CR(III) REMOVAL FROM AQUEOUS-SOLUTIONS BY DEPECTINATED SUGAR-BEET PULP

We report a study of the removal of Cr(III) from aqueous solutions by depectinated sugar beet pulp (DSBP) carried out at different initial c oncentration of Cr(III), pH and temperature of solution, particle size and adsorbent dosage. Removal percentage of Cr(III) was found to be 8 6 for inital concentration of 10 mg L-1 at 20 degrees C and 20 g L-1 a dsorbent dosage. The optimum pH for the process was found to be 4.5. T he process of uptake follows first-order adsorption rate expression an d obeys Langmuir and Freundlich's adsorption models. Enthalpy change o f adsorption was found to be 27.3 kJ mol(-1). Little fraction of Cr(II I) was desorbed in strong acidic media.