Mishael Yael G, Dubin Paul L
Department of Chemistry, Indiana University-Purdue University, 402 North Blackford Street, Indianapolis, Indiana 46202, USA.
Environ Sci Technol. 2005 Nov 1;39(21):8475-80. doi: 10.1021/es050763s.
Interest has grown in designing new materials for groundwater treatment via "permeable reactive barriers". In the present case, a model siliceous surface, controlled pore glass (CPG), was treated with a polycation (quaternized polyvinyl pyridine, QPVP) which immobilizes anionic/nonionic mixed micelles, in order to solubilize a variety of hydrophobic pollutants. Polymer adsorption on CPG showed atypically slow kinetics and linear adsorption isotherms, which may be a consequence of the substrate porosity. The highest toluene solubilization efficiency was achieved for the silica-polycation-immobilized micelles (SPIM) with the highest polymer loading and lowest micelle binding, a result discussed in terms of the configuration of the bound polymer and the corresponding state of the bound micelles. The ability of SPIM to treat simultaneously a wide range of pollutants and reduce their concentration in solution by 20-90% was demonstrated. Optimization of SPIM systems for remediation calls for a better understanding of both the local environment of the bound micelles and their intrinsic affinities for different hydrophobic pollutants.
通过“渗透性反应屏障”设计用于地下水处理的新型材料，人们对此的兴趣与日俱增。在当前案例中，一种模型硅质表面，即可控孔径玻璃（CPG），用一种固定阴离子/非离子混合胶束的聚阳离子（季铵化聚乙烯基吡啶，QPVP）进行处理，以溶解多种疏水性污染物。聚合物在CPG上的吸附呈现出非典型的缓慢动力学和线性吸附等温线，这可能是底物孔隙率的结果。对于聚合物负载量最高且胶束结合力最低的二氧化硅 - 聚阳离子固定化胶束（SPIM），实现了最高的甲苯溶解效率，这一结果根据结合聚合物的构型和结合胶束的相应状态进行了讨论。结果表明，SPIM能够同时处理多种污染物，并将其在溶液中的浓度降低20 - 90%。为了优化用于修复的SPIM系统，需要更好地了解结合胶束的局部环境及其对不同疏水性污染物的固有亲和力。
