化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (10) : 226-229. DOI: 10.19817/j.cnki.issn1006-3536.2022.10.043

科学研究

ZnO@CeO₂中空微球光催化剂的合成

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Preparation of hollow spherical ZnO@CeO₂ composite photocatalyst

Chen Liang, Dong Rulin, Chen Zhidong, Jin Changchun

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Received		Published
2021-06-29		2022-10-20
Issue Date	Revised Date
2022-11-01	2021-06-29

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摘要

采用两步法合成了具有中空特征的ZnO@CeO₂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CeO₂。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CeO₂修饰的纳米晶中空ZnO微球进行了表征。结果表明:ZnO@CeO₂复合光催化剂的光催化活性与CeO₂复合量有关。当CeO₂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CeO₂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。

Abstract

Two-step process was adopted to synthesize ZnO@CeO₂ 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 CeO₂ was modified onto the surface of ZnO nanocrystals by chemical bath deposition and calcination precess with cerium nitrate hexahydrate as the cerium source.The CeO₂ 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@CeO₂ composite photocatalyst depending on the molar fraction of CeO₂.When the molar fraction of CeO₂ 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 CeO₂ 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

Key words

zinc oxide / cerium oxide / heterojunction / photocatalysis

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ZnO@CeO₂中空微球光催化剂的合成[J]. 化工新型材料, 2022, 50(10): 226-229 DOI:10.19817/j.cnki.issn1006-3536.2022.10.043

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