Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres

doi:10.1016/j.cjche.2016.08.024

›› 2017, Vol. 25 ›› Issue (2): 153-158.DOI: 10.1016/j.cjche.2016.08.024

• Selected Papers from the International Chemical Separation Technology Conference (ICSTC) • 上一篇下一篇

Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres

Chao Hua^1,2, Runhu Zhang³, Fang Bai^1,2, Ping Lu^1,2, Xiangfeng Liang¹

1 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, Tianjin 300130, China;
3 Department of Chemical Engineering, Kunming Metallurgy College, Kunming 650033, China

收稿日期:2016-07-16 修回日期:2016-08-30 出版日期:2017-02-28 发布日期:2017-03-14
通讯作者: Chao Hua
基金资助:
Supported by the National Key Basic Research Development Plan (No. 2013CB632602), and the National Natural Science Foundation of China (No. 21306198).

Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres

Chao Hua^1,2, Runhu Zhang³, Fang Bai^1,2, Ping Lu^1,2, Xiangfeng Liang¹

1 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, Tianjin 300130, China;
3 Department of Chemical Engineering, Kunming Metallurgy College, Kunming 650033, China

Received:2016-07-16 Revised:2016-08-30 Online:2017-02-28 Published:2017-03-14
Supported by:
Supported by the National Key Basic Research Development Plan (No. 2013CB632602), and the National Natural Science Foundation of China (No. 21306198).

摘要/Abstract

摘要： In this study, quaternized chitosan microspheres (QCMS) were prepared and its Cr(VI) removal potential was investigated. Batch experiments were conducted to examine kinetics, adsorption isotherm, pH effect, and thermodynamic parameters. Equilibrium was attained within 50 min and maximum removal of 97.34% was achieved under the optimum conditions at pH 5. Adsorption data for Cr (VI) uptake by the QCMS were analyzed according to Langmuir, Freundlich, and Temkin adsorption models. The maximum uptake of Cr(VI) was 39.1 mg·g^-1. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K, 313 K and 323 K. (ΔH°=16.08 kJ·mol^-1;ΔG°=-5.84 to -8.08 kJ·mol^-1 and ΔS°=74.81 J·K^-1·mol^-1). So the positive values of both ΔH° and ΔS° suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption.ΔG° values obtainedwere negative indicating a spontaneous adsorption process. The kinetic process was described by a pseudo-second-order rate equation very well. The results of the present study indicated that the QCMS could be considered as a potential adsorbent for Cr (VI) in aqueous solutions.

关键词: Chromium (VI), Adsorption, Quaternized chitosan microspheres, Isotherms, Thermodynamics

Abstract: In this study, quaternized chitosan microspheres (QCMS) were prepared and its Cr(VI) removal potential was investigated. Batch experiments were conducted to examine kinetics, adsorption isotherm, pH effect, and thermodynamic parameters. Equilibrium was attained within 50 min and maximum removal of 97.34% was achieved under the optimum conditions at pH 5. Adsorption data for Cr (VI) uptake by the QCMS were analyzed according to Langmuir, Freundlich, and Temkin adsorption models. The maximum uptake of Cr(VI) was 39.1 mg·g^-1. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K, 313 K and 323 K. (ΔH°=16.08 kJ·mol^-1;ΔG°=-5.84 to -8.08 kJ·mol^-1 and ΔS°=74.81 J·K^-1·mol^-1). So the positive values of both ΔH° and ΔS° suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption.ΔG° values obtainedwere negative indicating a spontaneous adsorption process. The kinetic process was described by a pseudo-second-order rate equation very well. The results of the present study indicated that the QCMS could be considered as a potential adsorbent for Cr (VI) in aqueous solutions.

Key words: Chromium (VI), Adsorption, Quaternized chitosan microspheres, Isotherms, Thermodynamics

Chao Hua, Runhu Zhang, Fang Bai, Ping Lu, Xiangfeng Liang. Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres[J]. , 2017, 25(2): 153-158.

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Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres

Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres

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