GO-enhanced PVA mixed matrix membranes for dehydration of alcohol/water mixture via pervaporation
GO-enhanced PVA mixed matrix membranes for dehydration of alcohol/water mixture via pervaporation
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DOI：
10.1007/s10853-023-08944-z
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发表时间：
2023-09
影响因子：
4.5
通讯作者：
Nan Xiang;Lin Li;Hua Wang;Jiang Qian;Tonghua Wang
中科院分区：
文献类型：
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作者：
Nan Xiang;Lin Li;Hua Wang;Jiang Qian;Tonghua Wang
采用喷涂法在聚砜（PSF）超滤基膜表面制备了氧化石墨烯（GO）-聚乙烯醇（PVA）混合基质膜（MMM），用于乙醇和异丙醇的渗透汽化脱水。PVA具有优异的成膜性，并且富含羟基。GO纳米片可以与PVA交联，这使得GO纳米片能够良好地分散在PVA中而没有界面缺陷。研究了GO浓度和GO纳米片尺寸对MMM分离性能的影响。对不同混合物（乙醇/水= 70：30、80：20、90：10和95：5重量%，异丙醇/水= 80：20重量%）以及不同温度的混合溶液对GO-PVA金属陶瓷PV性能的影响。当mGO/mPVA的质量分数为2.0%时，GO-PVA MMM在50 °C下对90wt%乙醇水溶液的PV性能最好。GO-PVA MMM的渗透通量和分离因子分别为263.01 g/（m2 h）和115.48。随着GO纳米片尺寸的减小，更多的GO纳米片进入PVA基体中，GO纳米片具有选择性孔隙并与PVA形成交联结构，从而提高了GO-PVA MMM的PV性能。在相同实验条件下，对于异丙醇-水混合溶液，GO-PVA MMM的分离因子远高于乙醇-水混合溶液。
Graphene oxide (GO)—polyvinyl alcohol (PVA) mixed matrix membranes (MMMs) were prepared on the surface of polysulfone (PSF) ultrafiltration basement membrane by the spray coating method for the dehydration of ethanol and isopropanol via pervaporation (PV). PVA has an excellent membrane-forming property and is rich in hydroxyl groups. GO nanosheets can be cross-linked with PVA that enables GO nanosheets to be well dispersed in PVA without interfacial defects. The effects of GO concentration and the size of GO nanosheets on the separation performance of MMMs were investigated. A complete analysis of different mixtures (ethanol/water = 70:30, 80:20, 90:10 and 95:5 wt.%, isopropanol/water = 80:20 wt.%) and different temperatures of mixed solution for the PV performance of GO-PVA MMMs was studied. When the ratio of mGO/mPVAis 2.0%, the GO-PVA MMMs provided the best PV performance for 90 wt% ethanol–water solution at 50 °C. The permeation flux and separation factor of GO-PVA MMMs were 263.01 g/(m2h) and 115.48, respectively. With the decrease of the size of GO nanosheets, more GO nanosheets enter the PVA matrix, and the PV performance of the GO-PVA MMMs is increased because the GO nanosheets have selective pores and form a cross-linking structure with PVA. For isopropanol–water mixed solution, the separation factor of GO-PVA MMMs was much higher than that for ethanol–water mixed solution at the same experimental condition.