Benner
أ .د سعد عزيز حسـوة ( أستاذ )
كلية التربية للبنات - الكيمياء
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The performance of Cement Kiln Dust in Removal of SomeDyes from Aqueous Solutions
تحميل
بحث النوع:
علوم التخصص العام:
D.A. Kadhim اسم الناشر:
S.A. Hassan اسماء المساعدين:
الجهة الناشرة:
ISSN: 2249-3387  
2016 سنة النشر:

الخلاصة

ABSTRACT The adsorption of Murexide, Eosin yellowish and Bromo cresol green(BCG) dyes by CKD wascarried out by varying the parameters such as contact time, dye concentration, adsorbent dose, pHand temperature. Adsorption isotherm equations were tested for all of Langmuir, Freundlich, Temkin, Modified Frumkin, Dobinin-Radushvich, Harkins-Jura and Elovich. The equilibriumadsorption data were fitted between Freundlich and Temkin isotherms for Murexide, D-R isothermfor Eosin yellowish and Freundlich for BCG. Adsorption followed pseudo-second-order ratekinetics. The high percentage removal was found ≈ 80.2% at 333K , pH 6 ; ≈ 42% at 303K, pH6; and ≈ 50% at 303K, pH 5 of Murexide, Eosin yellowish and BCG respectively. Thermodynamicparameters ΔG, ΔH, ΔS and Ea were computed ,and showed that the adsorption process onto CKD was endothermic and spontaneous in Murexide adsorption process, while in Eosin yellowishand BCG adsorption was exothermic and spontaneous. Also adsorption studies suggest thatphysisorption might be the major mode of adsorption and CKD expressed as low affinity forremoval of Eosin yellowish and BCG and in general the adsorption process was less affected by temperature