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Efficient Removal of Copper Ion from Wastewater Using a Stable Chitosan Gel Material.

ABSTRACT: : Gel adsorption is an efficient method for the removal of metal ion. In the present study, a functional chitosan gel material (FCG) was synthesized successfully, and its structure was detected by different physicochemical techniques. The as-prepared FCG was stable in acid and alkaline media. The as-prepared material showed excellent adsorption properties for the capture of Cu²⁺ ion from aqueous solution. The maximum adsorption capacity for the FCG was 76.4 mg/g for Cu²⁺ ion (293 K). The kinetic adsorption data fits the Langmuir isotherm, and experimental isotherm data follows the pseudo-second-order kinetic model well, suggesting that it is a monolayer and the rate-limiting step is the physical adsorption. The separation factor (R_L) for Langmuir and the 1/n value for Freundlich isotherm show that the Cu²⁺ ion is favorably adsorbed by FCG. The negative values of enthalpy (?H°) and Gibbs free energy (?G°) indicate that the adsorption process are exothermic and spontaneous in nature. Fourier transform infrared (FTIR) spectroscopy and x-ray photoelectron spectroscopy (XPS) analysis of FCG before and after adsorption further reveal that the mechanism of Cu²⁺ ion adsorption. Further desorption and reuse experiments show that FCG still retains 96% of the original adsorption following the fifth adsorption-desorption cycle. All these results indicate that FCG is a promising recyclable adsorbent for the removal of Cu²⁺ ion from aqueous solution.

SUBMITTER: Yang Z

PROVIDER: S-EPMC6930644 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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Efficient Removal of Copper Ion from Wastewater Using a Stable Chitosan Gel Material.

Yang Zujin Z Chai Yuxin Y Zeng Lihua L Gao Zitao Z Zhang Jianyong J Ji Hongbing H

Molecules (Basel, Switzerland) 20191120 23

: Gel adsorption is an efficient method for the removal of metal ion. In the present study, a functional chitosan gel material (FCG) was synthesized successfully, and its structure was detected by different physicochemical techniques. The as-prepared FCG was stable in acid and alkaline media. The as-prepared material showed excellent adsorption properties for the capture of Cu2+ ion from aqueous solution. The maximum adsorption capacity for the FCG was 76.4 mg/g for Cu2+</ ...[more]

PMID: 31756932

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Efficient Removal of Copper Ion from Wastewater Using a Stable Chitosan Gel Material.

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Efficient Removal of Copper Ion from Wastewater Using a Stable Chitosan Gel Material.

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