Vacancies and sea urchin structure protect cobalt manganese spinel from anion poisoning in peroxymonosulfate activation

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

npj Clean Water Pub Date : 2025-02-19 DOI:10.1038/s41545-025-00444-8

Hui Jia, Rumeng Liu, Tenglong Huang, Fulin Wang, Shanshan Dong, Huihui Dai, Zhenxing Zeng, Dingding Tang, Xiaodong Wang, Suhua Chen

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Abstract

Peroxymonosulfate (PMS) activation by cobalt manganese spinel (Co-Mn) is always unsatisfactory due to the interference of co-existing anions in water. In this study, we used a sulfate-modification strategy to prepare a sea urchin-like Co-Mn catalyst (CoMn₂O₄-S) with abundant oxygen vacancies for counteracting the interference of anions in pollutant degradation. Compared with the conventional Co-Mn catalyst (CoMn₂O₄), CoMn₂O₄-S exhibited higher resistance to poisoning of NO₃⁻, Cl⁻, and SO₄²⁻ in PMS activation involved phenol degradation. Additionally, H₂PO₄⁻ could even enhance phenol degradation by 150.2% for CoMn₂O₄-S/PMS system, in contrast to its induced 18.5% inhibition to CoMn₂O₄/PMS system. It was demonstrated that vacancies and sea urchin structure alleviated catalyst agglomeration for preserving catalytic sites and promoted catalyst surface modulation for radical diffusion, contributing to the enhanced stability in saline water. This work provides a facile strategy for overcoming the negative effects of co-existing anions on heterogeneous PMS-activation based water treatment.

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空位和海胆结构保护钴锰尖晶石在过氧单硫酸盐活化中免受阴离子中毒

由于水中共存阴离子的干扰，钴锰尖晶石（Co-Mn）活化过氧单硫酸盐（PMS）的效果往往不理想。在本研究中，我们采用硫酸盐改性策略制备了一种具有丰富氧空位的海胆样Co-Mn催化剂（CoMn2O4-S），以抵消阴离子对污染物降解的干扰。与传统Co-Mn催化剂（CoMn2O4）相比，CoMn2O4- s在PMS活化过程中对NO3−、Cl−和SO42−具有更高的抗性。此外，H2PO4−对CoMn2O4- s /PMS体系的苯酚降解率提高了150.2%，而对CoMn2O4/PMS体系的抑制率为18.5%。结果表明，空位和海胆结构减轻了催化剂团聚以保留催化位点，促进了催化剂表面调节以促进自由基扩散，从而提高了催化剂在盐水中的稳定性。这项工作为克服共存阴离子对非均相pms活化水处理的负面影响提供了一种简便的策略。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.