The graphene oxide (GO) membrane was fabricated via self-assembling poly (ethylenimine) (PEI) and GO nanosheets on hydrolyzed polyacrylonitrile (H-PAN) substrate by electrostatic adsorption. The cross-linking provided the stacked GO nanosheets with the necessary stability to overcome their inherent dispensability in water environment.So, the effect of the concentration of PEI (0.5, 1.0, 1.5, 2.0, 2.5 g/L) on membrane preparation and water treatment was investigated. The property and structure of the GO composite membranes were characterized by Fourier transform infrared (FTIR) spectroscopy, water contact angle goniometer and scanning electron microscope (SEM). The Fourier transform infrared (FTIR) spectroscopy showed that GO homogenously covered on the membrane with changing of functional groups and formation of chemical bonds. The hydrophilic tests revealed the uniformity of each layer and confirmed the analysis of the successful self-assembly of the membrane. Scanning electron microscopy (SEM) indicated the defect on the GO layer. Considering the flux and the rejection, the optimal concentration of PEI was finally selected to be 1.0 g/L. The GO composite membrane not only qualified the water flux and the rejection of methyl orange, but also effectively removed various organic contaminants from natural surface water.%采用自组装法在改性聚丙烯腈平板膜表面交替沉积带正电的交联剂聚乙烯亚胺和带负电的氧化石墨烯溶液,利用静电吸附原理,制得氧化石墨烯复合膜.并探究聚乙烯亚胺溶液的浓度(0.5,1.0,1.5,2.0,2.5 g/L)对膜制备效果与水处理效果的影响.傅里叶变换红外分析光谱、水接触角分析和扫描电镜结果表明自组装过程中官能团的变化,证实氧化石墨烯层的成功组装.综合纯水通量和甲基橙截留效果,最终选定聚乙烯亚胺溶液的最佳浓度为1.0 g/L.以金川河水作为原水,复合膜对天然有机物的截留能力明显提高.
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