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Coupling N-doping and confined Co3O4 on carbon nanotubes by polydopamine coating strategy for pleiotropic water purification

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Abstract

The development of effective and sustainable solutions for pleiotropic water purification becomes urgent and attractive. Heterogeneous Fenton-like catalysts for activation of peroxymonosulfate (PMS) to purify organic wastewater show great promise. In this work, by tuning metal loading with an in-situ polydopamine coating strategy, oxygen vacancy-enriched Co3O4 loading on N-doped carbon nanotubes (CNTs) were constructed to enhance PMS activation efficiency for pollutants degradation. Impressively, the obtained modified CNTs afford a well-developed N-containing network structure, which is further endowed with abundant Co(II)/Co(III) redox cycles and significant metal–carbon interactions. In particular, the surface N doping in CNTs might induce the oriented enrichment of pollutants around the catalyst, which reduces the migration distance and correspondingly improves the utilization of reactive oxidative species. The electron transfer efficiency of the catalyst can be further improved by incorporating oxygen vacancy-enriched Co3O4. The performance results show that the optimal NC/Co-1 could mineralize 20 × 10−6 of bisphenol A (BPA) by almost 98% in 8 min. A low reaction activation energy (26.05 kJ·mol−1) in BPA degradation was demonstrated by the NC/Co-1. More importantly, NC/Co-1 can inherit excellent degradation performance towards oxytetracycline, 2, 4-dichlorophenol, and tetracycline, showing wide practical flexibility. In addition, by virtue of the photothermal conversion property, NC/Co-1 achieves an additive function for interfacial solar water evaporation (1.84 kg·m−2·h−1, 112.51%), showing impressive potential for clean water recovery under complicated environmental pollution conditions.

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摘要

开发有效和可持续的多效性水净化治理方案是紧迫并吸引人的. 非均相芬顿类催化剂催化过氧单硫酸盐(PMS)用于净化有机废水具有广阔的应用前景. 本研究通过原位聚多巴胺包覆策略并调控金属负载, 构建了富氧空位的Co3O4负载在N掺杂碳纳米管(CNTs)上, 以获得更高的PMS活化效率和污染物降解性能. 令人印象深刻的是, 获得的碳纳米管具有发达的含N的网络结构, 并表现出Co(II)/Co(III)非常规氧化还原循环对和显著的金属-碳相互作用. 尤其, 碳纳米管中N的表面掺杂诱导了催化剂周围污染物的定向富集, 减少了迁移距离, 提高了活性氧化物质的利用率。富氧Co3O4的引入提高了催化剂的电子传递效率. 结果表明, 最优的NC/Co-1在8 min内矿化双酚A (BPA)的效率接近98%, 并具有一个较低的反应活化能(26.05 kJ·mol−1). NC/Co-1对土霉素, 2,4 -二氯酚和四环素具有优良的降解性能。此外, 凭借光热转换特性, NC/Co-1展现了界面太阳能水蒸发的附加功能(1.84 kg·m−2·h−1, 112.5%), 显示出材料在复杂环境污染条件下良好的清洁水回收潜力.

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Acknowledgments

This work was financially supported by the China National Natural Science Foundation (No. 201808085), the National Key Research and Development Program of China (No. 2022YFB3504100), Jiangsu Provincial Founds for Young Scholars (No. BK20190961), the Natural Science Foundation of Jiangsu Higher Education Institutions of China (No. 22KJB610012), and the International Cooperation Foundation for the Chunhui Plan Program of Ministry of Education of China (No. HZKY20220136). We are appreciative of the support of characterizations from Instrumental Analysis Center, Jiangsu University of Science and Technology.

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  1. Wen-Long Tu and Gang Wang have contributed equally to this work.

Authors and Affiliations

  1. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Wen-Long Tu, Gang Wang, Yue Zhang, Hong-Yang Zhu, Rong-Rong Du, Hong-Yao Zhao, Sheng Tang & Fu Yang

  2. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Jun Yang

  3. School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252000, China

    Zeng-Jing Guo

  4. School of Environmental Science and Engineering, Nanjing Tech University, Nanjing, 211816, China

    Cheng-Zhang Zhu

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Tu, WL., Wang, G., Zhang, Y. et al. Coupling N-doping and confined Co3O4 on carbon nanotubes by polydopamine coating strategy for pleiotropic water purification. Rare Met. (2024). https://doi.org/10.1007/s12598-024-02661-5

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