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On-line Access: 2023-08-18

Received: 2022-10-19

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 ORCID:

Zhanmei ZHANG

https://orcid.org/0000-0001-7259-8011

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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.8 P.710-721

http://doi.org/10.1631/jzus.A2200490


Co3O4-ZnO/rGO catalyst preparation and rhodamine B degradation by sulfate radical photocatalysis


Author(s):  Zhanmei ZHANG, Yi ZHANG, Xilin CHEN, Ziran HUANG, Zuqin ZOU, Huaili ZHENG

Affiliation(s):  Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; more

Corresponding email(s):   zhanmei2003@126.com

Key Words:  Co3O4-ZnO/rGO catalyst, Rhodamine B (RhB), Heterojunction, Photocatalysis, Peroxymonosulfate (PMS)


Zhanmei ZHANG, Yi ZHANG, Xilin CHEN, Ziran HUANG, Zuqin ZOU, Huaili ZHENG. Co3O4-ZnO/rGO catalyst preparation and rhodamine B degradation by sulfate radical photocatalysis[J]. Journal of Zhejiang University Science A, 2023, 24(8): 710-721.

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author="Zhanmei ZHANG, Yi ZHANG, Xilin CHEN, Ziran HUANG, Zuqin ZOU, Huaili ZHENG",
journal="Journal of Zhejiang University Science A",
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pages="710-721",
year="2023",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2200490"
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%T Co3O4-ZnO/rGO catalyst preparation and rhodamine B degradation by sulfate radical photocatalysis
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%A Yi ZHANG
%A Xilin CHEN
%A Ziran HUANG
%A Zuqin ZOU
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A1 - Xilin CHEN
A1 - Ziran HUANG
A1 - Zuqin ZOU
A1 - Huaili ZHENG
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Abstract: 
The development of a combined photocatalytic system with peroxymonosulfate (PMS) has great potential applications in the degradation and treatment of aqueous organic pollutants. Herein, a Co3O4-ZnO/rGO was prepared by a hydrothermal method using cobalt acetate, zinc acetate, and reduced graphene oxide (rGO) as the main raw materials. The physical and chemical characteristics of the obtained catalyst were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR). The photocatalytic features and capacities of the catalytic materials to activate PMS were investigated. Co3O4-ZnO/rGO exhibited stronger photocatalytic activity and ability to activate PMS than Co3O4/rGO or ZnO/rGO, and significantly improved the ability of PMS and photocatalysis to synergistically degrade rhodamine B (RhB), with a degradation rate of 90.40% within 40 min. The mechanism of RhB degradation was proposed based on characterization of materials, evaluation of RhB degradation efficiency, and analysis of the active species involved. The unique particle/sheet structure of Co3O4-ZnO/rGO provides a large number of active sites, and the formation of heterojunctions between Co3O4 and ZnO improves carrier separation and transport in the reaction system. Our study offers a reference for designing more effective heterojunction catalysts based on the combination of PMS and photocatalytic technology.

Co3O4-ZnO/rGO催化剂的制备及在硫酸盐自由基光催化降解罗丹明B的应用

作者:张占梅1,2,张毅1,陈熙琳1,黄紫然1,邹祖琴1,郑怀礼3
机构:1重庆交通大学,水利水运工程教育部重点实验室,中国重庆,400074;2国家内河航道整治工程技术研究中心,中国重庆,400074;3重庆大学,环境与生态学院,中国重庆,400044
目的:罗丹明B(RhB)作为一种合成染料被广泛应用在工业生产中,若不及时处理则会在自然界累积并对环境造成伤害。本文旨在制备出一种Co3O4-ZnO/rGO催化剂,并通过构建过硫酸盐光催化体系以实现RhB的降解。此外,本文还探究制备条件(水热时间、rGO掺杂量和煅烧温度等)对材料催化性能的影响,并提出可能的反应机理。
创新点:1.通过水热法制备Co3O4-ZnO/rGO,并探究其制备条件(水热时间、rGO掺杂量和煅烧温度等)对催化剂性能的影响;2.构建过硫酸盐光催化氧化体系实现了对RhB污染物的高效降解。
方法:1.通过实验分析,推导Co3O4-ZnO/rGO制备条件对其催化性能的影响;2.通过表征分析,对Co3O4-ZnO/rGO中各元素组成及表面形态进行分析;3.通过实验分析UV/Co3O4-ZnO/rGO/PMS对RhB的降解效率。4.通过反应前后表征对比及UV-Vis等手段探究催化氧化反应机制,并提出可能的反应机理。
结论:1.Co3O4-ZnO/rGO制备过程中rGO掺杂量及煅烧温度对催化性能的影响较大。2.所构建的UV/Co3O4-ZnO/rGO/PMS体系对RhB具有良好的去除效率;在主要自由基SO4??和?OH的作用下,RhB去除率在40min内可达90.40%。3.Co3O4-ZnO/rGO相比Co3O4/rGO及ZnO/rGO有更好的催化性能,这主要是因为Co3O4和ZnO之间异质结的生成促进了电子空穴对的重组。

关键词:Co3O4-ZnO/rGO催化剂;罗丹明B;异质结;光催化;过硫酸盐

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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