Synergistic mechanism of disparate surface hydroxyls and oxygen vacancies towards peroxymonosulfate activation for durable water decontamination

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Shuyu Wang, Zhonglin Chen, Lianpeng Sun, Pengwei Yan, Wenyu Wu, Jing Kang, Jimin Shen, Binyuan Wang, Shengxin Zhao, Yabin Li
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引用次数: 0

Abstract

Constructing oxygen vacancies (OVs) and surface hydroxyls are efficient methods in catalyst modification engineering. However, their unclear interrelationships limit the design of more efficient catalysts with dual active centers. For this purpose, we concurrently constructed the OVs and surface hydroxyls by Ni2+ doping α-FeOOH. The isomorphic substitution of Ni2+ to Fe3+ induced remarkable formation of OVs with the crystalline phase transformed to α-Fe2O3 and partial structure hydroxyls synchronously preserved. α-Fe1.6Ni0.4O3H showed better performance in activating peroxymonosulfate (PMS) to degrade clothianidin (CLO) than α-FeOOH and α-Fe2O3, and almost complete removal of CLO within 30 min was achieved. Various in situ experiments and DFT calculations demonstrated that the hydrolyzed hydroxyls were prone to fill the OVs, leading to the poisoning of active sites, and replacing it is the necessary pathway for surface-complexation of PMS. The structure hydroxyls were verified to alleviate the occupation of hydrolyzed hydroxyls on OVs by hydrogen-bonding interaction, thus forming sustainable OVs and enhancing the PMS adsorption. Besides, OVs and structure hydroxyls synergistically regulated the spin state and enhanced the electron transfer ability of surrounding Fe sites, promoting PMS activation. Furthermore, α-Fe1.6Ni0.4O3H/PMS system has good environmental tolerance, especially for common oxygenated anions (SO42-, NO3 and HCO3). Coupling with membrane filtration further improved its practicality, and the coupling system achieved excellent removal of CLO, UV254 and DOM in raw water and filtered water. These findings lay a foundation for identifying the role of OVs and surface hydroxyls, as so to give new inspiration for developing efficient catalysts to facilitate PMS activation, and also propose a superior strategy for practical application of the catalytic system in water treatment.

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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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