ZnO@CeO_(2)中空微球光催化剂的合成  

Preparation of hollow spherical ZnO@CeO_(2) composite photocatalyst

作　　者：陈亮[1] 董如林[1] 陈智栋[1] 金长春[1] Chen Liang;Dong Rulin;Chen Zhidong;Jin Changchun(School of Petrochemical Engineering,Changzhou University,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,Changzhou 213164)

机构地区：[1]常州大学石油化工学院,江苏省绿色催化材料与技术重点实验室,常州213164

出　　处：《化工新型材料》2022年第10期226-229,共4页New Chemical Materials

基　　金：江苏省绿色催化材料与技术实验室开放课题基金资助项目(BM2012110)。

摘　　要：采用两步法合成了具有中空特征的ZnO@CeO_(2)微球光催化剂。首先,以二水合乙酸锌、六亚甲基四胺、二水合柠檬酸三钠为原料,采用水热法和煅烧处理合成了纳米晶ZnO中空微球。然后以六水合硝酸铈为铈源,通过化学浴沉积和煅烧处理在ZnO晶粒表面修饰了纳米尺寸的CeO_(2)。使用X射线衍射(XRD)、扫描电镜(SEM)及透射电镜(TEM)分析方法对合成的CeO_(2)修饰的纳米晶中空ZnO微球进行了表征。结果表明:ZnO@CeO_(2)复合光催化剂的光催化活性与CeO_(2)复合量有关。当CeO_(2)复合的摩尔分数为1.5%时,复合光催化剂对亚甲基蓝表现了最佳的光催化降解效率。与纯ZnO相比,复合光催化剂在光照时间60min内对亚甲基蓝的降解效率提高了19.5%。经CeO_(2)修饰后ZnO催化剂活性的增强主要归因于复合形成的异质结对光生电子-空穴对复合的抑制作用。Two-step process was adopted to synthesize ZnO@CeO_(2) microsphere photocatalysts with hollow feature.First,nanocrystalline ZnO hollow microspheres were perpared by hydrothermal approach and subsequent calcination process,using zinc acetate dihydrate,hexamethylenetramine and trisodium citrate dihydrate as raw materials.Then,nanometer-sized CeO_(2)was modified onto the surface of ZnO nanocrystals by chemical bath deposition and calcination precess with cerium nitrate hexahydrate as the cerium source.The CeO_(2) modified nanocrystalline hollow ZnO microspheres were characterized by x-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The result shown the photocatalytic activity of ZnO@CeO_(2) composite photocatalyst depending on the molar fraction of CeO_(2).When the molar fraction of CeO_(2) was controled to be 1.5%,the composite photocatalyst shown the best photocatalytic efficiency for methylene blue(MB).The degradation efficiency of MB by the photocatalyst compared with pure ZnO was increased by 19.5%within 60 min of illumination time.The enhanced activity of ZnO catalysts modified by CeO_(2) was mainly attributed to the suppression effect of heterojunction on the recombination of photogenerated electron-hole pair.

关 键 词：氧化锌 氧化铈 异质结 光催化 

分 类 号：TB34[一般工业技术—材料科学与工程]