Removal of metal ions from aqueous solution on low cost natural polysaccharides: Sorption mechanism approach

✍ Scribed by Claire Gérente; Pierre Couespel du Mesnil; Yves Andrès; Jean-François Thibault; Pierre Le Cloirec

• Book ID: 104424996
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 171 KB
• Volume: 46
• Category: Article
• ISSN: 1381-5148
• DOI: 10.1016/s1381-5148(00)00047-x

✦ Synopsis

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The fixation of Cu , Ni and Pb on sugar beet pulp, a low-cost material, has been studied. After a simple treatment of the sorbent, the results have shown that the mode of fixation depends on the metal. The key part of the mode of fixation is attributed to ion exchange, while a non-negligible part of adsorption could sometimes occur. As far as lead ions are concerned, 25% of their fixation capacities are due to adsorption mechanism at pH 4. The overall uptake is at a maximum at

pH 6 and gives up to 60 mg g for Pb , 30 mg g for Cu and 12 mg g for Ni , which seems to be removed exclusively by ion exchange. These capacities increase with the pH. Diffusion models have been tested on samples of different particle size, and they have suggested a transfer to the intraparticular sites.