title: Adsorption and photocatalysis of nanocrystalline TiO2 particles for Reactive Red 195 removal: effect of humic acids, anions and scavengers.
abstract: In the present study, the coupling of adsorption capacity and photocatalytic efficiency of two different industrially produced titania catalysts was investigated and compared. The azo dye Reactive Red 195 was selected as a model compound. The tested catalysts, PK-10 and PK-180, exhibited different adsorption capacities due to their significant difference in their specific surface, but both have proven to be effective photocatalysts for photodegradation of the studied dye. PK-10 exhibited strong adsorption of the studied dye due to its high specific surface area, while the second studied catalyst, PK-180, demonstrated negligible adsorption of Reactive Red 195. The effect of the pH, the concentration of the catalyst and the initial concentration of the dye appear to affect the photocatalytic rate. The effect of the presence of humic acids and inorganic ions was also examined, while the contribution of various reactive species was indirectly evaluated through the addition of various scavengers. To evaluate the extent of mineralisation of the studied dye, total organic carbon (TOC) measurements during the experiment were also conducted. Besides total colour removal, evident reduction of TOC was also achieved using both catalysts.
authors.affiliation: Department of Physical Chemistry, Palacký University, Olomouc, Czech Republic.
authors.forename: B
authors.initials: B
authors.lastname: Chládková
authors.affiliation: Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: E
authors.initials: E
authors.lastname: Evgenidou
authors.affiliation: Department of Physical Chemistry, Palacký University, Olomouc, Czech Republic.|Regional Centre of Advanced Technologies and Materials, Palacký University, Olomouc, Czech Republic.
authors.forename: L
authors.initials: L
authors.lastname: Kvítek
authors.affiliation: Department of Physical Chemistry, Palacký University, Olomouc, Czech Republic.|Regional Centre of Advanced Technologies and Materials, Palacký University, Olomouc, Czech Republic.
authors.forename: A
authors.initials: A
authors.lastname: Panáček
authors.affiliation: Department of Physical Chemistry, Palacký University, Olomouc, Czech Republic.|Regional Centre of Advanced Technologies and Materials, Palacký University, Olomouc, Czech Republic.
authors.forename: R
authors.initials: R
authors.lastname: Zbořil
authors.affiliation: Precheza a.s., Dr. Edvarda Beneše, Přerov, Czech Republic.
authors.forename: P
authors.initials: P
authors.lastname: Kovář
authors.affiliation: Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece. dlambro@chem.auth.gr.
authors.forename: D
authors.initials: D
authors.lastname: Lambropoulou
mesh_terms: D000327:Adsorption; D000838:Anions; D001391:Azo Compounds / Q000302:isolation & purification* / Q000528:radiation effects; D002384:Catalysis; D016166:Free Radical Scavengers / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D053758:Nanoparticles / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000302:isolation & purification* / Q000528:radiation effects; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D000838:Anions; D001391:Azo Compounds; D016166:Free Radical Scavengers; D006812:Humic Substances; D009282:Naphthalenesulfonates; D014874:Water Pollutants, Chemical; C545303:reactive red 195; C009495:titanium dioxide; D014025:Titanium
keywords: Azo dyes; Mineralisation; Photocatalysis; RR195; Scavengers; TiO2 nanoparticles