Abstract
Polyethylene microfiltration membranes were hydrophilized by treating them with ternary mixtures of ethanol-water-inorganic acids. It was found that the threshold pressure necessary to initiate water permeation through the polyethylene membranes depends on the composition of hydrophilizing mixture. The membranes hydrophilized by the ternary solutions showed much better initial flux and lower flux decline rate as compared with those hydrophilized with ethanol alone. It was found that the hydrophilizing efficiency of the inorganic acid in the mixture decreases in the order HNO 3 > H 2SO 4 > H 3PO 4. However, the flux retention efficiency decreases in the reverse sequence.
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