title: Degradation of Orange II by Fenton reaction using ilmenite as catalyst.
abstract: This work deals with the degradation of the azo-dye Orange II (OII) by a heterogeneous process with dark Fenton. Natural and purified ilmenites from Colombian soil were used as catalysts. The catalysts have different physicochemical properties and are basically composed of TiO2and Fe2O3. Ilmenites (FeTiO3), raw materials highly available at low cost, were studied by means of conventional metallography (polished grain mounts), as well as BET, XRD, and XRF in order to determine their possible source area and the factors that influence their use as a catalyst for OII degradation. The pH, the ilmenite amount, the initial CH2O2, and the temperature of the reaction system were studied. Complete degradation of dye was observed within 7 h, while 90 % of OII was removed in 7 h using Cumaribo Ilmenite. Graphical Abstract ᅟ.
authors: Facultad de Ciencias Naturales e Ingeniería, Departamento de Ingeniería, Universidad Jorge Tadeo Lozano, Carrera 4 No 22-61, Bogotá, DC, Colombia. alisy.pataquivam@utadeo.edu.co.
authors: A Y
authors: AY
authors: Pataquiva-Mateus
authors: Facultad de Ingeniería, Departamento de Ingeniería Química y Ambiental, Universidad Nacional de Colombia, Carrera 30 No 45-03, Bogotá, DC, Colombia.
authors: H R
authors: HR
authors: Zea
authors: Facultad de Ingeniería, Departamento de Ingeniería Química y Ambiental, Universidad Nacional de Colombia, Carrera 30 No 45-03, Bogotá, DC, Colombia.
authors: J H
authors: JH
authors: Ramirez
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; C029232:ilmenite; D006861:Hydrogen Peroxide; D014025:Titanium; D007501:Iron; C014722:2-naphthol orange
keywords: Acid orange 7 (Orange II); Colombian ilmenite; Fotofenton reaction; Geocatalyst; Total organic carbon