石墨相氮化碳协同UV-H_2O_2光催化降解亚甲基蓝  

Photocatalytic degradation of methylene blue by graphitic carbon nitride combined with UV-H_2O_2 system

作　　者：占昌朝[1,2] 王春风 叶志刚[1,2] 徐冰洁 杨涛[1,2] 舒李露 ZHAN Changchao;WANG Chunfeng;YE Zhigang;XU Bingjie;YANG Tao;SHU Lilu(College of Chemistry and Environmental Engineering,Jiujiang University,Jiujiang Jiangxi 332005,China;Jiangxi Province Engineering Research Center of Ecological Chemical Industry,Jiujiang Jiangxi 332005,China)

机构地区：[1]九江学院化学与环境工程学院,江西九江332005 [2]江西省生态化工工程技术研究中心,江西九江332005

出　　处：《化工环保》2018年第4期379-384,共6页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(51562016;21566013;21767013);江西省自然科学基金项目(20171BAB206015);九江学院科技基金项目(2016KJ005)

摘　　要：以三聚氰胺为前驱体,经热解—回流法制备了石墨相氮化碳(g-C3N4),采用XRD、FTIR、SEM、EDS、PL等技术对g-C_3N_4进行了表征。研究了g-C_3N_4在UV-H_2O_2体系中对废水中亚甲基蓝(MB)的光降解效果。实验结果表明,UV+g-C_3N_4催化剂+H_2O_2体系能协同降解MB,在初始MB质量浓度为20 mg/L、初始废水p H为5、废水体积为250 mL、g-C_3N_4加入量为0.10 g、H_2O_2浓度为0.4 mmol/L、反应温度为25℃的优化工艺条件下,紫外光照射70 min时MB脱色率达98.32%。g-C_3N_4催化剂具有较好的重复使用性能,使用5次后MB脱色率仍保持在95.10%。The graphitic carbon nitride（g-C3N4）was synthesized by pyrolysis and reflux method using melamine as precursor and characterized by XRD,FTIR,SEM,EDS and PL. The photodegradation effect of methylene blue（ MB） on g-C3N4 in UV-H2O2 system was investigated. The experimental results showed that MB could be degraded by UV＋g-C3N4 photocatalyst＋H2O2 system,and under the optimum process conditions of initial MB mass concentration 20 mg/L,initial wastewater pH 5,wastewater volume 250 mL,g-C3N4 amount 0.10 g,H2O2 concentration 0.4 mmol/L,reaction temperature 25 ℃ and radiation time 70 min,the decolorization rate of MB was 98.32%. In addition,the g-C3N4 photo-catalyst also showed good reusability and the decolorization rate of MB still remained 95.1% after 5 cycles.

关 键 词：紫外光 石墨相氮化碳 H2O2 协同效应 亚甲基蓝 

分 类 号：X703[环境科学与工程—环境工程]