Selective solvent filters for non-aqueous phase liquid separation from water.

Scientific Reports
Tatianna MarshallErica Pensini

Abstract

Injectable filters permeable to water but impermeable to non-polar solvents were developed to contain non-aqueous phase liquids (NAPL) in contaminated aquifers, hence protecting downstream receptors during NAPL remediation. Filters were produced by injecting aqueous solutions of 0.01% chitosan, hydroxyethylcellulose and quaternized hydroxyethylcellulose into sand columns, followed by rinsing with water. Polymer sorption onto silica was verified using a quartz-crystal microbalance with dissipation monitoring. Fluorescence and gas chromatography mass spectroscopy showed low ppm range concentrations of non-polar solvents (e.g., hexane and toluene) in water eluted from the filters (in the absence of emulsifiers). The contact angles between polymer-coated surfaces and hexane or toluene were > 90°, indicating surface oleophobicity. Organic, polar solvents (e.g. tetrahydrofuran and tetrachloroethylene, TCE) were not separated from water. The contact angles between polymer-coated surfaces and TCE was also > 90°. However, the contact area with polymer coated surfaces was greater for TCE than non-polar solvents, suggesting higher affinity between TCE and the surfaces. Emulsifiers can be used to facilitate NAPL extraction from aquifers. E...Continue Reading

References

Jun 30, 2000·Journal of Colloid and Interface Science·E Mubarekyan, M M Santore
Aug 5, 2000·Journal of Colloid and Interface Science·S Kapsabelis, C A Prestidge
Jan 27, 2011·Environmental Science & Technology·Elizabeth B KujawinskiMolly C Redmond
Nov 21, 2012·Environmental Science & Technology·Erica PensiniDenis O'Carroll
Jul 5, 2013·ACS Applied Materials & Interfaces·Xiaoyan ZhouBo Ge
Dec 2, 2019·Journal of Colloid and Interface Science·Kristine LamontAlejandro G Marangoni
Jan 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Peter SafiehErica Pensini
Feb 23, 2020·Journal of Environmental Sciences (China)·Kristine LamontErica Pensini

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Methods Mentioned

BETA
polymeric filtration
fluorescence
fluorescence spectroscopy
QCM-D
rheology

Software Mentioned

Attension
Enhanced Data Analysis

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