标题: New insights into engineering the core size and carbon shell thickness of Co@C core-shell catalysts for efficient and stable Fenton-like catalysis

作者: Ma, YS (Ma, Yongsong); Liu, XL (Liu, Xianglin); Zhao, MY (Zhao, Meiyu); Du, KF (Du, Kaifa); Yin, HY (Yin, Huayi); Mao, XH (Mao, Xuhui); Wang, DH (Wang, Dihua)

来源出版物: JOURNAL OF COLLOID AND INTERFACE SCIENCE 卷: 634 页: 521-534 DOI: 10.1016/j.jcis.2022.12.071 提前访问日期: DEC 2022 出版年: MAR 15 2023

摘要: Herein, we engineered the cobalt core size and carbon shell thickness of Co@C by molten salt electrolysis (MSE) to investigate the enhanced essence of decreasing core size as well as the shell thickness dependence-mediated transition of catalytic mechanisms. We found that the reaction activation energy (RAE) of Co@C/peroxymonosulfate (PMS) systems was intimately dependent on the core sizes for sulfamethoxazole (SMX) degradation. The smaller core size of 26 nm provided a lower RAE of 13.39 kJ mol(-1). In addition, increasing carbon shell thicknesses of Co@C altered the catalytic mechanisms from a radical pathway of SO4 center dot- and center dot OH to to a non-radical pathway of O-1(2) and electron-transfer process (ETP), which were verified by experimental results and density functional theory (DFT) calculations. Interestingly, increasing carbon shell thicknesses promoted the charge transfer between Co metal slab and carbon shell, increased the adsorption energy of PMS molecule on the Co@C slab, and decreased the length of OAO, which favoured the occurrence of non-free radical processes. (c) 2022 Elsevier Inc. All rights reserved.

作者关键词: Molten salt electrolysis; Core size; Shell thickness; Catalytic elimination of sulfamethoxazole; Core-shell catalysts

地址: [Ma, Yongsong; Liu, Xianglin; Zhao, Meiyu; Du, Kaifa; Yin, Huayi; Mao, Xuhui; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

[Ma, Yongsong; Mao, Xuhui; Wang, Dihua] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China.

通讯作者地址: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

Wang, DH (通讯作者)，Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China.

电子邮件地址: wangdh@whu.edu.cn

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