• 关键词：钍  浮萍  吸附  三聚氰胺  改性

• 基金项目：湖南省教育厅科研项目（No.15c0985）

• 杨司坤
• 1. 湖南医药学院化学系, 怀化 418000;3. 怀化市环境保护监测站, 怀化 418000

• 吴玮琳
• 湖南医药学院化学系, 怀化 418000

• 侯小娟
• 湖南医药学院化学系, 怀化 418000

• 吴方评
• 湖南医药学院药学系, 怀化 418000

• 陆建生
• 怀化市环境保护监测站, 怀化 418000

• 向开祥
• 湖南医药学院化学系, 怀化 418000

• 摘要：采用生物吸附法去除废水中Th（Ⅳ）离子，研究了水生浮萍化学改性后吸附Th（Ⅳ）的行为特性、吸附模型及吸附机理.以浮萍、三聚氰胺和甲醛为原料，通过接枝反应制得三聚氰胺改性浮萍（MELM），能更好的吸附钍离子.结果表明：常温常压下，pH为5.5，吸附剂MELM为0.03 g，Th（Ⅳ）初始浓度为80 mg·L^-1，反应60 min时，最大吸附率为97.4%，对应吸附量为129.88 mg·g^-1，吸附量比未经处理的浮萍（最优吸附条件下，吸附量为22.83 mg·g^-1）吸附量要大.通过Langmuir、Freundlich、Temkin 3种等温吸附模型对数据进行拟合，Langmuir模型能更好的描述吸附剂MELM对Th（Ⅳ）的平衡吸附行为，同时吸附过程能很好的用准二级反应动力学来解释.此外，FTIR实验数据表明，吸附剂MELM表面上氨基、羟基和羰基是主要的作用基团.

• Abstract：Thorium(Ⅳ) ions sorption is investigated by melamine treated lemna minor from wastewater. Lemna minor reacted with melamine dissolve in formaldehyde (MELM) exhibited the highest thorium(Ⅳ) ions uptake capacity. The sorption process was optimized at pH 5.5, equilibrium time 60 min, initial Th(Ⅳ) mass concentration 80 mg·L^-1 and adsorbent dose 0.03 g with 97.4% of removal efficiency and 129.88 mg·g^-1 of adsorption capacity, which is obviously greater than that (22.83 mg·g^-1) of the untreated lemna minor for Th (Ⅳ) biosorption under the condition of optimization. The experimental data are analyzed by using isotherm and kinetic models. Kinetic data follow the pseudo-second-order model and equilibrium data agree very well with the Langmuir model. In addition, FTIR analysis indicates that hydroxyl, amino, and carbonyl groups act as the important roles in the adsorption process.

• Key words：Th(Ⅳ)  lemna minor  sorption  melamine  modified

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