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- Title
Impact of TiO2-Cation Exchange Resin Composite on the Removal of Ethyl Violet.
- Authors
Agueniou, Fazia; Chebli, Derradji; Reffas, Abdelbaki; Bouguettoucha, Abdallah; Benguerba, Yacine; Favier, Lidia; Amrane, Abdeltif
- Abstract
Adsorption capacity and photocatalytic performance of a mixture of TiO2<inline-graphic></inline-graphic> and a cation exchange resin were assessed by measuring the removal of the cationic dye ethyl violet (EV) from water. Highest adsorption of EV was achieved at pH 3 due to the increase in number of positive charges of the EV molecule. However, adsorption decreased at higher pH. The adsorption kinetics at pH 3 could be accurately described by means of a pseudo-second order kinetic model. Experimental adsorption equilibrium data at pH 3 fitted the Langmuir model more accurately than the Sips and Freundlich models. Photocatalysis experiments indicated that the EV elimination was higher with the mixture of cation exchange resin and TiO2<inline-graphic></inline-graphic> than with pure TiO2<inline-graphic></inline-graphic>. The description of experimental photocatalysis data by means of the Langmuir-Hinshelwood model was improved by introducing a power parameter in the original model. From the modified Langmuir-Hinshelwood model, it could be derived that the addition of increasing resin concentrations to a constant TiO2<inline-graphic></inline-graphic> concentration enhanced the photocatalytic rate constant; however, UV light penetration in the solution was impeded beyond a given resin amount. Pseudo-first-order kinetics showed poor fit of experimental photocatalysis data except for low EV concentration (<35<inline-graphic></inline-graphic> mg/L) at high resin dosage. A synergistic effect between adsorption and photocatalysis was seen upon combining the TiO2<inline-graphic></inline-graphic>. This composite was more efficient for the removal of the dye than the use of TiO2<inline-graphic></inline-graphic> alone.
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2018, Vol 43, Issue 5, p2451
- ISSN
2193-567X
- Publication type
Academic Journal
- DOI
10.1007/s13369-017-2857-8