【摘要】：氧化石墨烯(GO)的片層邊緣含有COOH等含氧官能團(tuán),因而帶負(fù)電荷,可以在帶正電荷多孔基體上通過層層自組裝實(shí)現(xiàn)快速沉積。以由3-氨丙基三乙氧基硅烷(APTES)修飾的多孔氧化鋁管式陶瓷膜為基膜,令GO和聚乙烯亞胺(PEI)以溶液形態(tài)在其表面交替沉積實(shí)現(xiàn)自組裝,繼以環(huán)氧氯丙烷(ECH)交聯(lián)之,制備新型氧化石墨烯-陶瓷復(fù)合納濾膜。最佳制備工藝是,PEI濃度5 g·L~(-1)、pH(28)9,Na Cl濃度0.3 mol·L~(-1),GO濃度0.6 mg·ml-1、pH(28)4.5,層數(shù)2層,ECH用量6.25 ml·L~(-1),50℃條件下處理70 min。層數(shù)為1～4層的自組裝膜在0.6 MPa操作壓力下對2 g·L~(-1)的MgCl_2的截留率分別為90.16%、93.71%、97.54%、92.93%,其中1層自組裝膜的滲透通量為21.92 L·m~(-2)·h~(-1)。氧化石墨烯-陶瓷復(fù)合納濾膜對4種無機(jī)鹽的截留率大小為MgCl_2Mg SO4Na ClNa2SO4,符合典型正電荷納濾膜的特征。
[Abstract]:The oxide graphene (go) has oxygen functional groups such as COOH on the edge of the layer, so it has negative charge, and can be deposited rapidly on the porous matrix with positive charge by layer self-assembly. The porous alumina tubular ceramic membrane modified by 3-aminopropyl triethoxy silane (APTES) was used as the base film. Go and PEI were deposited alternately on the surface of the porous alumina ceramic membrane in solution form and then crosslinked with epichlorohydrin (ECH). A novel graphene oxide / ceramic composite nanofiltration membrane was prepared. The optimum preparation conditions were as follows: the concentration of PEI was 5 g L ~ (-1) and the concentration of NaCl was 0.3 mol L ~ (-1) C ~ (-1). The concentration of 0. 6 mg / L ~ (-1) go was 0. 6 mg ml / L ~ (-1) (pH _ (28) 4.5, and the level of 2 layers was 6. 25 ml / L ~ (-1) ~ (-1) ~ (-1) at 50 鈩，

本文編號：2127666