pg-C_(3)N_(4)/BiOBr/Ag复合材料的制备及其光催化降解磺胺甲噁唑  

Preparation of pg-C_(3)N_(4)/BiOBr/Ag Composite and Photocatalytic Degradation of Sulfamethoxazole

作　　者：杨利伟[1] 刘丽君 夏训峰[2] 朱建超[2] 高生旺[2] 王洪良 王书平[2] YANG Li-wei;LIU Li-jun;XIA Xun-feng;ZHU Jian-chao;GAO Sheng-wang;WANG Hong-liang;WANG Shu-ping(College of Civil Engineering,Chang'an University,Xi'an 710000,China;Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]长安大学建筑与工程学院,西安710000 [2]中国环境科学研究院,北京100012

出　　处：《环境科学》2021年第6期2896-2907,共12页Environmental Science

基　　金：国家重点研发计划项目(2017YFD080140103,2018YFE0103800)。

摘　　要：通过简易的高温煅烧和共沉淀方法成功制备出pg-C_(3)N_(4)/Bi OBr/Ag复合材料,通过XRD、SEM、TEM、XPS、UV-Vis、BET和光电流等检测手段对其进行表征,并探究了该复合材料在模拟可见光照射下对10 mg·L^(-1)磺胺甲噁唑的降解效果.结果表明,当银单质的负载比例为5%时,pg-C_(3)N_(4)/BiOBr/Ag复合材料对磺胺甲噁唑的降解效果最佳.与pg-C_(3)N_(4)、BiOBr单体和二元复合材料pg-C_(3)N_(4)/BiOBr相比,pg-C_(3)N_(4)/Bi OBr/Ag(5%)光催化降解磺胺甲噁唑的效果显著提升,在30 min内降解率几乎接近100%,反应速率常数(0.2101 min-1)是pg-C_(3)N_(4)/BiOBr的13.15倍.通过自由基猝灭实验,证明在光催化降解过程中,起主要作用的活性物质是空穴(h+)、超氧自由基(·O_(2)^(-))和单线态氧(^(1)O_(2)),其中,超氧自由基(·O_(2)^(-))贡献最大.对pg-C_(3)N_(4)/Bi OBr/Ag进行多次循环实验,证明合成的材料具有良好的循环稳定性能,应用前景良好.A pg-C_(3)N_(4)/Bi OBr/Ag composite was successfully prepared by simple high-temperature calcination and co-precipitation methods.The composite was characterized by means of XRD,SEM,TEM,XPS,UV-Vis,BET,and photocurrent analyses alongside other detection methods,and the degradation of 10 mg·L^(-1)sulfamethoxazole was investigated under simulated visible light irradiation.The results showed that the pg-C_(3)N_(4)/Bi OBr/Ag composite had the best degradation effect on sulfamethoxazole when the loading ratio of silver was 5%.Compared with pg-C_(3)N_(4),Bi OBr monomer,and pg-C_(3)N_(4)/Bi OBr composite,the photocatalytic degradation effect of the pg-C_(3)N_(4)/Bi OBr/Ag(5%)was significantly improved,and the degradation rate was almost 100%within 30 min.The reaction rate constant(0.21016 min-1)was 13.15 times that of pg-C_(3)N_(4)/Bi OBr.Through radical quenching experiments,it was shown that the main active substances in the photocatalytic degradation were holes(h+),superoxide radicals(·O_(2)^(-)),and singlet oxygen(^(1)O_(2)),among which superoxide radicals(·O_(2)^(-))contributed the most.Cyclic tests of pg-C_(3)N_(4)/Bi OBr/Ag showed that the synthesized material has good recyclability and application prospects.

关 键 词：磺胺甲噁唑 光催化 氮化碳 溴氧化铋 银 

分 类 号：X703.1[环境科学与工程—环境工程]