Abstract
Polymer enhanced ultrafiltration was used to remove Cr(III) from aqueous solution by using complexing agent, copolymer of maleic acid and acrylic acid (PMA-100), and polyvinyl butyral (PVB) ultrafiltration membrane. Effects of mass ratio of polymer/metal (P/M), pH, added salt and citric acid on the rejection of Cr(III) were investigated. Results show that the rejection of Cr(III) can be 97.2% for 10.0 mg/L aqueous solution at P/M 6.0 and pH 5.0, and the a complete removal occurs when pH is not smaller than 6.0, but the membrane will be fouled due to the formation of hydroxide precipitation at pH 6.0. The addition of the citric acid leads to a significant decrease of rejection while the added salt (up to 0.1M) has little effect on the rejection of Cr(III).
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