Negatively charged UF membranes

The applicability of polyacrylonitrile (PAN)-based negatively charged UF membrane for As removal was demonstrated for the first time by Lohokare et al. (2008). The surface of flat-sheet PAN-based UF membranes was hydrolyzed by using NaOH in cross-flow mode this approach led to the reduction in pore size (as demonstrated by the reduction in water flux and the increased rejection towards proteins and polyethylene glycol) due to the formation of carboxylate (—COO ) groups on both membrane and pore wall surfaces and an increased membrane hydrophilicity. The MWCO after the NaOH treatment was found to be of about 6 kDa. These modified membranes showed excellent As(V) rej actions (close to 100%) when simulated solutions containing 5 0 xg ... 

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