Mechanisms of Cr(III) and Cr(VI) removal from aqueous solutions by sugar beet pulp.
The removal of three- and hexavalent chromium from aqueous solutions using sugar beet pulp as biosorbent substratewas performed. The kinetics of Cr(III) and Cr(VI) removal were studied at 20.0 +/- 0.5 degrees C and under various experimental conditions. The Cr(III) ions were adsorbed onto the biosorbent by ion-exchange mechanism with Ca2+ cations. The influence of solution pH was found to greatly affect the adsorption efficiency of Cr(VI). Cr(VI) removal was largely involved in a reduction mechanism with the appearance of Cr(III) ions in the solution.
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Ecole des Mines de Nantes, GEPEA, 4 rue Alfred Kastler, BP 20722, 44307 Nantes 3, France.
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Andres
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Le Cloirec
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D027461:Beta vulgaris; D001673:Biodegradation, Environmental; D002274:Carcinogens, Environmental / Q000302:isolation & purification*; D002857:Chromium / Q000302:isolation & purification*; D007474:Ion Exchange; D010084:Oxidation-Reduction; D018508:Water Purification / Q000379:methods*
D002274:Carcinogens, Environmental; D002857:Chromium; C074702:chromium hexavalent ion