Kinetics and Thermodynamic of Cr(Ⅵ)onto modified.coconut shell
A batch adsorption study was carried out to investigate the properties,kinetics and thermodynamics of adsorption process of Cr(Ⅵ)on coconut shell.The results showed that in the first 3 hours the reaction of adsorption by coconut shell was fast.The adsorption followed pseudo-second-order kinetics.The intraparticle transport of Cr(Ⅵ)showed that intra-particle diffuse was exit at the whole adsorption process,but it was not the major rate-limiting step for coconut.The adsorption studies revealed that the adsorption validated Freundlich adsorption.So this adsorption process was a multi-molecular layer adsorption.The negative values of ? 0G indicated that adsorption process was spontaneous in nature.Positive? 0H values indicated the adsorption process to be endothermic.
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