Vahid Jabbari - Effect of solution chemistry and operating conditions on the nanofiltration of acid dyes by a nanocomposite membrane

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      Publication Details (including relevant citation   information):

      Water Science & Technology 64 (12), 2404-2409


      A composite nanofiltration membrane was developed by a   poly(acrylic acid) in situ ultraviolet (UV) graft polymerization   process using an ultrafiltration polysulfone membrane as a porous   support, by a phase inversion method. SEM images showed that the   PSf membranes had numerous finger-like pores. Atomic force   microscopy (AFM) showed that the roughness of the surface was   reduced by an increase in UV irradiation times. The rejections of   sodium chloride and sodium sulfate were moderate and declined   with the increase of concentration. We observed that by   increasing UV irradiation time and nanofiltration pressure   applied, retention of dyes was enhanced and in the most   irradiated membrane (M-4 membrane) at 4 bars, color removal with   a high rejection of about 99.80% was achieved. It was found that   the separation efficiency of dyes in the mixture of salt and dyes   decreased with the salt concentration due to a decrease in the   Donnan effect. It was also found that by varying the pH, the   membrane surface and the dyes' charges are changed, which meant   that the membrane surface and dyes had different interactions at   various pHs.

      Address (URL): doi:10.2166/wst.2011.601