g-C_(3)N_(4)/Ag_(3)PO_(4)复合光催化剂的制备及其降解盐酸四环素的研究

Preparation of C_(3)N_(4)/Ag_(3)PO_(4) Composite Photocatalyst and its Degradation of Tetracycline Hydrochloride

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-C_(3)N_(4)/Ag_(3)PO_(4)复合光催化剂,借助XRD、FT-IR、SEM等进行表征,成功构筑出g-C_(3)N_(4)/Ag_(3)PO_(4)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·O_(2)^(-)。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/Ag_(3)PO_(4)-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-C_(3)N_(4)/Ag_(3)PO_(4)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。

To address the problems of small specific surface and high optical carrier complexation rate of g-C_(3)N_(4),this paper prepared g-C_(3)N_(4)/Ag_(3)PO_(4) composite photocatalyst by in situ deposition,and successfully constructed g-C_(3)N_(4)/Ag_(3)PO_(4) heterojunction with the help of XRD,FT-IR and SEM for characterization.The active species producing the photocatalytic degradation was mainly·O_(2)^(-)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/Ag_(3)PO_(4)-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-C_(3)N_(4)/Ag_(3)PO_(4) composites were applied to degrade tetracycline in actual water bodies all showed good performance.