrids produced by arc-discharge (M-CNTs-Arc) and CVD (M-C ...
DOI:
10.1021/am500988p

21. Ozonation and Carbon-assisted Ozonation of Methylene Blue as Model Compound: Effect of Solution pH

Author:
Shuo Zhang; Dong Wang; Shasha Zhang; Xingwen Zhang; Pingping Fan
Source:
Procedia Environmental Sciences 2013 v.18 pp. 493-502
ISSN:
1878-0296
Subject:
carbon; carbon nanotubes; catalysts; decolorization; hydroxyl radicals; methylene blue; mineralization; models; oxidation; ozonation; ozone; pH; process control
Abstract:
... This work investigated the pH effect on ozonation and carbon-assisted ozonation processes, where methylene blue (MB) was employed as model compound. Kinetic study and quantitative description on reaction pathway, i.e. molecular ozone attack and hydroxyl radicals (HO) oxidation, were accomplished to evaluate the effect of pH on process control for ozonation. The HO reaction route for MB decolorizat ...
DOI:
10.1016/j.proenv.2013.04.066

22. Probing the interphase “HO zone” originated by carbon nanotube during catalytic ozonation

Author:
Shuo Zhang; Xie Quan; Jian-Feng Zheng; Dong Wang
Source:
Water research 2017 v.122 pp. 86-95
ISSN:
0043-1354
Subject:
active sites; carbon nanotubes; catalysts; catalytic activity; fluorescence microscopy; hydroxyl radicals; image analysis; longevity; oxidation; ozonation; ozone; perfluorooctane sulfonic acid; umbelliferones
Abstract:
... Carbon nanotube (CNT) is an attractive metal-free catalyst that can be explored in combination with ozone treatment. Using fluorescence microscopy image analysis, we investigated the production of hydroxyl radicals (HO) within the solid-liquid interphase for CNT-mediated catalytic ozonation. The visualized results suggest that HO was vastly generated via catalysis and accumulated within a surface ...
DOI:
10.1016/j.watres.2017.05.063

23. Self-Propelled Micromotors for Naked-Eye Detection of Phenylenediamines Isomers

Author:
Roberto María-Hormigos; Beatriz Jurado-Sánchez; Alberto Escarpa
Source:
Analytical chemistry 2018 v.90 no.16 pp. 9830-9837
ISSN:
1520-6882
Subject:
bubbles; carbon nanotubes; catalysts; colorimetry; detection limit; dimerization; fuels; hydrogen peroxide; hydroxyl radicals; isomers; magnetic properties; manganese dioxide; nanoparticles; oxygen
Abstract:
... Tubular micromotors composed of a hybrid single-wall carbon nanotube (SW)–Fe₂O₃ outer layer and powered by a MnO₂ catalyst are used for phenylenediamines isomers detection and discrimination. Catalytic decomposition of H₂O₂ as fuel results in the production of oxygen bubbles and hydroxyl radicals for phenylenediamines dimerization to produce colorful solutions in colorimetric assays. The combinati ...
DOI:
10.1021/acs.analchem.8b01860

24. Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction

Author:
Qi Zhiyuan; Xiao Chaoxian; Liu Cong; Goh Tian Wei; Zhou Lin; Maligal-Ganesh Raghu; Pei Yuchen; Li Xinle; Curtiss Larry A.; Huang Wenyu
Source:
Journal of the American Chemical Society 2017 v.139 no.13 pp. 4762-4768
ISSN:
1520-5126
Subject:
carbon nanotubes; catalysts; fuel cells; hydroxyl radicals; methanol; methodology; nanoparticles; oxidation; porous media; prediction; silica; temperature; zinc
Abstract:
... Atomically ordered intermetallic nanoparticles (iNPs) have sparked considerable interest in fuel cell applications by virtue of their exceptional electronic and structural properties. However, the synthesis of small iNPs in a controllable manner remains a formidable challenge because of the high temperature generally required in the formation of intermetallic phases. Here we report a general metho ...
DOI:
10.1021/jacs.6b12780

25. Synthesis of polyimide-modified carbon nanotubes as catalyst for organic pollutant degradation via production of singlet oxygen with peroxymonosulfate without light irradiation

Author:
Mingyu Wei; Xiaowen Shi; Ling Xiao; Haifei Zhang
Source:
Journal of hazardous materials 2020 v.382 pp. 120993
ISSN:
0304-3894
Subject:
acid orange 7; ambient temperature; aqueous solutions; carbon nanotubes; catalysts; catalytic activity; electron paramagnetic resonance spectroscopy; free radicals; hydroxyl radicals; irradiation; oxidation; pH; pollutants; recycling; remediation; singlet oxygen; sulfates
Abstract:
... Polyimide-modified carbon nanotubes (PI/CNTs) were synthesized via a solvent-free thermal method and used as a metal-free catalyst to activate peroxymonosulfate for organic contaminant degradation without light irradiation. The characterization results suggested that PI was loaded onto the surface of CNTs. The catalytic ability of the PI/CNTs was strongly correlated with the content of PI in the c ...
DOI:
10.1016/j.jhazmat.2019.120993

26. Template-free synthesis of graphene-like carbons as efficient carbocatalysts for selective oxidation of alkanes

Author:
Xiang Hu; Yuchuan Liu; Haitao Huang; Baobing Huang; Guoliang Chai; Zailai Xie
Source:
Green chemistry 2020 v.22 no.4 pp. 1291-1300
ISSN:
1463-9270
Subject:
acetophenones; alkanes; carbon; carbon nanotubes; carbon-hydrogen bond activation; carbonization; catalysts; catalytic activity; chemical bonding; chemical industry; density functional theory; ethylbenzene; green chemistry; guanine; hydroxyl radicals; nanosheets; oxidation; porosity; sulfates; synergism
Abstract:
... Selective oxidation of aromatic alkanes by C–H activation is one of the key reactions in organic synthesis and the chemical industry. Activation of C–H bonds to obtain high-value added products under mild conditions by using sustainable carbocatalysts is of particular interest. Herein, we report a sustainable, green and template-free strategy towards the fabrication of N-doped and N/S codoped carb ...
DOI:
10.1039/c9gc03781k

27. Towards effective design of active nanocarbon materials for integrating visible-light photocatalysis with ozonation

Author:
Jiadong Xiao; Yongbing Xie; Hongbin Cao; Yuxian Wang; Zhuang Guo; Yue Chen
Source:
Carbon 2016 v.107 pp. 658-666
ISSN:
0008-6223
Subject:
carbon nanotubes; carbon nitride; catalysts; decontamination; electron paramagnetic resonance spectroscopy; fullerene; graphene oxide; hydroxyl radicals; oxalic acid; ozonation; ozone; photocatalysis; titanium dioxide; tungsten oxide; water treatment
Abstract:
... We herein present systematic insights into the potential of a wide variety of dimension-structured nanocarbons in visible light-O3 integrated process for metal-free water decontamination. Single-walled carbon nanotube (SWCNT), multi-walled carbon nanotube (MWCNT), reduced graphene oxide (rGO) and fullerene (C60) demonstrated high activities in catalytic ozonation, while graphitic carbon nitride (g ...
DOI:
10.1016/j.carbon.2016.06.066

28. A carbon nanotube-confined iron modified cathode with prominent stability and activity for heterogeneous electro-Fenton reactions

Author:
Pei Su; Minghua Zhou; Gengbo Ren; Xiaoye Lu; Xuedong Du; Ge Song
Source:
Journal of materials chemistry A 2019 v.7 no.42 pp. 24408-24419
ISSN:
2050-7496
Subject:
carbon; carbon nanotubes; catalysts; catalytic activity; cathodes; hydrogen peroxide; hydroxyl radicals; iron; iron oxides; pH; phenol; pollutants
Abstract:
... Transition metal modified carbon materials as multifunctional cathodes for electro-Fenton (EF) reactions are supposed to be promising for generating H₂O₂in situ and catalyzing it to form hydroxyl radicals to degrade organic pollutants, but this process still faces the challenges of reduced heterogeneous catalyst activities and poor stabilities due to the continuous leaching of active metals. Herei ...
DOI:
10.1039/c9ta07491k

29. The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide

Author:
Rui S. Ribeiro; Adrián M.T. Silva; José L. Figueiredo; Joaquim L. Faria; Helder T. Gomes
Source:
Carbon 2013 v.62 no. pp. 97-108
ISSN:
0008-6223
Subject:
activated carbon; active sites; aqueous solutions; carbon nanotubes; catalysts; graphene; hydrogen peroxide; hydroxyl radicals; methanol; physicochemical properties; sulfur; sulfuric acid
Abstract:
... Carbon materials with different structural and chemical properties, namely activated carbons, carbon xerogels, carbon nanotubes, graphene oxide, graphite and glycerol-based carbon materials, were tested under different operating conditions for their ability to catalyse hydrogen peroxide (H₂O₂) decomposition in aqueous solutions. Activated carbons treated with concentrated sulphuric acid (ACS) are ...
DOI:
10.1016/j.carbon.2013.06.001