title: Uptake of organic pollutants by silica--polycation-Immobilized micelles for groundwater remediation.
abstract: 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.
authors.affiliation: Department of Chemistry, Indiana University-Purdue University, 402 North Blackford Street, Indianapolis, Indiana 46202, USA.
authors.forename: Yael G
authors.initials: YG
authors.lastname: Mishael
authors.forename: Paul L
authors.initials: PL
authors.lastname: Dubin
mesh_terms: D000327:Adsorption; D008823:Micelles; D009930:Organic Chemicals / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014874:Water Pollutants, Chemical
chemical_list: D008823:Micelles; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide