ADSORPTION OF Cr(VI) IONS BY GREEN INORGANIC SORBENT: KINETIC STUDY
Keywords:
clayey diatomite, Cr(VI), adsorption, kineticsAbstract
Among the various heavy metals that appear as the most toxic pollutant of wastewater, chromium is included. The toxic effect of chromium is correlated with its valence. Hexavalent chromium Cr(VI), is toxic to all forms of life and is considered a major pollutant. The focus of this paper is the removal of Cr(VI) ions from real systems using natural mineral raw materials as adsorbent and studying the adsorption kinetics of these systems.These investigations were performed in a batch glass reactor with a working volume of 2l, at room temperature and a constant stirring speed of 400 rpm using a magnetic stirrer, while the equilibrium and kinetics of the studied process were monitored. In order to define the kinetics of the investigated trepel - Cr(VI) system, the following models were applied: pseudo II order model and the Elovic model. It was found that the best results in terms of describing the kinetics of the adsorption process are given by the pseudo-II order model for a reversible reaction, where the correlation coefficients (R2) range from 0.99 to 1.
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