Kwon, Soon-Bum Lee, Jong Suk Kwon, Soon Jin Yun, Seong-Taek Lee, Seockheon Lee, Jung-Hyun 2024-01-20T06:31:16Z 2024-01-20T06:31:16Z 2021-09-04 2015-08-15 0376-7388 https://pubs.kist.re.kr/handle/201004/125120 A recently devised, molecular layer-by-layer (mLbL) approach based on the alternative cross linking of monomers was employed to fabricate high-performance thin film composite (TFC) forward osmosis (FO) membranes with excellent rejection toward monovalent NaCl salt. An ultrathin and highly dense polyamide (PA) selective layer with a precisely controlled structure was created on a tailored porous support via mLbL. The intrinsic separation properties of the rnLbL-assembled TFC membranes were tuned by adjusting the mLbL cycle number to optimize the FO performance. The best FO performance was achieved at 10 rnLbL cycles (mLbL-10), where the permeability and selectivity were properly balanced. Importantly, the mLbL-10 membrane exhibited superior FO performance compared to the commercial HTI FO membranes as well as hand Cast TFC membranes prepared by the conventional interfacial polymerization: the rnLbL-10 membrane showed similar to 3.5 Limes higher wafer flux, similar to 60% lower reverse salt flux and similar to 85% lower specific salt flux compared to the cellulose triacetate HTI membrane, with 0.5 M NaCl draw solution and DI water teed solution in FO mode. The stability and the associated membrane performance of the mLbL-assembled membrane depending on the ionic strength of the environment were explained by the swelling behavior of the polyelectrolyte-assembled interlayer adhered underneath the PA selective layer. (C) 2015 Elsevier By. All rights reserved. English ELSEVIER SCIENCE BV THIN-FILM-COMPOSITE INTERNAL CONCENTRATION POLARIZATION PRESSURE RETARDED OSMOSIS POLYELECTROLYTE MULTILAYER MEMBRANES ENGINEERED OSMOSIS POWER-GENERATION HIGH-PERFORMANCE SUPPORT LAYER FO MEMBRANES WATER FLUX Molecular layer-by-layer assembled forward osmosis membranes Article 10.1016/j.memsci.2015.04.015 1 JOURNAL OF MEMBRANE SCIENCE, v.488, pp.111 - 120 JOURNAL OF MEMBRANE SCIENCE 488 111 120 scie scopus 000354814300010 2-s2.0-84928712480 Engineering, Chemical Polymer Science Engineering Polymer Science Article THIN-FILM-COMPOSITE INTERNAL CONCENTRATION POLARIZATION PRESSURE RETARDED OSMOSIS POLYELECTROLYTE MULTILAYER MEMBRANES ENGINEERED OSMOSIS POWER-GENERATION HIGH-PERFORMANCE SUPPORT LAYER FO MEMBRANES WATER FLUX Molecular layer-by-layer Polyamide Thin film composite membranes Forward osmosis Desalination