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
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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