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Photocatalytic and Antibacterial Activities of Ag/ZnO Nanocomposities Fabricated by Co-Precipitation method

Acta metallurgica Sinica(English Letters) 2014年第2期27卷 223-232页

作者： md.Abdus Subhan m.R.Awal Tanzir Ahmed m.younus Department of Chemistry Shah Jalal University of Science and Technology

A Ag/ZnO nanocomposite has been synthesized and characterized for investigating its photocatalytic activity. The morphology and particle size of the Ag/ZnO was studied by scanning electron microscope （SEm） and the microstructure of the as-synthesized nanocomposite was confirmed by X-ray diffraction （XRD） analysis. The elemental com- position of the metal oxide was determined by energy dispersion spectrometry （EDS）. Diffuse reflectance spectra （DRS）, Photoluminescence （PL） spectra, and Fourier transform infrared spectroscopy （FTIR） were also studied for characterizing the nanocomposite. The average particle size was found to be around 20-30 nm. Photocatalytic activity of Ag/ZnO has been investigated over methyl violet （6B） dye under UV and visible light irradiation. The degradation of methyl violet （6B） dye using ZnO and Ag/ZnO was compared and found that Ag/ZnO composite is more efficient than ZnO. The rate of disappearance of dye was monitored spectrophotometrically in the maximum visible absorption wavelength and the extent of degradation was discussed in terms of Langmuir-Hinshelwood model. The Ag/ZnO composite was found capable of degrading the industrial dye effluent. Effect of H202 addition on dye degradation by the Ag/ZnO was investigated and Ag/ ZnO was found to be an effective antimicrobial agent. Reusability of Ag/ZnO catalyst was also tested.

关键词： Nanocomposite Photocatalyst metal oxide Dye degradation Photoluminescence

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Evolution of plasma parameters in an Ar-N2/He inductive plasma source with magnetic pole enhancement

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Plasma Science and Technology 2017年第2期19卷 34-42页

作者： maria younus N U REHmAN m SHAFIQ m NAEEm m ZAKA-UL-ISLAm m ZAKAULLAH Department of Physics Plasma Physics LaboratoryQuaid-i-Azam University45320 IslamabadPakistan Plasma Physics Laboratory Department of PhysicsCOMSATS Institute of Information Technology44000 IslamabadPakistan Department of Physics Faculty of ScienceJazan University114 JazanSaudi Arabia

magnetic pole enhanced inductively coupled plasmas （maPE-ICPs） are a promising source for plasma-based etching and have a wide range of material processing applications. In the present study Langmuir probe and optical emission spectroscopy were used to monitor the evolution of plasma parameters in a maPE-ICP Ar-Na/He mixture plasma. Electron density （ne） and temperature （Te）, excitation temperature （Texc）, plasma potential （Vp）, skin depth （6） and the evolution of the electron energy probability function （EEPF） are reported as a function of radiofrequency （RF） power, pressure and argon concentration in the mixture. It is observed that ne increases while Te decreases with increase in RF power and argon concentration in the mixture. The emission intensity of the argon line at 750.4 nm is also used to monitor the variation of the ‘high-energy tail＇ of the EEPF with RF power and gas pressure. The EEPF has a ‘bi-maxwellian＇ distribution at low RF powers and higher pressure in a pure N2 discharge. However, it evolves into a ‘maxwellian＇ distribution at RF powers greater than 70 W for pure N2, and at 50 W for higher argon concentrations in the mixture. The effect of argon concentration on the temperatures of two electron groups in the ‘bi-maxwellian＇ EEPF is examined. The temperature of the low-energy electron group TL shows a decreasing trend with argon addition until the ‘thermalization＇ of the two temperatures occurs, while the temperature of high-energy electrons Ta decreases continuously.

关键词： maPE-ICP Langmuir probe OES EEPF

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Phase-junction Ag/TiO_(2)nanocomposite as photocathode for H_(2)generation

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Journal of materials Science & Technology 2021年第24期83卷 179-187页

作者： Hemdan S.H.mohamed mohamed Rabia Xian-Gang Zhou Xu-Sen Qin Gomaa Khabiri mohamed Shaban Hussein A.younus S.Taha Zhi-Yi Hu Jing Liu Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Physics Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanophotonics and Applications Lab Physics DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef62514Egypt Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan430070China Laboratory of Inorganic materials Chemistry(CmI) University of Namur61 rue de Bruxelles5000NamurBelgium

Developing anatase/rutile phase-junction in Ti O_(2)to construct Z-scheme system is quite effective to improve its photoelectrochemical *** this work,the anatase/rutile phase-junction Ag/Ti O_(2)nanocomposites are developed as photocathodes for hydrogen *** optimized Ag/Ti O_(2)nanocomposite achieves a high current density of 1.28 m A cm-2,an incident photon-to-current conversion efficiency(IPCE)of 10.8%,an applied bias photon-to-current efficiency(ABPE)of 0.32 at 390 nm and a charge carriers’lifetime up to 2000 *** enhancement on photoelectrochemical activity can be attributed to:(ⅰ)the generated Z-scheme system in the anatase/rutile phase-junction Ag/Ti O_(2)photocathode enhances the separation,diffusion and transformation of electron/hole pairs inside the structure,(ⅱ)Ag nanodots modification in the anatase/rutile phases leading to the tuned band gap with enhanced light absorption and(ⅲ)the formed Schottky barrier after Ag nanodots surface modification provides enough electron traps to avoid the recombination of photogenerated electrons and *** results here suggest that developing phase-junction nanocomposite as photocathode will provide a new vision for their enhanced photoelectrochemical generation of hydrogen.

关键词： Ag/TiO_(2)nanocomposites Anatase/rutile phase-junction Z-scheme Photocathode H2 generation

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