هيفاء جاسم السنباوي ( أستاذ مساعد )
كلية التربية للبنات - الكيمياء
[email protected]
Thermodynamics and Kinetics of Adsorption of Eriochrome Black-T from Aqueous Media on Rice bran and on its coal
بحث النوع:
تربية التخصص العام:
هيفاء جاسم اسم الناشر:
ساجدة هادي اسماء المساعدين:
مجلة الكوفة الجهة الناشرة:
جمعة الكوفة /قسم الكيمياء/مجلة الكوفة لعلوم الكيمياء  
2010 سنة النشر:


Abstract The commercially rice bran and its coal were used for the adsorption of eriochrome black-T dye from aqueous solutions. The effect of solution pH, initial dye concentration, temperature and adsorption time on dye removal were studied using UV–Visible spectroscopy technique at ג max = 541 nm. The equilibrium time was found to be 30 minutes on each surface. The best results were achieved at pH=3 and T= 293 K. The equilibrium adsorption isotherm have been analyzed by linear Freudlich and Langmuir models. The thermodynamic parameters, ∆G ,∆H , and ∆S were calculated. The negative value of ∆H indicates that the adsorption process is exothermic. The kinetic of the adsorption on each surface was analyzed using the pseudo – first order and pseudo second order kinetic models . The adsorption of the dye on rice bran is higher than that on its coal .