摘要
使用溶剂热法成功地制备了由BiOBr、还原氧化石墨烯(RGO)和硅藻土组成的三元复合光催化剂,应用XRD、SEM、XPS、UV–Vis、BET和ESR等方法对催化剂进行了表征,并研究了其在可见下光催化降解甲醛气体的性能和催化机理。结果表明,硅藻土和BiOBr的质量比为1.5时,所制得的复合光催化剂对甲醛气体的光催化降解效率最高,3 h可达89.6%,其应用的最适宜空气相对湿度为45%。经过4个循环的重复使用后,复合光催化剂的催化性能衰减很小。复合光催化剂降解甲醛气体的主要活性物种为羟基自由基和光生空穴,其高催化性能主要得益于硅藻土吸附富集了低浓度甲醛气体以及RGO增加了光生载流子的分离效率。本研究结果可为开发可见下光催化降解甲醛气体工艺开发提供参考。
A photocatalyst composed of BiOBr,reduced graphene oxide(RGO)and diatomite was successfully prepared by solvothermal method,the composite was characterized by XRD,SEM,XPS,UV-Vis,BET and ESR.The performance and catalytic mechanism of its catalytic degradation of formaldehyde gas under visible light were also studied.When the mass ratio of diatomite and BiOBr was 1.5,the prepared composite photocatalyst had the highest photocatalytic degradation efficiency for formaldehyde gas,which can reach 89.6%in 3 hours,and the most suitable air relative humidity for its application was 45%.After 4 cycles of repeated use,the photocatalytic performance of composite photocatalyst decayed very little.The main active species of the composite photocatalyst to degrade formaldehyde were hydroxyl radicals and photo-generated holes.The high photocatalytic performance of the composite photocatalyst was due to the adsorption and enrichment of low-concentration gaseous formaldehyde by diatomite,and the RGO increased the separation efficiency of photo-generated carriers of the photocatalyst.The results of this study can provide a reference for the photocatalytic degradation of formaldehyde gas under visible light.
作者
令玉林
周建红
安俊霖
曾伯平
肖菡曦
肖烨
戴友芝
LING Yulin;ZHOU Jianhong;AN Junlin;ZENG Boping;XIAO Hanxi;XIAO Ye;DAI Youzhi(College of Resources and Environment,Zunyi Normal University,Zunyi 563006,China;School of Biological and Agricultural Science and Technology,Zunyi Normal University,Zunyi 563006,China;College of Environment and Resources,Xiangtan University,Xiangtan 411105,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2022年第5期1558-1568,共11页
Chinese Journal of Environmental Engineering
基金
合肥师范学院博士基金项目(遵师BS[2021]07号,遵师BS[2020]02号)
合肥市市校联合科技研发资金项目(遵市科合HZ字262号,遵市科合HZ字268号)
大学生创新训练计划项目(202110664022)
赤水河流域环境保护与山地农业发展人才基地开放基金。
关键词
光催化
降解
甲醛气体
复合光催化剂
BiOBr
硅藻土
photocatalysis
degradation
formaldehyde gas
composite photocatalyst
BiOBr
diatomite
