title: Effect of adsorption on the photocatalysis performance of anthraquinone dye.
abstract: The adsorption and photocatalytic efficiency of several TiO(2) suspended catalysts were compared to see how well they could degrade the organic pollutant anthraquinone dye Reactive Blue 2 (RB2). The adsorption of RB2 on catalysts follows the Langmuir model and adsorption capacity's influence on degradation performance has been established. Correlations between degradation kinetics and the amount of dye adsorbed (q(ads)) were then determined. The expected correlation between specific surface and q(max) was verified. The addition of sulphate ions in the case of catalysts Degussa P25 and TiO(2)-Ishihara ST01 was found to inhibit adsorption of RB2 on the TiO(2) surfaces. The hindrance of adsorption in acidic conditions improved the efficiency of the photocatalytic degradation of ST01. No adsorption was observed in alkaline pH and the photodegradation kinetic was generally higher in this condition except for that seen in photocatalysts with a low recombination rate.
authors.affiliation: Centre de Recherches et des Technologies des Eaux, Technopôle de Borj Cedria, Soliman, Tunisia.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Ismail
authors.forename: Latifa
authors.initials: L
authors.lastname: Bousselmi
mesh_terms: D000042:Absorption; D000327:Adsorption; D000880:Anthraquinones / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010777:Photochemistry; D010782:Photolysis; D013499:Surface Properties; D013816:Thermodynamics; D014025:Titanium
chemical_list: D000880:Anthraquinones; D004396:Coloring Agents; D014025:Titanium; C046804:titanium hydroxide