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以3种不同分子量的壳寡糖(COS)溶液为汲取液,研究了汲取液浓度与p H值、电导率、粘度和渗透压的关系,分析了不同分子量、壳寡糖浓度、膜活性层朝向时的水通量、反向溶质通量和截留率等因素的变化规律,讨论了其对纯水的回收率.结果表明,壳寡糖溶液具有较高的电导率和渗透压,可产生较高的水通量,正渗透膜的活性层朝向汲取液(AL-DS)模式时的水通量优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较AL-FS模式大;两种模式下膜的截留率均在99.9%以上,且AL-FS模式的截留率略高于AL-DS;COS汲取液对纯水的回收性能良好.
Three kinds of chitooligosaccharides (COS) solution with different molecular weights were taken as the draw solution to study the relationship between the draw solution concentration and the p H value, the conductivity, the viscosity and the osmotic pressure. The effects of different molecular weights, chitosan oligosaccharide concentration, The direction of the water flux, reverse solute flux and rejection rate and other factors change, discussed its recovery of pure water.The results show that chitooligosaccharides solution with high conductivity and osmotic pressure, can produce The higher water flux, the water flux of the active layer of the forward osmosis membrane toward the draw solution (AL-DS) mode is better than that of the active layer towards the AL-FS mode, but the reverse of the AL-DS mode The solute flux was larger than that of AL-FS mode. The rejection of membrane was above 99.9% in both modes, and the rejection of AL-FS mode was slightly higher than AL-DS.