Scavenging Mechanism of Textile Dyes in Water by Enol-Keto Tautomerism Covalent Organic Framework/Chitosan Composites 


Vol. 24,  No. 6, pp. 2039-2054, Jun.  2023
10.1007/s12221-023-00193-w


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  Abstract

In view of the serious environmental pollution caused by organic dyestuff in textile printing and dyeing wastewater, a kind of covalent organic framework (COF) with high water stability—TpPa COF was synthesized by a combination of reversible Schiff-base reaction and irreversible enol-keto tautomerism. The TpPa COF was mechanically blended with chitosan (CS) and was used as a composite adsorbent, i.e., TpPa COF/CS. The aqueous solutions containing acid mordant brown (AMB) dye and methylene blue (MB) dye were employed to simulate anionic and cationic dyeing wastewater, respectively. The adsorption mechanism of TpPa COF/CS composites for the anionic and cationic dyes was investigated and the adsorption thermodynamics and kinetics were studied. The TpPa COF/CS composites (WCOF/WCS: 1/4 and 2/1) exhibited high adsorbing capacities (qmax: 1287.6 and 831.3 mg/g) for AMB and MB dyes at initial pH 4.0 and 9.0, respectively. The adsorption kinetics of both the ionic dyes followed the pseudo-second-order kinetic model well. In addition, the adsorption isotherms of both the dyes fitted well with Langmuir model. The COF/CS composite adsorbent was a promising economical material for the removal of ionic dyes from aqueous solutions.

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  Cite this article

[IEEE Style]

Z. Ji, M. Li, X. Li, E. Jin, W. Linghu, "Scavenging Mechanism of Textile Dyes in Water by Enol-Keto Tautomerism Covalent Organic Framework/Chitosan Composites," Fibers and Polymers, vol. 24, no. 6, pp. 2039-2054, 2023. DOI: 10.1007/s12221-023-00193-w.

[ACM Style]

Zhihao Ji, Manli Li, Xiaohong Li, Enqi Jin, and Wensheng Linghu. 2023. Scavenging Mechanism of Textile Dyes in Water by Enol-Keto Tautomerism Covalent Organic Framework/Chitosan Composites. Fibers and Polymers, 24, 6, (2023), 2039-2054. DOI: 10.1007/s12221-023-00193-w.

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