title: Fenton's reagent-mediated degradation of residual Kraft black liquor.
abstract: In this work, the effect of Fenton's reagent on the degradation of residual Kraft black liquor was investigated. The effect of Fenton's reagent on the black liquor degradation was dependent on the concentration of H2O2. At low concentrations (5 and 15 mM) of H2O2, Fenton's reagent caused the degradation of phenolic groups (6.8 and 44.8%, respectively), the reduction of reaction medium pH (18.2%), and the polymerization of black liquor lignin. At a high concentration (60 mM) of H2O2, Fenton's reagent induced an extensive degradation of lignin (95-100%) and discoloration of the black liquor. In the presence of traces of iron, the addition of H2O2 alone induced mainly lignin fragmentation. In conclusion, Fenton's reagent and H2O2 alone can degrade residual Kraft black liquor under acidic conditions at room temperature.
authors: Departamento de Bioquímica, Facultad de Medicina, Universidad de Los Andes, Mérida, Venezuela.
authors: Elisa
authors: E
authors: Araujo
authors: Antonio J
authors: AJ
authors: Rodríguez-Malave
authors: Aura M
authors: AM
authors: González
authors: Orlando J
authors: OJ
authors: Rojas
authors: Nancy
authors: N
authors: Peñaloza
authors: Johnny
authors: J
authors: Bullón
authors: Mayra A
authors: MA
authors: Lara
authors: Natalia
authors: N
authors: Dmitrieva
mesh_terms: D001709:Biotechnology; D002845:Chromatography; D006861:Hydrogen Peroxide / Q000378:metabolism / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007501:Iron / Q000494:pharmacology*; D008031:Lignin / Q000737:chemistry* / Q000378:metabolism; D008353:Mannitol / Q000494:pharmacology; D008970:Molecular Weight; D019800:Phenol / Q000737:chemistry; D013053:Spectrophotometry; D013696:Temperature; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: C045076:Fenton's reagent; D007477:Ions; D019800:Phenol; D008353:Mannitol; C076151:Kraft lignin; D008031:Lignin; D006861:Hydrogen Peroxide; D007501:Iron