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Decolorization of the aqueous Safranin O dye solution using Thuja orientalis as biosorbent | ||
| Iraqi Journal of Science | ||
| Article 1, Volume 55, Issue 3, 2014, Pages 886-898 | ||
| Author | ||
| Dunya Edan Al- Mammar | ||
| Abstract | ||
| The object of this study was to evaluate the efficiency of safranin O (SFO), dye removal with application of Thuja orientalis as a low-cost biosorbent. The biosorption equilibrium level was determined as a function of pH, adsorbent dose, contact time and temperature. Surface area and pore size distribution were measured for the adsorbent. Thuja has a good removal effeciency for SFO dye. The adsorption kinetics data were best fit for the pseudo-second order kinetic (the regression coefficient = 0.999). The experimental equilibrium adsorption data are tested for the Langmuir, freundlich,Temkin and Dubinin-Radushkevich isotherm modles. From the values of the regression coefficient the results indicate the following order to fit the isotherm Freundlich > Temkin > Dubinin-Radushkevich > Langmuir. A chemical adsorption process was indicated by the value of the mean free energy of adsorption obtained from the Dubinin-Radushkevich isotherm. Standard free energy of adsorption (∆G°) and the change in the standard enthalpy (∆H°) and the standard entropy (∆S°) were calculated to predict the nature of adsorption. | ||
| Keywords | ||
| Isotherm; kinetic; Removal; Safranin O; Thuja | ||
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