Adsorption equilibrium, kinetics, and dynamic separation of Ca2+ and Mg2+ ions from phosphoric acid-nitric acid aqueous solution by strong acid cation resin

doi:10.1016/j.cjche.2018.12.025

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (12): 2930-2936.DOI: 10.1016/j.cjche.2018.12.025

• Separation Science and Engineering • 上一篇下一篇

Adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution by strong acid cation resin

Rui Lü¹, Qing Xi¹, Tan Li¹, Rui Li¹, Xiaochao Zhang¹, Jianxin Liu¹, Caimei Fan¹, Junqiang Feng², Lingyun Zhang², Zhihua Wang³

1 College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2 Shenzhen Batian Ecological Engineering Co. Ltd., Shenzhen 518057, China;
3 Tianji Coal Chemical Group Co. Ltd., Changzhi 047507, China

收稿日期:2018-10-29 修回日期:2018-12-07 出版日期:2019-12-28 发布日期:2020-03-17
通讯作者: Caimei Fan
基金资助:
Supported by a grant from Tianji Coal Chemical Group Co. Ltd. (Project no. 2012-1978) and Shenzhen Batian Ecological Engineering Co., Ltd. (Project no. 2013-0909).

Adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution by strong acid cation resin

Rui Lü¹, Qing Xi¹, Tan Li¹, Rui Li¹, Xiaochao Zhang¹, Jianxin Liu¹, Caimei Fan¹, Junqiang Feng², Lingyun Zhang², Zhihua Wang³

1 College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2 Shenzhen Batian Ecological Engineering Co. Ltd., Shenzhen 518057, China;
3 Tianji Coal Chemical Group Co. Ltd., Changzhi 047507, China

Received:2018-10-29 Revised:2018-12-07 Online:2019-12-28 Published:2020-03-17
Contact: Caimei Fan
Supported by:
Supported by a grant from Tianji Coal Chemical Group Co. Ltd. (Project no. 2012-1978) and Shenzhen Batian Ecological Engineering Co., Ltd. (Project no. 2013-0909).

摘要/Abstract

摘要： The separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution is very significant for the neutralization process of nitrophosphate fertilizer. This paper studied the adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions by strong acid cation resin, and the effects of phosphoric acid and nitric acid on the adsorption process were investigated. The results reveal that the adsorption process of Ca²⁺ and Mg²⁺ ions in pure water on resin is in good agreement with the Langmuir isotherm model and their maximal adsorption capacities are 1.86 mmol·g^-1 and 1.83 mmol·g^-1, respectively. The adsorption kinetics of Ca²⁺ and Mg²⁺ ions on resin fits better with the pseudo-first-order model, and the adsorption equilibrium in pure water is reached within 10 min contact time, while at the present of phosphoric acid, the adsorption rate of Ca²⁺ and Mg²⁺ ions on resin will go down. The dynamic separation experiments demonstrate that the designed column adsorption is able to undertake the separation of metal ions from the mix acids aqueous solution, but the dynamic operation should control the flow rate of mix acid solution. Besides nitric acid solution was proved to be effective to completely regenerate the spent resin and achieve the recyclable operation of separation process.

关键词: Ca²⁺ and Mg²⁺ ions, Strong acid cation resin, Adsorption equilibrium, Kinetics, Dynamic separation

Abstract: The separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution is very significant for the neutralization process of nitrophosphate fertilizer. This paper studied the adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions by strong acid cation resin, and the effects of phosphoric acid and nitric acid on the adsorption process were investigated. The results reveal that the adsorption process of Ca²⁺ and Mg²⁺ ions in pure water on resin is in good agreement with the Langmuir isotherm model and their maximal adsorption capacities are 1.86 mmol·g^-1 and 1.83 mmol·g^-1, respectively. The adsorption kinetics of Ca²⁺ and Mg²⁺ ions on resin fits better with the pseudo-first-order model, and the adsorption equilibrium in pure water is reached within 10 min contact time, while at the present of phosphoric acid, the adsorption rate of Ca²⁺ and Mg²⁺ ions on resin will go down. The dynamic separation experiments demonstrate that the designed column adsorption is able to undertake the separation of metal ions from the mix acids aqueous solution, but the dynamic operation should control the flow rate of mix acid solution. Besides nitric acid solution was proved to be effective to completely regenerate the spent resin and achieve the recyclable operation of separation process.

Key words: Ca²⁺ and Mg²⁺ ions, Strong acid cation resin, Adsorption equilibrium, Kinetics, Dynamic separation

Rui Lü, Qing Xi, Tan Li, Rui Li, Xiaochao Zhang, Jianxin Liu, Caimei Fan, Junqiang Feng, Lingyun Zhang, Zhihua Wang. Adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution by strong acid cation resin[J]. 中国化学工程学报, 2019, 27(12): 2930-2936.

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Adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution by strong acid cation resin

Adsorption equilibrium, kinetics, and dynamic separation of Ca²⁺ and Mg²⁺ ions from phosphoric acid-nitric acid aqueous solution by strong acid cation resin

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