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己二酸调控聚醚砜/磺化聚砜致密超滤膜结构及染料/盐选择分离性能

作者：杨淑倩，刘晓伟，胡梦洋，崔振宇，何本桥，李建新

单位： 1 天津工业大学分离膜与膜过程国家重点实验室，天津，300387；2 天津工业大学材料科学与工程学院，天津，300387

关键词：聚醚砜；磺化聚砜；己二酸；致密超滤膜；染料/盐选择性分离

DOI号：

分类号： TB34

出版年,卷(期):页码： 2020,40(3):28-36

摘要：

本文以聚醚砜（PES）和亲水性磺化聚砜（SPSf）为原料进行共混，以己二酸为致孔剂，采用非溶剂致相分离法（NIPS）制备PES/SPSf致密超滤膜（UF），重点考察铸膜液中己二酸含量（0-13 wt%）对PES/SPSf共混膜结构和性能的影响规律。结果表明，随着铸膜液中己二酸含量增加，铸膜液粘度逐渐增加，膜断面结构逐渐由指状孔转变为海绵体结构。当己二酸添加量为11 wt%以及聚合物浓度31wt%（PES/SPSf=84/16）时，所制备共混膜断面为完全的海绵体结构。该膜切割分子量（MWCO）约为7250 Da，平均孔径约为1.81 nm，纯水通量为144 L m?2 h?1（操作压力0.2 MPa）。共混膜处理刚果红（CR）（696 Da）与Na2SO4混合液时，对刚果红截留保持在100%，Na2SO4截留率 < 25%，显示出优异的染料和盐选择分离性和稳定性。处理靛蓝磺酸钠（IC）（466 Da）/CR/Na2SO4三元体系时，其染料截留率分别为93.1%和100%，同样表现出优异的染料和盐选择分离性和稳定性。

The aim of this study is to fabricate polythersulfone (PES)/sulfonated polysulfone (SPSf) tight ultrafiltration membrane for dye/salt selective separation by non-solvent induced phase separation (NIPS) method using adipic acid as additive. The effect of adipic acid concentration (0-13 wt%) on the morphology and properties of blend membrane was investigated. Results showed that the morphology of resultant membranes with the mass ratio of PES/SPSf=84/16 and polymer concentration of 31 wt% gradually changed from finger-like support layer into full sponge-like structure as an increase of adipic acid concentration to 11 wt% in the casting solution. Simultaneously, the resultant membrane with the molecular weight cut-off of 7250 Da and pore size of 1.81 nm displayed a high permeability and separation performance. The pure water flux was up to 144 L h?1 m?2 under the operating pressure of 0.2 MPa. The rejection for the mixture of Congo red (696 Da) and Na2SO4 was 100% and 25%, respectively, indicating a high selective separation for dye and salt and stability. Similarly, when the membrane was used to treat the mixture of Indigo Carmine (IC) (466 Da)/CR/ Na2SO4, the rejection was 93.1% for IC and 100% for CR. It also exhibited an excellent selective separation performance and operating stability.

基金项目：

国家自然科学基金项目（21878230）；天津市科技计划项目（18PTZWHZ00210）；教育部创新团队发展计划资助（IRT17_R80）

作者简介：

第一作者简介：杨淑倩（1993-），女，山东日照人，硕士生，从事聚合物分离膜及染料废水处理研究。 *通讯作者：E-mail：jxli@tiangong.edu.cn

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