标題: Microscopic mechanism about the selective adsorption of Cr(VI) from salt solution on nitrogen-doped carbon aerogel microsphere pyrolysis products

作者: Li, JH (Li, Jiahao); Cheng, R (Cheng, Rong); Chen, JA (Chen, Jiaao); Lan, JR (Lan, Jirong); Li, SY (Li, Shiyao); Zhou, M (Zhou, Min); Zeng, TY (Zeng, Tianyu); Hou, HB (Hou, Haobo)

來源出版物: SCIENCE OF THE TOTAL ENVIRONMENT 卷: 798 DOI: 10.1016/j.scitotenv.2021.149331 出版年: DEC 1 2021

摘要: A series of nitrogen-doped carbon aerogels (NCAs) were obtained through phase reaction polymerization and different carbonization temperatures to enhance adsorption efficacy of hexavalent chromium (Cr[VI]) from wastewater significantly. Factors that influence adsorption properties of carbon aerogel microspheres toward Cr(VI), such as pH, adsorbent content, initial Cr(VI) concentrations, and coexisting anion, were investigated. Three isotherm (Langmuir, Freundlich, and Sips) and three kinetic (pseudofirst-order, pseudosecond-order, and Elovich) models were used to interpret the adsorption process. The adsorption capacity of Cr(VI) reached 180.62 mg.g(-1), which was superior to that of most aerogel adsorbents. In addition to the adsorption effect, the XPS results also showed that N-containing groups on the NCA surface reduce the adsorbed Cr(VI) to the less toxic Cr(III). The prepared sorbent demonstrates a negligible loss in adsorption capacity after 6 cycles. NCAs show acceptable application prospects in selective removal of Cr(VI) ions. (C) 2021 Published by Elsevier B.V.

作者關鍵詞: Carbon aerogel; Selective removal; Chromium; Adsorption

地址: [Li, Jiahao; Cheng, Rong; Chen, Jiaao; Lan, Jirong; Li, Shiyao; Zhou, Min; Zeng, Tianyu; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

[Li, Jiahao; Zeng, Tianyu; Hou, Haobo] Zhaoqing Wuhan Univ, Environm Technol Res Inst, Zhaoqing 526200, Guangdong, Peoples R China.

通訊作者地址: Zeng, TY; Hou, HB (通訊作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

電子郵件地址: zty_0209@whu.edu.cn; houhb@whu.edu.cn

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