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Development of Separation Process of Heavy Metals by Adsorption with Molecular Imprinted Thermosensitive Microgel Particles

分子印迹热敏微凝胶颗粒吸附分离重金属工艺研究进展

基本信息

批准号：
14550750
负责人：
SAKOHARA Shuji
金额：
$ 2.18万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

In this work, a novel gel adsorbent, which adsorbs and/or desorbs specific heavy metal ions selectively by temperature swing, were examined. The chelating groups, which interact with heavy metal ions, were introduced into the thermosensitive N-isopropylacrylamide (NIPAM) gel using the molecular imprinting technique. Copper (Cu) was selected as a target metal, and N-(4-vinylbenzyl)ethylenediamine (Vb-EDA) was used as a chelating monomer. The maximum adsorption amount of Cu ions was obtained at a specific temperature, at which the swelling degree of gel was the same as that in the preparation of gel, and the adsorption/desorption by temperature swing was possible. It means that the adsorption sites memorized in the preparation were reproduced at a specific temperature. It was confirmed that one Cu ion coordinates with two molecules of Vb-EDA, and that the gel has the selectivity for Cu ion. Furthermore, it was found that the equilibrium adsorption amount was well described by the Langmui … More r isotherm formula. However, it took more than 100 hours to reach the equilibrium adsorption amount, though the ground gel particles of about 100 μm were used. It was considered due to the fact that the thermosensitive gel particles aggregate by the hydrophobic interaction because the peak temperature of adsorption was above the transition temperature of poly(NIPAM), about 32℃. To alleviate this problem the thermosensitive microgel particles involving Vb-EDA were prepared with an anionic polymerizable surfactant. Such microgel particles dispersed stably above the transition temperature of poly(NIPAM). Although the temperature dependence of the adsorption amount and the selectivity for Cu ion were almost the same as those of the ground gel particles mentioned above, the adsorption rate was improved extremely. The adsorption amount reached the equilibrium within 100 minutes. Although it needs further investigations because such microgel particles have a problem for handling, the -possibility for the development of a novel thermosensitive gel adsorbent could be shown Less

本文研究了一种新型的凝胶吸附剂，该吸附剂通过变温选择性地吸附和/或解吸特定的重金属离子。利用分子印迹技术，在温敏性N-异丙基丙烯酰胺（NIPAM）凝胶中引入与重金属离子相互作用的螯合基团。选择铜（Cu）作为目标金属，并且使用N-（4-乙烯基苄基）乙二胺（Vb-EDA）作为螯合单体。在一定温度下，Cu离子的吸附量最大，此时凝胶的溶胀度与制备凝胶时的溶胀度相同，可以进行变温吸附/脱附。这意味着在特定温度下重现了制剂中记忆的吸附位点。结果表明，该凝胶对Cu离子具有选择性，且一个Cu离子与两个Vb-EDA分子配位。此外，还发现平衡吸附量可用Langmuir方程描述 ...更多信息 r等温式然而，即使使用约100 μm的研磨凝胶颗粒，达到平衡吸附量也需要100小时以上。这可能是由于吸附峰温度高于聚NIPAM的相变温度（约32℃），导致温敏凝胶颗粒通过疏水相互作用聚集所致。为了缓解这个问题，用阴离子可聚合表面活性剂制备了涉及Vb-EDA的热敏微凝胶颗粒。这种微凝胶颗粒在聚（NIPAM）的转变温度以上稳定分散。虽然吸附量的温度依赖性和对Cu离子的选择性几乎与上述研磨凝胶颗粒相同，但吸附速率得到极大提高。吸附量在100分钟内达到平衡。尽管由于这种微凝胶颗粒的处理存在问题而需要进一步的研究，但可以显示出开发新型热敏凝胶吸附剂的可能性。