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Research paper thumbnail of Colour Removal from Synthetic Dye Wastewater Using a Bioadsorbent

Water Air and Soil Pollution, 2000

Removal of dyes (Crystal Violet, Methylene Blue, Malachite Greenand Rhodamine B) from aqueous sol... more Removal of dyes (Crystal Violet, Methylene Blue, Malachite Greenand Rhodamine B) from aqueous solutions at differentconcentrations, pH and temperatures by Neem sawdust has beencarried out successfully. The percentage of the dye adsorbed byNeem sawdust decreased from 91.56 to 78.94 and 84.93 to 71.25 for Crystal Violet and Malachite Green, respectively, when the concentration of the dye was increased from 6 to 12 mg L-1 at atemperature 30 ± 1 °C and pH 7.2. Adsorption ofother dyes (Methylene Blue and Rhodamine B) also decreased withincreasing concentration of the dye in solutions. The values ofthe rate constant of adsorption (k ad) of Crystal Violet at25, 35 and 45 °C were found to be 10.80, 10.52 and 10.25 × 10-2 min-1, respectively. The values of the Langmuir constant for adsorption capacity (Q o) of Crystal Violet on the adsorbent varied from 4.44 to3.99 mg g-1, respectively, with the increase of temperaturebetween 25 to 45 °C. The equilibrium data followed theLangmuir model of adsorption. The variation in the extent ofremoval with pH has been explained on the basis of surfaceionisation and complexation. Thermodynamic parameters(ΔG, ΔH and ΔS) have also been determinedto explain the results.

Research paper thumbnail of Colour Removal from Synthetic Dye Wastewater Using a Bioadsorbent

Water Air and Soil Pollution, 2000

Removal of dyes (Crystal Violet, Methylene Blue, Malachite Greenand Rhodamine B) from aqueous sol... more Removal of dyes (Crystal Violet, Methylene Blue, Malachite Greenand Rhodamine B) from aqueous solutions at differentconcentrations, pH and temperatures by Neem sawdust has beencarried out successfully. The percentage of the dye adsorbed byNeem sawdust decreased from 91.56 to 78.94 and 84.93 to 71.25 for Crystal Violet and Malachite Green, respectively, when the concentration of the dye was increased from 6 to 12 mg L-1 at atemperature 30 ± 1 °C and pH 7.2. Adsorption ofother dyes (Methylene Blue and Rhodamine B) also decreased withincreasing concentration of the dye in solutions. The values ofthe rate constant of adsorption (k ad) of Crystal Violet at25, 35 and 45 °C were found to be 10.80, 10.52 and 10.25 × 10-2 min-1, respectively. The values of the Langmuir constant for adsorption capacity (Q o) of Crystal Violet on the adsorbent varied from 4.44 to3.99 mg g-1, respectively, with the increase of temperaturebetween 25 to 45 °C. The equilibrium data followed theLangmuir model of adsorption. The variation in the extent ofremoval with pH has been explained on the basis of surfaceionisation and complexation. Thermodynamic parameters(ΔG, ΔH and ΔS) have also been determinedto explain the results.

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