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Enhanced adsorption of Cr (VI) from aqueous solution by zirconium impregnated chitosan microspheres: mechanism and equilibrium

Enhanced adsorption of Cr (VI) from aqueous solution by zirconium impregnated chitosan microspheres: mechanism and equilibrium
Enhanced adsorption of Cr (VI) from aqueous solution by zirconium impregnated chitosan microspheres: mechanism and equilibrium
The present paper reports a novel adsorbent that is synthesized with chitosan and zirconium ions through a simple method, for the removal of Cr (VI) ions from solutions. In this study, the effects of solution pH, absorbent dosage, contact time, and initial concentration were evaluated through a series of experiments. The modified chitosan was also characterized by SEM-EDS, FTIR, TG, and XPS. It is found that the Cr (VI) adsorption capacity by Zr-CS of 230.41 mg/g, was achieved at pH 4.5. The adsorption results indicated that the adsorption process was in line with Langmuir isotherm at 25°C. At the same time, the kinetic studies indicated that the adsorption process followed a pseudo-second-order model. Therefore, Zr-CS is a very promising adsorbent for the treatment of chromium-containing wastewater. XPS and element spectrum images, however, showed the difference between the adsorbent before and after Cr (VI) adsorption. According to the data, the adsorption should include electrostatic interaction between protonated amino and Cr (VI) as well as complexation of Zr with Cr (VI). According to the experimental data, it is believed that zirconium-modified chitosan adsorbent is an effective adsorbent for removing chromium ions in the solution.
Cr (VI), Zr, adsorption, chitosan, complexation, electrostatic interaction
0149-6395
Zhang, Yingting
5224288d-4499-4f0b-a124-d354f1ee0f0b
Lan, Guihong
fd98a25b-e8f1-4a24-a163-a73f2048b130
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Zhang, Tailiang
0b939c0b-a17e-4da8-b186-e69735479012
Qiu, Haiyan
f680b343-6dce-4f0f-a73d-c6aa519db8d2
Li, Feng
e06a32f5-0883-4a8f-a6ba-385a9df3ecfc
Yan, Junhua
cc26e013-fd65-4fa7-9dd4-8e4ef9b55435
Zhang, Yingting
5224288d-4499-4f0b-a124-d354f1ee0f0b
Lan, Guihong
fd98a25b-e8f1-4a24-a163-a73f2048b130
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Zhang, Tailiang
0b939c0b-a17e-4da8-b186-e69735479012
Qiu, Haiyan
f680b343-6dce-4f0f-a73d-c6aa519db8d2
Li, Feng
e06a32f5-0883-4a8f-a6ba-385a9df3ecfc
Yan, Junhua
cc26e013-fd65-4fa7-9dd4-8e4ef9b55435

Zhang, Yingting, Lan, Guihong, Liu, Yongqiang, Zhang, Tailiang, Qiu, Haiyan, Li, Feng and Yan, Junhua (2020) Enhanced adsorption of Cr (VI) from aqueous solution by zirconium impregnated chitosan microspheres: mechanism and equilibrium. Separation Science and Technology. (doi:10.1080/01496395.2020.1842451).

Record type: Article

Abstract

The present paper reports a novel adsorbent that is synthesized with chitosan and zirconium ions through a simple method, for the removal of Cr (VI) ions from solutions. In this study, the effects of solution pH, absorbent dosage, contact time, and initial concentration were evaluated through a series of experiments. The modified chitosan was also characterized by SEM-EDS, FTIR, TG, and XPS. It is found that the Cr (VI) adsorption capacity by Zr-CS of 230.41 mg/g, was achieved at pH 4.5. The adsorption results indicated that the adsorption process was in line with Langmuir isotherm at 25°C. At the same time, the kinetic studies indicated that the adsorption process followed a pseudo-second-order model. Therefore, Zr-CS is a very promising adsorbent for the treatment of chromium-containing wastewater. XPS and element spectrum images, however, showed the difference between the adsorbent before and after Cr (VI) adsorption. According to the data, the adsorption should include electrostatic interaction between protonated amino and Cr (VI) as well as complexation of Zr with Cr (VI). According to the experimental data, it is believed that zirconium-modified chitosan adsorbent is an effective adsorbent for removing chromium ions in the solution.

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Accepted/In Press date: 21 October 2020
e-pub ahead of print date: 4 November 2020
Keywords: Cr (VI), Zr, adsorption, chitosan, complexation, electrostatic interaction

Identifiers

Local EPrints ID: 445559
URI: http://eprints.soton.ac.uk/id/eprint/445559
ISSN: 0149-6395
PURE UUID: 02849001-722e-4d13-a6a0-9470b5641075

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Date deposited: 16 Dec 2020 17:31
Last modified: 16 Dec 2020 17:31

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