title: Lack of enhanced photocatalytic formation of iodine on particulate semiconductor mixtures.
abstract: Under UV-A light illumination, formation of iodine from iodide ion on the surfaces of anatase TiO(2), ZnO, Fe(2)O(3), CeO(2), MoO(3), Bi(2)O(3), and Nb(2)O(5) increases with the concentration of iodide ion, airflow rate and light intensity and conform to the Langmuir-Hinshelwood kinetic model. Measurement of the particle size of the semiconductor oxides by light scattering method and deduction of the same from the determined specific surface area show that the oxide particles agglomerate in suspension. However, mixtures of any two listed particulate semiconductors do not show enhanced photocatalytic formation of iodine indicating absence of interparticle charge transfer. The results are rationalized.
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India. karunakaranc@rediffmail.com
authors.forename: C
authors.initials: C
authors.lastname: Karunakaran
authors.forename: P
authors.initials: P
authors.lastname: Anilkumar
authors.forename: P
authors.initials: P
authors.lastname: Vinayagamoorthy
mesh_terms: D002384:Catalysis; D007454:Iodides / Q000737:chemistry*; D007455:Iodine / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D012666:Semiconductors; D014466:Ultraviolet Rays
chemical_list: D007454:Iodides; D010087:Oxides; D007455:Iodine