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1. Removal of Pb(ii) and Cd(ii) from wastewater using arginine cross-linked chitosan–carboxymethyl cellulose beads as green adsorbent

Author:
Ahmad, Mudasir; Ahmad, Suhail,   et al.   ; Manzoor, Kaiser; Ikram, Saiqa;     Show all 4 Authors
Source:
RSC advances 2019 v.9 no.14 pp. 7890-7902
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorbents; adsorption; arginine; cadmium; carboxymethylcellulose; chitosan; crosslinking; energy-dispersive X-ray analysis; ions; lead; pH; scanning electron microscopy; sorption isotherms; temperature; thermodynamic models; thermodynamics; thermogravimetry; wastewater
Abstract:
... A one pot approach has been explored to synthesize crosslinked beads from chitosan (CS) and carboxymethyl cellulose (CM) using arginine (ag) as a crosslinker. The synthesized beads were characterized by FTIR, SEM, EDX, XRD, TGA and XPS analysis. The results showed that CS and CM were crosslinked successfully and the obtained material (beads) was analyzed for adsorption of Cd(ii) and Pb(ii) by usin ...
DOI:
10.1039/c9ra00356h

2. Mechanism of atom economical conversion of alcohols and amines to amides using Fe(ii) pincer catalyst. An outer-sphere metal–ligand pathway or an inner-sphere elimination pathway?

Author:
Shiekh, Bilal Ahmad,   et al.   ; Kaur, Damanjit;     Show all 2 Author
Source:
RSC advances 2019 v.9 no.30 pp. 17479-17489
ISSN:
2046-2069
Subject:
alcohols; amides; amines; catalysts; catalytic activity; dehydrogenation; density functional theory; formaldehyde; iron; ligands; moieties; phosphine; reaction mechanisms
Abstract:
... In this present theoretical study, we investigated the reaction mechanism of atom-economical amide formation from alcohols and amines mediated by iron(ii) hydride complex (ⁱᴾʳPNP)Fe(H)(CO) (ⁱᴾʳPNP = N[CH₂CH₂(PiPr₂)]₂) using state-of-the-art density functional theory. Two scenarios of mechanistic pathways were considered, the inner-sphere and the outer-sphere pathways. In former case, the reaction ...
DOI:
10.1039/c9ra03309b

3. New transition metal complexes with a pendent indole ring: insights into the antifungal activity and mode of action

Author:
Dar, Ovas Ahmad; Lone, Shabir Ahmad; Malik, Manzoor Ahmad,   et al.   ; Wani, Mohmmad Younus; Ahmad, Aijaz; Hashmi, Athar Adil;     Show all 6 Authors
Source:
RSC advances 2019 v.9 no.27 pp. 15151-15157
ISSN:
2046-2069
Subject:
Candida albicans; antifungal properties; cobalt; copper; drug therapy; fluconazole; fungi; geometry; growth curves; ligands; mechanism of action; minimum inhibitory concentration; multiple drug resistance; nickel; schiff bases; tryptamine; zinc
Abstract:
... Development of new chemotherapeutic agents to treat multidrug-resistant fungal infections to augment the current treatment options is a must. In this direction, a series of mixed ligand complexes was synthesized from a Schiff base (L) obtained by the condensation of 2-hydroxynapthaldehyde and tryptamine, and 1,10-phenanthroline (1,10-phen) as a secondary ligand. Based on spectral characterization ...
DOI:
10.1039/c9ra02600b

4. Photoactive cotton fabric for UV protection and self-cleaning

Author:
Ahmad, Ishaq,   et al.   ; Kan, Chi-wai; Yao, Zhongping;     Show all 3 Authors
Source:
RSC advances 2019 v.9 no.32 pp. 18106-18114
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; absorption; coatings; cotton; cotton fabric; dyes; gels; light; nanomaterials; photocatalysis; rhodamines; scanning electron microscopy; stain removal; titanium dioxide; transmittance
Abstract:
... Development of textile materials with tailored properties by coating with nano-materials is an emerging field of research. The preparation and characterization of photoactive cotton fabric for UV protection and self-cleaning properties are reported herein. In this study, a photoactive sol comprising of a reactive blue dye, C.I. Reactive Blue 21 (RB-21), and TiO₂ was prepared by using sol gel metho ...
DOI:
10.1039/c9ra02023c

5. Microwave-assisted synthesis of glutathione-coated hollow zinc oxide for the removal of heavy metal ions from aqueous systems

Author:
Malik, Lateef Ahmad,   et al.   ; Bashir, Arshid; Manzoor, Taniya; Pandith, Altaf Hussain;     Show all 4 Authors
Source:
RSC advances 2019 v.9 no.28 pp. 15976-15985
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorption; cadmium; crystallography; density functional theory; differential thermal analysis; glutathione; heavy metals; lead; light scattering; mercury; metal ions; microwave treatment; pH; polystyrenes; scanning electron microscopy; solubility; thermogravimetry; toxicity; transmission electron microscopy; zeta potential; zinc oxide
Abstract:
... Glutathione has tremendous binding potential with metal ions present in water. However, the solubility of glutathione in water limits its productivity in the removal of these toxic ions from aqueous systems. The removability of heavy ions with glutathione and the associated adsorption capability are enhanced; for this purpose, glutathione is coated over hollow zinc oxide particles. Glutathione-coa ...
DOI:
10.1039/c9ra00243j

6. Investigation on the electronic structure, optical, elastic, mechanical, thermodynamic and thermoelectric properties of wide band gap semiconductor double perovskite Ba₂InTaO₆

Author:
Dar, Sajad Ahmad,   et al.   ; Sharma, Ramesh; Srivastava, Vipul; Sakalle, Umesh Kumar;     Show all 4 Authors
Source:
RSC advances 2019 v.9 no.17 pp. 9522-9532
ISSN:
2046-2069
Subject:
Poisson distribution; absorbance; anisotropy; density functional theory; dielectric properties; electrical conductivity; electrons; energy; heat; mechanical properties; modulus of elasticity; photons; refractive index; semiconductors
Abstract:
... In the present paper, double perovskite Ba₂InTaO₆ was investigated in terms of its structural, electronic, optical, elastic, mechanical, thermodynamic and thermoelectric properties using density-functional theory (DFT). The generalized gradient approximation (GGA) in the scheme of Perdew, Burke and Ernzerhof (PBE) and the modified Becke–Johnson (mBJ) potential were employed for the exchange–correl ...
DOI:
10.1039/c9ra00313d

7. Novel triangular silver nanoparticle modified membranes for enhanced antifouling performance

Author:
Ahmad, Jabran,   et al.   ; Wen, Xianghua; Li, Fengjuan; Wang, Bo;     Show all 4 Authors
Source:
RSC advances 2019 v.9 no.12 pp. 6733-6744
ISSN:
2046-2069
Subject:
X-ray photoelectron spectroscopy; anisotropy; antibacterial properties; biofouling; electrolytes; hydrophilicity; leaching; nanosilver; scanning electron microscopy; silver; transmission electron microscopy
Abstract:
... This study marks the first ever attempt at the successful fabrication of a novel reactive membrane to combat fouling through layer-by-layer (LBL) surface modification with polyelectrolyte (PE), followed by anisotropic triangular silver nanoparticles (TSNP). The morphology and the presence of TSNP on the membrane was confirmed by HR-TEM, FE-SEM and XPS. The charge density of the novel membrane (PE- ...
DOI:
10.1039/c8ra10540e

8. Designing indacenodithiophene based non-fullerene acceptors with a donor–acceptor combined bridge for organic solar cells

Author:
Bhatti, Ijaz Ahmad,   et al.   ; Ans, Muhammad; Ayub, Khurshid; Iqbal, Javed;     Show all 4 Authors
Source:
RSC advances 2019 v.9 no.7 pp. 3605-3617
ISSN:
2046-2069
Subject:
fullerene; solar cells; absorption; solvents; polymers; chloroform
Abstract:
... Non-fullerene small acceptor molecules have gained significant attention for application in organic solar cells owing to their advantages over fullerene based acceptors. Efforts are continuously being made to design novel acceptors with greater efficiencies. Here, optoelectronic properties of four novel acceptor–donor–acceptor (A–D–A) type small molecules (A1, A2, A3 and A4) were studied for their ...
DOI:
10.1039/c8ra09292c

9. Preparation of a novel curcumin nanoemulsion by ultrasonication and its comparative effects in wound healing and the treatment of inflammation

Author:
Ahmad, Niyaz; Ahmad, Rizwan,   et al.   ; Al-Qudaihi, Ali; Alaseel, Salman Edrees; Fita, Ibrahim Zuhair; Khalid, Mohammed Saifuddin; Pottoo, Faheem Hyder;     Show all 7 Authors
Source:
RSC advances 2019 v.9 no.35 pp. 20192-20206
ISSN:
2046-2069
Subject:
anti-inflammatory activity; clove oil; curcumin; drugs; hydrodynamics; inflammation; lipid content; nanoemulsions; oils; pH; permeability; polysorbates; refractive index; scanning electron microscopy; solubility; surfactants; temperature; tissue repair; transdermal application; transmission electron microscopy; transmittance; ultrasonic treatment; viscosity; zeta potential
Abstract:
... The aim of this study was to develop and evaluate a curcumin (Cur) nanoemulsion (NE) and enhance transdermal drug delivery. The comparative effects of Cur-NE were evaluated in terms of wound healing and anti-inflammatory action. Clove oil (oil), Tween-80 (surfactant), and PEG-400 (co-surfactant) were selected on the basis of their solubility and maximum nanoemulsion region. An aqueous micro-titrat ...
DOI:
10.1039/c9ra03102b

10. DFT study of the therapeutic potential of phosphorene as a new drug-delivery system to treat cancer

Author:
Arshad, Ahmad Wahab,   et al.   ; Tariq, Amina; Nazir, Sidra; Nawaz, Faisal; Ayub, Khurshid; Iqbal, Javed;     Show all 6 Authors
Source:
RSC advances 2019 v.9 no.42 pp. 24325-24332
ISSN:
2046-2069
Subject:
drug delivery systems; drugs; electron transfer; fluorescence; geometry; neoplasms
Abstract:
... In this study, the therapeutic potential of phosphorene as a drug-delivery system for chlorambucil to treat cancer was evaluated. The geometric, electronic and excited state properties of chlorambucil, phosphorene and the phosphorene–chlorambucil complex were evaluated to explore the efficiency of phosphorene as a drug-delivery system. The nature of interaction between phosphorene and chlorambucil ...
DOI:
10.1039/c9ra02778e

11. Removal of Hg(ii) in aqueous solutions through physical and chemical adsorption principles

Author:
Ahmad, Nasir M.,   et al.   ; Xia, Mengdan; Chen, Zhixin; Li, Yao; Li, Chuanhua; Cheema, Waqas A.; Zhu, Shenmin;     Show all 7 Authors
Source:
RSC advances 2019 v.9 no.36 pp. 20941-20953
ISSN:
2046-2069
Subject:
adsorbents; adsorption; aqueous solutions; drinking water; heavy metals; mercury; metal ions; oxides; pollution; surface area; toxicity; wastewater
Abstract:
... Adsorption has been the focus of research on the treatment of heavy metal mercury pollution since it is among the most toxic heavy metals in existence. The US EPA has set a mandatory discharge limit of 10 μg Hg L⁻¹ for wastewater and for drinking water a maximum accepted concentration of 1 μg Hg L⁻¹. Physical adsorption and chemical adsorption are the two major mechanisms of adsorption methods use ...
DOI:
10.1039/c9ra01924c

12. Sodium tanshinone IIA silate increases melanin synthesis by activating the MAPK and PKA pathways and protects melanocytes from H₂O₂-induced oxidative stress

Author:
Ahmad, Owais,   et al.   ; Zhong, Hui; An, Xiaohong; Li, Yu; Cai, Minxuan; Shang, Jing; Zhou, Jia;     Show all 7 Authors
Source:
RSC advances 2019 v.9 no.33 pp. 18747-18757
ISSN:
2046-2069
Subject:
Danio rerio; adrenal cortex hormones; apoptosis; cAMP-dependent protein kinase; cerebrovascular disorders; hydrogen peroxide; melanin; melanocytes; melanogenesis; mitochondria; mitogen-activated protein kinase; oxidative stress; patients; sulfonates; therapeutics; China
Abstract:
... Vitiligo is an intriguing depigmentation disorder that affects about 0.5–2% of the world population. In the past decade, first-line treatments of vitiligo have involved the use of calcineurin inhibitors and corticosteroids. Sodium tanshinone IIA sulfonate (STS) has been widely applied in the treatment of cardiovascular and cerebrovascular diseases in China. In the present study, the effect of STS ...
DOI:
10.1039/c8ra09786k

13. Fundamentals and applications of acrylamide based microgels and their hybrids: a review

Author:
Irfan, Ahmad,   et al.   ; Begum, Robina; Farooqi, Zahoor H.; Ahmed, Ejaz; Sharif, Ahsan; Wu, Weitai;     Show all 6 Authors
Source:
RSC advances 2019 v.9 no.24 pp. 13838-13854
ISSN:
2046-2069
Subject:
acrylamides; catalytic activity; drugs; environmental factors; ionic strength; microgels; moieties; nanotechnology; pH; temperature
Abstract:
... Acrylamide based microgels have gained a lot of attention in the last three decades due to their potential applications in various fields based on their responsive behavior and chemical stability. In this article, the synthesis, properties, and applications of poly(N-isopropylacrylamide-co-acrylamide) [P(NIPAM-Am)] microgels and P(NIPAM-Am) microgels having an additional ionic moiety in their netw ...
DOI:
10.1039/c9ra00699k

14. Fabrication of polyaniline–graphene/polystyrene nanocomposites for flexible gas sensors

Author:
Ahmad, Zubair,   et al.   ; Bhadra, Jolly; Popelka, Anton; Abdulkareem, Asma; Touati, Farid; Al-Thani, Noora;     Show all 6 Authors
Source:
RSC advances 2019 v.9 no.22 pp. 12496-12506
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorption; carbon dioxide; chemical interactions; coatings; electric current; electric potential difference; electrical conductivity; graphene; nanocomposites; nanofibers; polystyrenes; roughness; scanning electron microscopy; surface area; thermal stability
Abstract:
... This research work presents the fabrication of polyaniline (PANI) and graphene–polyaniline (graphene–PANI) nanocomposite-coated polystyrene (PS) nanofibre mats, as well as their application in flexible and highly sensitive gas sensors. The surface morphology of the flexible films is investigated using a number of techniques. The profilometry studies confirmed that the electrospun fibres are evenly ...
DOI:
10.1039/c9ra00936a

15. One-dimensional facile growth of MAPbI₃ perovskite micro-rods

Author:
Ahmad, Zubair,   et al.   ; Mishra, Arti; Touati, Farid; Shakoor, R. A.; Nazeeruddin, Mohammad Khaja;     Show all 5 Authors
Source:
RSC advances 2019 v.9 no.20 pp. 11589-11594
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; ambient temperature; crystals; differential scanning calorimetry; energy-dispersive X-ray analysis; scanning electron microscopy; solar cells; spectral analysis; thermogravimetry; transmission electron microscopy; weight loss
Abstract:
... One-dimensional microrods (4–5 mm) of PbI₂ and CH₃NH₃PbI₃ (MAPbI₃) with unique structural and morphological properties have been grown at room temperature. X-ray diffraction (XRD) patterns of both types of micro-rods exhibit a hexagonal system (P3̄m1(164) space group) with 2H polytype structures. In the case of PbI₂, the atomic composition of the microcrystals indicates the formation of pure phase ...
DOI:
10.1039/c9ra00200f

16. Deep-learning-based target screening and similarity search for the predicted inhibitors of the pathways in Parkinson's disease

Author:
Ahmad, Nisar,   et al.   ; Khan, Abbas; Chandra Kaushik, Aman; Ali, Syed Shujait; Wei, Dong-Qing;     Show all 5 Authors
Source:
RSC advances 2019 v.9 no.18 pp. 10326-10339
ISSN:
2046-2069
Subject:
Gibbs free energy; Parkinson disease; amine oxidase (flavin-containing); computer simulation; drugs; molecular dynamics; neural networks; prediction; screening
Abstract:
... Herein, a two-step de novo approach was developed for the prediction of piperine targets and another prediction of similar (piperine) compounds from a small molecule library using a deep-learning method. Deep-learning and neural-network approaches were used for target prediction, similarity searches, and validation. The present approach was trained on records containing the data. The model attaine ...
DOI:
10.1039/c9ra01007f

17. Vanadyl β-tetrabromoporphyrin: synthesis, crystal structure and its use as an efficient and selective catalyst for olefin epoxidation in aqueous medium

Author:
Dar, Tawseef Ahmad,   et al.   ; Tomar, Reshu; Mian, Rasel Mohammad; Sankar, Muniappan; Maurya, Mannar Ram;     Show all 5 Authors
Source:
RSC advances 2019 v.9 no.18 pp. 10405-10413
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; catalysts; catalytic activity; crystal structure; electrochemistry; electron paramagnetic resonance spectroscopy; epoxidation reactions; matrix-assisted laser desorption-ionization mass spectrometry; porphyrins; temperature; vanadyl ions
Abstract:
... We hereby report the synthesis, characterization and catalytic applications in the epoxidation of alkenes by a vanadyl porphyrin having bulky bromo substituents at the β-positions viz. vanandyltetrabromotetraphenylporphyrin (1). The synthesized porphyrin was characterized by various spectroscopic techniques like UV-visible, FT-IR, EPR, MALDI-TOF mass spectrometry and single crystal X-ray analysis. ...
DOI:
10.1039/c8ra09825e

18. Pilot-scale production of a highly thermostable α-amylase enzyme from Thermotoga petrophila cloned into E. coli and its application as a desizer in textile industry

Author:
Saleem, Mushtaq Ahmad,   et al.   ; Zafar, Asma; Aftab, Muhammad Nauman; Iqbal, Irfana; Din, Zia ud;     Show all 5 Authors
Source:
RSC advances 2019 v.9 no.2 pp. 984-992
ISSN:
2046-2069
Subject:
Escherichia coli; Thermotoga; agitation; air; alpha-amylase; dissolved oxygen; fermenters; gene expression; industrial applications; lactose; pH; temperature; textile industry; thermal stability; thermostable enzymes
Abstract:
... In this study, the industrial applications of a highly thermostable α-amylase as a desizer in the textile industry was evaluated. The cloned gene was expressed in different media (ZBM, LB, ZYBM9, and ZB) with IPTG (isopropyl β-d-1-thiogalactopyranoside) used as an inducer. Lactose was also used as an alternate inducer for the T7 promoter system in E. coli. For the large-scale production of the enz ...
DOI:
10.1039/c8ra06554c

19. A case study of Fe₂TaZ (Z = Al, Ga, In) Heusler alloys: hunt for half-metallic behavior and thermoelectricity

Author:
Khandy, Shakeel Ahmad; Bhat, Muzzammil Ahmad; Ahmad, Shabir,   et al.   ; Islam, Ishtihadah; Gupta, Dinesh C.; Dar, Tanveer Ahmad; Rubab, Seemin; Dhiman, Shobhna; Laref, A.;     Show all 9 Authors
Source:
RSC advances 2018 v.8 no.71 pp. 40996-41002
ISSN:
2046-2069
Subject:
alloys; aluminum; case studies; electrical conductivity; gallium; indium; iron; magnetism; prediction; tantalum; thermal conductivity
Abstract:
... We have computed the electronic structure and transport properties of Fe₂TaZ (Z = Al, Ga, In) alloys by the full-potential linearized augmented plane wave (FPLAPW) method. The magnetic conduct in accordance with the Slater–Pauling rule classifies them as non-magnetic alloys with total zero magnetic moment. The semiconducting band profile and the density of states in the post DFT treatment are used ...
DOI:
10.1039/c8ra04433c

20. The role of the solvent and the size of the nanotube in the non-covalent dispersion of carbon nanotubes with short organic oligomers – a DFT study

Author:
Alrawashdeh, Ahmad I.,   et al.   ; Lagowski, Jolanta B.;     Show all 2 Author
Source:
RSC advances 2018 v.8 no.53 pp. 30520-30529
ISSN:
2046-2069
Subject:
carbon nanotubes; chemical interactions; chloroform; density functional theory; dispersants; hexane; models; solvents
Abstract:
... Among different dispersants of single-walled carbon nanotubes (SWCNTs), conjugated organic oligomers have the ability to interact strongly with SWCNTs and allow for effective dispersion in several organic solvents. Recently, we have carried out two computational investigations on the intermolecular interactions between conjugated organic oligomers and SWCNTs in order to gain insight into an import ...
DOI:
10.1039/c8ra02460j