Enhanced desorption of phenanthrene from aquifer sand using amphiphilic anionic polyurethane nanoparticles

초록

A novel process for washing soil using polymer nanoparticles is presented in this paper. Amphiphilic crosslinked polyurethane (ACPU) nanoparticles were synthesized via soap-free emulsion polymerization of urethane acrylate anionomers (UAA). Even though ACPU nanoparticles exhibited lower phenanthrene solubilizing performance and interfacial activity than sodium dodecyl sulfate (SDS), ACPU nanoparticles exhibited better extraction efficiency for sorbed phenanthrene than did SDS at a relatively lower concentration. This phenomenon occurred because the degree of sorption of ACPU nanoparticles to the aquifer sand was lower than that of the surfactant, owing to the chemically cross-linked nature of the ACPU nanoparticles. From an in-situ extraction test, ACPU nanoparticles extracted greater amounts of sorbed phenanthrene from the soil column than did SDS solutions at the same concentration and flow rate because of the lower degree of sorption of the ACPU nanoparticles to the aquifer sand.

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