Adsorption isotherm studies of Zn (II) ions from aqueous solution using citric acid modified Tamarind pod shell (Tamarindus indica L.)
- Author Satish A. Bhalerao
- Co-Author Jagruti S. Vaza
- DOI
- Country : India
- Subject : Botany
Keywords : Tamarind pod shell (Tamarindus indica L.), Adsorption isotherm, Adsorption kinetics, tartaric acid
Abstract
The need to clean-up heavy metal contaminated environment cannot be over emphasized. This paper describes the adsorption isotherm studies of Zn (II) ions from aqueous solution using tartaric acid modified Tamarind pod shell (Tamarindus indica L.). Tamarind pod shell (Tamarindus indica L.) was found to be an excellent adsorbent for the removal of these metal ions. The amount of metal ions adsorbed increased as the initial concentration increased. Also, tartaric acid modification enhanced the adsorption capacity of Tamarind pod shell (Tamarindus indica L.) probably due to the chelating ability of tartaric acid. Among the four adsorption isotherm tested, Freundlich adsorption isotherm fitted well with its good correlation coefficient. Experimental data were analyzed by kinetic parameters such as pseudo-first order, pseudo-second order models, Elovich and Weber & Morris intra-particule diffusion. Results clearly indicate that pseudo-second order kinetic model by its good correlation coefficient value which is very close to the unity. Thermodynamic study revealed that the adsorption process was spontaneous, endothermic and increasing randomness of the solid solution interfaces. Tamarind pod shell (Tamarindus indica L.) used successfully for removal of chromium (VI) and zinc (II) from aqueous solutions can have been good scope in future for industrial wastewater treatment.
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