Synthesis of high flux forward osmosis membranes by chemically crosslinked layer-by-layer polyelectrolytes

摘要: Forward osmosis (FO) membranes were successfully fabricated using layer-by-layer (LbL) assembly of poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrene-sulfonate) (PSS) on a porous polyacrylonitrile (PAN) substrate. In addition, chemical crosslinking LbL polyelectrolyte layers was performed with glutaraldehyde (GA). The resultant crosslinked (the xLbL series) non-crosslinked characterized in terms the substrate morphology structure, separation layer water permeability salt rejection, FO flux solute performance. Both had relatively high (∼ or >7.0 L/m2 h bar). On other hand, showed better more stable MgCl2 leading to low reverse transport over ratio < 6 mM regardless draw solution (DS) concentration membrane orientation). High fluxes achieved for both membranes, where thin finger-like pores adopted minimize internal polarization support layer. xLbL3 (with 3 PAH/PSS deposition layers) an ∼100 L/m2 h active-layer-facing-DS orientation 2 3 M distilled as feed water, which clearly demonstrates potential applications.