Nghiên cứu ứng dụng phân hủy chất màu công nghiệp trong thực phẩm bằng vật liệu xúc tác quang hóa khả kiến Zn/ZnO/TiO2-Ag

Abstract

Ag-doped TiO₂ amorphous composite film coupled with metal oxide semiconductor ZnO on Zn-slide as a novel visible light photocatalyst is synthesized. The material is characterized using various analytical techniques such as X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDS) and Diffusive Reflectance Spectroscopy (DRS). It is indicated that the presence of the dopant, Ag, on Zn/ZnO/TiO₂ film enhances its catalytic activity in VIS region. For environmental application, the photocatalytic activities of the material are evaluated by degradation of an artificial dye, tartazine, under sunlight. Furthermore, the effect of pH and H₂O₂ as an oxidizing agent on the degradation efficiency of the material is also investigated. The results show the optimal conditions for the photodegradation of the tartazine 0.5 mg sample are pH 5 and 3 ml H₂O₂ 10 % in 6-hour irradiation.