1. Synthesis of graphene oxide/polyacrylamide composite membranes for organic dyes/water separation in water purification.
- Author
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Cheng, Meng-meng, Huang, Lin-jun, Wang, Yan-xin, Zhao, Yun-chao, Tang, Jian-guo, Wang, Yao, Zhang, Yang, Hedayati, Mohammadhasan, Kipper, Matt J., and Wickramasinghe, S. Ranil
- Subjects
GRAPHENE oxide ,NANOFILTRATION ,SALINE water conversion ,WATER purification ,POLYACRYLAMIDE ,AQUEOUS solutions ,CONTACT angle measurement - Abstract
To obtain nanofiltration membranes with high-performance in desalination and water purification, membranes of graphene oxide (GO), reduced graphene oxide (rGO) and GO/polyacrylamide (PAM) are prepared by a vacuum filtration method. This method is conducted in aqueous solution without any organic solvents. The graphene-based membranes (GBMs) are characterized by UV-visible spectroscopy, Fourier-transform infrared spectroscopy, transmission electron microscopy, atomic force microscopy, scanning electron microscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy. The hydrophilicity of GBMs is also evaluated by contact angle measurement. The interlayer spacing of GO membrane (0.85 nm), GO/PAM membrane (0.68 nm) and rGO membrane (0.36 nm) are measured by X-ray diffraction. The performance of the GBMs is evaluated on a dead-end filtration device. The water flux and retention of rhodamine B of the membranes are 399.04 L m
−2 h−1 bar−1 and 85.03% (GO), 188.89 L m−2 h−1 bar−1 and 95.43% (GO/PAM), 85.85 L m−2 h−1 bar−1 and 97.06% (rGO), respectively. The GO/PAM membrane has the best comprehensive separation performance because of its proper interlayer spacing. GO/PAM membranes provide potential advantages in the design of high-performance membranes for molecular separation and water purification. [ABSTRACT FROM AUTHOR]- Published
- 2019
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