A loose NF membrane by grafting TiO2-HMDI nanoparticles on PES/β-CD substrate for dye/salt separation

By Luhong Zhang, Hongfang Guan, N. Zhang, B. Jiang, Yongli Sun, Na Yang. Separation and Purification Technology, 2019

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Abstract In this study, a high flux loose nanofiltration (NF) membrane was fabricated for the desalination of dye wastewater through a facile method which combined doping and surface grafting. First, PES ultrafiltration substrate was prepared via non-solvent induced phase separation by introducing multi-hydroxyl β-cyclodextrin (β-CD) into the casting solution as hydrophilic additive. Then, titanium dioxide (TiO2) nanoparticles were grafted uniformly on membrane surface with the assistance of 1, 6-hexamethylene diisocyanate (HMDI), resulting in the enhancement of surface hydrophilicity and separation performance of the resultant membranes. Remarkably, the membrane prepared at optimized conditions achieved a high pure water flux (52.0 L·m−2·h−1 at 0.2 MPa) and high permeate flux for dyes (e.g. 30.5 L·m−2·h−1 for Congo Red at 0.2 MPa). It also exhibited high rejection for dyes (e.g. 97.4% for Congo Red) and high transmittance of salts (e.g. 94.0% for Na2SO4). Moreover, the membrane possessed good antifouling performance with a high flux recovery ratio of 93.7% after fouled by humic acid (HA). The results indicated that the novel loose NF membrane had an impressive potential application for dye wastewater treatment.

Subfields: Biomaterials, Biomedical Engineering, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/b4b7289e619b600f5e750526b1d79f3240713c5f