• 关键词：重金属  生物吸附  毛木耳子实体  动力学模型  等温吸附模型

• 基金项目：国家自然科学基金(No.30600011,50779080);广东省自然科学基金团队资助项目(No.06202438)

• 蒋新宇
• 中山大学环境科学与工程学院, 广州 510275

• 黄海伟
• 中山大学环境科学与工程学院, 广州 510275

• 曹理想
• 中山大学生命科学学院, 广州 510275

• 张仁铎
• 中山大学环境科学与工程学院, 广州 510275

• 摘要：以毛木耳(Auricularia polytricha)子实体为生物吸附材料,研究起始pH值、反应时间、重金属浓度这3个因素对毛木耳子实体吸附Cd²⁺、Cu²⁺、Pb²⁺、Zn²⁺的影响及其吸附特性.结果表明,pH是影响毛木耳子实体吸附重金属离子的主要因素,最适起始pH值为5;在10mg·L^-1重金属浓度下,毛木耳子实体对Cd²⁺、Cu²⁺、Pb²⁺、Zn²⁺的最大吸附率分别为94.12%、96.22%、99.94%、99.19%;准二阶动力学模型比准一阶动力学模型能更好地描述毛木耳子实体对4种重金属的吸附过程;Langmuir等温模型能较好地拟合毛木耳子实体对4种重金属的等温吸附过程;毛木耳子实体对Cd²⁺、Cu²⁺、Pb²⁺、Zn²⁺的最大吸附量分别为10.09、8.36、23.57和3.64mg·g^-1;毛木耳子实体吸附Cd²⁺、Cu²⁺、Zn²⁺的化学反应机理可能为离子交换反应.

• Abstract：Using Auricularia polytricha as a biosorbent,we studied the effects of different factors,including contact time,pH,and heavy metal concentrations,on adsorption of Cd²⁺,Cu²⁺,Pb²⁺,Zn²⁺ by the biosorbent. The pH was the most influential factor for the biosorption. The optimum initial pH was 5 for the maximum adsorption. With metal concentrations of 10 mg·L^-1,the maximum removals of Cd²⁺,Cu²⁺,Pb²⁺,Zn²⁺ by A. polytricha were 94.12%,96.22%,99.94%,and 99.19%,respectively. The pseudo-second-order kinetics model could better characterize the biosorption processes of the metals than the pseudo-first-order kinetics model. The Langmuir isotherm model was successfully used to fit the equilibrium data. The maximum biosorption capacities of A. polytricha were 10.09,8.36,23.57,and 3.64 mg·g^-1,respectively,for Cd²⁺,Cu²⁺,Pb²⁺,Zn²⁺. Ion exchange may be the main mechanism for the biosorption of Cd²⁺,Cu²⁺,Zn²⁺ by the biosorbent.

• Key words：heavy metals  biosorption  Auricularia polytricha  kinetic models  isotherms model

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