摘要
羧甲基壳聚糖(CMC)具有良好的生物相容性和生物可降解性,用石墨烯、碳纳米管等纳米材料填充的羧甲基薄膜材料近些年来被广泛的研究报道~(1-2)。在本体系中,将CMC在乙酸溶液中透析,成功制备了羧甲基壳聚糖薄膜。FT-IR和XRD结果表明成膜过程中羧甲基壳聚糖由多元酸钠盐的形式变成了多元酸的形式。在羧甲基壳聚糖溶液中加入氧化石墨烯(GO)可以有效的提高膜的强度。TEM照片显示GO能够很好的分散在CMC溶液中(Figure 1a),红外图谱可以证实GO与CMC通过共价键相连。在玻璃板上干燥后,SEM图显示膜的透析面是光滑的结构,而沉积面是比较粗糙的结构(Figure 1b-1c)。为了提高膜的电化学性质,加入抗坏血酸钠还原GO。我们还发现GO可以有效的猝灭CMC膜的荧光,而且还原后的淬灭效果更好。综上,我们提供了一种简单制备CMC膜的方法,希望该薄膜材料可以在废水处理,选择性透析,生物医药等方面发挥应用价值。
In this work,the CMC membrane is successfully prepared by dialyzing 2%CMC aqueous solution in acetic acid solution.FT-IR and XRD are employed to detect the composition and explain the mechanism of the membrane formation.It is found that the composition of the membrane has changed from polybasic acid sodium salt to polybasic acid.When graphene oxide(GO) is introduced to this system,the mechanical strength of the membrane is enhanced obviously.TEM results indicate that GO is well dispersed in CMC solution on a molecular scale(Figure la).Sodium L-ascorbate is added to reduce GO,which is expected to promote the electrochemical property of the membrane.We expect the membrane prepared in this work may have promising applications in water purification,selective dialysis and other fields.
引文
(1).Yang,X.;Tu,Y.;Li,L.;Shang,S.;Tao,X.ACS Appl.Mater.Interfaces 2010,2,1707-1713.
(2).Wang,J.;Gao,X.;Wang,J.;Wei,Y.;Li,Z.;Gao,C.ACS Appl.Mater.Interfaces 2015,7,4381-4389.