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Title: Adsorption and desorption of humic acid on aminated polyacrylonitrile fibers
Authors: Deng, S. 
Bai, R. 
Keywords: Adsorption
Humic acid removal
Polyacrylonitrile fibers
Surface modification
Issue Date: 1-Dec-2004
Citation: Deng, S., Bai, R. (2004-12-01). Adsorption and desorption of humic acid on aminated polyacrylonitrile fibers. Journal of Colloid and Interface Science 280 (1) : 36-43. ScholarBank@NUS Repository.
Abstract: Aminated polyacrylonitrile fibers (APANFs) were prepared by surface modification and were used as an adsorbent to remove humic acid from aqueous solutions. The APANFs were found to be very effective in removing humic acid at the pH range from 2 to 10. The adsorption isotherm obeyed both the Langmuir and Freundlich models, and the adsorption kinetics followed an initial diffusion-controlled and then an attachment-controlled adsorption pattern. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy revealed that chemical bonds were formed between the nitrogen atoms in the amine groups on the fibers and humic acid molecules adsorbed, suggesting that, besides electrostatic interaction, surface complexation also played an important role in humic acid adsorption on the APANFs. The humic acid adsorbed on the APANFs can be effectively desorbed in a 0.1 M NaOH solution, and the regenerated APANFs can be reused in the subsequent adsorption cycles without significant loss of the adsorption capacities. © 2004 Elsevier Inc. All rights reserved.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2004.07.007
Appears in Collections:Staff Publications

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