Adsorption of Anionic Dyes onto Chitosan-modified Diatomite

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (6): 1035-1040.

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Adsorption of Anionic Dyes onto Chitosan-modified Diatomite

ZHANG Ge-shan¹, XUE Hong-hai¹, TANG Xiao-jian^1,2, PENG Fei¹ and KANG Chun-li^1*

1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P. R. China;
2. School of Municipal and Environmental Engineering, Jilin Institute of Architecture and Civil Engineering, Changchun 130118, P. R. China

Received:2011-01-10 Revised:2011-06-30 Online:2011-11-25 Published:2011-11-07
Contact: KANG Chun-li E-mail:kangcl@jlu.edu.cn
Supported by:
Supported by the Research Fund of Environmental Protection Bureau in Jilin Province, China(No.2007-13).

Abstract

Abstract: The purpose of this work is to study the possibility of anionic dyes Reactive Red M-8B(RR) and Direct Green B(DG) adsorbed on chitosan-modified diatomite. The characteristics of adsorbent, adsorption isotherms and the influence of adsorption time, temperature and pH were researched in this work. The results show that the mo- dified diatomite had a much better adsorption capability than the natural diatomite. The adsorption capacities of chitosan-modified diatomite for RR and DG were 94.46 and 137.0 mg/g, respectively. Both adsorption time and adsorption temperature provided a positive effect on the dye adsorption. Within the experimental pH range, the adsorbance was enhanced at lower pH but reduced sharply at high pH. On the basis of the experimental results and discussion, electrostatic attraction is considered as the main mechanism of this chemisorption.

Key words: Diatomite, Chitosan-modified diatomite, Adsorption, Reactive Red M-8B, Direct Green B

ZHANG Ge-shan, XUE Hong-hai, TANG Xiao-jian, PENG Fei and KANG Chun-li*. Adsorption of Anionic Dyes onto Chitosan-modified Diatomite[J]. Chemical Research in Chinese Universities, 2011, 27(6): 1035-1040.

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Adsorption of Anionic Dyes onto Chitosan-modified Diatomite

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