Abstract:

A series of thin-film composite (TFC) nanofiltration (NF) membranes were prepared by interfacial polymerization, using amino-functionalized graphene oxide (NGO) as the aqueous monomer. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), scanning electron microscope (SEM) and atomic force microscopy (AFM) were applied to measure the chemical compositions and morphologies of the prepared NGO and TFC NF membranes. The effect of NGO and trimesoyl chloride (TMC) concentrations on the separation performance of the TFC NF membranes was investigated systematically. The TFC NF membrane exhibited a high flux of 27.8 L·m^-2·h^-1 under a relatively low operation pressure (0.2 MPa) and an excellent dye/salt separation performance with high rejections for organic dyes (methyl orange of 74.8%, orange G Ⅱ of 96.0%, Congo red of 98.5% and methyl blue of 99%) and low rejections for inorganic salts (Na₂SO₄ of 21.4%, MgSO₄ of 10.7%, NaCl of 5.3% and MgCl₂ of 1.5%). In addition, the TFC NF membrane showed good long term operational stability as well as a satisfying antifouling performance against bovine serum albumin (BSA).

Key words: amino-functionalized graphene oxide, interfacial polymerization, membrane, nanofiltration, preparation

摘要：

采用氨基化氧化石墨烯（NGO）为界面聚合水相单体，制备了超薄复合纳滤膜。研究采用傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、原子力显微镜（AFM）表征了NGO以及复合纳滤膜的化学组成和形貌。系统考察了水相单体浓度、有机相单体浓度对于制备的超薄复合纳滤膜性能的影响。该超薄复合膜在低压（0.2 MPa）下纯水通量可达27.8 L·m^-2·h^-1，对小分子染料有较高的截留率（甲基橙截留率74.8%，橙黄钠截留率96.0%，刚果红截留率98.5%，甲基蓝截留率99%），对于无机盐的截留率较低（Na₂SO₄截留率21.4%，MgSO₄截留率10.7%，NaCl截留率5.3%，MgCl₂截留率1.5%），展现出优异的染料/盐分离性能。同时制备的复合纳滤膜展现了较好的长周期稳定性以及抗污染特性。

关键词: 氨基化氧化石墨烯, 界面聚合, 膜, 纳滤, 制备