Kinetic and mechanistic overview of TiO2-photocatalyzed oxidation reactions in aqueous solution

• Published in: Solar energy materials Vol. 24; no. 1-4; pp. 584 - 593
• Main Authors: Blake, Daniel M., Webb, John, Turchi, Craig, Magrini, Kimberly
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier 01.12.1991; North-Holland
• Subjects: 140505 - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-); 400500 - Photochemistry; ACID CARBONATES; CATALYTIC EFFECTS; CHALCOGENIDES; CHEMICAL REACTION KINETICS; CHEMICAL REACTIONS; Chemistry; CONVERSION; DECOMPOSITION; ENERGY CONVERSION; Exact sciences and technology; General and physical chemistry; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; KINETICS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; Photochemistry; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); REACTION KINETICS; SOLAR ENERGY; SOLAR ENERGY CONVERSION; SOLAR THERMAL CONVERSION; TITANIUM COMPOUNDS; TITANIUM OXIDES; TRANSITION ELEMENT COMPOUNDS; Titanium IV Oxides; Semiconductor materials; Mother; Transition metal Compounds; Photocatalysis; Oxidation; Solar radiation; Free radical reaction; Organic compounds
• ISSN: 0165-1633
• DOI: 10.1016/0165-1633(91)90092-Y

Destruction of trace organic compounds in water by photocatalytic oxidation over titanium dioxide is the subject of worldwide interest. In this paper we review chemical mechanisms and identify some band gap and thermodynamic limitations that must be considered in limiting a solar-driven process. Recent work will be discussed which tests predictions made by the mechanism concerning dependence of rates of destruction on light flux and on the presence of bicarbonate ion, a known hydroxyl radical scavenger.