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Journal of Environmental Science and Technology

Year: 2008 | Volume: 1 | Issue: 3 | Page No.: 111-123
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Authors

S. Gokturk

S. Kaluc

Keywords

Research Article

Removal of Selected Organic Compounds in Aqueous Solutions by Activated Carbon

S. Gokturk and S. Kaluc
The adsorption behaviour of Safranin-O (a cationic dye), phenol and nitrophenols i.e., m-nitrophenol, p-nitrophenol and o-nitrophenol was studied from aqueous solution on activated carbon under various experimental conditions. It was found that the Langmuir isotherm appears to fit the isotherm data better than the Freundlich isotherm. Dubinin-Raduskevitch (DR) isotherm was successfully used to model experimental data and modeling results showed that the uptake Safranin-O and phenols proceeded by physical adsorption. The adsorption capacity of activated carbon obtained from both Langmuir and D-R models for phenol and nitrophenols were found to be higher than for Safranin-O and following the order as: m-nitrophenol > o-nitrophenol > p-nitrophenol > phenol > Safranin-O. The kinetics of adsorption in view of three kinetic models, i.e., the first-order Lagergren model, the pseudo-second-order model and the intraparticle diffusion model was discussed. The pseudo-second-order kinetic model describes the adsorption both Safranin-O and phenols very well. The effect of temperature was also studied at the range between 293 and 323 K. Thermodynamic studies indicated that the adsorption both of Safranin-O and phenols onto activated carbon was an exothermic process. The negative values of free energy determined for these systems indicated that adsorption was spontaneous at the temperatures under investigation.
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