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中文摘要：
研究了水葫芦根系作为生物吸附剂净化废水中的Cu和Cd污染。结果表明,在单金属污染条件下,水葫芦根系对2种重金属都表现出较高的去除率,但在Cu-Cd复合污染条件下,Cu^2＋的存在对Cd^2＋的吸附表现出强烈的抑制作用。通过测定吸附前后溶液中Ca2＋、Mg2＋、K＋和H＋浓度变化确定了生物选择性吸附过程中离子交换机理的作用。X射线光电子能谱检测表明,根系表面的胺和含氧官能团在吸附过程中通过螯合方式去除重金属离子起到了非常重要的作用。Cu^2＋的存在可以替代吸附剂上Cd^2＋的所有吸附位点。在多种金属复合污染条件下,竞争抑制作用是导致净化效果差异的关键因素,并阐明了竞争抑制机理。
英文摘要：
The removal of Cu^2＋ and Cd^2＋ in water by water hyacinth roots was studied.The results show that with individual metal pollution,water hyacinth roots can remove Cu^2＋and Cd^2＋ efficiently.However,in a dual-metal arrangement,Cu^2＋ was found to pose a strong inhibition effect on Cd^2＋ uptake by the biosorbent.The release of Ca2＋,Mg2＋,K＋ and H＋from water hyacinth roots confirms the existence of an ion exchange process in the biosorption of the two cationic metal ions.X ray photoelectron spectroscopy further reveals that amine and oxygencontaining groups in the biosorbent also contribute to the metal uptake via chelation.Experiment with Cd^2＋- sorbed biosorbent shows that Cu^2＋ can displace almost all of the adsorbed Cd^2＋ from their binding sites on the biosorbent.In a several-metal arrangement,the competitive inhibition is a critical factor causing the different sorption amounts.The mechanism of competitive inhibition was also studied.
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