DocumentCode :
2710158
Title :
Adsorption of cadmium and lead heavy metals by chitosan biopolymer: A study on equilibrium isotherms and kinetics
Author :
Unagolla, J.M. ; Adikary, S.U.
Author_Institution :
Dept. of Mater. Sci. & Eng., Univ. of Moratuwa, Moratuwa, Sri Lanka
fYear :
2015
fDate :
7-8 April 2015
Firstpage :
234
Lastpage :
239
Abstract :
Since heavy metal pollution is a significant aspect to aquatic ecosystems, the objective of this research work was to investigate adsorption characteristics of chitosan as an alternative adsorbent material. In this study, chitosan, synthesized from locally available shrimp type “penaeus monodon” was used to observe adsorption characteristics of cadmium (Cd) and lead (Pb) heavy metals from aqueous solution. Batch kinetic experiment studies were conducted for changing initial pH, initial concentration of metal ions, particle size and degree of deacetylation (DD) of chitosan. Simplified models such as, pseudo first order, pseudo second order and intra-particle diffusion models were used to analyze the experimental data. The result showed that the adsorption capacity strongly depends on pH and DD. It was clearly seen that higher adsorption of heavy metals occur at comparatively high pH and high DD. Equilibrium experimental data were analyzed by using two different isotherm models namely, Langmuir and Freundlich. The characteristic parameters for each isotherm and related correlation coefficients were determined by using mathematical modeling software. Isotherms show that adsorption process of Cd and Pb is a heterogeneous process.
Keywords :
adsorption; cadmium; chemical equilibrium; lead; pH; particle size; polymers; surface diffusion; Cd; Freundlich model; Langmuir model; Pb; adsorbent material; adsorption capacity; aqueous solution; batch kinetic experiment; chitosan biopolymer; degree-of-deacetylation; equilibrium isotherms; heavy metal pollution; heterogeneous process; intraparticle diffusion model; lead heavy metals; pH; particle size; pseudofirst order diffusion model; pseudosecond order diffusion model; shrimp-type penaeus monodon; Adsorption; Data models; Ions; Kinetic theory; Lead; Mathematical model; Adsorption; chitosan; degree of deacetylation; isotherm;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Moratuwa Engineering Research Conference (MERCon), 2015
Conference_Location :
Moratuwa
Type :
conf
DOI :
10.1109/MERCon.2015.7112351
Filename :
7112351
Link To Document :
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