氧化石墨烯-陶瓷复合纳滤膜的层层自组装制备及其性能  

Layer-by-layer self-assembly preparation and performance of GO-ceramics composite nanofiltration membrane

作　　者：高克 许中煌 洪昱斌 丁马太[1] 何旭敏[3] 蓝伟光[1,2] 

机构地区：[1]厦门大学材料学院,福建厦门361005 [2]三达膜科技(厦门)有限公司,福建厦门361022 [3]厦门大学化学化工学院,福建厦门361005

出　　处：《化工学报》2017年第5期2177-2185,共9页CIESC Journal

摘　　要：氧化石墨烯(GO)的片层边缘含有COOH等含氧官能团,因而带负电荷,可以在带正电荷多孔基体上通过层层自组装实现快速沉积。以由3-氨丙基三乙氧基硅烷(APTES)修饰的多孔氧化铝管式陶瓷膜为基膜,令GO和聚乙烯亚胺(PEI)以溶液形态在其表面交替沉积实现自组装,继以环氧氯丙烷(ECH)交联之,制备新型氧化石墨烯-陶瓷复合纳滤膜。最佳制备工艺是,PEI浓度5 g·L^(-1)、pH(28)9,Na Cl浓度0.3 mol·L^(-1),GO浓度0.6 mg·ml-1、pH(28)4.5,层数2层,ECH用量6.25 ml·L^(-1),50℃条件下处理70 min。层数为1～4层的自组装膜在0.6 MPa操作压力下对2 g·L^(-1)的MgCl_2的截留率分别为90.16%、93.71%、97.54%、92.93%,其中1层自组装膜的渗透通量为21.92 L·m^(-2)·h^(-1)。氧化石墨烯-陶瓷复合纳滤膜对4种无机盐的截留率大小为MgCl_2>Mg SO4>Na Cl>Na2SO4,符合典型正电荷纳滤膜的特征。Graphene oxide(GO) can be quickly deposited on a positively charged porous matrix via a layer-by-layer self-assembly strategy because GO nanosheets contain rich negatively charged, oxygen-containing function groups, such as COOH. In this paper, the GO-ceramics composite nanofiltration membrane was prepared via layer-by-layer deposition of GO solution and eolyethyleneimine(PEI) solution alternately, and then cross-linked by epoxy chloropropane(ECH) on 3-aminopropyltriethoxysilane-modified porous Al_2O_3 supports. The optimum preparation conditions were: PEI 5g·L^(-1), pH(28) 9; Na Cl 0.3 mol·L^(-1); GO 0.6 mg·L^(-1), pH(28) 4.5; ECH 6.25 ml·L^(-1) and heat treatment 50℃/70 min. Under the conditions of 0.6 MPa, when the self-assembly layer number increased from 1 to 4, the rejection to 2 g·L^(-1) MgCl_2 were 90.16%, 93.71%, 97.54%, and 92.93% respectively,and the flux of self-assembled monolayer membrane was 21.92 L·m^(-2)·h^(-1). The rejection orders of inorganic salts of GO-ceramics composite nanofiltration membrane were as follows: MgCl_2>MgSO_4>NaCl>Na_2SO_4, therefore they showed the typical positively charged nanofiltration membrane characteristics.

关 键 词：氧化石墨烯 层层自组装 纳滤 荷正电 膜 过滤 

分 类 号：TQ028.8[化学工程]