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[目的]对生物质材料山核桃(Juglans mandshurica Maxim.)壳(CWS)对水中汞离子的吸附效果进行研究。[方法]利用山核桃壳作为生物吸附剂去除水溶液中Hg(Ⅱ)离子,探讨不同条件即溶液pH、吸附时间、Hg(Ⅱ)初始浓度对Hg(Ⅱ)离子吸附效率的影响。[结果]CWS对Hg(Ⅱ)离子吸附率最大时的pH范围为5.0～6.0;随着初始Hg(Ⅱ)浓度的增加吸附率逐渐减小;FTIR分析显示CWS的一些化学基团如羟基、甲基、芳香环甲氧基、羰基可能与吸附Hg(Ⅱ)离子有关;CWS对Hg(Ⅱ)离子的吸附过程与Langmuir和Frendrich吸附等温线相关性较高,从而拟合出吸附方程。[结论]山核桃壳可以作为一种很有前景的生物吸附剂来去除水中Hg(Ⅱ)离子。
[Objective] The research aimed to study the adsorption of mercury ions in water by Juglans mandshurica Maxim. Shell (CWS). [Method] The Hg (Ⅱ) ion in aqueous solution was removed by using pecan shell as biosorbent, and the effects of pH, adsorption time and initial concentration of Hg (Ⅱ) on Hg (Ⅱ) ion adsorption efficiency were discussed. [Result] The optimum pH of CWS for Hg (Ⅱ) ion adsorption was 5.0-6.0. The adsorption rate decreased with the increase of initial Hg (Ⅱ) concentration. The FTIR analysis showed that some chemical groups of CWS such as hydroxyl, Methyl groups, aromatic ring methoxy groups and carbonyl groups may be related to the adsorption of Hg (Ⅱ) ions. The adsorption of Hg (Ⅱ) ions by CWS is highly correlated with the Langmuir and Freundrich adsorption isotherms, and the adsorption equation is fitted. [Conclusion] The pecan shell can be used as a promising biosorbent to remove Hg (Ⅱ) ions in water.