Adsorption Isotherms for CBY 3G-P Dye Removal from Aqueous Media Using TiO2 Degussa, Fe2O3, and TiO2/(DPC)

Shireen Abdulmohsin Azeez(1), Fadhela Muhammad Hussein(2), Rasha Wali Mohi Alsaedi(3*)

(1) Department of Chemistry, College of Science, Mustansiriyah University, Baghdad 10052, Iraq
(2) Department of Chemistry, College of Science, Mustansiriyah University, Baghdad 10052, Iraq
(3) Department of Chemistry, College of Science, Mustansiriyah University, Baghdad 10052, Iraq
(*) Corresponding Author


The adsorption of Cibacron Brilliant Yellow (CBY) 3-GP dye onto TiO2 Degussa, Fe2O3, and TiO2 anatase/Diphenylcarbizide in aqueous solution was studied with respect to temperature, contact time, and pH. The CBY 3-GP adsorption at equilibrium increased as the initial dye concentration increased for TiO2/DPC, while it decreased for TiO2 Degussa; however, it increased the initial dye concentration. The best removal efficiency was obtained at 1 mg for TiO2/DPC, TiO2 Degussa, and the amount of adsorption decreases with the rising of temperature. The negative ΔH° reveals the adsorption is exothermic and extremely negative ΔS° for TiO2 Degussa. The negative value for ΔS° indicates a regular increase of the randomness at the TiO2/DPC and Fe2O3 solution interface during adsorption. The intraparticle diffusion, pseudo-first- and second-order kinetic models were used. The Langmuir, Temkin, Freundlich, and Dubbin adsorption models were examined to describe the equilibrium isotherms. The usage of TiO2 Degussa and TiO2/DPC indicates that the equilibrium sorption was favorable.


CBY dye; adsorption models; TiO2 Degussa; Fe2O3; kinetic study; dynamic data

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