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    Membrane properties and anti-bacterial/anti-biofouling activity of polysulfone-graphene oxide composite membranes phase inversed in graphene oxide non-solvent

    Year: 2017

    Journal: RSC Adv., Volume 7, page 4378–4386

    Authors: Mokkapati, V. R. S. S.; Koseoglu-Imer, Derya Yuksel; Yilmaz-Deveci, Nurmiray; Mijakovic, Ivan; Koyuncu, Ismail

    Organizations: EC-Marie Curie Co-fund Circulation Scheme, TUBITAK [114C032]; VINNOVA [28240005]

    A new and facile method for the fabrication of polysulfone-graphene oxide composite membranes is reported, where after casting, phase inversion is carried out with graphene oxide flakes (GO) in a coagulation bath. The membranes were characterized and the morphology was analysed using scanning electron microscopy. A bacterial inhibition ratio of 74.5% was observed with membranes fabricated from a very low concentration of di-water-GO non-solvent (0.048% of GO). The membranes were successfully tested for permeate flux and fouling resistance using activated sludge filtration from an MBR system. The observed trend shows that GO can operate as a protective barrier for membrane pores against the bacterial community. To our knowledge this is the first time where the immersion precipitation mechanism was carried out in a coagulation bath with GO flakes under continuous stirring. Using this method, a very low concentration of GO is required to fabricate membranes with conventional GO composite membrane properties and better selectivity.
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