MoS2-intercalated montmorillonite nanostructure coupled with N-doped carbon-encapsulated CoMn bimetallic nanocage: A stability-enhancing strategy for peroxymonosulfate activation to pollutant degradation

文献类型： 外文期刊

第一作者： Liu, Xudong

作者： Liu, Xudong;Xie, Zhinan;Li, Min;Mu, Jiarong;Wang, Weihong;Du, Chunfang;Su, Yiguo;Liu, Xudong;Wang, Weihong

作者机构：

关键词： Montmorillonite; MoS2; Interpolation; Peroxymonosulfate; S-vacancy

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 3 期

页码：

收录情况： SCI

摘要： Insufficient stability and catalytic activity are key limitations for the enhancement of peroxymonosulfate (PMS) activation performance in environmental remediation applications. Herein, the coupling of MoS2 intercalated montmorillonite (MoS2/Mt-5) with N-doped carbon-encapsulated CoMn bimetallic nanocages (CMNC) composite was constructed (MM/CMNC-15). Experimental results demonstrated that MM/CMNC-15 can completely degrade tetracycline (TC) within 30 min and exhibits robust resistance to environmental interference. Moreover, after 10 cycles, MM/CMNC-15 maintained a TC degradation efficiency exceeding 92.3 %, whereas the degradation efficiency decreased from 95.2 % to 61.0 % after 5 cycles with the physically mixed sample and its descent rate approximately 8.8 times faster than the MM/CMNC-15. In pilot experiment (72 L), MM/CMNC-15 demonstrated a 95.8 % degradation efficiency for 210 mg/L TC wastewater within 8 h. Long-lasting and efficient degradation of TC through PMS activation can be attributed to three points: (1) The intercalation structure of MoS2/Mt-5 effectively mitigates the oxidation loss of MoS2 and CMNC while maintaining sustained interlayer reactivity; (2) Accelerated intermetallic redox cycling in the MM/CMNC-15/PMS system; (3) Abundant surface hydroxyl groups and sulfur vacancies increase the exposure of metal active sites. Additionally, quenching and probe experiments and electron paramagnetic resonance (EPR) tests results demonstrated that center dot OH and SO4 center dot- were the dominant reactive oxygen species for the degradation of TC in the MM/CMNC-15/PMS system. This work not only provides a novel strategy for designing highly stable catalysts, but also demonstrates significant potential for the large-scale treatment of organic wastewater.

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