title: Degradation and toxicity depletion of RB19 anthraquinone dye in water by ozone-based technologies.
abstract: This research investigated the discoloration and mineralization of Reactive Blue 19 (RB19) anthraquinone dye by single ozonation, single UV radiation and ozonation jointed with UV radiation (O3/UV). The problem was approached from two points of view: with the objective of color removal or the mineralization of solution. In each case, the optimum operating conditions were different. Ozonation was the most effective treatment for color removal, while the combined O3/UV treatment was for mineralization. Major intermediates of the dye degradation were identified by gas chromatography/mass spectrometry and a degradation pathway was proposed. In addition, a clear decrease of the toxicity of the dye was achieved at the end of the experiments. The effect of initial dye concentration, pH, ozone dose, and UV radiation on the degradation of the dye and decrease of total organic carbon was investigated, in order to establish the optimal operating conditions to achieve discoloration, mineralization or a combination of both.
authors.affiliation: Instituto de Desarrollo Tecnológico para la Industria Química (U.N.L. - CONICET), Güemes 3450 (3000), Santa Fe, Argentina E-mail: mlovato@santafe-conicet.gov.ar.
authors.forename: María E
authors.initials: ME
authors.lastname: Lovato
authors.affiliation: Instituto de Desarrollo Tecnológico para la Industria Química (U.N.L. - CONICET), Güemes 3450 (3000), Santa Fe, Argentina E-mail: mlovato@santafe-conicet.gov.ar.
authors.forename: María L
authors.initials: ML
authors.lastname: Fiasconaro
authors.affiliation: Instituto de Desarrollo Tecnológico para la Industria Química (U.N.L. - CONICET), Güemes 3450 (3000), Santa Fe, Argentina E-mail: mlovato@santafe-conicet.gov.ar.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Martín
mesh_terms: D048908:Aliivibrio fischeri / Q000187:drug effects; D000880:Anthraquinones / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects / Q000633:toxicity; D004396:Coloring Agents / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects / Q000633:toxicity; D008401:Gas Chromatography-Mass Spectrometry; D010126:Ozone / Q000737:chemistry*; D012996:Solutions; D018675:Toxicity Tests; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects / Q000633:toxicity; D018508:Water Purification / Q000379:methods*
chemical_list: D000880:Anthraquinones; D004396:Coloring Agents; D012996:Solutions; D014874:Water Pollutants, Chemical; D010126:Ozone; C024758:Remazol Brilliant Blue R