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Investigation of photocatalytic degradation of clindamycin antibiotic by using nano-ZnO catalysts
Mahdi Farzadkia,Kourosh Rahmani,Mitra Gholami,Ali Esrafili,Ayat Rahmani,Hassan Rahmani 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
The photocatalytic degradation of clindamycin (CLM) was studied by a batch reactor using UV irradiationand ZnO catalyst. The effects of several parameters such as pH, catalyst loading, light intensity and irradiation timewere evaluated in the removal process. The results showed that the degradation of CLM was effective in alkaline con-ditions. The optimum catalyst loading in an aqueous solution containing 25 mM of CLM and UV lamp of 50W wasobserved at 3.0 g/L of catalyst loading. The process followed pseudo-first order kinetics, and the apparent rate constant(k) decreased with increasing the initial concentration of CLM. The photocatalytic process had higher removal efficiencyin synthetic than actual wastewater in optimum conditions.
Photocatalytic reduction of hexavalent chromium with illuminated ZnO/TiO2 composite
Mohammad Naimi-Joubani,Mehdi Shirzad-Siboni,양재규,Mitra Gholami,Mahdi Farzadkia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
The purpose of this work was to investigate the photocatalytic reduction of Cr(VI) with illuminated ZnO/TiO2 composite at various catalyst dosage, pH, Cr(VI) concentration, purging gas, type of organiccompounds. FT-IR and XRD analysis demonstrated hybridization of ZnO nanoparticles and TiO2 particles. The photocatalytic reduction of Cr(VI) was increased with increasing photocatalyst dosage anddecreasing pH. The reaction rate constant (kobs) was decreased from 0.0879 to 0.0048 min 1 withincreasing Cr(VI) concentration from 20 to 100 mg/L. Removal efficiency of Cr(VI) by UV/ZnO/TiO2process was about 99.99%, which was more effective than that by UV/ZnO (82.33%) and UV/TiO2 process(86.07%).