Title

A novel kind of thin film composite nanofiltration membrane with sulfated chitosan as the active layer material

Document Type

Journal Article

Publisher

Elsevier

Faculty

Faculty of Health, Engineering and Science

School

School of Engineering

RAS ID

15856

Comments

This article was originally published as: Miao, J. , Zhang, L. , & Lin, H. (2013). A novel kind of thin film composite nanofiltration membrane with sulfated chitosan as the active layer material. Chemical Engineering Science, 87, 152-159. Original article available here

Abstract

Nanofiltration (NF) has been used as pretreatment to reverse osmosis (RO) desalination processes for lowering the required pressure. In this work, a novel kind of amphoteric thin-film composite (TFC) NF membranes were prepared through a method of coating and cross-linking using sulfated chitosan (SCS), polysulfone (PS) ultrafiltration (UF) membrane, and epichlorohydrin (ECH) as the active layer material, the base membrane, and the cross-linking agent, respectively. At 0.40MPa and ambient temperature, the rejections of the resultant membrane to Na2SO4 and NaCl solutions (1000mgL-1) were 90.8% and 32.5%, while the permeate fluxes were 22.9 and 58.4kgm-2h-1, respectively. The structure and morphology of the resultant SCS/PS composite NF membranes were characterized with attenuated total reflection infrared spectroscopy (ATR-IR), environmental scanning electron microscopy (ESEM), and atomic force microscopy (AFM). The rejection performances suggested that SCS/PS composite NF membranes cross-linked by ECH have a potential for the separation of mono/divalent inorganic electrolytes from low-molecular-weight organics.

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