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Kedir Ebrahim Ahmed,Dong-Hau Kuo,Lalisa Wakjira Duresa 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
In this report, we considered the control of electron-hole separation, oxygen vacancy formation, particlesize, and morphology together is supposed to boost the catalytic activity of the materials. Hence, BiOClphotocatalysts were synthesized by a systematic control of particle growth along reactive (001) planeusing simple hydrolysis method in KCl saturated aqueous solution with simultaneous UV light treatment. The materials were characterized using different techniques and the photocatalytic activities wereevaluated for degradation of different kinds of organic dyes. 20-BiOCl prepared with 20 mmol KCl showed99.9% RhB degradation within 10 min of visible light irradiation. From kinetics data, 20-BiOCl showed 7and 3 times higher rates on RhB dye degradation than untreated 20-BiOCl and unsaturated 5-BiOCl,respectively. Furthermore, 20-BiOCl catalyst also exhibited almost complete degradation of RhB, MO, andMB dyes under UV light irradiation. Supper oxide (O2. ) and hydroxyl ( OH) radicals are identified as themain active species on the degradation of RhB dye under visible light irradiation. Both KCl saturation andUV light treatment during synthesis of BiOCl catalysts play a crucial role to the extraordinaryphotocatlytic activities.
Fekadu Tadesse Bekena,Hairus Abdullah,Dong-Hau Kuo,Misganaw Alemu Zeleke 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Novel Mg-doped Zn(O,S) nanoparticles were synthesized by a chemical precipitation process at 90 C andthe prepared nanoparticles were characterized by XRD, SEM, HRTEM, XPS, UV–vis, DRS, PL, EIS, andphotocurrent response. The photocatalytic reduction for the 4-nitrophenol using Na2SO3 under UV lightirradiation showed that Mg–Zn(O,S)-2.5 exhibited higher activity compared with other samples. 96.7% of4-nitrophenolate ion reduced into 4-aminophenol within 45 min. Mg–Zn(O,S)-2.5 was also testedfor hydrogen evolution, where the rates of 1035 mmol/g for the 4-NP-free sample and 705 mmol/g for the4-NP-added one were achieved. Finally, the stability and reaction mechanism was mentioned.