膜科学与技术

改性氧化石墨烯-PEBA混合基质膜对苯酚/水的渗透汽化分离性能

作者：吴昊李治康伍艳辉

单位：同济大学化学科学与工程学院，上海市化学品分析、风险评估与控制重点实验室，上海 200092

关键词：渗透汽化；苯酚；氧化石墨烯；双酚A；聚醚胺

出版年,卷(期):页码： 2021,41(6):153-161

摘要：

本研究分别用聚醚胺（PEA）与双酚A（BPA）对氧化石墨烯（GO）进行改性，再与聚醚嵌段共聚酰胺（PEBA）共混制备获得混合基质膜PEA-GO-PEBA与BPA-GO-PEBA，用于水中低浓度苯酚的渗透汽化分离。红外光谱（FT-IR）和X射线光电子能谱（XPS）测试表明PEA与BPA均成功接枝到GO表面，X射线衍射（XRD）测试表明改性后的GO层间距有所增大，其中BPA-GO的层间距增大较为明显，苯酚吸附实验表明改性后的PEA-GO与BPA-GO对苯酚的吸附性能都有提高，其中BPA-GO对苯酚的吸附容量达147.8 mg/g；苯酚/水渗透汽化实验表明在PEBA中引入两种改性GO均能有效提高膜的渗透汽化性能，其中BPA-GO-PEBA混合基质膜的性能更优，55 ℃时通量与分离因子分别达到308 g/(m2·h)和21.1，与未改性的GO-PEBA混合基质膜相比分别提高了50.2%和88.4%，原因在于改性后的BPA- GO对苯酚的亲和性增强且具有更大的层间距。由不同温度下渗透汽化实验数据和Arrhenius方程计算得到BPA-GO-PEBA混合基质膜对苯酚的渗透活化能为81.0 kJ/mol，高于未改性的GO-PEBA混合基质膜和PEBA空白膜，因而温度升高有利于通量和分离因子的同时提高。

In this study, two different modified graphene oxides were derived, namely polyether amine modified graphene oxide (PEA-GO) and bisphenol A modified graphene oxide (BPA-GO). The modified GO were filled into PEBA to prepare mixed matrix membranes, and their pervaporation performance for phenol/water separation were investigated. IR and XPS characterization proved that the modifications are successful. XRD results indicated that the interlayer spacing of BPA-GO increased significantly. The modified GO showed improved adsorption for phenol. The adsorption capacity of BPA-GO reached 147.8 mg/g. After filling modified GO, the separation factor and permeation flux of the pervaporation membrane have been improved. The mixed matrix membrane BPA-GO-PEBA had the better pervaporation performance than PEA-GO-PEBA membrane. It had the permeation flux of 308 g/(m2·h)and the separation factor of 21.1 at the temperature of 55℃. Due to the fact that BPA-GO had better phenol adsorption property and increased d-spacing, the flux and separation factor of BPA-GO-PEBA membrane increased by 50.2% and 88.4% respectively, compared with the mixed matrix membrane filling unmodified GO. According to the pervaporation experiments data and Arrhenius equation, the activation energy of phenol permeation was 81.0 kJ/mol, which was higher than that of PEBA blank membrane and the mixed matrix membrane with unmodified GO. Therefore, with the temperature increasing, the separation factor and permeation flux of the mixed matrix membrane BPA-GO-PEBA increased markedly.

吴昊（1995-），男，上海人，硕士研究生，研究方向为渗透汽化.

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