Abstract：
Ultrafiltration technology, separating water from impurities by the core membrane, is an effective strategy for treating wastewater to meet the ever-growing requirement of clean and drinking water. However, the similar nature of hydrophobic organic pollutants and the membrane surface leads to severe adsorption and aggregation, resulting unavoidable membrane degradation of penetration and rejection. The present study presents a novel block amphiphilic polymer, polyethersulfone-g-carboxymethyl chitosan@MWCNT (PES-g-CMC@MWCNT), which is synthesized by grafting hydrophobic polyethersulfone to hydrophilic carboxymethyl chitosan in order to suspend CMC in organic solution. A mixture of hydrophilic carboxymethyl chitosan and hydrophobic polymers (polyethersulfone), in which hydrophilic segments are bonded to hydrophobic segments, could provide hydrophilic groups, as well as gather and remain stable on membrane surfaces by their hydrophobic interaction for improved compatibility and durability. The resultant ultrafiltration membranes exhibit high water flux (198.10 L m-2·h-1), suitable hydrophilicity (64.77°), enhanced antifouling property (82.96%), while still maintains excellent rejection of bovine serum albumin (91.75%). There has also been an improvement in membrane cross-sectional morphology, resulting in more regular pores size (47.64 nm) and higher porosity (84.60%). These results indicate that amphiphilic polymer may be able to significantly promote antifouling and permeability of ultrafiltration membranes.
摘要：
超滤技术,通过核心膜将水与杂质分离，是处理废水以满足不断增长的清洁和饮用水需求的有效策略。然而,疏水性有机污染物与膜表面性质相似导致严重的吸附和聚集,导致不可避免的膜降解的渗透和排斥。本研究提出了一种新型的嵌段两亲聚合物，聚醚砜-g-羧甲基壳聚糖@MWCNT(PES-g-CMC@MWCNT)，通过将疏水性聚醚砜接枝到亲水性羧甲基壳聚糖以将CMC悬浮在有机溶液中而合成。亲水性羧甲基壳聚糖和疏水性聚合物（聚醚砜）的混合物，其中亲水链段与疏水链段键合，可以提供亲水基团，以及通过疏水相互作用在膜表面上聚集并保持稳定，以改善相容性和耐久性。所得超滤膜具有高的水通量（198.10Lm-2·h-1），合适的亲水性(64.77°),增强防污性能（82.96%），同时仍保持对牛血清白蛋白的优异排斥(91.75%)。膜横截面形态也有改善，导致更规则的孔径（47.64nm）和更高的孔隙率（84.60％）。这些结果表明，两亲性聚合物可能能够显着促进超滤膜的防污和渗透性。
