膜科学与技术

双间距亚纳米复合通道g-C3N4/GO膜对一价/多价离子的筛分

作者：冯才兴，李盟，袁浩，尹德鹏，蒲冬梅，潘婷，冉瑾

单位：合肥工业大学化学与化工学院，安徽合肥 230009

关键词： g-C3N4；氧化石墨烯；双间距亚纳米通道；离子筛分

出版年,卷(期):页码： 2020,40(2):30-38

摘要：

离子筛分在化工分离领域占有非常重要的地位。目前可用的技术，主要是通过构建具有纳米通道和纳米孔的膜，基于离子尺寸大小进行筛分，但实现一价/多价金属离子的精确筛分仍是一个巨大的挑战。本文报道一种采用真空抽滤的方法制备二维g-C3N4/GO复合膜，其层间具有双间距亚纳米离子通道，有效宽度分别为~0.86 nm和0.76 nm，双间距亚纳米离子通道尺寸都介于一价K+与多价离子Al3+水合直径之间，可用于精确有效地筛分一价/多价金属离子。同时在复合膜制备过程中，由于g-C3N4能够与相对应的GO纳米片发生温和的原位还原，从而构建有利于离子筛分的层间微环境。在离子筛分实验中，GO膜对于Na+/多价金属离子没有筛分性能，然而g-C3N4/GO可以有效分离Na+/多价金属离子，分离因子能达到10以上，其中Na+/Al3+分离因子甚至高达35，表明g-C3N4/GO复合膜具有优异的一价/多价离子的筛分。

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.

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

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