Journal
CHEMICAL ENGINEERING JOURNAL
Volume 322, Issue -, Pages 33-45Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.03.145
Keywords
Graphene oxide; g-C3N4 sheet; Dopamine; Oil/water emulsion; Photocatalytic membrane
Categories
Funding
- Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) [TLN201617]
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In the study, the reduced graphene oxide/graphitic carbon nitride sheet membrane (RGO/PDA/g-C3N4) was fabricated by the dopamine modification and assembling the RGO/PDA/g-C3N4 composites on the surface of commercial CA (cellulose acetate) membrane, consisting of an RGO/PDA/g-C3N4-CA composites membrane and RGO/PDA/g-C3N4 free standing membrane. These membrane materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Atomic Force Microscope (AFM) and UV-vis diffuse reflectance spectra (DRS). The RGO/PDA/g-C3N4 composites membrane achieve to continuous and simultaneous flow -through separation of oil/water emulsion and degradation of soluble organic dye under visible -light irradiation in a short time. The results demonstrate that the flux of RGO/PDA/g-C3N4 composite membrane was strongly influenced by g-C3N4 ratio. With the g-C3N4 ratio increasing, the membrane flux was gradually improved, besides, the separation rate of oil/water emulsion and retention rate of MB (methylene blue) is about 99.5% and 99.8%, respectively. Most important of all, the composite membrane can keep steady flux and high separation and retention efficiency after 5 times of recycling under visible -light irradiation. The composite membrane investigated in this study hope to become an attractive way as promising candidate for water purification. (C) 2017 Elsevier B.V. All rights reserved.
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