ZnNiAl-LDH/Bi_(2)WO_(6)/Cu_(2)O光催化剂的制备及降解性能的研究  

Preparation and photodegradation performance of ZnNiAl-LDH/Bi_(2)WO_(6)/Cu_(2)O

作　　者：赵强[1,2] 李淑英 郭智楠 王俊丽[1,3] 许琳 郭永[1,2] ZHAO Qiang;LI Shuying;GUO Zhinan;WANG Junli;XU Lin;GUO Yong(School of Chemistry and Chemical Engineering,Shanxi Datong University,Datong 037009;Shanxi Province Union Laboratory of Clean Energy Materials,Datong 037009;Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education,Datong 037009)

机构地区：[1]山西大同大学化学与化工学院,大同037009 [2]山西省清洁能源材料联合实验室,大同037009 [3]煤基生态碳汇技术教育部工程研究中心,大同037009

出　　处：《环境科学学报》2024年第2期93-103,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21908135);山西省自然科学基金(No.201901D111308,201901D211435);山西省留学回国人员科技活动项目择优资助(No.2019-20);山西大同大学博士科研启动基金(No.2018-B-01,2020-B-02);山西大同大学研究生创新基金(No.22CX17);山西省大学生创新创业训练计划项目(No.20220807)。

摘　　要：采用共沉淀法合成了一系列不同比例ZnNiAl-LDH和Bi_(2)WO_(6)的ZnNiAl-LDH/Bi_(2)WO_(6)/Cu_(2)O复合光催化剂,并通过四环素(TC)降解实验对其光催化性能进行了研究.同时,采用SEM、TEM、HRTEM、XRD、FTIR、UV-Vis、XPS、PL和EPR等方法研究了光催化剂的结构和光学性能.降解实验结果表明:与纯ZnNiAl-LDH、Bi_(2)WO_(6)和Cu_(2)O相比,ZnNiAl-LDH/Bi_(2)WO_(6)/Cu_(2)O复合光催化剂不仅对四环素具有较高的吸附和降解能力,而且能够降低光生电子-空穴对的复合率.其中,5%ZnNiAl-LDH/15%Bi_(2)WO_(6)/80%Cu_(2)O复合光催化剂在可见光条件下对TC的降解效率最高,100 min内TC的降解率可达93%.高光降解性能归因于在Cu_(2)O与Bi_(2)WO_(6)及ZnNiAl-LDH之间存在高效的界面电荷转移和协同作用,从而提高了光生电子空穴对的分离效率.A series of ZnNiAl-LDH/Bi_(2)WO_(6)/Cu_(2)O composite photocatalysts with different ratios of ZnNiAl-LDH and Bi_(2)WO_(6)were synthesised by coprecipitation method and the photocatalytic properties were investigated by tetracycline(TC)degradation experiments.The structural and optical properties of these photocatalysts were investigated by SEM,TEM,HRTEM,XRD,FTIR,UV-Vis,XPS,PL and EPR.The results of the degradation experiments showed that the ZnNiAl-LDH/Bi_(2)WO_(6)/Cu_(2)O composite photocatalysts not only possessed higher adsorption and degradation ability for tetracycline,but also were able to reduce the complexation rate of photogenerated electron-hole pairs,compared with pure ZnNiAl-LDH,Bi_(2)WO_(6)and Cu_(2)O.Among them,the 5%ZnNiAl-LDH/15%Bi_(2)WO_(6)/80%Cu_(2)O composite photocatalysts showed the highest degradation efficiency of TC under visible light conditions,and the degradation rate of TC could reach 93%in 100 min.The high photodegradation efficiency of photocatalysts could be ascribed to the efficient interfacial charge transfer at the composite and synergistic effect between Cu_(2)O and Bi_(2)WO_(6),ZnNiAl-LDH,which resulted in the enhanced separation efficiency of photogenerated electron-hole pairs.

关 键 词：ZnNiAl-LDH Bi_(2)WO_(6) Cu_(2)O 四环素(TC) 光催化降解 

分 类 号：O643[理学—物理化学] X703[理学—化学]