Abstract
Chromium (VI) is a major pollutant released during several industrial operations and if not managed properly affects the environment. The present study reports adsorption of Cr (VI) from aqueous solutions by pericarp of Pongamia pinnata (ppp), with special reference to different operating variables like pH, adsorbent dose, particle size, agitation speed of the solution, contact time and initial concentration of adsorbate. Adsorption process was found to be highly pH dependent, while the optimum pH for the adsorption of Cr (VI) was 2.0. Removal of Cr (VI) increased with the increase in metal concentration and contact time. The adsorption data have been analyzed and tested for both Langmuir and Freundlich adsorption isotherm models and the first-order kinetic rate was observed with Lagergren. The kinetics of adsorption is found to be first order with intra-particle diffusion as one of the rate determining steps. ppp is found to be effective for the removal of Cr (VI) from aqueous solutions and industrial waste waters.
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