Journal
INTERNATIONAL JOURNAL OF SUSTAINABLE ENGINEERING
Volume 4, Issue 1, Pages 75-83Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19397038.2010.497230
Keywords
biosolvents; green membranes; methyl lactate; polysulphone; ultrafiltration
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Ultrafiltration membranes were prepared using cellulose acetate (CA) as a polymer, LiCl and CaCl2 as porogens and methyl(S)-lactate as a solvent. CA, methyl lactate and the porogens used in this work are obtained from renewable resources; they are biodegradable, non-toxic and non-volatile organic compounds. Flat sheet ultrafiltration membranes were prepared by the phase inversion technique. A molecular weight cut-off between 15 and 35 kDa (polyethylene glycol) and pure water permeability between 13 and 177 litres h(-1) m(-2) bar(-1) were obtained. These parameters are in the ideal range for water treatment industry. Improvement of pollutant degree and ecotoxicity of the process was evaluated by 'green' metrics by the P (pollutants, persistent and bioaccumulative) and E (ecotoxicity) parameters. Both of these variables were recorded as zero using our method. This study represents a step ahead towards the production of ultrafiltration polymeric membranes by a 'greener' process than current methods.
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