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Title: Chemisorption of estrone in nylon microfiltration membranes: Adsorption mechanism and potential use for estrone removal from water
Authors: Han, J.
Qiu, W.
Hu, J. 
Gao, W.
Keywords: Chemisorption
Hydrogen bond
Trace organic contaminant
Issue Date: 1-Mar-2012
Citation: Han, J., Qiu, W., Hu, J., Gao, W. (2012-03-01). Chemisorption of estrone in nylon microfiltration membranes: Adsorption mechanism and potential use for estrone removal from water. Water Research 46 (3) : 873-881. ScholarBank@NUS Repository.
Abstract: Estrone is a representative steroid estrogen contaminant that has been detected in effluents from sewage treatment facilities, as well as in surface and ground waters. Our study shows that estrone can be readily removed from water via a unique chemisorption mechanism using nylon microfiltration membranes. Experiments on a laboratory in-line filtration system showed instant removal of estrone from 200μg/l aqueous solutions by 0.45-μm nylon membranes (ca. 35L per m 2 membrane). Comparisons with 0.45-μm PVDF, PTFE and glass microfiber membranes suggested that the significant estrone adsorption in nylon membrane should be predominately driven by a different mechanism rather than common physical adsorption. Fourier transform infrared spectroscopy study on nylon membranes and a model compound, N-methylacetamide, showed that the significant adsorption originated from the hydrogen bonding between terminal -OH groups on estrone molecules and nucleophile -CO groups in amide groups of nylon 6,6. The saturated nylon membrane showed very low leachability in ambient water, while it could be effectively regenerated in alkaline or ethanol solutions. Preliminary reusability study showed that the membrane maintained a consistent adsorption capacity for estrone during ten cycles of reuse. The chemisorption-based polymeric adsorption may provide a new alternative approach for removing estrone and potentially other trace organic contaminants from water. © 2011 Elsevier Ltd.
Source Title: Water Research
ISSN: 00431354
DOI: 10.1016/j.watres.2011.11.066
Appears in Collections:Staff Publications

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