Equilibrium and kinetics study of reactive red 123 dye removal from aqueous solution by adsorption on eggshell
Iranian Journal of Environmental Health Science and Engineering. 2011; 8 (2): 101-108
em Inglês
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| ID: emr-109484
ABSTRACT
The aim of this study was to determine the equilibrium and kinetics adsorption of reactive red 123 dye [RR 123] from aqueous solution with chicken's eggshell as an adsorbent. The initial concentrations of reactive red 123 dye were selected in the range of 25 and 50 mg/L. The target adsorbent was prepared in laboratory conditions and pulverized by ASTM standard sieves. Measurement of the adsorbent surface area was carried out via Brunauer Emmett-Teller isotherm. The experimental data were analyzed with Langmuir, Freundlich and Temkin isotherm models. The results showed that the calcium components were the main constituents of eggshell [around 95% Ca]. The experimental adsorption isotherm was in good concordance with Langmuir and Freundlich models [R[2]>0.90] and based on the Langmuir isotherm the maximum amount of adsorption [q[max]] was 1.26 mg/g. Increase of the eggshell dose and the solution temperature beyond 45 Degree C led to decrease of the adsorbed dye per mass unit of the adsorbent, but increase of the solution pH up to 9 led to the improvement of dye adsorption. The kinetic studies revealed that the adsorption of reactive red 123 was rapid and complied with pseudo-second order kinetic [R[2]= 0.99], with the kinetic constant of 0.02 g/mg.min
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IMEMR (Mediterrâneo Oriental)
Assunto principal:
Triazinas
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Idioma:
Inglês
Revista:
Iran. J. Environ. Health Sci. Eng.
Ano de publicação:
2011
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