School of Materials Science and Engineering, Shanghai University, Shanghai 200072,China; Key Laboratory of Graphene Technologies & Applications of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201,China.
Key Laboratory of Graphene Technologies & Applications of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201,China.
J Colloid Interface Sci. 2019 Jun 1;545:276-281. doi: 10.1016/j.jcis.2019.03.027. Epub 2019 Mar 14.
Graphene oxide (GO) based membranes are widely adopted in molecular separation based on size exclusion effect by stacked GO sheets. Both high flux and efficient rejection of GO-based membranes for long-term operation are highly expected for practical applications. Here, an attapulgite (ATP) nanofibers/ GO composite (ATP/GO) membrane is assembled by filtration of mixed aqueous colloidal suspensions of ATP and GO. Due to the modification of interlayer distance and surface property of GO membrane by ATP, the ATP/GO membrane demonstrates excellent separation performance, with a high water flux of 221.16 Lm hbar, 7.7 times higher than that of pure GO membrane. Meanwhile, the rejection of ATP/GO is also slightly improved comparing with that of GO membrane. It is also found that increasing the thickness of the membrane is effective to enhance rejection percentage. The ATP/GO membranes reported here show high efficiency for molecular separation, which demonstrates potential applications in water purification and environmental protection.
基于氧化石墨烯（GO）的膜广泛应用于基于堆叠 GO 片层的尺寸排阻效应的分子分离。对于实际应用，人们高度期望 GO 基膜具有长期运行的高通量和高效截留性能。在这里，通过过滤混合的凹凸棒石（ATP）和 GO 的水胶体悬浮液来组装 ATP/GO 复合膜。由于 ATP 对 GO 膜层间距离和表面性质的修饰，ATP/GO 膜表现出优异的分离性能，纯水通量达到 221.16 Lm hbar，是纯 GO 膜的 7.7 倍。同时，与 GO 膜相比，ATP/GO 的截留率也略有提高。还发现增加膜的厚度可以有效地提高截留率。本文报道的 ATP/GO 膜在分子分离方面表现出高效率，在水净化和环境保护方面具有潜在的应用前景。
