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