Oxygen-vacancy-rich N-doped NiFe2O4 activates peroxymonosulfate for efficient water purification

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-06-19 DOI:10.1016/j.seppur.2025.134061

Donglei Fu, Zhengxiong Zhao, Pengwei Yan, Zhonglin Chen, Jinxiang Zuo

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引用次数: 0

Abstract

An efficient catalyst with abundant oxygen vacancies (OVs) was obtained via nitrogen (N) doping NiFe₂O₄ for peroxymonosulfate (PMS) activation to achieve durable water purification. The N-NiFe₂O₄ activated process enhanced the formation of SO₄⁻ and ·OH, thus endowing the system with high decontamination performance compared to pristine NiFe₂O₄. The influence of complex aquatic matrices on the N-NiFe₂O₄/PMS system towards 2,4-dichlorophenoxyacetic acid (2,4-D) removal was investigated in detail. The systematic evaluation revealed that the 5.0 % N-doped NiFe₂O₄/PMS system demonstrated optimal catalytic activity, achieving an 86.9 % removal efficiency of 2,4-D within 15 min. Radical quenching experiments identified SO₄⁻ and ·OH were predominantly responsible for 2,4-D degradation. According to the in situ tests and Density functional theory (DFT) calculation, the constructed OVs on N-NiFe₂O₄ greatly promoted the adsorption of PMS, and next served as reactive sites for electron transfer via the Fe³⁺ or Ni²⁺ sites, which further activated PMS for the formation of SO₄⁻. In short, this work gives an effective strategy to prepare high-performance catalysts for durable water purification system construction.

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富氧空位n掺杂NiFe2O4活化过氧单硫酸盐高效水净化

通过氮(N)掺杂NiFe2O4，获得了一种具有丰富氧空位（OVs）的高效催化剂，用于过氧单硫酸盐（PMS）的活化，以实现持久的水净化。N-NiFe2O4活化过程促进了SO4−和·OH的形成，从而使系统与原始NiFe2O4相比具有更高的去污性能。研究了复合水生基质对N-NiFe2O4/PMS体系去除2,4-二氯苯氧乙酸（2,4- d）的影响。系统评价表明，5.0 % n掺杂的NiFe2O4/PMS体系表现出最佳的催化活性，在15 min内达到86.9 %的2,4- d去除率。自由基猝灭实验表明，SO4−和·OH对2,4- d的降解起主要作用。根据原位实验和密度泛函理论（DFT）计算，在N-NiFe2O4上构建的OVs极大地促进了PMS的吸附，然后通过Fe3+或Ni2+位点作为电子转移的反应位点，进一步激活PMS形成SO4−。总之，本工作为制备高性能的水净化系统催化剂提供了有效的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.