标题: Transforming CO2 into Sulfur-Doped Carbon As a High-Efficiency Persulfate Catalyst for the Degradation of 2,4-Dichlorphenol: Influential Factors, Activation Mechanism, and Regeneration of Catalyst

作者: Ma, YS (Ma, Yongsong); Gu, YX (Gu, Yuxing); Jiang, D (Jiang, Da); Mao, XH (Mao, Xuhui); Wang, DH (Wang, Dihua)

来源出版物: ACS ES&T WATER卷: 1期: 8页: 1796-1806 DOI: 10.1021/acsestwater.1c00112出版年: AUG 13 2021

摘要: The burning of fossil fuels leads to the emission of large amounts of CO2 into the air, and how to deal with the increasingly generated CO2 has been a great challenge. In an effort to convert the low-value CO2 into valuable material, this work proposed sulfur-doped CO2 converted carbon (S-EC) by molten salt carbon capture electrochemical transformation (MSCC-ET) as a persulfate (PS) activator for 2,4-dichlorophenol (2,4-DCP) removal. The catalytic performance of CO, converted carbon (EC) was dramatically enhanced by sulfur modification. The most efficient dosage of S-EC was 50 mg L-1; the most efficient dosage of PS was 5:1 M for PS/2,4-DCP, and the efficient pH range was 3.0-9.0. The results of radical quenching experiments and electron paramagnetic resonance spectroscopy further confirmed the novel nonradical process in a S-EC/PS system. Furthermore, the novel nonradical activation mechanism of S-EC on PS was further identified on the basis of the results of density functional theory (DFT) calculations and polarization curves. In addition, the degradation intermediates such as 4-chlorophenol, 2-chlorophenol, 2-chlorohydroquinone, and some carboxylic acids were identified by gas chromatography-mass spectrometry (GC-MS), and the possible degradation pathways were summarized. Remarkably, the molten salt redox-sulfidation method can completely restore the catalytic performance of used S-EC for PS. This work extends the application of EC materials for environmental remediation.

入藏号: WOS:000685943100015

语言: English

文献类型: Article

作者关键词: CO2 converted carbon; sulfur-doped; 2,4-DCP; nonradical; DFT calculations

地址: [Ma, Yongsong; Gu, Yuxing; Jiang, Da; Mao, Xuhui; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

[Wang, Dihua] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, 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 S, Wuhan 430072, Peoples R China.

电子邮件地址:wangdh@whu.edu.cn