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Azita Mohagheghian,Kobra Ayagh,Kazem Godini,Mehdi Shirzad-Siboni 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Cr(VI) was reduced from synthetic, real drinking waters and real electroplating wastewater using the Fe3O4–WO3-3-aminopropyltriethoxysilane nanoparticles, as a heterogeneous catalyst, in the presence of visible light. The nanocatalyst was prepared via a simple co-precipitation method. FT-IR and SEM techniques proved the effective presence of an amino group. Under the optimum conditions: pH = 2, [Cr(VI)]0 = 10 mg/L, citric Acid = 10 mg/L, and nanocatalyst dosage = 6 g/L, 99.96% of Cr(VI) was removed after 300 min. Approximately 82.96% of Cr(VI) in a real water sample was removed after 1440 min under the optimal circumstances. Also, full treatment of electroplating wastewater was reached after 2880 min.
Azita Mohagheghian,Naghmeh Besharati-Givi,Kobra Ayagh,Mehdi Shirzad-Siboni 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
A convenient and low-cost co-precipitation method was utilized for stabilization of CuO nanoparticles onKaolin. The prepared CuO-Kaolin was characterized by XRD, FT-IR, SEM, EDX and pHPZC techniques. In thisempirical study, response surface methodology (RSM) based central composite design (CCD) was appliedfor optimization of operational factors in the photocatalytic removal of Diazinon (DZ). Under optimumconditions, i.e. initial pH=7, initial DZ concentration=30 mg L-1, photocatalyst amount=0.4g L-1 and inthe presence of oxalic acid, folic acid and sodium carbonate=5 mg L-1, about 87.23 % DZ removal wasachieved by CuO-Kaolin after 180 min of reaction. The ANOVA results of the polynomial model prove thatthe model is quite meaningful (F-value> 0.001 and P-value< 0.0001). Further, estimated electrical energyper order consumption (EEO) for visible light (VIS)/CuO-Kaolin system was calculated as 213.66 kWh m3with operational cost (OC) utilization of 52.053 USD kg1 that was revealed this process is highly feasibleand economic comparing with other photocatalytic processes (VIS/CuO, VIS/Kaolin and VIS). Ten cycleexperiments confirmed that the CuO-Kaolin propounded a satisfied stability and recycling potency. Byapplying the OFAT technique, 96.05 % of DZ degradation and 79.19 % of DZ mineralization could beachieved after 180 min. The five main compounds produced during the VIS/CuO-Kaolin embracing 2-isopropyl-6-methyl-4-pyrimidinol (IMP), diethyl phosphonate, diazoxon, hydroxydiazinon, and diazinonmethyl ketone are formed in the path of DZ degradation. The results of toxicity in the photocatalyticremoval of DZ by D. magna showed LC50 and TU 48 h equal to 18.79 and 5.32 vol percent.