Mg-ZnO光催化剂的合成及其降解卡马西平的研究

Synthesis and Degradation of Carbamazepine by Mg-ZnO Photocatalyst

采用溶解-结晶法制备了Mg-ZnO复合光催化剂,并用其降解卡马西平(Carbamazepine,CBZ)。通过SEM、Uv-vis对Mg-ZnO复合催化剂的形貌、光学性能进行表征,检测表明Mg掺杂量为6%时的复合催化剂具有最佳的光催化性能。探究了不同CBZ初始浓度、催化剂投加量、pH、光照强度对CBZ降解效能的影响,结果表明在CBZ初始浓度为3 mg/L,复合光催化剂投加量为0.8 g/L,pH为6.76,光源距离液面为10 cm的条件下,CBZ的去除率可达最佳,为98.3%,此时的反应速率也达到最快。自由基捕获实验表明该反应体系中的主要活性物质为空穴(h+)和羟基自由基(·OH)。研究表明,Mg的掺杂可有效提高ZnO的光催化性能,Mg-ZnO在紫外光条件下可有效降解水体中的CBZ,为PPCPs的降解提供了相关技术依据。

Mg-ZnO composite photocatalyst was prepared by solution-crystallization method and used to degrade Carbamazepine(CBZ).The morphology and optical properties of Mg-ZnO composite catalyst were characterized by SEM and UV-vis.The results showed that the composite catalyst with 6%of Mg doping amount had the best photocatalytic performance.The effects of different initial concentration of CBZ,dosage of catalyst,pH and light intensity on the degradation efficiency of CBZ were investigated.The results showed that under the conditions of 3 mg/L for CBZ initial concentration,0.8 g/L of composite photocatalyst dosage,pH of 6.76,and 10 cm of distance from light source to liquid level,the optimal removal rate of CBZ could reach to 98.3%and the reaction rate was the fastest.Free radical capture experiments showed that the main active substances in the reaction system were hole(H+)and hydroxyl radical(·OH).Mg doping can effectively improve the photocatalytic performance of ZnO,which can effectively degrade CBZ in water under ultraviolet light,providing a relevant technical basis for the degradation of PPCPs.