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壳聚糖季铵盐汲取液的正渗透性能研究

Study on Forward Osmosis PerformAnce of Quaternary Ammonium Salt of Chitosan as a Draw Solution
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摘要 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 weights of quaternary ammonium salts of chitosan (CTS-QTS) were prepared by ultrasonic degradation. The degraded products were characterized by Fourier transform infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC). Different relative molecular mass and different contents of CTS-QTS solutions were studied as draw solutions. The physical properties, such as viscosity, conductivity and osmotic pressure were investigated. The changing rules of water flux, reverse solute flux, salt rejection rate in forward osmosis (FO) process under different content and different membrane orientations Were explored. The results showed that the water flux of AL-DS mode was higher than that of AL-FS mode and reverse solute flux of AL-DS mode was almost twice than that of AL-FS mode. The salt rejection rates were both over 99.9% in the two membrane orientations. Moreover, salt rejection rate of AL-FS mode was slightly higher than that of AL-DS mode. Water recovery rates of draw solutions also exhibited good performance under different content of CTS-QTS as draw agents. Therefore, CTS-QTS was potential to be a green and low-energy consumption of draw agent in forward osmosis.
作者 徐西腾 胡锐 游鑫标 顾文秀 滕跃 邹路易 XU Xiteng1, HU Rui1, YOU Xinbiao1, GU Wenxiu1, TENG Yue2, ZOU Luyi2 (1.School of Chemical & Material Engineering, Jiangnan University; 2.School of Environment and Civil Engineering, Jiangnan University,Wuxi 214122, China)
出处 《水处理技术》 CSCD 北大核心 2017年第7期33-37,43共6页 Technology of Water Treatment
基金 江苏省产学研前瞻性联合创新项目(BY2013015-21)
关键词 正渗透 壳聚糖季铵盐 汲取液 forward osmosis quaternary ammonium salt of chitosan draw solution
作者简介 徐西腾(1990-),男,硕士研究生,研究方向为应用化学;联系电话:15251639498 电子邮件:yexuxxt@163.com 联系作者:顾文秀,副教授;电子邮件:guwenxiu1234@163.com
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