Banca de QUALIFICAÇÃO: RAINY ALVES DE SOUSA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RAINY ALVES DE SOUSA
DATE: 05/06/2023
TIME: 09:30
LOCAL: Auditório do NUPPRAR
TITLE:

Electrochemistry as a sustainable method for simultaneous production of green hydrogen and carboxylic acids

KEY WORDS:

Green hydrogen; Carboxylic Acids; Electrorefinery; Sustainable Development; Electrochemical Reactor; Modeling and Simulation.

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

The present work aims to apply electrochemical technology in order to evaluate the electrochemical degradation of a model organic compound and to analyze the efficiency of electro chemical conversion of carboxylic acids as well as the simultaneous production of H2(g) in electric current densities (15, 30 and 45mA/cm2) and for three different configurations of the electro-chemical reactor. Initially, a three-compartment flow reactor was developed, in serial mode and combining the electrocatalytic properties of two non-active anodes (PbO2-F and BDD) and a stainless steel mesh cathode separated by two Nafion 350® membranes, to assess the economic and energy point of view of the system, powered by a solar power source. Finally, a mathematical model was developed to represent the reactor, as well as the reactions involved in the electrochemical process. The methyl orange dye (AM) was chosen as a model organic pollutant because it is a dark orange-coloured, water-soluble monoazo substance commonly used by the textile industries. The AM degradation process was monitored by absorption spectroscopy in the UV-Vis, Electroanalysis and FTIR region. For the quantification of the production of carboxylic acids, ion cromatography was performed. The results showed that the reactor employed in this work showed an efficiency for organic compound degradation, obtaining color removal values of 100% from 60 minutes for all studied conditions. The FTIR data proved that there was degradation of the dye mainly because we did not observe the presence of the peak corresponding to the binding of the azo group at 1366 cm-1. The production of carboxylic acids was monitored over time for the different tested conditions, and it was observed that a selective production of malonic acid occurred, which opens the possibility of future studies for the application of the concept of electro-refinery through these wastes. The model was validated along with the experimental data and adjusted very well, confirming that the model can describe the electrochemical reactor as well as prove its future use for prediction of different operating conditions.

COMMITTEE MEMBERS:
Externo ao Programa - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE - nullInterno - 1584174 - DOMINGOS FABIANO DE SANTANA SOUZA
Presidente - 2275848 - ELISAMA VIEIRA DOS SANTOS
Externa à Instituição - JUSSARA CÂMARA CARDOZO - UFRN