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Date of Publication:2017-01-01

Journal:化工学报

Issue:1

Page Number:375-384

ISSN No.:0438-1157

Abstract:Polyvinylidene fluoride (PVDF)/graphene oxide (GO) nanocomposite membranes, which were made of PVDF naocomposites with different content of super hydrophilic graphene oxide (GO) nanosheets, were assessed for long term application in a membrane bioreactor (MBR) system. Critical flux, MBR performance, membrane resistance, and anti-fouling properties were intensively studied. Surface hydrophilicity of PVDF/GO membranes was improved with presence of surficial oxygen-containing groups up to 29.33% (GO=3%). PVDF/GO membranes showed similar anti-fouling to PVDF control membrane, however, PVDF/GO (GO=3%) membrane required only one cleaning with cleaning cycle 4 times longer than PVDF control. PVDF/GO membrane had lower membrane resistance than PVDF control and significant reduction in irreversible fouling resistance. As an example, PVDF/GO (GO=3%) membrane had about 9%of irreversible fouling resistance of PVDF control. Antifouling improvement of PVDF/GO membrane was further shown by EPS study that much lower EPS intensities were observed with a reduction of 59.98% (GO=1%) and 69.57% (GO=3%) in comparison to PVDF control. Scanning electron microscopy (SEM) and confocal laser scanning microscope (CLSM) results showed that cake layer on nanocomposite membrane became looser and thinner with the increase of GO content. Part of PVDF/GO (GO=3%) membrane surface was exposed, resulting in high stable permeability over a long period of time.

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