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Taddesse, Abi
- Effect of Ag-N Co-Doping in Nanosize TiO2 on Photocatalytic Degradation of Methyl Orange Dye
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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 :196 |
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 on Photo-Catalytic Activity of Zinc Oxide Nanoparticles upon Doping with Silver and Sulphur in Degradation Reaction of Malachite Green
Abstract Views :288 |
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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