The Modification And Properties Study Of Semiconductor Photocatalysis Materials

With the rapid development of industry, The kind and quantity of wastewater is increasing rapidly, the weak awareness of environmental protection and unreasonable pollution control technology lead to the water pollution more and more serious. Up to now, many physical and chemical methods also have been applied to remove these contaminants from wastewater, but, Most of the methods with low efficiency, large energy consumption, high cost and may cause secondary pollution. Semiconductor photocatalytic oxidation technology is a new type of modern water treatment technology,which has a wide range of application prospects for the degradation of many organic pollutants. But there are still many problems in the process of photocatalytic oxidation technology in the practical application, how to further modify them, making can better for human services is the purpose of our study.In this paper, we first synthesized the network-like structure r GO/Sn In₄S₈ with a low-temperature, the method is facile and simple synthesis and the efficiency of photocatalytic degradation of Rh B is high, at the same time, we synthesis the Zn Fe₂O₄/Sn S₂ composite catalyst, with doped graphene further to improve the photocatalytic degradation of methyl orange. In addition, g-C₃N₄ dopped with Sn S₂,makes the photocatalytic effect has been greatly improved. The details are summarized as follows:The network-like structure r GO/Sn In₄S₈ was synthesized by a low-temperature co-precipitation method. The different proportions of dopped r GO in Sn In₄S₈ has the impact on photocatalytic activity were investigated in the visible-light. The results showed that 5% RGO/Sn In₄S₈ possesses the optimal photocatalytic degradation efficiency.The Zn Fe₂O₄/Sn S₂ composite photocatalyst was synthesized by a high-temperature co-precipitation method and dopped some content of graphene to modify, the photocatalytic efficiency has been significantly improved. The results showed that 5%Zn Fe₂O₄/Sn S₂/r GO（7wt%） photocatalytic efficiency is the best, At the same time, the effect of degradation efficiency of methyl orange follows the order of h+ > ·O2-> ·OH.The Sn S₂ photocatalyst was synthesized by a high-temperature co-precipitation method and the different proportions of dopped g-C₃N₄ in Sn S₂ to prepare g-C₃N₄/Sn S₂ composite photocatalyst with the visible-light response and high catalytic activity. The results showed that 15%g-C₃N₄/Sn S₂ possesses the optimal photocatalytic degradation efficiency.