生物炭
吸附
化学
水溶液
盐酸
吸热过程
聚吡咯
弗伦德利希方程
核化学
无机化学
离子交换
热解
离子
有机化学
聚合
聚合物
作者
Hui Wang,Dengjie Zhong,Yunlan Xu,Haixing Chang,H. Shen,Chunzi Xu,Jiaxin Mou,Nianbing Zhong,Bin Tang
标识
DOI:10.1080/01932691.2023.2234480
摘要
In this work, in view of the poor adsorption capacity of sludge-based biochar, a sludge-based biochar adsorbent co-modified with hydrochloric acid and polypyrrole (PPy/SBC-HCl) was prepared and used to remove Cr(VI) from aqueous solution. Its characterization of SEM, EDS, BET, XRD, FT-IR, and XPS show that the removal mechanism of Cr(VI) by PPy/SBC-HCl includes electrostatic adsorption, ion exchange, reduction, and complexation. The removal efficiency of Cr(VI) by PPy/SBC-HCl decreases with the increase of pH. The coexisting cations Ca2+ and Mg2+ have a slight negative effect on it, while the oxoacid anions have a great negative effect on it. The adsorption of Cr(VI) by PPy/SBC-HCl is a spontaneous endothermic process, which conforms to the pseudo-second-order adsorption kinetic model and the Freundlich adsorption isotherm model. The maximum adsorption capacity is 97.37 mg g−1 at pH 2.0 and temperature 298 K.
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