Adsorptive Removal of Six Dyes from Aqueous Solution using Normal and Modified Sawdust of Gmelina arborea Roxb

Author(s): Kruti Vyas and Darshan Dharajiya*

Abstract: In the present study, the use of low-cost timber industry waste adsorbent normal sawdust of Gmelina arborea (NSGA) and alkali modified sawdust of Gmelina arborea (MSGA) have been reported as an alternative to the existing expensive methods of removing dyes from aqueous solution. Total six dyes viz., Malachite Green, Congo Red, Crystal Violet, Methylene Blue, Bromophenol Blue and Methyl Orange were removed from aqueous solution using NSGA and MSGA. Alkali and heat treatments were used to modify the sawdust to alter its adsorptive capacity. The NSGA removed 95.22 % crystal violet from the aqueous which was maximum removal by NSGA. The MSGA removed 91.6% malachite green which was highest among the six dyes used in the screening. The results indicated that most of the dyes were removed within 20-40 minutes. The efficacy of dye adsorption was improved in case of bromophenol blue, Congo red, methylene blue and malachite green after alkali and heat treatment to sawdust of Gmelina arborea. The result indicates that after optimization alkali modified Gmelina arborea sawdust can be used for the adsorptive removal of dyes from wastewater.

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