H_2O_2强化g-C_3N_4可见光电催化降解亚甲基蓝的研究  

Photoelectrocatalytic degradation of methylene blue by g-C_3N_4 film electrode assisted by H_2O_2

作　　者：齐璠静 李一兵[1] 王彦斌[2] 王云飞[1] 王雁[2] 曾华斌[2] 马忠虹 赵旭[2] Fanjing Qi Yibing Li Yanbin Wang Yunfei Wang Yan Wang Huabin Zeng Zhonghong Ma Xu Zhao(School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]中国科学院生态环境研究中心环境水质学实验室,北京100085

出　　处：《中国科学：化学》2017年第3期376-382,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:21377148;51578532)资助项目

摘　　要：通过高温液相生长法在氧化铟锡玻璃上构筑了g-C_3N_4薄膜电极,该电极作为阳极在H_2O_2辅助作用下光电催化降解亚甲基蓝.研究结果表明,g-C_3N_4与H_2O_2在可见光下存在协同作用;在外加电压1.5 V,50 mmol L-1H_2O_2条件下,亚甲基蓝的降解率在2 h内由35.92%提高至53.43%.系统研究了H_2O_2浓度、外加电压、初始p H对亚甲基蓝降解的影响.采用电子顺磁共振自旋捕捉技术和自由基猝灭实验等方法证实了·O2-和·OH为光电催化过程中的主要氧化物种,提出了可能的催化反应机理,在外加H_2O_2条件下,g-C_3N_4受可见光激发生成的光生电子被O2或H_2O_2捕获,最终生成·OH,从而将有机染料降解.g-C_3N_4薄膜电极表现出较高的稳定性.In this paper, g-C3N4 film was prepared by a liquid-based reaction onto ITO substrate during the calcination treatment and used as photoanode for photoelectrocatalytic degradation of MB with H2O2 added. The results showed synergistic effects between g-C3N4 and H2O2 under visible-light irridiation and indicated that the degradation of MB increased from 35.92% to 53.43% efficiently with the addition of 50 mmol L^-1 H2O2 at 1.5 V in 2 h. Furthermore, the affecting factors of H2O2 concentration, applied bias potential and initial p H were investigated. It was confirmed that ·O2^- as well as ·OH were the main oxidized species in photoelectrocatalytic process by ESR analyses and radical masking experiments. It was proposed that photo-generated electrons could be captured by O2 or H2O2 to generate ·OH for the oxidative degradation of organic dye when H2O2 was added in g-C3N4-vis system. Moreover, the g-C3N4 film electrode showed a higher chemical stability.

关 键 词：光电催化氧化 石墨相氮化碳 过氧化氢 有机染料 

分 类 号：O643.36[理学—物理化学]