title: Evolution of natural organic matter by size exclusion chromatography during photocatalytic degradation by solvothermal-synthesized titanium dioxide.
abstract: This study shows the effect of different titanium dioxides in transforming the structural properties of natural organic matter (NOM) during photocatalytic degradation with a solar UV light simulator. Titanium dioxide (TiO(2)) synthesized by the sol-gel method coupled with the solvothermal technique and Degussa P-25 TiO(2) were used. The evolution of NOM degradation was followed by size exclusion chromatography with dissolved organic carbon, ultraviolet and fluorescence detection (SEC-DOC, SEC-UV(254) and SEC-Fl(254/450)). For both catalysts, there was a preferential degradation of the larger molecules of NOM into medium and smaller molecular size fractions. However, the synthesized TiO(2) was found to be more efficient than Degussa P-25 TiO(2) for DOC removal, especially UV(254) absorption and Fl(254/450) removal.
authors.affiliation: Grupo Procesos Fisicoquímicos Aplicados, Universidad de Antioquia, Sede de Investigación Universitaria, cra. 53 # 61-30 Medellín, Colombia. hvalens@gmail.com
authors.forename: Sergio H
authors.initials: SH
authors.lastname: Valencia
authors.forename: Juan M
authors.initials: JM
authors.lastname: Marín
authors.forename: Gloria M
authors.initials: GM
authors.lastname: Restrepo
mesh_terms: D002244:Carbon / Q000032:analysis; D002384:Catalysis; D002850:Chromatography, Gel; D003460:Crystallization; D007700:Kinetics; D010777:Photochemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013472:Sunlight; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: C009495:titanium dioxide; D002244:Carbon; D014025:Titanium