Citation: ZHOU Liang-Chun, MENG Xiang-Guang, LI Jian-Mei, HU Wei, LIU Bo, DU Juan. Kinetics and Thermodynamics of Adsorption of Chlorophenols onto β-Cyclodextrin Modified Chitosan[J]. Acta Physico-Chimica Sinica, ;2012, 28(07): 1615-1622. doi: 10.3866/PKU.WHXB201204282 shu

Kinetics and Thermodynamics of Adsorption of Chlorophenols onto β-Cyclodextrin Modified Chitosan

1.
1College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
2. School of Chemistry and Pharmaceutical Engineering, Sichuan University of Science & Engineering, Zi ng 643000, Sichuan Province, P. R. China

Received Date: 5 March 2012
Available Online: 28 April 2012
Fund Project: 国家自然科学基金(21073126) (21073126)四川省自贡市科学技术局重点基金(10X01)资助项目 (10X01)

β-Cyclodextrin (β-CD) modified chitosan (CS), β-cyclodextrin-6-chitosan (CS-CD), was prepared and subsequently characterized by Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) analysis. The CS-CD was used as an adsorbent for the adsorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (DCP), and 2,4,6-tuichlorophenol (TCP) from aqueous solutions. The Langmuir and Freundlich models were applied to describe the adsorption isotherms of the chlorophenols. The adsorption parameters have also been evaluated. The calculated maximum adsorption capacities for 2-CP, DCP, and TCP on CS-CD were 14.51, 50.68, and 74.29 mg·g^-1, respectively, indicating that the introduction of the β-CD moiety greatly increased the adsorption efficiency. Kinetic studies showed that the adsorptions were fast, in that all of the adsorption equilibria were reached within one hour, and that the adsorption processes followed a pseudosecond- order kinetic model. The thermodynamic parameters ΔG⁰, ΔH⁰, and ΔS⁰ were also calculated. The negative ΔG⁰ values indicated that all of the adsorption processes were spontaneous. A possible adsorption mechanism has been provided and discussed. The effects of electrolytes and pH values on adsorption revealed that hydrogen bonding between the chlorophenols and CS-CD dominated the adsorption process, which was further confirmed by FT-IR analysis. The adsorbent could be regenerated by washing with ethanol. Following six cycles of usage and regeneration, the mass and adsorption efficiency of the CS-CD remained at 90% and 82%, respectively. CS, however, showed greater mass loss and efficiency reduction following regeneration.
- Chitosan,
- β-Cyclodextrin,
- Adsorption,
- Chlorophenols,
- Thermodynamics,
- Kinetics
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