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  

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

作　　者：杨淑倩 刘晓伟[1] 胡梦洋 崔振宇[1] 何本桥[1] 李建新[1] YANG Shuqian;LIU Xiaowei;HU Mengyang;CUI Zhenyu;HE Benqiao;LI Jianxin(State Key Laboratory of Separation Membrane and Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China)

机构地区：[1]天津工业大学分离膜与膜过程国家重点实验室,材料科学与工程学院,天津300387

出　　处：《膜科学与技术》2020年第3期28-36,共9页Membrane Science and Technology

基　　金：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)。

摘　　要：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,铸膜液黏度逐渐增加,膜断面结构逐渐由指状孔转变为海绵体结构.当己二酸添加质量分数为11%以及聚合物质量分数为31%(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,平均孔径约为1.81 nm,纯水通量为144 L/(m2·h)(操作压力0.2 MPa).共混膜处理刚果红(CR)与Na2SO4混合液时,对刚果红截留率保持在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)/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)dense 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%)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%gradually changed from finger-like support layer into full sponge-like structure as an increase of adipic acid concentration to 11%in the casting solution.Simultaneously,the resultant membrane with the molecular weight cut-off of 7250 and pore size of 1.81 nm displayed a high permeability and separation performance.The pure water flux was up to 144 L/(m2·h)under the operating pressure of 0.2 MPa.The rejections for Congo red and Na2SO4 were 100%and 25%,respectively,indicating a high selective separation for dye and salt.Similarly,when the membrane was used to treat the mixture of Indigo Carmine(IC)/CR/Na2SO4,the rejections were 93.1%for IC and 100%for CR.It also exhibited an excellent selective separation performance and operating stability.

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[一般工业技术—材料科学与工程]