title: Microcystin-LR degradation by solar photo-Fenton, UV-A/photo-Fenton and UV-C/H2O2: a comparative study.
abstract: This work assessed the effectiveness of several methods on degradation of microcystin-LR (MC-LR) by different Advanced Oxidation Processes, like solar photo-Fenton, UV-A/photo-Fenton and UV-C/H2O2. UV-C/H2O2 and UV-A/photo-Fenton processes were carried out in a bench scale photochemical apparatus and the solar photo-Fenton treatment was performed in a CPC photoreactor. MC-LR degradation was monitored by LC-ESI-MS/MS and kinetic parameters were calculated for all systems evaluated. The results demonstrated that UV-C/H2O2 was the most efficient method, showing a reduction of over 90% of initial MC-LR after 5 min of reaction. Solar and photo-Fenton/UVA had a rate decrease of 88 and 76% after the same time, respectively. The kinetic study indicated that the solar photo-Fenton and artificial radiation (UV-A) processes were very similar in their efficiency. The use of sunlight instead of artificial UV radiation significantly reduced the cost of photocatalytic treatment systems; it is also an environmentally friendly method, since it utilizes renewable energy.
authors.affiliation: Department of Chemistry and Biology, Federal Technological University of Paraná-UTFPR, Curitiba, PR, Brazil.
authors.forename: Adriane M
authors.initials: AM
authors.lastname: de Freitas
authors.forename: Carla
authors.initials: C
authors.lastname: Sirtori
authors.forename: Cesar A
authors.initials: CA
authors.lastname: Lenz
authors.forename: Patricio G
authors.initials: PG
authors.lastname: Peralta Zamora
mesh_terms: D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008387:Marine Toxins; D052998:Microcystins / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D021241:Spectrometry, Mass, Electrospray Ionization; D014466:Ultraviolet Rays
chemical_list: C045076:Fenton's reagent; D008387:Marine Toxins; D052998:Microcystins; D006861:Hydrogen Peroxide; D007501:Iron; C057862:cyanoginosin LR