ADSORPTION OF CR (VI) FROM AQUEOUS SOLUTION USING NATURAL ADSORBENT EQUILIBRIUM AND KINETIC STUDIESP. SHANMUGHAPRABHA , G. SELVAKUMARI AND S. SASIREKAAbstract Chromium is considered as one of the 14 most noxious heavy metal. Adsorption process are being widely used by various researchers for the removal of heavy metals from wastewater and activated carbon has been frequently used as an adsorbent. In the present investigation, an attempt was made to remove chromium (VI) from aqueous solution using activated carbon prepared from may flower seed (MFSC) by adsorption techniques. Batch mode experiment was carried out at varying contact time (10 - 90 minutes), adsorbent dosage (50 - 250 mg/50 mL), metal ion concentration (2 -10 ppm) and pH (1 - 10). The optimum pH for Cr (VI) adsorption on may flower seed carbon was found to be 1. Adsorption equilibrium was obtained in 30 minutes. A dosage of 150 mg/50 mL of adsorbent was found to be effective for maximum uptake of Cr (VI). The adsorption data were fitted well with Langmuir adsorption isotherm. The kinetic models were applied to test the experimental data. The pseudo- second order equation was the best applicable model to describe the adsorption process. Desorption study was carried out using NaOH and the maximum desorption of 72.47 % was obtained in 0.3 M NaOH.
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