Chemical aging of hydrochar improves the Cd2+ adsorption capacity from aqueous solution

文献类型： 外文期刊

第一作者： Li, Detian

作者： Li, Detian;Cui, Hongbiao;Li, Detian;Xue, Lihong;He, Huayong;Chu, Qingnan;Feng, Yanfang;Yang, Linzhang;Li, Detian;Xue, Lihong;He, Huayong;Chu, Qingnan;Feng, Yanfang;Yang, Linzhang;Cheng, Yueqin;Xue, Lihong;Hua, Yun;Feng, Yanfang;Xue, Lihong;He, Huayong;Feng, Yanfang;Wang, Bingyu;Li, Detian;Cui, Hongbiao;Chu, Qingnan

作者机构：

关键词： Hydrochar; Chemical aging; Cadmium; Surface functional groups; Ion exchange

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 287 卷

页码：

收录情况： SCI

摘要： Hydrochar (HC) serves as a promising adsorbent to remove the cadmium from aqueous solution due to porous structure. The chemical aging method is an efficient and easy-operated approach to improve the adsorption capacity of HC. In this study, four chemical aging hydrochars (CAHCs) were obtained by using nitric acid (HNO3) with mass fractions of 5% (N5-HC), 10% (N10-HC), and 15% (N15-HC) to age the pristine HC (N0-HC) and remove the Cd2+ from the aqueous solution. The results displayed that the N15-HC adsorption capacity was 19.99 mg g(-1) (initial Cd2+ concentration was 50 mg L-1), which increased by 7.4 folds compared to N0-HC. After chemical aging, the specific surface area and oxygen-containing functional groups of CAHCs were increased, which contributed to combination with Cd2+ by physical adsorption and surface complexation. Moreover, ion exchange also occurred during the adsorption process of Cd2+. These findings have important implications for wastewater treatment to transform the forestry waste into a valuable adsorbent for Cd2+ removal from water.

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