Adsorption of Manganese(II) on Cellulose Fiber and Effect of Different States of Manganese(II) on Decomposition of Hydrogen Peroxide

The adsorption of "fresh" Mn(II) and "aged" Mn(II) on eucalyptus holocellulose was characterized under alkaline conditions. There was a good linear relationship between adsorbed Mn(II) on cellulose and free Mn(II) added. "Aged" Mn(II) showed stronger affinities to cellulose compared to "fresh" Mn(II) in the range of 0-18.18 μmol/g_cellulose Mn(II) added. Approximately 40% of free "aged" Mn(II) added was adsorbed on cellulose fiber. Adsorption of "aged" Mn(II) reached the ceiling about 7.66 μmol/g_cellulose. Moreover, the effect of different states of Mn(II) on catalytic decomposition of hydrogen peroxide, such as free "aged" Mn(II) and adsorbed "aged" Mn(II) on cellulose, was assessed. "Aged" Mn(II) adsorbed on cellulose fibre showed similar influence on peroxide decomposition compared to free "aged" Mn(II). In addition, DTPA showed a strong stability on peroxide with free "aged" Mn(II), and it was better to add alkali and hydrogen peroxide to DTPA reaction mixture solution as quickly as possible. MgSO₄ combined with DTPA was the best way to stabilize peroxide in presence of "aged" Mn(II) adsorbed on cellulose fibre, and nearly half of peroxide could remain after 40 min.