Selective removal of phenol by spherical particles of <italic>α</italic>-, <italic>β</italic>- and <italic><bold>BoldItalic</bold></italic>-cyclodextrin polymers: kinetics and isothermal equilibrium

doi:10.1007/s11705-013-1318-5

Front Chem Sci Eng

2013, Vol. 7

Issue (2) : 162-169 https://doi.org/10.1007/s11705-013-1318-5

RESEARCH ARTICLE

Selective removal of phenol by spherical particles of α-, β- and BoldItalic-cyclodextrin polymers: kinetics and isothermal equilibrium

Qingchuan CHEN, Yicun WEN, Yu CANG, Li LI, Xuhong GUO, Rui ZHANG(

)

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

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Abstract

Spherical particles of α-, β- and γ-cyclodextrin (CD) polymers to efficiently remove phenol from waste water were prepared by reverse suspension polymerization with epichlorohydrin as crosslinker in liquid paraffin. By controlling the amounts of crosslinker and water, well-defined spherical polymer particles with controllable size were obtained. Due to the selective inclusion associations between CD groups and phenol, these CD spherical polymer particles were demonstrated to be ideal candidates for removal of phenol. Among them β-CD polymer particles showed the best performance. The kinetics and isothermal equilibrium models were used to fit the experimental data of phenol removal from aqueous solution using these CD polymer particles. It was found that the kinetics followed the Ho and Mckay equation, suggesting that the adsorption process of phenol was controlled by diffusion and the host-guest interaction between CD and phenol. Equilibrium isothermal data can be well fitted by the Freundlich equation. The negative free energy change indicated the spontaneous nature of adsorption of phenol by α-, β- and γ-CD spherical polymer particles, while the lowest free energy for β-CD polymer reflected its best adsorption ability, compared to α- and γ-CD polymer particles.

Keywords cyclodextrin polymer particles phenol kinetic models adsorption isotherm equilibrium models

Corresponding Author(s): ZHANG Rui,Email:r.zhang@ecust.edu.cn

Issue Date: 05 June 2013

Cite this article:

Qingchuan CHEN,Yicun WEN,Yu CANG, et al. Selective removal of phenol by spherical particles of α-, β- and BoldItalic-cyclodextrin polymers: kinetics and isothermal equilibrium[J]. Front Chem Sci Eng, 2013, 7(2): 162-169.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1318-5
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I2/162

Fig.1 Preparation and appearances of CD polymer particles. (a) Schematic representation of the preparation of CD polymer particles; (b) -CD polymer particles; (c) -CD polymer particles; (d) -CD polymer particles

Fig.2 Appearances of CD polymer particles with different amounts of water and crosslinker. (a) -CD polymer with 29 g water; (b) -CD polymer with 14.5 g water; (c) -CD polymer with 20.2 g crosslinker; (d) -CD polymer with 27.4 g crosslinker

Fig.3 Phenol concentration as a function of contact time with spherical -CD polymer particles (the initial phenol concentration was 100 mg/L)

Fig.4 Symbols denote: (○) 10 mg/L; (□) 20 mg/L; (?) 40 mg/L; (●) 50 mg/L; (?) 60 mg/L; (?) 80 mg/L and (+) 100 mg/L
Kinetics of phenol adsorption by spherical CD polymer particles at various initial phenol concentrations. (a) -CD polymer; (b) -CD polymer; (c) -CD polymer

Fig.5 Fitting of the phenol adsorption data for spherical -CD polymer particles by the Ho and McKay equation. The solid line is a linear fitting line compared with the result of experiment of spot.

Tab.1 Fitting parameters of phenol adsorption data by Ho and McKay model

Fig.6 Adsorption of phenol onto spherical -CD polymer particles fitted by (a) Freundlich isotherms model and (b) Langmuir isotherm model.

Tab.2 Parameters fitted by Freundlich isotherms

Fig.7 Freundlich isotherms for the adsorption of phenol by spherical -, - and -CD polymer particles. The solid line is a linear line fitting to the experimental spots.

Fig.8 Symbols denote: (○) -CD polymer; (□) -CD polymer; (?) -CD polymer
Adsorption ability of phenol by spherical CD polymer particles as a function of regeneration times

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