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Adsorption Properties of Aniline onto beta-Cyclodextrin Epichlorohydrin Copolymer

Ning Li, Xiao-Li Xiong, Ruiqi Wang

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Abstract

Batch adsorption experiments were carried out for the removal of aniline from aqueous solutions using beta-cyclodextrin polymer (beta-CDP). Studies concerning the effects of contact time and initial aniline concentration were presented and discussed. Results of batch experiments showed that this adsorbent exhibited some sorption capacities toward aniline. It was found that kinetic followed a pseudo 2ndorder (Ho and McKay) equation, suggesting that the rate-limiting step may be chemisorption. Equilibrium isotherm data were analyzed according to Langmuir, Freundlich and Dubinin-Radushkevich (D-R) equations. The D-R isotherm gave the best correlation for the adsorption of aniline on beta-CDP. The negative value of free energy change indicated the spontaneous nature of adsorption.

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What this paper is about

Batch adsorption experiments were carried out for the removal of aniline from aqueous solutions using beta-cyclodextrin polymer (beta-CDP). Studies concerning the effects of contact time and initial aniline concentration were presented and discussed. Results of batch experiments showed that this adsorbent exhibited some sorption capacities toward aniline. It was found that kinetic followed a pseudo 2ndorder (Ho and McKay) equation, suggesting that the rate-limiting step may be chemisorption. Equilibrium isotherm data were analyzed according to Langmuir, Freundlich and Dubinin-Radushkevich (D-R) equations. The D-R isotherm gave the best correlation for the adsorption of aniline on beta-CDP. The negative value of free energy change indicated the spontaneous nature of adsorption.

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Available abstract

Batch adsorption experiments were carried out for the removal of aniline from aqueous solutions using beta-cyclodextrin polymer (beta-CDP). Studies concerning the effects of contact time and initial aniline concentration were presented and discussed. Results of batch experiments showed that this adsorbent exhibited some sorption capacities toward aniline. It was found that kinetic followed a pseudo 2ndorder (Ho and McKay) equation, suggesting that the rate-limiting step may be chemisorption. Equilibrium isotherm data were analyzed according to Langmuir, Freundlich and Dubinin-Radushkevich (D-R) equations. The D-R isotherm gave the best correlation for the adsorption of aniline on beta-CDP. The negative value of free energy change indicated the spontaneous nature of adsorption.

Key concepts: Aniline, Adsorption, Freundlich equation, Epichlorohydrin, Langmuir, Aqueous solution, Sorption, Chemisorption

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