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      Layer by Layer Assembly of Poly (Allylamine Hydrochloride)/Phosphate Ions and Poly (Sodium 4-Styrene Sulfonate) Membrane for Forward Osmosis Application

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          Based on the layer by layer (LbL) assembly technology, the nano-scale composite membrane with excellent structure can be prepared by changing the polyelectrolyte and controlling the deposition conditions. Polyamines and phosphate ions (Pi) can be self-organized to form supramolecular systems which could be exploited to stabilize the interfacial architecture. The LbL membrane was made of the positively charged poly (allylamine hydrochloride) (PAH) self-organized with Pi and the negatively charged poly (sodium 4-styrene sulfonate) (PSS) alternatively on top of a poly (acrylonitrile) (PAN) substrate. Compared to the membrane without Pi, the membrane assembled by PAH/Pi improved forward of flux and reduced flux of salt. The concentration of PAH and PSS, deposition time, pH and number of layers showed significant influences on the performance of the membrane. In this experiment, we systematically investigated the preparation conditions and under the optimized conditions the prepared membrane exhibited high water fluxes of 13.5 L m −2 h −1 with corresponding salt to water flux, Js/Jv, ratio of 0.07 g L −1 tested by forward osmosis when DI water as feed solution and 2 mol L −1 MgCl 2 as draw solution.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          14 May 2019
          01 June 2019
          : 18
          : 3
          : 743-749
          1 Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
          2 Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
          Author notes
          *Corresponding author: WANG Zhining
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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