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Effect of adipic acid on the morphology and properties of polythersulfone (PES)/sulfonated polysulfone (SPSf) tight ultrafiltration membrane for dye/salt selective separation

Authors： YANG shuqian，LIU Xiaowei，HU Mengyang，CUI Zhenyu，HE Beqiao，LI Jianxin

Units： 1. State Key Laboratory of Separation Membrane and Processes, Tiangong University, Tianjin 300387, China；2. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： Polythersulfone; Sulfonated polysulfone; Adipic acid; Tight ultrafiltration membrane; Selective separation of dye and salts

ClassificationCode：TB34

year,volume(issue):pagination： 2020,40(3):28-36

Abstract：

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.

Funds：

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）

AuthorIntro：

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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