Abstract

The adsorption of chromium (III) ion from aqueous solution by rice hull ash at equilibrium was investigated. The adsorption data was found to follow both the Freundlich and Langmuir models. Thermodynamic parameters for the adsorption process, that is, K C, Δ G, Δ H and Δ S have also been calculated. The positive value of Δ S and negative values of Δ G displayed the spontaneous nature of this adsorption system, while the positive value of Δ H pointed out this is an endothermic process.

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