对苯二甲醛掺杂石墨相氮化碳异质结光催化剂降解罗丹明B研究  

Study on photocatalytic degradation of Rhodamine B in wastewater by terephthalaldehyde doped graphite carbon nitride heterojunction

作　　者：王玉莹 尹凤超 付爽 李颖 杨海明[1] WANG Yuying;YIN Fengchao;FU Shuang;LI Ying;YANG Haiming(School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China;Anshan Ecological Environment Bureau,Anshan 11400,China;School of International Education,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学化学工程学院,辽宁鞍山114051 [2]鞍山市生态环境局,辽宁鞍山114051 [3]辽宁科技大学国际教育学院,辽宁鞍山114051

出　　处：《辽宁科技大学学报》2022年第5期393-400,共8页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金青年科学基金(51308276,51102126);辽宁省教育厅优秀人才项目(二层次2015055);辽宁省自然科学基金(2015020634);鞍山市科技项目(2691);辽宁科技大学创新团队项目(2017TD02);辽宁省教育厅项目(2020LNJC06);辽宁科技大学大学生创新创业训练计划(X202110146103)。

摘　　要：非金属半导体-石墨相氮化碳(g-C_(3)N_(4))作为新型的光催化剂被广泛研究,但g-C_(3)N_(4)存在光生电子-空穴复合率高的问题,使其应用受到限制。本文采用熔融法制备对苯二甲醛(TA)掺杂的g-C_(3)N_(4)异质结光催化剂(g-C_(3)N_(4)/TA-x/g-C_(3)N_(4),CNTA-x)。通过XRD、XPS、FT-IR、SEM、UV-vis DRS、EIS和PL方法对催化剂进行表征。TA的掺杂使CNTA-x具有更快的电子转移速度,可有效促进催化剂表面电子和空穴的分离,增强对可见光的利用,进而提升其光催化效率。在模拟太阳光照射下,经40 min光照CNTA-6对罗丹明B(20 mg/L)光催化降解率达到99.3%,是g-C_(3)N_(4)的1.32倍。循环实验表明,该催化剂具有良好的稳定性。捕获实验说明超氧自由基(·O^(2-))在光降解体系中起主要作用。Nonmetallic semiconductor-graphitic carbon nitride(g-C_(3)N_(4)),as a new-style photocatalyst,has been extensively studied.However,the application of g-C_(3)N_(4) is limited due to the high recombination rate of photo-induced electron-hole pairs.In this work,the terephthalaldehyde(TA)-doped g-C_(3)N_(4) homojunction and heterojunction photocatalyst(g-C_(3)N_(4)/TA-x/g-C_(3)N_(4),CNTA-x)were prepared by melt method.The catalysts were characterized by XRD、XPS、FT-IR、SEM、UV-vis DRS、EIS,and PL.The TA doping causes faster electron transfer speed of CNTA-x,which can effectively promote the separation of the photo-generated electrons and holes on the surface of the catalysts,enhance its utilization of visible light,and then significantly improve its photocatalytic efficiency.After 40 min irradiation by simulated sunlight,the photocatalytic degradation of RhB(20 mg/L)by CNTA-6 can reach 99.3%,which was 1.32 times that of g-C_(3)N_(4).Cyclic experiments show that the catalyst has good stability.Capture agent experiments show that superoxide radical(·O^(2-))played a major role in the photocatalystic degradation system.

关 键 词：光催化 g-C_(3)N_(4) 异质结 罗丹明B 

分 类 号：X703[环境科学与工程—环境工程]