| This study covers the perovskite photocatalyst materials for degradation of the malachite green in wastewater.Perovskite materials show multiple advantages,such as high light absorption capacity,fast carrier transfer rate,low preparation cost,simple synthesis process and easy adjustment of the material properties.However,perovskite materials have weak stability and are easily affected by external environmental factors such as light,heat and humidity.In addition,the light absorption range of perovskite materials is narrow,usually covering only the UV and visible lights,while the absorption capacity is weak for other wavelengths of light,such as infrared light and UV radiation in the solar spectrum.Moreover,some perovskite materials consist of toxic elements such as lead,which pose potential risks to the environment and human health.It is thus necessary to find more environmental-friendly alternative materials.Four specific solutions are proposed in this study.First,iso-valence elements such as Sn were used to replace toxic Pb.Second,coupling the base material with metal organic frameworks such as ZIF-67 can further improve the photocatalytic efficiency of perovskite.Then,precious metals such as Pt,Ag,or Au was added to the catalyst to significantly enhance the photocatalytic activity and stability of the catalyst.Finally,the influence of the third halogen element（Br or I）in halide perovskite materials and at different p H on their photocatalytic performance is studied in the late part of the studies.In this study,Au-ZIF-Cs Sn X3（X=Br,I）composite materials were synthesized to be used as photocatalysts.Simulated visible light from a xenon lamp light source was used to investigate the photocatalytic degradation of organic dye Malachite Green.The removal rate of Malachite Green can reach up to 60.4%when the initial concentration of Malachite Green solution is 0.01 mol/L and the catalyst dosage is 2000mg/L after 150 min of photocatalytic reaction. |
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