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ADSORPTION KINETICS OF FLUORIDE ION USING LANTHANUM-MODIFIED CHITOSAN

Dongdong Ma

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Abstract

The water containing high fluoride ions was treated by the applicability of lanthanum-modified chitosan. The treatment conditions were optimized:pH value was 7,temperature was at 323K,and contact time was 60min. The equilibrium adsorption data were fitted reasonably well for Langmuir isotherm model,the maximum adsorption capacity for F-was 476.190mg/g. Adsorption kinetics study revealed that the adsorption process followed pseudo-second-order model,the adsorption process was complex,both the boundary of liquid film and intraparticle diffusion contributed to the rate-determining step.

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What this paper is about

The water containing high fluoride ions was treated by the applicability of lanthanum-modified chitosan. The treatment conditions were optimized:pH value was 7,temperature was at 323K,and contact time was 60min. The equilibrium adsorption data were fitted reasonably well for Langmuir isotherm model,the maximum adsorption capacity for F-was 476.190mg/g. Adsorption kinetics study revealed that the adsorption process followed pseudo-second-order model,the adsorption process was complex,both the boundary of liquid film and intraparticle diffusion contributed to the rate-determining step.

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Available abstract

The water containing high fluoride ions was treated by the applicability of lanthanum-modified chitosan. The treatment conditions were optimized:pH value was 7,temperature was at 323K,and contact time was 60min. The equilibrium adsorption data were fitted reasonably well for Langmuir isotherm model,the maximum adsorption capacity for F-was 476.190mg/g. Adsorption kinetics study revealed that the adsorption process followed pseudo-second-order model,the adsorption process was complex,both the boundary of liquid film and intraparticle diffusion contributed to the rate-determining step.

Key concepts: Chemistry, Adsorption, Lanthanum, Kinetics, Fluoride, Diffusion, Langmuir adsorption model, Chitosan

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