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. 2021 Nov 4;7(4):197.
doi: 10.3390/gels7040197.

Synthesis of Oxidant Functionalised Cationic Polymer Hydrogel for Enhanced Removal of Arsenic (III)

Yu Song  1 , Takehiko Gotoh  1 , Satoshi Nakai  1
Affiliations

Synthesis of Oxidant Functionalised Cationic Polymer Hydrogel for Enhanced Removal of Arsenic (III)

Yu Song et al. Gels. .

Abstract

A cationic polymer gel (N-[3-(dimethylamino)propyl]acrylamide, methyl chloride quaternary)(DMAPAA-Q gel)-supported oxidising agent (KMnO4 or K2Cr2O7) was proposed to remove As from water. The gel could adsorb arsenite, As(III), and arsenate, As(V), through the ion exchange method, where the oxidising agent oxidised As(III) to As(V). theoretically speaking, the amount of oxidant in the gels can reach 73.7 Mol%. The maximal adsorption capacity of the D-Mn gel (DMAPAA-Q gel carrying MnO4-) and D-Cr gel (DMAPAA-Q gel carrying Cr2O72-) for As(III) could reach 200 mg g-1 and 263 mg g-1, respectively; moreover, the As(III) removal rate of the gels could still be maintained above 85% in a neutral or weak acid aquatic solution. Studies on the kinetic and adsorption isotherms indicated that the As adsorption by the D-Mn and D-Cr gels was dominated by chemisorption. The thermodynamic parameters of adsorption confirmed that the adsorption was an endothermic process. The removal of As is influenced by the co-existing high-valence anions. Based on these results, the gels were found to be efficient for the As(III) adsorption and could be employed for the As(III) removal from the industrial wastewater.

Keywords: Langmuir model; arsenic removal; co-existing ions; hydrogel; kinetics; oxidant.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) As(III) and (b) As(V) speciation as a function of the solution pH [24].
Figure 2
Figure 2
Effect of pH on the As(III) removal rate of the (A) D-Mn and (B) D-Cr gels.
Scheme 1
Scheme 1
Schematic representation of the effect of high Cl− ion concentration on the As adsorption of the D-Mn gel.
Scheme 2
Scheme 2
Schematic representation of the effect of high H+ ion concentration on the As adsorption of the D-Mn gel.
Figure 3
Figure 3
Isotherms of the As(III) adsorption in the (A) D-Mn and (B) D-Cr gels at different temperatures.
Figure 4
Figure 4
Langmuir isotherm plots for the As(III) adsorption in (A) D-Mn and (B) D-Cr gels at different temperatures.
Figure 5
Figure 5
Adsorption kinetics of (A) D-Mn and (B) D-Cr gels; plots of the pseudo-first-order dynamic model of (C) D-Mn and (D) D-Cr gels; plots of the pseudo-second-order dynamic model of (E) D-Mn and (F) D-Cr gels.
Figure 6
Figure 6
Comparison of the adsorption kinetics of the D-Mn and D-Cr gels at the initial As(III) concentration of (A) 20 mg L−1 and (B) 100 mg L−1, respectively.
Figure 7
Figure 7
Effect of temperature on the distribution of the adsorption coefficient of the D-Mn (triangles) and D-Cr gels (circles).
Figure 8
Figure 8
Effect of co-existing ions on the As removal property of the D-Mn gel.
Figure 9
Figure 9
Effect of co-existing ions on As removal by the D-Cr gel.
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