Thorough removal of inorganic and organic mercury from aqueous solutions by adsorption on Lemna minor powder
Thorough removal of inorganic and organic mercury from aqueous solutions by adsorption on Lemna minor powder
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通过浮萍粉吸附彻底去除水溶液中的无机和有机汞
DOI：
10.1016/j.jhazmat.2010.11.009
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发表时间：
2011-02-15
影响因子：
13.6
通讯作者：
Ni Jian-Cong
中科院分区：
文献类型：
--
作者：
Li Shun-Xing;Zheng Feng-Ying;Ni Jian-Cong
使用冷蒸气原子吸收光谱法研究了浮萍（Lemnaminor）粉末去除无机和有机汞（甲基和乙基汞）的吸附能力。最佳吸附条件为：（a）溶液pH值（无机汞和乙基汞为7.0，甲基汞为9.0），（b）无机汞、甲基汞和乙基汞的平衡吸附时间分别为10，20和40 min。 L小粉吸附40 min后，当无机汞和有机汞的初始浓度分别在12.0μgL(-1)和50.0μgL(-1)以下时，汞残留浓度分别满足中国和美国环保署规定的饮用水标准(1.0μgL(-1))和废水允许排放限值(10.0μgL(-1))。首次报道了从水溶液中彻底去除无机和有机汞。通过与水中无机和有机汞阳离子的表面静电相互作用，显着的吸附位点是C-O-P和磷酸基团，然后通过L小细胞表面的胺基团与汞之间的强螯合相互作用产生选择性吸附。 (c) 2010 Elsevier B.V. 保留所有权利。
The adsorption ability of duckweed (Lemna minor) powders for removing inorganic and organic mercury (methyl and ethyl mercury) has been studied using cold vapour atomic absorption spectrometry. The optimal adsorption conditions were: (a) the pH value of the solution 7.0 for inorganic and ethyl mercury, 9.0 for methyl mercury, and (b) equilibrium adsorption time 10,20, and 40 min for inorganic mercury, methyl mercury, and ethyl mercury, respectively. After adsorption by L minor powder for 40 min, when the initial concentrations of inorganic and organic mercury were under 12.0 mu gL(-1) and 50.0 mu gL(-1), respectively, the residual concentrations of mercury could meet the criterion of drinking water (1.0 mu gL(-1)) and the permitted discharge limit of wastewater (10.0 mu gL(-1)) set by China and USEPA, respectively. Thorough removal of both inorganic and organic mercury from aqueous solutions was reported for the first time. The significant adsorption sites were C-O-P and phosphate groups by the surface electrostatic interactions with aqueous inorganic and organic mercury cations, and then the selective adsorption was resulted from the strong chelating interaction between amine groups and mercury on the surface of L minor cells. (c) 2010 Elsevier B.V. All rights reserved.