Issue 32, 2022, Issue in Progress

Optimized preparation and performance evaluation of a bifunctional chitosan-modified flocculant

Abstract

In view of the diversification of pollutants in current sewage, further improving the application efficiency of water treatment agents and realizing multi-functionalization are important directions for the research of water treatment agents. In this paper, on the basis of the natural polymer flocculant chitosan, MAPTAC and AM were used as modified monomers to improve its solubility and also enhance its flocculation and bactericidal properties. Furthermore, the preparation conditions of chitosan flocculant poly(CTS-g-AM-MAPTAC) were optimized by response surface methodology, and its flocculation and sterilization functions were evaluated in detail. The experimental results showed that the significance order of the factors in the preparation process was illumination time, mass ratio of total monomer to chitosan, molar ratio of monomers, and initiator concentration. The optimum conditions for preparing poly(CTS-g-AM-MAPTAC) were 6 moL Lāˆ’1 for initiator concentration, 4 for mass ratio of total monomer to chitosan, 25% for monomer molar ratio, and 60 min for illumination time. The intrinsic viscosity and grafting rate of poly(CTS-g-AM-MAPTAC) prepared under optimum conditions were 5.4965 dL gāˆ’1 and 220.34%. The obtained poly(CTS-g-AM-MAPTAC) had good solubility, which could fully expose the active sites in wastewater with different acidity and had good flocculation effect. The performance evaluation results showed that the flocculant had a good combination of flocculation and sterilization, and had the advantages of high turbidity removal and sterilization efficiency, good biodegradability and low reagent consumption.

Graphical abstract: Optimized preparation and performance evaluation of a bifunctional chitosan-modified flocculant

Supplementary files

Article information

Article type
Paper
Submitted
17 Mar 2022
Accepted
29 Jun 2022
First published
21 Jul 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 20857-20865

Optimized preparation and performance evaluation of a bifunctional chitosan-modified flocculant

X. Li, X. Zhang, S. Xie, Y. Ge, L. Feng and W. Li, RSC Adv., 2022, 12, 20857 DOI: 10.1039/D2RA01727J

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