膜科学与技术

氧化石墨烯量子点改性海藻酸钠复合杂化膜的制备

作者：姚路路，唐林，万云云，崔鹏

单位：合肥工业大学化学与化工学院，安徽省可控化学与材料化工重点实验室，安徽合肥 230009

关键词：氧化石墨烯量子点；海藻酸钠；复合杂化膜；渗透汽化；异丙醇；脱

出版年,卷(期):页码： 2021,41(3):89-97

摘要：

自制氧化石墨烯量子点（GOQDs）分散于海藻酸钠（SA）溶液中，涂覆在多孔尼龙膜支撑层上，制备GOQDs改性SA复合杂化膜。研究了GOQDs的加入对膜结构、形貌、表面亲水性、溶胀性和渗透汽化性能的影响。结果表明，复合杂化膜对异丙醇溶液具有明显的渗透汽化脱水作用，GOQDs含量为2 wt%的膜性能最优，该膜对温度为50℃，水含量为10 wt%的异丙醇溶液表现出渗透通量和分离因子分别为1130±51 g/(m2⋅h)、2241±73，分别是海藻酸钠膜的1.41倍和5.90倍，渗透汽化分离指数PSI为2.53×106 g/(m2⋅h)，比海藻酸钠膜提高了8倍。操作温度的升高会提高膜的分离因子和通量，进料液浓度的增大会使膜的通量显著变大。过量的GOQDs不会对膜渗透汽化脱水产生显著的阻碍作用。

In this paper, self-made graphene oxide quantum dots (GOQDs) were mixed with sodium alginate (SA) polymer homogeneously and the mixture was used to made composite hybrid membrane with polyporous nylon membrane as substrate. The influence to the structure, morphology, surface hydrophilic, swelling degree and pervaporation properties of GOQDs content in the membrane has been discussed in this paper. It can be seen that, SA-GOQD composite hybrid membranes showed excellent pervaporation dehydration properties of isopropanol aqueous. The optimized GOQDs content in membrane was 2 wt%. Here pervaporation flux and separation factor were 1130±51g/(m2⋅h) and 2241±73, the pervaporation separation index (PSI) was 2.53×106 g/(m2⋅h) at 50 oC and 10 wt% water in the feed. These resulted in an increase over the SA control membrane of 1.41-fold, 5.90-fold and more than 8-flod. The flux and separation factor showed increased with temperature elevated at same time. While flux can be improved obviously by higher water content in the feed. It’s not liable to produce the water molecules penetration effect with too much GOQDs, which usually happened as excessive GO accumulation.

姚路路（1980-），男，安徽淮南人，博士，高级实验师，合肥工业大学，研究方向为膜分离技术

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