Synthesis and characterization of Ti/TiO2-Pt and Ti/TiO2/WO3 photoanodes for application in the degradation of VAT dyes by photoelectro-Fenton process

• Grant number: 11/21606-9
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Effective date (Start): April 01, 2012
• Effective date (End): March 31, 2015
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Maria Valnice Boldrin
• Grantee: Lucio César de Almeida
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated research grant: 08/10449-7 - Assessment of occurrence, toxicity/genotoxicity and degradation processes of dyes in effluents and surface water, AP.TEM

Abstract

A major challenge of the environmental concerns the development of efficient and environmentally friendly techniques for the removal of pollutants such as persistent, the vat dyes from effluents and surface waters. This project aims to explore the versatility of the technique of photoelectro-Fenton, testing a new type of reactor operating in a single compartment, where in addition to the cathode gas diffusion to be used for peroxide generation and Fe2+ regeneration, after *OH production in solution from the Fenton's reaction, would also be tested using photoanodes Ti/TiO2 of photoanodes doped with Pt or bicomponent Ti/TiO2/WO3 to the additional formation of *OH radicals on the anode surface. Therefore, this system aims to increase the efficiency of photo-Fenton process by using photoanodes irradiated with sunlight, combined with electro-Fenton process. For this, we intend to develop a highly efficient method for the degradation of industrial effluents containing dyes of the type simulated VAT; optimize the degradation process of VAT dyes, using factorial design and response surface methodology for the pilot-scale experiments; investigate the influence of the following operating parameters: temperature, electrolyte, flow rate, pH and initial concentration of Fe2+ as catalyst, kinetic studies for the degradation of selected dyes and determine/quantify the intermediate process of their mineralization, using chromatographic techniques and mass spectrometry; to propose routes of degradation of the dyes selected for the optimized conditions and to compare the efficiency of the Ti/TiO2 photoanodes doped with platinum and the bicomponents Ti/WO3/TiO2 against conventional anodes (Pt).

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

LUCIO C. ALMEIDA; MARIA V. B. ZANONI. Decoration of Ti/TiO2 nanotubes with Pt nanoparticles for enhanced UV-Vis light absorption in photoelectrocatalytic process. Journal of the Brazilian Chemical Society, v. 25, n. 3, p. 579-588, 2014-03-00. (11/21606-9)

BESSEGATO, GUILHERME G.; DE ALMEIDA, LUCIO C.; FERREIRA, SERGIO L. C.; BOLDRIN ZANONI, MARIA VALNICE. Experimental design as a tool for parameter optimization of photoelectrocatalytic degradation of a textile dye. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, v. 7, n. 4, AUG 2019. (08/10449-7, 11/21606-9, 14/50945-4, 15/18109-4, 12/18357-0, 14/03679-7)

ALMEIDA, LUCIO C.; SILVA, BIANCA F.; ZANONI, MARIA V. B.. Combined photoelectrocatalytic/electro-Fenton process using a Pt/TiO2NTs photoanode for enhanced degradation of an azo dye: A mechanistic study. Journal of Electroanalytical Chemistry, v. 734, p. 43-52, NOV 15 2014. (11/21606-9)

ALMEIDA, LUCIO C.; SILVA, BIANCA F.; ZANONI, MARIA V. B.. Photoelectrocatalytic/photoelectro-Fenton coupling system using a nanostructured photoanode for the oxidation of a textile dye: Kinetics study and oxidation pathway. Chemosphere, v. 136, p. 63-71, OCT 2015. (11/21606-9)

ALMEIDA, LUCIO C.; SILVA, BIANCA F.; ZANONI, MARIA V. B.. Combined photoelectrocatalytic/electro-Fenton process using a Pt/TiO2NTs photoanode for enhanced degradation of an azo dye: A mechanistic study. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 734, p. 10-pg., 2014-11-15. (11/21606-9)