Study of the degradation of the textile Reactives Dyes Blue 19 and Black 5 via H2O2 electrogenerated and electro-fenton (H2O2 electrogenerated/fenton) and via direct electrooxidation in electrodes of TI/BDD

• Grant number: 11/15811-9
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: November 01, 2011
• End date: July 30, 2015
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal Investigator: Marcos Roberto de Vasconcelos Lanza
• Grantee: Vanessa Moura Vasconcelos
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated scholarship(s): 14/12661-4 - Study of electrochemical oxidation of textile dyes reactives blue 19 and black 5 using boron-doped diamond electrodes in a filter-press flow reactor, BE.EP.DD

Abstract

The pollution of water resources has been one of the major problems of modern society, since water is essential for the life of all species. The excessive population growth together with increased industrial activity corroborate this environmental problem. The textile industry has a special feature, because it generates large volumes of wastewater that are highly colored due to the presence of dyes that do not remain on the fiber during the dyeing process. These textile effluents when not properly treated, can cause visual pollution, changes in biological cycles affecting mainly the processes of photosynthesis, furthermore, studies have shown that some classes of dyes, especially azo-dye, and byproducts, can be carcinogenic and/or mutagenic. In general terms, the wastewater containing organic compounds can be treated by oxidation chemical, biological digestion or thermal incineration, however, most commercially used dyes are resistant the biodegradation, photodegradation and the oxidizing agents, so it is necessary the development of appropriate technologies for water treatment and wastewater to be able to destroy or immobilize toxic compounds more effectively and economically as possible. The electrochemical technology offers efficient and versatile means to control water pollution through redox reactions, through direct reactions between the pollutants species and the electrode surface or the synergism of these processes with the power of oxidizing species generated in situ. In this context, the aim of this work is to study the processes of degradation of reactive dyes Reactive Blue 19 (RB-19) and Reactive Black 5 via electrogeneration cathodic hydrogen peroxide (H2O2), electro-fenton (H2O2 electrogenerated/Fe (II)), H2O2 electrogenerated/O3/UV and conjugates processes, furthermore, to the direct electrochemical oxidation using type electrodes DSA and TI/DDB. The efficiency of the processes of degradation of the reactive dyes will be evaluated by removing the coloration, the concentration decays, by the formation of inorganic ions and reducing of the total organic carbon content depending on the electrode material, current and/or applied potential, as well as the efficiency of in situ generation of H2O2. With the development of this project is hoped to obtain the best experimental results of degradation of dyes, combined with lower treatment costs, safe operation and total mineralization of the pollutant. (AU)

Scientific publications

(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)

VASCONCELOS, VANESSA M.; PONCE-DE-LEON, CARLOS; ROSIWAL, STEFAN M.; LANZA, V, MARCOS R.. Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron-Doped Diamond and Reticulated Vitreous Carbon Electrodes. CHEMELECTROCHEM, v. 6, n. 13, p. 3516-3524, JUL 1 2019. (11/15811-9, 14/12661-4)

VANESSA M. VASCONCELOS; FERNANDA DE L. SOUZA; THAIS T. GUARALDO; FERNANDA L. MIGLIORINI; MAURÍCIO R. BALDAN; NEIDENÊI G. FERREIRA; MARCOS R. DE V. LANZA. OXIDAÇÃO ELETROQUÍMICA DOS CORANTES REATIVOS PRETO 5 E AZUL 19 UTILIZANDO UM ELETRODO DE DIAMANTE DOPADO COM BORO NÃO COMERCIAL. Química Nova, v. 39, n. 9, p. 1051-1058, 2016-11-00. (11/15811-9, 14/11861-0, 13/15000-6)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

VASCONCELOS, Vanessa Moura. Electrochemical/chemical degradation of textile dyes Reactive Blue 19 and Reactive Black 5 using boron doped diamond electrodes and H2O2 electrogenerated in reticulated vitreous carbon electrode. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT) São Carlos.