EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDIES ON ADSORPTION OF REACTIVE DYES ONTO ACTIVATED GUAVA LEAF POWDER

作者：Patel Himanshu^*; Vashi R T

来源：Fresenius Environmental Bulletin, 2011, 20(3): 561-568.

• Activated guava leaf powder
• Reactive dyes
• Adsorption equilibrium isotherms
• Kinetic models
• Thermodynamic study

Due to excessive consumption of reactive dyes, textile industrial wastewater having high quantity of these contaminants causes pollution problems. Adsorption is an efficient method for removal of dyes and other contaminations using natural adsorbent as well as activated carbon materials. In this investigation, the removal of Reactive Black 5 and Reactive Green 12 has performed by adsorption method using activated guava leaf powder from dye concentrations of 50 gm/L prepared in deionized water. The equilibrium isotherm and kinetic model were studied by altering different process parameters like adsorbent dosage and contact duration, respectively. Freundlich, Langmuir, Redlich-Peterson, Dubinin-Raduskevich and Temkin isotherms were utilized to describe the equilibrium characteristics of adsorption. The data were analyzed using kinetic models viz, pseudo first- and second-order, intra-particle and Elovich equations. Among all, Freundlich and pseudo isotherm second-order equation were best fitted with the resulting data. The thermodynamic parameters, such as free energy of adsorption (Delta G degrees) enthalpy change (Delta H degrees) and entropy change (Delta S degrees) were also determined and evaluated by varying temperature of a system.

• 出版日期2011