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Kinetic Study for Adsorption of Chromium tri-Oxide on Kaolinite Surface | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 31, 2014, Pages 415-427 | ||
| Authors | ||
| Khawlaa Gani; Ayad F. Al-Kaim; Aseal M. Kadhum; Aseal F | ||
| Abstract | ||
| Abstract The removal of by using kaolinite have been investigated, as a function of initial concentration, pH and temperatures. Adsorption process, was attained to equilibrium within 60 minutes which indicated by uv-visible absorption spectroscopy technique at wave length 390 nm. The best results which are used in this study were achieved at pH of 4, and 290 K, in this range of pH and temperature, the chromium tri oxide transformation hydro-chromate into bi-chromate takes place. The equilibrium data for adsorption are fitted to the Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherm equations. Values of parameters for theses isotherms equations were calculated. The mean energy of adsorption Eads, was also calculated from the adsorption energy constant Keng, its value determined from the D-R isotherm equation. The temperature thermodynamic parameters like , and have been calculated. Values of enthalpy showed that the adsorption process is exothermic | ||
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