可见光响应的ZnO/ZnFe2O4复合光催化剂的合成及磁性研究  

Synthesis and Magnetic Properties of ZnO/ZnFe2O4 Composite Photocatalyst in Visible Light Response

作　　者：廖伟秀 艾建平[1] 宋成叶 周泽华[1] 陈智琴[1] 杨艳玲 饶少卿 李文魁[1] LIAO Weixiu;Al Jianping;SONG Chengye;ZHOUZhehua;CHEN Zhiqin;YANG Yanling;RAO Shaoqing;LI Wenkui(Jiangxi Key Laboratory of Surface Engineering,Jiangxi Science and Technology Normal University,Nanchang 330038,Jiangxi,China)

机构地区：[1]江西科技师范大学江西省材料表面工程重点实验室

出　　处：《陶瓷学报》2019年第6期737-743,共7页Journal of Ceramics

基　　金：国家地区科学基金(51862009);江西科技师范大学博士科研启动基金(3000990340)

摘　　要：采用溶剂热法合成单纯的ZnO、ZnFe2O4以及ZnO/ZnFe2O4复合光催化剂,通过调控Zn2+/Fe3+摩尔浓度获得不同物相含量和形貌特征的ZnO/ZnFe2O4复合光催化剂,并利用XRD、SEM、DRS、低温氮吸附等多种手段对样品物化性能进行分析。以亚甲基蓝作为目标污染物,在500W氙灯照射下考察光催化剂对亚甲基蓝溶液的降解性能,结果表明:ZnO/ZnFe2O4复合光催化剂有一定的可见光催化降解活性,获得的ZnO/ZnFe2O4复合光催化剂降解活性优于单纯的ZnO和ZnFe2O4催化剂,其中Zn2+/Fe3+摩尔浓度比为5︰2时,210min后亚甲蓝的降解率可达到36%。同时,利用磁强计和施加外磁场的方式,研究ZnO/ZnFe2O4复合光催化剂的磁滞回线和分离回收性能,可知Zn2+/Fe3+摩尔比为5︰2时饱和磁化强度为27.6emu·g-1,具有很强的铁磁性,在外磁场作用下可以快速从悬浮溶液中分离出来。Pure ZnO,ZnFe2O4 and ZnO/ZnFe2O4 composite photocatalysts were synthesized by a simple solvent thermal method.Different phase content and morphological characteristics of ZnO/ZnFe2O4 composite photocatalyst were obtained by adjusting the molar ratio of Zn2+/Fe3+.The physical and chemical properties of the samples were analyzed by XRD,SEM,DRS and low-temperature nitrogen.The photocatalytic properties of the catalysts were studied using a 500 W xenon-lamp as an illumination device andmethylene blue as a target pollutant.The results show that the ZnO/ZnFe2O4 composite photocatalyst had somevisible light catalytic degration activity.When the Zn2+/Fe3+mole ratio was 5:2,the visible light catalytic degradation of the ZnO/ZnFe2O4 composite photocatalyst was superior to that of the pure ZnO and the ZnFe2O4,then after 210 min the degration rate of methylene blue can reach 36%.Meanwhile,the magnetic hysteresis loop and recovery properties of ZnO/ZnFe2O4 composite photocatalyst were studied by using magnetometer and an external magnetic field.It was known that the saturation magnetization intensity was 27.6 emu·g-1,which indicated strong ferromagnetism,when the Zn2+/Fe3+mole ratio was 5:2.Under the action of external magnetic field,it could be quickly separated from the suspension solution.

关 键 词：ZnO/ZnFe2O4 溶剂热合成 可见光响应 磁性 

分 类 号：TQ174.75[化学工程—陶瓷工业]