SPSF共混Tröger’s base超滤膜制备及抗污染性能

以Tröger base （TB）和磺化度为20%的磺化聚砜（SPSF）为共混材料，N-甲基-2-吡咯烷酮（NMP）为溶剂，乙二醇单甲醚（EGM）为致孔剂，去离子水为凝固浴，采用非溶剂致相分离法（NIPS）制备了一种新型的SPSF/TB共混超滤膜，考察了共混比对膜结构、水接触角、孔隙率、水通量、BSA截留率和抗污染性能的影响.结果表明，共混之后原有的中性胺及磺酸反应生成了相应的铵盐及磺酸根，表面接触角得以降低，亲水性增强，水通量增加，显著改善了膜的抗污染能力；此外，SPSF/TB膜结构上变成了梯度海绵孔结构，特别是较大共混比时因有机高分子盐的形成，聚合物交联呈现了独特的网状结构.与纯TB膜相比，SPSF/TB^3~15膜水通量JWC达到274.92~343.21L/（m²·h）（操作压力为0.1MPa），通量恢复率值（FRR）达到61.11%~67.45%，分别提升了42.88%~78.37%和67.4%~84.8%.在最优条件下，SPSF/TB⁵对废水中的乳化油截留率可达到98.52%以上，循环3次后水通量和FRR分别趋于199.1L/（m²·h）和61.6%.

Investigation of preparation and antifouling property of SPSF and Tröger’s base blending ultrafiltration membrane

Tröger's base (TB) and sulfonated polysulfone (SPSF) with sulfonation degree of 20% as blending materialswere used to prepare a novelSPSF/TB blending ultrafiltration membranes by non-solvent induced phase separation process (NIPS), N-methyl-2-pyrrolidone (NMP), ethylene glycol monomethyl ether (EGM) and deionized water were worked as solvent, pore-forming agent and coagulation bath, respectively. The effects of blending ratio on membrane structure, water contact angle, porosity, pure water flux, BSA rejection rate and antifouling property were investigated. The results showed that the surface contact angle of blending membrane was reduced, the hydrophilicity was enhanced, the pure water flux was increased, and the hydrophilicity and the antifouling ability of the blending membranes were significantly improved with the increase of SPSF mass ratiosince the original neutral amines and sulphonic acid has been changed into corresponding ammonium salts and sulphonates after blending. It was further revealed that the morphology and structure of SPSF/TB blending membrane were completely changed into a gradient sponge pore structurewith the increase of SPSF mass ratio. Especially, the polymer crosslinkedshowed a unique network structuredue to the formation of organic polymer salts at a larger blending ratio. The pure water flux (JWC) and the pure flux recovery rate (FRR) of SPSF/TB^3-15reached 274.92~343.21L/(m²·h) (operating pressure of 0.1MPa) and 61.11%~67.45%, respectively, increased by 42.88%~78.37% and 67.4%~84.8% compared with pure TB membrane. The oil-bearing wastewaterrejection of SPSF/TB⁵ reached more than 98.52%, the water flux and the FRR reached 199.1L/(m²·h), and 61.6% after 3 cycles, respectively under the optimum conditions.