石墨相氮化碳同质结光催化处理水中双酚A  

Study on photocatalytic degradation of bisphenol A in water by graphite phase carbon nitride homojunction

作　　者：吴瞳 顾佳玉 彭晨 吴尚迪 陈欢[1] 江芳[1] WU Tong;GU Jia-yu;PENG Chen;WU Shang-di;CHEN Huan;JIANG Fang(School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学环境与生物工程学院,江苏南京210094

出　　处：《中国环境科学》2021年第7期3255-3265,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(51678306,51778295)。

摘　　要：通过甲醇辅助溶剂热预处理,设计和制备了石墨相氮化碳同质结光催化剂(x%MeCN-CN).利用TEM、XRD、FTIR、XPS、UV-Vis DRS、PL、EIS等手段对所制备催化剂进行表征分析.以水中双酚A(BPA)为目标污染物,考察了所得催化剂的光催化降解性能,通过活性物种捕获实验探究反应机制.结果表明,在模拟太阳光照射下,30%MeCN-CN具有最佳的光催化性能,4h对15mg/L BPA光催化降解率达98.9%,空穴和超氧自由基为主要活性物种.催化剂光催化活性的提升归因于醇热辅助预处理的能带调控作用和同质结结构的耦合作用,有效抑制了光生电子空穴对的复合,拓宽了光吸收范围.该催化剂具备良好的稳定性和循环利用能力,具有良好的应用前景.A graphite phase carbon nitride homojunction photocatalyst(x%MeCN-CN)was designed and prepared by methanol assisted solvothermal pre-treatment in this manuscript.The obtained photocatalyst was characterized by TEM,XRD,FTIR,XPS,UV-Vis DRS,PL and EIS.The photocatalytic degradation performance of the catalyst was investigated by using bisphenol A(BPA)as the target pollutant and the reaction mechanism was explored through the active species capture experiment.30%MeCN-CN has the best photocatalytic performance under simulated sunlight,and the photocatalytic degradation rate of 15mg/L BPA reached 98.9%in 4h,with the holes and superoxide radicals as the main active species.The improvement of photocatalytic activity of catalysts was attributed to the regulation of energy band and the coupling of homogeneous junction structure by alcohol-thermal assisted pretreatment,which effectively inhibited the photogenic electron hole pair recombination and broadened the light absorption range.In addition,the catalyst has excellent stability and recycling ability,and has a good application prospect.

关 键 词：石墨相氮化碳 同质结 光催化 双酚A 

分 类 号：X703[环境科学与工程—环境工程]