Increased structural defects of graphene oxide compromised reductive capacity of ZVI towards hexavalent chromium

doi:10.1016/j.chemosphere.2021.130308

	Increased structural defects of graphene oxide compromised reductive capacity of ZVI towards hexavalent chromium
	Yang, Xianni 1,5; Hu, Linlin 2; Bai, Jing 3; Mao, Xiaoyun 4; Chen, Xian 4; Wang, Xiaozhi 1,5; Wang, Shengsen 1,3,5
刊名	CHEMOSPHERE
	2021-08-01
卷号	277 页码:8
关键词	Heavy metals Zerovalent iron Electron transfer Graphene oxide Irradiation Oxygen content
ISSN号	0045-6535
DOI	10.1016/j.chemosphere.2021.130308
通讯作者	Wang, Xiaozhi(xzwang@yzu.edu.cn) ; Wang, Shengsen(wangss@yzu.edu.cn)
英文摘要	Graphene oxide (GO) was treated with irradiation beams to understand the defective degree of carbon structure of GO in relation to electron transfer property of impregnated zerovalent iron (ZVI). The GO-supported ZVI (ZVI/GO) was synthesized and then characterized by an X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The results showed that the oxygen-bearing functional groups, oxygen content and structural disorder were increased as a function of irradiation beam intensity. ZVI was dominant in the composites, but proportion of iron oxide increased with greater oxygen content. Batch sorption revealed that Cr(VI) removal decreased from 20.11 g kg(-1) to 2.30 g.kg(-1) as solution pH rose from 3 to 9. Cr(VI) removal capacity was 26.39 g.kg(-1), 23.12 g.kg(-1) and 12.35 g.kg(-1) for ZVI/GO(0), ZVI/GO(12.3) and ZVI/GO(36.9), respectively. The reduction capacity of sorbents followed similar trends as Cr(VI) sorption as per desorption experiment, which accounted for a major Cr(VI) detoxification mechanism by ZVI/GO composites. The electrochemical tests demonstrated that unfavorable electron transfer rate of ZVI/GO composites was aggravated by greater structural disorder of GO. Thus, higher dose of irradiations could create more disorder in graphitic carbon and promote oxidation of ZVI, which hindered Cr(VI) reduction. (C) 2021 Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[41977117] ; National Natural Science Foundation of China[41771349] ; National Natural Science Foundation of China[41977085] ; National Natural Science Foundation of China[42007084] ; Qing Lan Project of Yangzhou University ; High-level Talent Support Plan of Yangzhou University ; Science and Technology Project of Guangdong Province[2017A050501029]
WOS关键词	CR(VI) REMOVAL ; ADSORPTION ; BIOCHAR ; WATER ; TRANSFORMATION ; CHROMATE ; VI
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000648342100075
资助机构	National Natural Science Foundation of China ; Qing Lan Project of Yangzhou University ; High-level Talent Support Plan of Yangzhou University ; Science and Technology Project of Guangdong Province
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/137256]
专题	中国科学院近代物理研究所
通讯作者	Wang, Xiaozhi; Wang, Shengsen
作者单位	1.Yangzhou Univ, Joint Int Res Lab Agr & Agriprod Safety, Minist Educ China, Yangzhou 225127, Jiangsu, Peoples R China 2.Shandong Agr Univ, Coll Water Conservancy & Civil Engn, Tai An 271018, Shandong, Peoples R China 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 4.South China Agr Univ, Guangdong Prov Key Lab Ecocircular Agr, Guangzhou 510642, Guangdong, Peoples R China 5.Yangzhou Univ, Coll Environm Sci & Engn, Minist Educ China, Yangzhou 225127, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Yang, Xianni,Hu, Linlin,Bai, Jing,et al. Increased structural defects of graphene oxide compromised reductive capacity of ZVI towards hexavalent chromium[J]. CHEMOSPHERE,2021,277:8.
APA	Yang, Xianni.,Hu, Linlin.,Bai, Jing.,Mao, Xiaoyun.,Chen, Xian.,...&Wang, Shengsen.(2021).Increased structural defects of graphene oxide compromised reductive capacity of ZVI towards hexavalent chromium.CHEMOSPHERE,277,8.
MLA	Yang, Xianni,et al."Increased structural defects of graphene oxide compromised reductive capacity of ZVI towards hexavalent chromium".CHEMOSPHERE 277(2021):8.