针对g-C3N4比表面小、光学载流子复合率偏高等问题，本文采用原位沉积的方法制备出g-C3N4/Ag3PO4复合光催化剂，借助XRD、FT-IR、SEM等进行表征，成功构筑出g-C3N4/Ag3PO4异质结。通过机理分析，产生光催化降解作用的活性物种主要为·O2-。探索了不同条件下对材料的光催化性能的影响，实验结果显示，CN/Ag3PO4-20 的复合光催化剂为最佳比例，在pH=7，T=25℃的条件下，其经过 2 h 的可见光辐射，光催化效率可达 89。31%，经 5 次实验后效率仍能达到 79。79%，获得较好的循环稳定性，同时将g-C3N4/Ag3PO4复合材料应用在实际水体中降解四环素均表现出良好性能。
Preparation of g-C3N4/Ag3PO4 Composite Photocatalyst and its Degradation of Tetracycline Hydrochloride
To address the problems of small specific surface and high optical carrier complexation rate of g-C3N4,this paper prepared g-C3N4/Ag3PO4 composite photocatalyst by in situ deposition,and successfully constructed g-C3N4/Ag3PO4 heterojunction with the help of XRD,FT-IR and SEM for characterization.The active species producing the photocatalytic degradation was mainly·O2-by the mechanism analysis.The effects of different conditions on the photocatalytic performance of the material were explored.The experimental results showed that the composite photocatalyst of CN/Ag3PO4-20 was the best ratio,and its photocatalytic efficiency could reach 89.31%after 2 h of visible light radiation at pH=7 and T=25℃.The efficiency could still reach 79.79%after 5 experiments,and a good cyclic stability was obtained.g-C3N4/Ag3PO4 composites were applied to degrade tetracycline in actual water bodies all showed good performance.
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