KINETICS AND PROCESS DESIGN FOR ADSORPTION OF MAXILON RED DYE FROM AQUEOUS SOLUTIONS USING GAS MIXING | ||||
| The International Conference on Chemical and Environmental Engineering | ||||
| Article 1, Volume 6, 6th International Conference on Chemical & Environmental Engineering, May 2012, Page 1-13 PDF (250.68 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/iccee.2012.35794 | ||||
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| Authors | ||||
| Mamdouh Mahmoud Nassar1; Taha Ebrahiem Farrag2 | ||||
| 1Chemical Engineering Department, Faculty of Engineering, El-Minia University, El-Minia, Egypt. | ||||
| 2Chemical Engineering Department, Faculty of Engineering, El-Minia University, El-Minia, Egypt, Corresponding author: Fax +2086-2346674. | ||||
| Abstract | ||||
| Abstract The gas mixing technique was used to study the kinetics of adsorption of a dye from its solution. Equilibrium and kinetic studies were investigated for the adsorption of Maxilon Red BL-3 onto a low cost adsorbent (natural clay). Linear regression was used to determine the best fit of equilibrium and kinetics expressions. The two parameters models including Freundlich, Temkin, Dubinin-Radushkevich and four different linearized forms of Langmuir were employed for fitting the equilibrium data. Type I of Langmuir model was found to be the best model that represents experimental data and the monolayer adsorption capacity was determined as 344.83 mg/g at 25ºC. Factors influencing dye adsorption such as gas flow rate, initial dye concentration and temperature were investigated. Four kinetic models, pseudo first-order, pseudo second-order, Elovich and fractional power kinetic models were selected to follow the adsorption process. A comparison of the kinetic models on the overall adsorption rate showed that the adsorption system using gas mixing was best described by pseudo second-order kinetics. Based on the sorption isotherm relations obtained a single stage batch adsorber was designed for different initial dye concentrations to calculate the optimum effluent volume based on dye concentration/adsorbent mass ratio. | ||||
| Keywords | ||||
| Gas mixing; equilibrium; kinetic models; Natural clay; Batch adsorber | ||||
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