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Graphene Coated Microfiltration Ceramic Membrane Fabricated by Photothermic Conversion of Polyimide

Published online by Cambridge University Press:  31 May 2017

Mohamed Bayati ,
Haiming Peng ,
Heng Deng ,
Jian Lin  and
Maria Fidalgo
Mohamed Bayati
Affiliation:
Civil and Environmental Engineering, University of Missouri, MO65211, U.S.A.
Haiming Peng
Affiliation:
Civil and Environmental Engineering, University of Missouri, MO65211, U.S.A.
Heng Deng
Affiliation:
Mechanical & Aerospace Engineering, University of Missouri, MO65211, U.S.A.
Jian Lin
Affiliation:
Mechanical & Aerospace Engineering, University of Missouri, MO65211, U.S.A.
Maria Fidalgo*
Affiliation:
Civil and Environmental Engineering, University of Missouri, MO65211, U.S.A.
*
*(Email: [email protected])
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Abstract

In this study, a novel technique has been developed for the fabrication of uniform, stable, and strongly bonded graphene layers on microporous ceramic membranes. A composite ceramic-LIG membrane was obtained following one step scalable methodology. First, the ceramic support was spin-coated with poly (pyromellitic dianhydrideco-4,4´-oxidianiline, amic acid) (PMDA-ODA) and transformed to polyimide (PI) by thermal imidization. The PI was then irradiated with a CO2 laser to photothermally convert the sp3-carbon atoms to sp2-carbon atoms. Different PMDA-ODA layers were applied to achieve uniform coating by LIG on the membrane surface. The LIG was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and contact angle (CA) measurements. FTIR results showed a complete conversion of PMDA-ODA to PI following the thermal imidization reaction. The XRD results revealed the crystalline structure of graphene layer, which had a surface area of 130 ± 5.6 m2/g, determined by BET nitrogen adsorption. However, the permeability of uncoated ceramic membranes decreased with increasing number of PMDA-ODA layers, as evidenced by the clean water filtration experiments. The new composite membrane is a promising new material for membrane distillation or electro osmosis, where the hydrophobicity of the graphene layer may provide important advantages over current membrane materials.

Keywords

ceramiccoatingcomposite
Type
Articles
Information
MRS Advances , Volume 2 , Issue 46: Soft Materials and Biomaterials , 2017 , pp. 2489 - 2495
Copyright
Copyright © Materials Research Society 2017 

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