Investigation of the electrochemical technology for the electrochemical ozone production: fundamental and applied aspects

Author(s)

Leonardo Morais da Silva

• Document type: Doctoral Thesis
• Press: Ribeirão Preto. , gráficos, ilustrações, tabelas.
• Institution: Universidade de São Paulo (USP). Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (PCARP/BC)
• Defense date: 2004-05-07

Examining board members

Julien Francoise Coleta Boodts; Luis Alberto Avaca; Artur de Jesus Motheo; Paulo Olivi; Edson Antonio Ticianelli

• Advisor: Julien Francoise Coleta Boodts
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP
• Location: Universidade de São Paulo. Biblioteca Central do Campus de Ribeirão Preto; Silva, Leonardo Morais da

Abstract

After a critical discussion about the environmental pollution resulted from the continuous consumption of the natural energy sources, is discussed in the Thesis the role of the ozone on reduction of the pollution burden released in the environment by different urban and industrial effluents. Different technologies available for the ozone production in the low and large scale are presented and discussed, given a special attention for the electrochemical ozone production, EOP, which is the issue under investigation in the experimental section of the Thesis. The experiments were separated in fundamentals, which comprises the investigation of EOP at PbO2 and IrO2+Ta2O5 electrodes, in different conditions of the temperature and composition of the electrolyte, and applied studies, where is proposed and characterised a reactor for EOP having a capacity of up to 100 A. In the fundamental section one proposed a new electrochemical methodology for characterisation of porous/rugged electrodes, which is based on a combined analysis of the intensive and extensive surface parameters. From the kinetic data it was proposed a electrode mechanism representative of the simultaneous production of oxygen and ozone, which makes possible to analyse the EOP current efficiency considering the surface coverage by the oxygenated reaction intermediates. The characterisation of the electrochemical reactor (prototype #1), which was constructed using a planar perforated PbO2 as anode and a solid polymer electrolyte (Nafion 117) as separator of the cathodic and anodic compartments, revealed that EOP is a promising alternative technology to the conventional corona process used in the ozone generation in the gaseous phase. P.S. For more details about the present Thesis in a English version see references extracted from this contribution already cited as a header in the main chapters. (AU)