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Adsorption of Hexavalent Chromium on Cationic Cross-linked Starches of Different Botanic Origins by Rima Klimaviciute; Joana Bendoraitiene; Ramune Rutkaite; Algirdas Zemaitaitis is a Environmental Science article available to read on EtoBox.

What is Adsorption of Hexavalent Chromium on Cationic Cross-linked Starches of Different Botanic Origins about?

The influence of origin of native starch used to obtain cationic cross-linked starch (CCS) on the adsorption of Cr(VI) onto CCS has been investigated. CCS granule size is influenced by the botanic source of native starch. The equilibrium adsorption of Cr(VI) onto CCS was described by the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin models. The more equal the adsorption energy of the quaternary ammonium groups in CCS granule as indicated by low value of change of Temkin adsorption energy DeltaE(T) the greater amount of Cr(VI) was adsorbed onto CCS. The value of DeltaE(T) decreased and sorption capacity of CCS increased with the decrease of CCS granule size and with the increase of number of amorphous regions in CCS granules. The affinity of dichromate anions increases and adsorption proceeds more spontaneously when Cr(VI) is adsorbed onto more amorphous CCS. Adsorption process of Cr(VI) onto such CCS is more exothermic and order of system undergoes major changes during adsorption. After the adsorption on CCS Cr(VI) could be regenerated by incineration at temperature of 800 degrees C.

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Author

Rima Klimaviciute; Joana Bendoraitiene; Ramune Rutkaite; Algirdas Zemaitaitis

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2010

Language

EN

Field

Environmental Science (Physical Sciences)