化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (9) : 105-110. DOI: 10.19817/j.cnki.issn 1006-3536.2020.09.023

新材料与新技术

Ag₂CrO₄/ZnO复合光催化剂的制备及光催化性能研究

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Preparation and photocatalytic performance of Ag₂CrO₄/ZnO composite photocatalyst

Huang Fengping¹, Li Chunhua¹, Xin Meng¹, Liu Boxue¹, Zhou Xinmin¹, Ding Li²

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Received		Published
2019-05-16		2020-09-20
Issue Date	Revised Date
2020-10-20	2019-05-16

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摘要

采用沉淀法制备具有高催化性能的Ag₂CrO₄/ZnO复合光催化剂。通过X射线衍射仪、扫描电子显微镜、透射电子显微镜、X射线光电子能谱仪、紫外-可见分光光度计等测试手段对催化剂的结构和形貌进行了表征。利用可见光催化降解有机染料罗丹明B(RhB),考察复合光催化剂的光催化性能及稳定性。结果表明:Ag₂CrO₄均匀地附着在ZnO纳米棒上,当Ag₂CrO₄与ZnO摩尔比为1:2时催化剂表现出最优的光催化性能,90min内对RhB的降解率可达86%。经过5次循环实验,复合光催化剂对RhB的降解率仍可达82%,而纯Ag₂CrO₄降解率仅为24%。Ag₂CrO₄/ZnO复合光催化剂表现出的优异光催化活性及稳定性,主要由于Ag₂CrO₄和ZnO之间稳定地负载,能有效分离光生电子和空穴,降低了活性位点,提高了催化剂的光催化活性和稳定性。

Abstract

Ag₂CrO₄/ZnO composite photocatalyst with high catalytic performance was prepared by precipitation method.The structure and morphology of the catalyst were characterized by XRD,SEM,TEM,XPS and UV-Vis.The photocatalytic performance and stability of the photocatalyst were investigated by visible light photocatalytic degradation of organic dyes (RhB).The results shown that Ag₂CrO₄ was uniformly attached to ZnO nanorods.When the composite molar ratio of Ag₂CrO₄ to ZnO is 1:2,the catalyst exhibits the best photocatalytic performance,and the degradation rate of RhB can reach 86% within 90min.After 5 cycles of experiments,the degradation rate of RhB was still up to 82%,while pure Ag₂CrO₄ was only 24%.The research shown that the excellent photocatalytic activity and stability of Ag₂CrO₄/ZnO were mainly due to the stable loading between Ag₂CrO₄ and ZnO,which can effectively separate photogenerated electrons and holes,reduced the active sites and improved the photocatalytic activity and stability of the catalyst.

关键词

沉淀法 / 光催化性能 / 氧化锌 / 铬酸银 / 复合光催化剂

Key words

precipitation method / photocatalytic performance / ZnO / Ag₂CrO₄ / composite photocatalyst

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Ag₂CrO₄/ZnO复合光催化剂的制备及光催化性能研究[J]. 化工新型材料, 2020, 48(9): 105-110 DOI:10.19817/j.cnki.issn 1006-3536.2020.09.023

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