engleski

Adsorptive removal of malachite green from aqueous solution using lignocellulosic waste material

The ability of poplar sawdust, a lignocellulosic waste material, for the adsorption of cationic dye malachite green from aqueous solution was studied. Batch experiments were carried out at 25 °C and contact time of 300 min. The effects of the initial dye concentration (15, 25, 35 and 50 mg/dm3), adsorbent concentration (5, 10, 15 and 20 g/dm3), temperature (25 and 35 °C) and solution pH (2.5, 4.4 and 6.4) on dye removal were investigated. Adsorption efficiency (dye removal) was higher than 90% in all runs. The percentage of dye removal increased with increase in adsorbent concentration and decrease in the initial dye concentration. This was the most obvious within the first 30 min of contact time. The temperature had no significant effect on the percentage removal, while the decrease in pH caused the reduction of percentage removal of malachite green during the first 90 min of contact time. After 150 min of contact time, the difference of percentage dye removal was insignificant for all the experiments. The results demonstrated that poplar sawdust could be considered as effective, low-cost, environmentally friendly adsorbent for malachite green removal.

adsorption, malachite green, lignocellulosic waste, coloured wastewaters

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