柚子皮对模拟放射性废水中钍(IV)的选择性吸附

Selective adsorption of thorium in radioactive waste water by pummelo peel

采用柚子皮作为生物吸附剂,在对模拟的放射性废水的单种金属元素溶液吸附研究中,柚子皮表现出对镧锕系金属离子的高效吸附;在对多种金属元素的混合溶液吸附研究中,柚子皮表现出对钍离子的高效选择性吸附。结果表明,Th^(4+)的质量浓度100 mg/L、初始pH 4、吸附剂浓度3.5 g/L、粒径150~200目、吸附时间120 min时,柚子皮吸附剂对Th^(4+)的去除率可达94.87%,最大吸附量43.01 mg/g。柚子皮对Th^(4+)的吸附行为符合Langmuir等温模型,吸附属于单分子层吸附。柚子皮对钍(IV)的吸附行为符合拟二级动力学模型。

Using the pummelo peel as biological adsorbent, in the study of radioactive waste of a single metal element solution adsorption, pummelo peel showed a strong adsorption of lanthanide actinium metal ions, especially in a variety of metal elements mixed solution adsorption study, it was found that the pum-melo peel exhibited an efficient for selective adsorption of thorium ions. The results show that：when the concentration of Th4＋ was 100 mg/L,the initial pH was 4,adsorbent concentration 3.5 g/L,particle size of 150 -200 mesh,the adsorption time is 120 min,the pummelo peel adsorbent for Th4＋ removal rate can reach 94. 87% ,the maximum adsorption capacity is 43.01 mg/g. The adsorption behavior of the pummelo peel on Th4＋ accorded with the Langmuir isothermal model, and the adsorption was monomolecular ad-sorption. The pseudo-second-order kinetics equation can better describe the adsorption behavior of the pummelo peel on thorium （IV）-