g-C_(3)N_(4)/BiOCl复合材料的制备及其光催化性能研究  

Preparation and photocatalytic properties of g-C_(3)N_(4)/BiOCl composites

作　　者：梁新月 黄贺东 孟凡杰 侯建鑫 郭泽宇[1,2] Liang Xinyue;Huang Hedong;Meng Fanjie;Hou Jianxin;Gou Zeyu(School of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot 010018;Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization,Inner Mongolia Agricultural University,Hohhot 010018)

机构地区：[1]内蒙古农业大学材料科学与艺术设计学院,呼和浩特010018 [2]内蒙古农业大学内蒙古自治区沙生灌木资源纤维化和能源化利用重点实验室,呼和浩特010018

出　　处：《化工新型材料》2023年第6期218-224,共7页New Chemical Materials

基　　金：国家自然科学基金(51962029);内蒙古自治区科技计划项目(2019GG265);内蒙古农业大学高层次人才启动项目(NDGCC2016-20);内蒙古自治区高等学校“青年科技英才支持计划”项目(NJYT-19-A08);内蒙古自治区“草原英才”工程青年创新创业人才项目(内人社办函[2022]274号);内蒙古自治区重大专项(2020ZD0024);内蒙古自然科学基金——杰出青年科学基金项目(2022JQ08)。

摘　　要：高温缩聚法合成g-C_(3)N_(4)和水热法制备的BiOCl,在室温下通过简单的物理搅拌使片层状g-C_(3)N_(4)附着在菊花状的BiOCl上,控制g-C_(3)N_(4)的质量分数分别为5%、10%、15%、20%和25%,合成g-C_(3)N_(4)/BiOCl复合光催化剂。通过扫描电镜(SEM)、EDS能谱和BET比表面表征方法,揭示了g-C_(3)N_(4)/BiOCl复合光催化剂的微观结构;紫外-可见光(UV-Vis)结果显示g-C_(3)N_(4)/BiOCl可将光吸收范围延伸到可见光范围,其中BiOCl/CN-10具有更窄的禁带宽度;荧光光谱(PL)证实BiOCl/CN-10抑制光生载流子的复合能力最强;同时对g-C_(3)N_(4)/BiOCl降解染料废水罗丹明B(RhB)、亚甲基蓝(MB)和甲基橙(MO)的光催化能力进行了评估,结果表明g-C_(3)N_(4)/BiOCl对RhB具有优异的光催化降解能力,其中BiOCl/CN-10在光反应40min时就达到了97.23%,其光催化性能远远优于纯BiOCl。BiOCl/CN-10优异的光催化性能可能是由于g-C_(3)N_(4)与BiOCl形成p-n的异质结可促进更多的光生电子定向转移,使催化剂中更多的活性位点参与光催化氧化反应,从而有效提高光催化活性。g-C_(3)N_(4) was synthesized by high-temperature polycondensation method and BiOCl was prepared by hydrothermal method.By simple physical stirring at room temperature,the lamellar g-C_(3)N_(4) was successfully attached to chrysanthemum-like BiOCl to obtain g-C_(3)N_(4)/BiOCl composite photocatalysts,with g-C_(3)N_(4) mass fraction of 5%,10%,15%,20%and 25%,respectively.The microstructure of g-C_(3)N_(4)/BiOCl composite photocatalysts was revealed by SEM,EDS and BET specific surface characterization method.UV-Vis results showed that g-C_(3)N_(4)/BiOCl could extend the light absorption range to the visible light range,where BiOCl/CN-10 had a narrower band gap.Fluorescence spectra(PL)confirmed that g-C_(3)N_(4)/BiOCl-10 had the strongest ability to inhibit the recombination of photogenerated carriers.Meanwhile,the photocatalytic capacity of g-C_(3)N_(4)/BiOCl for the degradation of RhB,MB and MO in dye wastewater was evaluated.The results showed that g-C_(3)N_(4)/BiOCl had excellent photocatalytic capacity for the degradation of RhB,in which BiOCl/CN-10 reached 97.23%after 40min of photocatalytic reaction.Its photocatalytic performance was far superior to that of pure BiOCl.The excellent photocatalytic performance of BiOCl/CN-10 might be due to the formation of p-n heterojunction between g-C_(3)N_(4) and BiOCl,which could promote more photogenic electron directional transfer,and enabled more active sites in the catalyst to participate in the photocatalytic oxidation reaction,thus effectively improving the photocatalytic activity.

关 键 词：g-C_(3)N_(4) BiOCl 异质结 复合光催化剂 

分 类 号：TS102.523[轻工技术与工程—纺织工程]