RR198 and RG19 Dye Removal by using PES membrane modified with graphene oxide nanofillers

Document Type : Research Article

Authors

1 Prof., Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran

2 MSc Studentd, Environmental Science Research Institute, Shahid Beheshti University, Tehran 1983969411

3 Environmental science research institute, Shahid beheshti university

Abstract

The presence of the even very low concentration of dyes makes it undesirable due to its appearance. Most of the organic dyes have aromatic rings in their structure that, make them very toxic and non-biodegradable. So removal of this dyes from industrial effluents before discharging in natural waters is very important. In the present study, Graphene-oxide (GO) nano-sheets were first synthesized using the modified Hammer method and then magnetic graphene oxide (mGO) was prepared using a solvothermal method. The properties of nanofillers were investigated using SEM, XRD and VSM analyzes. The synthesized GO and mGO were embedded in the matrix of polyethersulfone (PES) using phase inversion technique in order to improve its hydrophilicity, permeability, antifouling properties, and rejection performance. Surface and cross-sectional morphology of the resulted bare and nanocomposite membranes were characterized by SEM images. The effect of blended nanoparticles on membrane hydrophilicity and performance were determined using water contact angle, pure water flux, BSA solution filtration, and Reactive Green 19 (RG19) and Reactive Red 198 (RR198) dye solution rejection. Cross-sectional SEM images of the prepared membranes presented an asymmetric structure with a finger like porous sub-layer and dense top-layer. The water contact angle for the bare PES, PES-GO 0.25 wt%, and PES-mGO 0.25wt% were 61.17°, 55.11°, and 51.04°, respectively. The pure water flux of the blended PES membranes was enhanced significantly compared to the bare PES due to the higher hydrophilicity. The results of antifouling properties using BSA filtration demonstrated that the PES-mGO 0.25wt% had the best antifouling properties. Values of flux recovery ratio for the bare PES, PES-GO 0.25 wt%, and PES-mGO 0.25wt% were 45.0, 67.0, and 72.7%, respectively. Dye rejection performance also was increased for the PES-GO 0.25 wt% and PES-mGO 0.25wt% compared to the bare PES. . Compared to the all fabricated membranes, PES-mGO 0.25wt% showed the highest hydrophilicity, permeability, rejection, and antifouling properties.

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References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 8
November 2020
Pages 1983-1994

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