Kinetic and Thermodynamic Studies of Adsorption of Crystal Violet Dye Using a Low Cost Activated Carbon Prepared from Bauhenia racemosa Seed
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Date
2015
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Abstract
In this study the efficiency of low cost eco-friendly carbon adsorbent prepared from Bauhenia
racemosa seed (BRSC) was analysed for the removal of crystal violet (CV) dye from aqueous
solution. Kinetics and thermodynamic parameters of the adsorption of crystal violet
dye were evaluated. Adsorption kinetics is an important parameter as it provides significant
details, such as reaction pathways and mechanism of the reactions. The adsorption kinetics
of crystal violet dye onto Bauhenia racemosa seed followed Pseudo second order reaoon
model. The intraparticle diffusion study shows that the rate constant for intraparticle
diffusion (K^) increased with increase in initial concentration of crystal violet dye solution.
The results of the thermodynamic studies revealed that the adsorption of crystal violet dye
onto Bauhenia racemosa seed was spontaneous and endothermic in nature. The positive
value of entropy change showed increased randomness during adsorption.