Kinetic Study of Adsorption Processes of Some Azo Dyes on Activated Carbon | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 12, Issue 1, December 2007, Pages 48-54 | ||
| Author | ||
| Emad A.S. Al-Hyali | ||
| Abstract | ||
| The adsorption of a number of azo dyes on activated carbon have been studied. Factors affecting adsorption such as time, concentration, pH and temperature variation have been investigated. The equilibrium constants are calculated from the ratio between the adsorbed and unbound concentration at different temperatures. The enthalpy of adsorption (H) is estimated. The kinetic of adsorption and desorption processes of the studied dyes have been conducted by using the integrated rate equation of the reversible first order reaction. The rate constants of both were determined at various temperatures. The activation energies and thermodynamic parameters of activation of the forward and backward are calculated. The values of the (H) revealed that, the adsorption process for all the studied dyes are exothermic and the forces control the adsorption are physical in nature. The values of activation energies indicated that, the process occurs in favor of the adsorption direction. The activation energies and other parameters of activation are in good agreement with the thermodynamically calculated | ||
| Keywords | ||
| azo dyes; activated carbon; Thermodynamic function; Kinetic study; Activation energy | ||
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