SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (6): 594-599.DOI: 10.1016/S1004-9541(13)60516-9

• 分离科学与工程 • 上一篇    下一篇

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. 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
  • 收稿日期:2012-02-09 修回日期:2012-10-06 出版日期:2013-06-28 发布日期:2013-07-03
  • 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).

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

WANG Jiahong1,2, JI Yanfen1, DING Shaolan1, MA Hongrui1, HAN Xiaojing2   

  1. 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:2013-06-28 Published:2013-07-03
  • 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).

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

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