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Yadav, O. P.
- Effect of Ag-N Co-Doping in Nanosize TiO2 on Photocatalytic Degradation of Methyl Orange Dye
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Affiliations
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
Source
Journal of Surface Science and Technology, Vol 29, No 3-4 (2013), Pagination:Abstract
Synergetically modified nanosize TiO2 semiconductor heterogeneous photocatalyst powder has been synthesized from TiCl4 precursor for producing efficient photocatalyst that may work under visible radiation. The crystallite phase and size of the as-synthesized photo-catalyst were determined by X-ray diffraction (XRD) technique. As-synthesized TiO2 was found to be nano-crystalline anatase. The absorption edge of the photo-catalyst was evaluated from the UV/ Visible diffuse absorbance spectra. The band gap energies (Ebg) of undoped-, Ag-doped-, Ndoped- and Ag-N co-doped TiO2 semiconductor photo-catalysts were found to be 3.14, 3.02, 2.56 and 2.45 eV, respectively. Co-doping of Ag and N in TiO2 has shown synergetic effect towards photo-catalytic degradation of methyl orange in aqueous solutions. Using Ag-N co-doped TiO2 photo-catalyst, degradation of methyl orange under UV and visible irradiations were 79.1% and 73.5%, respectively.Keywords
Absorbance, Degradation, Diffraction, Nanoparticles, Photo-Catalyst.
- Green Synthesis of Silver Nanoparticles and their Antibacterial Activity
Abstract Views :202 |
PDF Views:2
Authors
Affiliations
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
2 School of Applied Science, Chitkara University, Punjab, IN
3 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, IN
1 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, ET
2 School of Applied Science, Chitkara University, Punjab, IN
3 Chemistry Department, Haramaya University, Dire Dawa, Post Box-138, IN
Source
Journal of Surface Science and Technology, Vol 29, No 1-2 (2013), Pagination: 47-66Abstract
Silver nanoparticles have been prepared by the reduction of silver ions using respectively castor oil (ricinus communis), khat (catha edulis) and sun flower (helianthus annuus) leaf extracts as reducing and stabilizing agents. The as-synthesized material was characterized by using spectroscopic, XRD and TEM techniques. As-synthesized silver nanoparticles are found to have face centered cubic structure with average crystallite size 28 nm. and showed antimicrobial activity against Escherichia coli and Staphylococcus aureus.Keywords
Ag-Nanoparticles, Synthesis, Green Reducing Agents, Antimicrobial Activity.- Effect of Formamide on the Surface and Thermodynamic Properties of some Surfactant Solutions
Abstract Views :173 |
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Authors
Affiliations
1 Department of Chemistry and Physics, CCS Haryana Agricultural University, Hisar-125 004, IN
1 Department of Chemistry and Physics, CCS Haryana Agricultural University, Hisar-125 004, IN
Source
Journal of Surface Science and Technology, Vol 15, No 1-2 (1999), Pagination: 58-68Abstract
From the measured surface tension data, surface properties and thermodynamic quantities of micellization, adsorption at the air-liquid interface and transfer from water to mixed solvent (formamide + water) have been determined for the systems : (1) Sodium Dodecyl Sulphate + Formamide + Water; (2) Dodecyl Trimethyl Ammonium Bromide + Formamide + Water and (3) Triton X-100 + Formamide + Water. The process of micellization in the bulk solution and the adsorption of surfactants at the air-liquid interface are favoured by the enthalpy as well as the entropy effects. The results have been descirbed in terms of the intermolecular interaction of the components in the solutions.Keywords
Micellization, Adsorption, Mixed Solvents, Thermodynamics of the Processes, Intermolecular Interaction.- Cyclic Voltammetric Determination of Acetylsalicylic Acid (Aspirin) at Polyaniline (PANI) Modified Glassy Carbon Electrode
Abstract Views :201 |
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Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box : 138, Dire Dawa, ET
2 Biology Department, Haramaya University, Post Box : 138, Dire Dawa, ET
1 Chemistry Department, Haramaya University, Post Box : 138, Dire Dawa, ET
2 Biology Department, Haramaya University, Post Box : 138, Dire Dawa, ET
Source
Journal of Surface Science and Technology, Vol 30, No 3-4 (2014), Pagination: 149-161Abstract
Polyaniline (PANI)-modified glassy carbon electrode has been synthesized by electropolymerizing aniline for determining acetylsalicylic acid (ASA in pharmaceutical samples using cyclic and differential pulse voltammetric techniques. The best performance of the PANI modified glassy carbon electrode in 0.04 M Britton Robinson buffer was obtained at pH 2.0. Under these conditions single oxidation peak at a potential of 250 mV vs Ag/AgCl/sat'd KCl, characteristic of an irreversible reaction, was observed. Studies on the effects of pH, scan rate and substrate concentration revealed irreversible diffusion controlled electrode redox reaction. The PANI modified glassy carbon electrode showed higher electro-catalytic efficiency, compared to the unmodified one, for ASA determination.Keywords
Aspirin, Electro-Catalytic Efficiency, Pharmaceutical, Polyaniline, Voltammetry.- Effect on Photo-Catalytic Activity of Zinc Oxide Nanoparticles upon Doping with Silver and Sulphur in Degradation Reaction of Malachite Green
Abstract Views :295 |
PDF Views:2
Authors
Affiliations
1 Department of Chemistry, College of Natural and Computational Science, Haramaya University, Dire Dawa, ET
2 Chemistry Department, Panjab University, Chandigarh - 160014, Panjab, IN
1 Department of Chemistry, College of Natural and Computational Science, Haramaya University, Dire Dawa, ET
2 Chemistry Department, Panjab University, Chandigarh - 160014, Panjab, IN
Source
Journal of Surface Science and Technology, Vol 31, No 1-2 (2015), Pagination: 69-76Abstract
Zinc Oxide nanoparticles and their corresponding sulphur, silver and silver (silver + sulphur) doped variants have been prepared by mechano-chemical synthesis. These have been used as photocatalysts and were characterized by XRD, TEM, FTIR and UV-Visible spectroscopic techniques. Photocatalytic degradation of malachite green (MG) dye over these photocatalysts was studied under visible as well as UV radiations. The (Ag, S) co-doped ZnO exhibited the highest photocatalytic efficiency both under UV as well as visible radiations. It is observed that doping of Ag and S in ZnO had synergetic effect in improving its photo-catalytic activity. Photocatalytic degradation of Malachite Green (MG) dye is found to follow a pseudo first order kinetics.Keywords
Degradation, Mechano-Chemical, Nanoparticles, Photocatalyst, XRDReferences
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- Photo-catalytic Degradation of Methyl Orange Dye using ZnS and N-doped ZnS Nanoparticles under Visible Radiation
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Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
2 Chemistry Department, HNB Garhwal Central University, Srinagar, Uttarakhand, IN
3 Chemistry Department, Panjab University, Chandigarh - 160014, IN
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
2 Chemistry Department, HNB Garhwal Central University, Srinagar, Uttarakhand, IN
3 Chemistry Department, Panjab University, Chandigarh - 160014, IN
Source
Journal of Surface Science and Technology, Vol 31, No 3-4 (2015), Pagination: 184-189Abstract
ZnS and N-doped-ZnS nanoparticles were prepared by aqueous chemical method under optimal conditions and characterized using XRD, TEM and UV-Visible spectroscopic techniques. As-synthesized nanomaterials were used as a photo-catalysts for the degradation of Methyl Orange (MO) dye. Effects of photo-catalyst load, pH, and substrate initial concentration on degradation of the dye in aqueous solution have been investigated. Maximum degradation (76.56 %) of methyl orange was observed using optimum pH 6 and catalyst load 250 mgL-1.Keywords
Methyl Orange, Photo Catalysis, Nanoparticles, Rate of Degradation, XRD TEM.References
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- Photo-Catalytic Activity of Ag-N Co-Doped ZnO/CuO Nanocomposite for Degradation of Methyl Orange
Abstract Views :241 |
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Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, ET
Source
Journal of Surface Science and Technology, Vol 32, No 1-2 (2016), Pagination: 49-57Abstract
Nano-size Ag-N co-doped ZnO-CuO composites have been synthesized and tested for their photo-catalytic activity towards degradation of methyl orange in aqueous solution under visible as well as UV radiations. Crystal structure, surface functional groups, metallic composition and band structure of as-synthesized nano-material were investigated using XRD, FTIR, AAS and UV-Vis spectroscopic techniques, respectively. Ag-N co-doped ZnO-CuO photocatalyst showed higher photo-catalytic activity than Ag- or N-doped and undoped composite photocatalysts. The observed highest activity of Ag-N co-doped ZnO-CuO among the studied photo-catalysts, is attributed to the cumulative effects of lowering of band-gap energy and decrease of recombination rate of photo-generated electrons and holes owing to doped N and Ag, respectively. Effects of photo-catalyst load, solution pH and substrate initial concentration on the degradation of methyl orange have also been studied.Keywords
Band-Gap, Degradation, Nanocomposite, Photocatalysts, Rate Constant, Spectroscopy.References
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