Removal of the hexavalent chromium from aqueous solution was carried out using citric acid modified Tamarind pod shell powder (Tamarindus indica L.).The modified biosorbent was characterized by Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) techniques. The effect of solution pH, biosorbent dose, initial concentration of hexavalent chromium solution, contact time, temperature and agitation rate was investigated in a systematic manner. Experimental data were analyzed by kinetic parameters such as pseudo-first order and pseudo-second order models and found that the biosorption of hexavalent chromium onto biosorbent, followed pseudo-second order kinetic model by its good correlation coefficient value which is very close to the unity. The equilibrium data were analyzed by using Langmuir and Freundlich adsorption isotherm models. Among these adsorption isotherm models Langmuir model was fitted well with its good correlation coefficient and value. The results concluded that the modified Tamarind pod shell powder (Tamarindus indica L.) was an efficient, eco-friendly, and economically low cost biodsorbent which was used in the removal of hexavalent chromium from the aqueous medium.
Tamarind pod shell powder (Tamarindus indica L.), hexavalent chromium, Batch study, Adsorption isotherms, Kinetics, Thermodynamic study
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