Degradation of atrazine by Ni-doped sulfidated microscale zero-valent iron: Mechanistic insights for enhanced reactivity and selectivity

doi:10.1016/j.cej.2022.135120

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	Degradation of atrazine by Ni-doped sulfidated microscale zero-valent iron: Mechanistic insights for enhanced reactivity and selectivity
	Tian, Fangming 1; Tang, Jiaojiao 1; Zeng, Jie 1; Luo, Zhen 1; Zhang, Lin 1; Tang, Fenglin 1; Han, Zhiyong 2; Yang, Xiupei 1
刊名	Chemical Engineering Journal
	2022-05-01
卷号	435
关键词	Groundwater Herbicides Hydrogen Magnetite Pyrites Sulfur compounds Enhanced reactivity Hydrogen evolution reactions Iron Particles Mechanistics Microscale zero-valent iron Ni-doped Over water Removal rate Sulfidation Zero-valent iron
ISSN号	1385-8947
DOI	10.1016/j.cej.2022.135120
英文摘要	Sulfidation of microscale zero-valent iron particles (S/mZVI) has been considered as a general means to enhance its reactivity and selectivity. However, further improving of S/mZVI over water while still maintaining high reactivity with target contaminants is still a great challenge. In this study, Ni and Na2S were chosen as the catalyst and sulfidation regent, respectively, to synthesize three different kinds of nickel-sulfidated composite mZVI particles (NSC-mZVI), namely, post-sulfidation (Ni/mZVI-S), pre-sulfidation (S/mZVI-Ni), and co-sulfidation (Ni/S-mZVI), by adjusting the sequence of nickel doping and sulfidation. The reactivity and selectivity performance of NSC-mZVI toward atrazine (ATZ) in groundwater were compared, and the underlying mechanisms for the enhancement effect of ATZ and selectivity were also elucidated. Compared with S/mZVI, Ni/S-mZVI not only further increased the ATZ removal rate, but also reduced the hydrogen accumulation, which simultaneously improved the reactivity and selectivity of target contaminants. The enhanced removal rate of ATZ by Ni/S-mZVI could be ascribed to the generated atom hydrogen and the direct reduction of Fe0 core mediated by the electron transfer of FeS2 and Fe3O4. Meanwhile, the reduced hydrogen evolution reaction (HER) of Ni/S-mZVI can be explained by that Fe oxides conducting minor electrons mediated HER. The pH value of Ni/S-mZVI eventually reached 5.1 with high release of Fe2+. Overall, bimetallic modification of S/mZVI is a promising strategy to improve its reactivity, selectivity, and longevity for groundwater remediation. © 2022 Elsevier B.V.
WOS研究方向	Engineering
语种	英语
出版者	Elsevier B.V.
WOS记录号	WOS:000773616700004
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/157992]
专题	石油化工学院
作者单位	1.College of Chemistry and Chemical Engineering, Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong; 637000, China; 2.Department of Environmental Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Tian, Fangming,Tang, Jiaojiao,Zeng, Jie,et al. Degradation of atrazine by Ni-doped sulfidated microscale zero-valent iron: Mechanistic insights for enhanced reactivity and selectivity[J]. Chemical Engineering Journal,2022,435.
APA	Tian, Fangming.,Tang, Jiaojiao.,Zeng, Jie.,Luo, Zhen.,Zhang, Lin.,...&Yang, Xiupei.(2022).Degradation of atrazine by Ni-doped sulfidated microscale zero-valent iron: Mechanistic insights for enhanced reactivity and selectivity.Chemical Engineering Journal,435.
MLA	Tian, Fangming,et al."Degradation of atrazine by Ni-doped sulfidated microscale zero-valent iron: Mechanistic insights for enhanced reactivity and selectivity".Chemical Engineering Journal 435(2022).