Sorption of chromium(III) and copper(II) ions on biodamaged wood and lignin

Sorption capacity was evaluated by batch experiments: approximately equal s orption capacities of Cu(II) and Cr(III) ions were observed for wood (1.8-3 .2 mg/g and 1.5-3.2 mg/g, respectively) as well as for white and brown rot damaged wood (5.6-6.4 mg/g; 4.7-5.6 mg/g), while a higher Cu(II) ions sorpt ion capacity, as compared to the Cr(III) ions sorption, was detected for wo od digested by grub (3.0 mg/g, 1.0 mg/g), hydrolysis lignin (1.7 mg/g, 1.0 mg/g), and its modification - amino-lignin (26.4 mg/g, 11.5 mg/g). Based on water vapour sorption isothermals, it was established that metal ions sorp tion increased with the increase in the concentration of hydrophilic centre s and decreased with the energy constant detected by the BET equation. Ther efore, the material surface, chemical activity - the level of lignification of the accessible surface played an important role in the process of heavy metal sorption. The sorption of Cu(II) ions on rot damaged wood and aminol ignin was also studied by a column experiment.