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采用超声降解方法制备了3种不同相对分子质量的壳聚糖季铵盐(CTS-QTS),通过红外光谱和凝胶渗透色谱对降解产物进行了表征,分别研究了CTS-QTS水溶液作汲取液时,CTS-QTS含量与黏度、电导率、渗透压的关系,以及不同膜朝向和汲取液CTS-QTS含量时的水通量、反向溶质通量、截盐率和水回收率等的变化规律。结果表明,正渗透膜的活性层朝向汲取液(AL-DS)模式的水通量要高于活性层朝向原料液(AL-FS)模式,但AL-DS模式下的反向溶质通量大约是AL-FS模式的2倍;在2种模式下,膜的截盐率均在99.9%以上,且AL-FS模式的截盐率略高于AL-DS。CTS-QTS汲取液的水回收性能优良。CTS-QTS有望成为低能耗型绿色正渗透汲取剂。
Three different molecular weight chitosan quaternary ammonium salts (CTS-QTS) were prepared by ultrasonic degradation. The degradation products were characterized by infrared spectroscopy and gel permeation chromatography. The effects of CTS-QTS aqueous solution , The relationship between CTS-QTS content and viscosity, conductivity and osmotic pressure, as well as the changes of water flux, reverse solute flux, salt rejection and water recovery of CTS-QTS with different membrane orientation and draw solution law. The results show that the water flux towards the AL-DS mode of the active layer of the positive osmosis membrane is higher than that of the active layer toward the AL-FS mode, but the reverse solute flux of the AL-DS mode is about Which is twice that of AL-FS mode. In both modes, the salt rejection rate of the membrane is over 99.9%, and the salt rejection rate of AL-FS mode is slightly higher than AL-DS. CTS-QTS draw water recovery performance is excellent. CTS-QTS is expected to become a low-energy green positive-osmosis absorbent.