Journal
ACS OMEGA
Volume 5, Issue 22, Pages 13077-13086Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c01013
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Funding
- National Natural Science Foundation of China [21808072]
- Natural Science Foundation of Fujian Province [2019J01075]
- Quanzhou City Science & Technology Program of China [2018C124R, 2018C129R]
- Postgraduates' Innovative Fund in Scientific Research of Huaqiao University
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In this work, we have developed a novel and facile method to prepare gallic acid-grafted chitosan/polysulfone (PS) composite membranes for dye removal from aqueous solutions. First, the gallic acid was grafted onto the eco-friendly chitosan through a free-radical grafting copolymerization reaction. Second, the gallic acid-grafted chitosan conjugates were codeposited onto the top surface of PS substrates by electrostatic interactions in order to transform the ultrafiltration membrane to the thin and defect-free nanofiltration membrane. The morphology and chemical composition of the as-prepared composite membranes were fully characterized by various spectroscopy and microscopy techniques. Moreover, after the optimization of preparation parameters, the obtained membrane displayed a high rejection of 97.2% for Congo red with a high permeance of 14.0 L h(-1) m(-2) bar(-1). Furthermore, the composite membranes also exhibited good rejections for other dyes with different molecular weights such as Evan blue (97.3%), Acid red 94 (97.6%), and Alcian blue 8GX (98%) on the basis of size exclusion, accompanied with good permeance of 12.9, 11.9, and 10.9 L h(-1) m(-2) bar(-1), respectively, which shows potential for scale-up industrial applications.
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