Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent

doi:10.1016/S1004-9541(13)60516-9

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (6): 594-599.DOI: 10.1016/S1004-9541(13)60516-9

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles Next Articles

Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent

WANG Jiahong^1,2, JI Yanfen¹, DING Shaolan¹, MA Hongrui¹, HAN Xiaojing²

1 College of Resource and Environment, Shaanxi University of Science & Technology, Xi’an 710021, China;
2 Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China

Received:2012-02-09 Revised:2012-10-06 Online:2013-07-03 Published:2013-06-28
Contact: WANG Jiahong
Supported by:
Supported by the National Major Research Plan for Water Pollution Control and Treatment of China (2008ZX07010-003-002), the National Natural Science Foundation of China (21107065) and the Scientific Research Program Funded by Shaanxi Provincial Education Department (HJK0769).

Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent

王家宏^1,2, 吉艳芬¹, 丁绍兰¹, 马宏瑞¹, 韩晓晶²

1 College of Resource and Environment, Shaanxi University of Science & Technology, Xi’an 710021, China;
2 Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China

通讯作者: WANG Jiahong
基金资助:
Supported by the National Major Research Plan for Water Pollution Control and Treatment of China (2008ZX07010-003-002), the National Natural Science Foundation of China (21107065) and the Scientific Research Program Funded by Shaanxi Provincial Education Department (HJK0769).

Abstract

Abstract: Tannic acid is generally considered as one of polyphenolic pollutants, which may cause severe threats to the environment. In this study, polyaniline adsorbent was synthesized by chemical oxidation to remove tannic acid in aqueous solutions. The adsorption amount of tannic acid varied greatly with pH of solution and strong adsorption was at pH 5.8-6.7. Coexisting cations, such as Na⁺, K⁺, and Ca²⁺, can enhance the adsorption of tannic acid on polyaniline, which may be contributed to the electrostatic interaction between tannic acid and polyaniline. The adsorption process could be well described by Langmuir model and the maximum adsorption capacity was 117.65 mg·g^-1 at 35℃ and pH 6.0. The thermodynamic parameters calculated from the adsorption isotherms indicate that the adsorption of tannic acid is spontaneous and endothermic process. The polyaniline saturated with tannic acid can be desorbed in alkaline solution and regenerated adsorbent can be used repeatedly with high adsorption capacity, which implies that polyaniline adsorbents have a great potential in water purification for the removal of tannic acid.

Key words: polyaniline, adsorption, desorption, tannic acid

摘要： Tannic acid is generally considered as one of polyphenolic pollutants, which may cause severe threats to the environment. In this study, polyaniline adsorbent was synthesized by chemical oxidation to remove tannic acid in aqueous solutions. The adsorption amount of tannic acid varied greatly with pH of solution and strong adsorption was at pH 5.8-6.7. Coexisting cations, such as Na⁺, K⁺, and Ca²⁺, can enhance the adsorption of tannic acid on polyaniline, which may be contributed to the electrostatic interaction between tannic acid and polyaniline. The adsorption process could be well described by Langmuir model and the maximum adsorption capacity was 117.65 mg·g^-1 at 35℃ and pH 6.0. The thermodynamic parameters calculated from the adsorption isotherms indicate that the adsorption of tannic acid is spontaneous and endothermic process. The polyaniline saturated with tannic acid can be desorbed in alkaline solution and regenerated adsorbent can be used repeatedly with high adsorption capacity, which implies that polyaniline adsorbents have a great potential in water purification for the removal of tannic acid.

关键词: polyaniline, adsorption, desorption, tannic acid

WANG Jiahong, JI Yanfen, DING Shaolan, MA Hongrui, HAN Xiaojing . Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent[J]. Chin.J.Chem.Eng., 2013, 21(6): 594-599.

王家宏, 吉艳芬, 丁绍兰, 马宏瑞, 韩晓晶. Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent[J]. Chinese Journal of Chemical Engineering, 2013, 21(6): 594-599.

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Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent

Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent

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