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首页> 外文期刊>Journal of Applied Polymer Science >The application of polyethyleneimine draw solution in a combined forward osmosisanofiltration system
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The application of polyethyleneimine draw solution in a combined forward osmosisanofiltration system

机译：聚乙烯亚胺汲取溶液在正渗透/纳滤联合系统中的应用

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The objective of this study is to investigate the effect of solution chemistry of branched polyethyleneimine (PEI) draw solute and to evaluate the PEI draw solute in a combined forward osmosis (FO)anofiltration (NF) system. Pure water was extracted from feed solution using the FO process, and the separation of pure water was achieved by the NF process. Lower molecular weight PEI showed higher water flux than higher molecular weight PEI, due to the lower internal concentration polarization caused by a higher diffusion rate and the easy permeation of pure water by lower viscosity of the draw solution (DS). The FO water flux was determined by the osmotic pressure induced by protonation/deprotonation of PEI, and the reverse draw solute flux was determined by the combination of PEI size due to the speciation and electrostatic interaction between the membrane and PEI. This study shows that the J(s)/J(w) value of PEI at pH 7 was smaller than those of sodium chloride and magnesium sulfate. The recovery of PEI DS using NF has a higher value (99.4%) than of sodium chloride (20.6%) and magnesium sulfate (97.0%); this means that PEI would be a promising draw solute in an FO-NF combined system for the saline water desalination. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42198.
机译：这项研究的目的是研究支化聚乙烯亚胺（PEI）抽提溶质的溶液化学作用，并评估正向渗透（FO）/纳滤（NF）组合系统中的PEI抽提溶质。使用FO工艺从进料溶液中提取纯水，通过NF工艺分离纯水。与较低分子量的PEI相比，较低分子量的PEI表现出更高的水通量，这是由于较高的扩散速率和较低的汲取溶液（DS）粘度导致纯水易于渗透导致较低的内部浓度极化。 FO水通量是由PEI质子化/去质子化所引起的渗透压确定的，而反向抽吸溶质通量则是由PEI尺寸的组合确定的，这归因于膜与PEI之间的形成和静电相互作用。这项研究表明，在pH 7时，PEI的J（s）/ J（w）值小于氯化钠和硫酸镁。使用NF回收PEI DS的值（99.4％）高于氯化钠（20.6％）和硫酸镁（97.0％）;这意味着PEI将成为用于盐水脱盐的FO-NF组合系统中的一种有前途的吸引溶质。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42198。

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