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Adsorption of Cu(II), Cd(II), and Pb(II) from aqueous single metal solutions by cellulose and mercerized cellulose chemically modified with succinic anhydride

Gurgel, Leandro Vinícius Alves, Júnior, Osvaldo Karnitz, Gil, Rossimiriam Pereira de Freitas, Gil, Laurent Frédéric
Bioresource technology 2008 v.99 no.8 pp. 3077-3083
Fourier transform infrared spectroscopy, adsorption, bicarbonates, cellulose, ions, mercerization, metals, models, sorption isotherms
This work describes the preparation of new chelating material from mercerized cellulose. The first part treats the chemical modification of non-mercerized cellulose (cell 1) and mercerized cellulose (cell 2) with succinic anhydride. Mass percent gains (mpg) and degree of succinylation (DS) of cell 3 (from cell 1) and cell 4 (from cell 2) were calculated. Cell 4 in relation to cell 3 exhibited an increase in mpg and in the concentration of carboxylic functions of 68.9% and 2.8mmol/g, respectively. Cells 5 and 6 were obtained by treatment of cells 3 and 4 with bicarbonate solution to release the carboxylate functions and characterized by FTIR. The second part compares the adsorption capacity of cells 5 and 6 for Cu²⁺, Cd²⁺, and Pb²⁺ ions in an aqueous single metal solution. Adsorption isotherms were developed using Langmuir model. Cell 6 in relation to cell 5 exhibited an increase in Q max for Cu²⁺ (30.4mg/g), Cd²⁺ (86.0mg/g) and Pb²⁺ (205.9mg/g).