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Study of Adsorption Characteristics of Cadmium into Chitosan biopolymer to be used for waste water treatments

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dc.contributor.author Adikary, SU
dc.contributor.author Unagolla, JM
dc.date.accessioned 2018-06-12T18:48:15Z
dc.date.available 2018-06-12T18:48:15Z
dc.identifier.uri http://dl.lib.mrt.ac.lk/handle/123/13155
dc.description.abstract Pollution by heavy metals is a serious threat to aquatic ecosystems because some of these metals are potentially toxic even at very low concentrations. Chitosan, a biopolymer produced from crustacean shells, has applications in various areas, particularly in drinking water and wastewater treatment due to its ability to remove metallic ions from solutions. The purpose of this research work was to study the adsorption of cadmium on chitosan produced from shrimp shells at a laboratory level. Chitosan, with a degree of deacetylation of approximately 70%, was used in the experimental part and the flake sizes were smaller than 0.25mm. Experimental work involved the determination of the adsorption isotherms for each metallic ion in a batch system. The resulting isotherms were fitted using Langmuir model and the parameters of the equation were determined. Kinetic studies of adsorption for metallic ions at different concentrations and with different particle sizes were performed in batch system. Simplified models such as pseudo-first-order, pseudo-secondorder, and intra-particle diffusion equations were used to determine the rate controlling step. The results showed that the adsorption capacity depends strongly on pH and on the species of metallic ions in the solution. Batch adsorption experiments were performed at two differentdegrees of deacetylation (DD) values, time period ranging from 15 minutes to 3 hours and pH of solutions ranging from 3 to 7. The study showed that the solution pH strongly affects the adsorption capacity of chitosan. en_US
dc.language.iso en en_US
dc.subject Adsorption; Chitosan, Heavy metal, Isotherms, Kinetic models en_US
dc.title Study of Adsorption Characteristics of Cadmium into Chitosan biopolymer to be used for waste water treatments en_US
dc.type Article-Abstract en_US
dc.identifier.year 2013 en_US
dc.identifier.journal Annual Transactions of IESL, The Institution of Engineers, Sri Lanka en_US
dc.identifier.pgnos pp. 313 - 319 en_US


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