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Paper Details

Kinetic and Thermodynamic Study of Adsorption of Crystal Violet on Biosorbents from Wastewater

Satish Patila, Sameer Renukdasb and Naseema Patelb*

Journal Title:Journal of Chemical, Biological and physical sciences

The capacity and mechanism of different agricultural residues as biosorbents in removing crystal violet (CV) from aqueous solutions was investigated with variation in parameters such as initial dye concentration, adsorbent dose, pH, agitation time, agitation speed, particle size of adsorbent and temperature. Freundlich, Langmuir and Temkin isotherm models were found to be best fitting with linear regression coefficient R2 ? 0.999. The monolayer (maximum) coverage capacities (qm) were also high between 333.333 and 500 mg/g. Lagergen pseudo -second order model best fits the kinetics of adsorption. It was observed that chemisorptions pseudo-second order kinetic model described the sorption process with high coefficients of determination (R2 ? 0.999) better than any other kinetic models. Intra particle diffusion plot showed boundary layer effect and larger intercepts indicates greater contribution of surface sorption in rate determining step. Adsorption was found to increase on increasing pH, increasing temperature, increasing agitation speed and decreasing particle size. Thermodynamics showed that the adsorption of CV on biosorbents was favourable and spontaneous, endothermic physical adsorption and increased disorder and randomness at the solid- solution interface of CV with biosorbents