Layer-by-Layer Assembly of Inorganic Nanosheets and Polyelectrolytes for Reverse Osmosis Composite Membranes

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Yongmin Ko¹  Seunghye Lee¹  Joona Bang¹  Jinhan Cho¹  Wanseok Choi¹  Hyemin Sung¹  Jungkyu Choi¹ 

[1] Department of Chemical and Biological Engineering, Korea University

关键词: RO Membrane;    Layer-by-Layer Assembly;    Electrostatic Interaction;    Polyelectrolyte Layers;    Montmorillonite (MTM) Nanosheet;   

DOI  :  10.1252/jcej.13we136

来源: Maruzen Company Ltd

【 摘 要 】

References(27)Cited-By(3)In this study, we introduce a layer-by-layer (LbL) assembly method to prepare a reverse osmosis (RO) desalination membrane that consists of a hybrid combination of [polyelectrolyte (PE)/montmorillonite (MTM)]n layers. First, adopting poly(allylamine hydrochloride) (PAH) for a PE layer, an RO test showed that the permeate flux of water through (PAH/MTM)n multilayer-coated membranes decreased from ∼25.5 to ∼8.3 L·m−2·h−1 with the increased bilayer number from n=9 to n=18. At the same time, the corresponding ion rejection with respect to NaCl is increased from ∼30 to ∼81%. Despite the increased ion rejection performance, (PAH/MTM)n membranes exhibit a poor chlorine resistance, as frequently observed in commercial polyamide-based RO membranes. In our previous study, it was noted that the RO membranes, prepared just from the PE multilayers (i.e., [PAH/poly(acrylic acid) (PAA)]n layers), showed a marked chlorine tolerance, but concomitantly very low permeate flux (∼4–5 L·m−2·h−1). Considering the significant drawback in each case (poor chlorine tolerance for (PAH/MTM)n layers and low permeate flux for (PAH/PAA)n layers), we proposed to combine the layer constituents primarily by inserting PAH/PAA layers between two adjacent PAH/MTM layers. Indeed, the flux is maintained at ∼7.5±0.5 L·m−2·h−1, comparable to commercial membranes, while the salt rejection ability is as high as ∼75±2.5% and the stability against the chlorine attack is well preserved with ∼74±5.0% ion rejection after the NaOCl treatment.

【 授权许可】

Unknown