Abstract
In this paper, four nanofiltration membranes, viz., (1) coating of N,O-carboxymethyl chitosan (NOCC) on polyethersulfone ultrafiltration (PES UF) substrate membrane; (2) chitosan and acrylonitrile butadiene styrene (ABS) in the blend ratio of 0:100 (ABS); (3) diethylenetriamine pentaacetic acid coating via casting method on PES UF substrate membrane (DC50); and (4) NOCC and cellulose acetate (CA) polymer blend solution (0.4 wt%) coated on a glass plate (NOCC–CA), were selected from our previous work. By using these membranes, separation behaviour of mercury and chromium ions was studied at different operating conditions from their salt solutions. From the experimental data, it is evident that ABS membrane gave highest observed solute rejection (92.88 and 88.67 % for 10 ppm feed concentration of mercury sulphate–water system and chromium sulphate–water system, respectively) and NOCC–CA membrane gave highest permeate volume flux. But from the rejection as well as permeate volume flux point of view, NOCC–PES membrane is considered to be the best choice among all the membranes.
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