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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.18 [2011] >
IJCT Vol.18(1) [January 2011] >
| Title: | A comparative evaluation for adsorption of dye on Neem bark and Mango bark powder |
| Authors: | Srivastava, Ruchi
Rupainwar, D C |
| Keywords: | Adsorption
Adsorption isotherm
Bark powders
dyes
Batch mode |
| Issue Date: | Jan-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The
use of low cost adsorbent has been investigated as a replacement for the
current expensive methods of removing dyes from wastewater. As such, Neem bark
and Mango bark generated as a wood waste is collected and converted into a
powder form and then used as a low-cost adsorbent for removal of dyes from
wastewater. Adsorption studies are carried out at different temperatures, pH,
initial dye concentrations and adsorbent doses. The adsorption of malachite
green (dye) is found to increase with increase in temperature. The linear form
of Langmuir and Freundlich models fitted the adsorption data. The results
indicated that Langmuir adsorption isotherm fitted the data better than
Freundlich isotherm. Thermodynamic parameters such as the free energies,
enthalpy and entropy of adsorption of the dye-Mango bark, Neem bark powder
systems are also evaluated. The negative values of free energy indicated the
feasibility and spontaneous nature of the process, and the positive heats of
enthalpy suggest the endothermic nature of the process. The adsorption of
Malachite green follow the second-order kinetics in both the adsorbents. |
| Page(s): | 67-75 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.18(1) [January 2011]
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