سارا حسن پور

Abstract In this dissertation, modified ZSM-5 zeolite with ZnO and CuO and used as a photocatalyst to remove metformin from water. The crystalline structure and phase identification Zeolite and photocatalyst were performed at room temperature using X-ray diffraction, The morphologies of the samples were investigated by field emission scanning electron microscopy and energy-dispersive X-ray measurements, Fourier transform infrared spectroscopy to prove the removal process. The optical properties were investigated by UV-VIS diffuse reflectance spectroscopy also to eva‎luate the band-gap of the obtained composites with wavelengths from 200 to 800 nm with a value of 3ev. In order to investigate the process of photocatalytic reduction, 20 experiments were designed using Desigen-expert software, and the reduction percentage of metformin was measured with a value of 97% using visible-ultraviolet spectroscopic analysis. The effect of three operating factors, pH, dose of photocatalyst and the duration of ultraviolet light radiation, was investigated and optimized using the response surface method and the central composite design in 20 experiments and 5 levels, and the effect of each factor was eva‎luated separately and in three-dimensional diagrams. The optimal conditions obtained for metformin reduction percentage were obtained at a pH of 9.37, the dose of photocatalyst at 0.70 g/L and 40 minutes of ultraviolet light irradiation. In the accuracy of the method, the relative standard deviation was calculated as 0.28. The kinetics calculated in 10, 20, and 30 mg.L-1 solutions of metformin were obtained as R2 equal to 0.99, 0.97 and 0.95, respectively. The reusability of the photocatalyst was performed in 4 cycles, and in each cycle, the removal percentage was 97, 95.45, 94 and 91 respectively.

كاهش فوتوكاتاليزوري , زئوليت زد اس ام فايو , مس اكسيد , روي اكسيد , متفورمين

Photocatalytic Reduction , Photodegradation , ZSM-5 Zeolite , Zinc Oxide , Copper Oxide , Metformin

sara hasanpour

mansur anbia