膜科学与技术

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ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2020,40(2):30-38

Abstract：

Ion sieving plays a very important role in the field of chemical separation. Currently available techniques focus on constructing membranes with nanochannels and nanopores for separating ions through the size sieving mechanism. But achieving precise screening of monovalent/multivalent metal ions remains a significant challenge. In this paper, a two-dimensional g-C3N4/GO composite membrane was prepared by vacuum filtration. Such a membrane exhibits double-pitch sub-nano ion channels between layers with effective widths of ~8.6 ? and 7.6 ?, respectively. The channel sizes fall in between monovalent and multivalent ion hydration diameters and thus it can be used to accurately and efficiently screen monovalent/multivalent metal ions. At the same time, in the preparation process of composite membranes, since g-C3N4 can gently reduce corresponding GO nanosheets, an interlayer microenvironment favorable for ion sieving is constructed. In the ion sieving experiment, the GO membrane has no sieving performance for Na+/multivalent metal ions. However, the composite membrane can effectively separate Na+/multivalent ions, and the separation factor can reach more than 10. The Na+/Al3+ separation factor is even as high as 35. It is shown that the g-C3N4/GO composite membrane has excellent monovalent/multivalent ion sieving.

Funds：

国家级大学生创新实验项目基金（201810359032）及国家自然科学基金（21978062）项目。

AuthorIntro：

第一作者简介：冯才兴（1998-），男，贵州六盘水人，本科生，主要从事GO-g-C3N4复合膜的制备及表征研究. 通讯作者，E-mail：ranjin@hfut.edu.cn

Reference：

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