期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 18, 页码 16140-16147出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03591
关键词
composite membrane; graphene sieve; mixed matrix membrane; surface modification; cross-linking
资金
- UK's Biotechnology and Biological Sciences Research Council (BBSRC)
- Engineering and Physical Sciences Research Council (EPSRC) through BioProNET Network in Industrial Biotechnology and Bioenergy [BB/L013770/1]
- BBSRC [BB/L013770/1] Funding Source: UKRI
Robust, readily scalable, high-flux graphene oxide (GO) mixed matrix composite membranes were developed for organic solvent nanofiltration. Hydroxylated polybenzimidazole was synthesized by N-benzylation of polybenzimidazole with 4-(chloromethyl)benzyl alcohol, which was confirmed by FTIR and NMR spectroscopy. Flat-sheet composite membranes comprising of polybenzimidazoles and 1 or 2 wt % GO were fabricated via conventional blade coating and phase inversion. Subsequently, GO was covalently anchored to the hydroxyl groups of the polymer using a diisocyanate cross-linking agent. The even distribution of GO in the membranes was mapped by visible-light microscopy. Hydroxylation and incorporation of GO in the polymer matrix increased the permeance up to 45.2 +/- 1.6 L m(-2) h(-1) bar(-1) in acetone, nearly 5 times higher than the unmodified benchmark membrane. The enhancement in permeance from the addition of GO did not compromise the solute rejection. The composite membranes were found to be tight in seven organic solvents, having molecular weight cut-offs (MWCO) as low as 140 g mol(-1). Permeance increased with increasing solvent polarity, while rejection of a 420 g mol(-1) pharmaceutical remained over 93%. The covalent anchoring resulted in robust composite membranes that maintained constant performance over 14 days in a continuous cross-flow configuration.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据