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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).