Banca de DEFESA: RAINY ALVES DE SOUSA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : RAINY ALVES DE SOUSA
DATE: 21/07/2023
TIME: 09:00
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 aimed to apply an electrochemical technology, in order to, evaluate and analyze the efficiency on the degradation from model organic compound toward to carboxylic acids, as well as the simultaneous production of H2(g) in different electric current densities (15, 30 and 45mA/cm²) and for three different configurations on the electrochemical reactor. In first step, a three-compartment flow reactor in series mode was designed and fabricated, 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. Moreover, a mathematical model was developed to represent the reactor, as well as the reactions involved in the electrochemical process. The dye methyl orange (MO) was chosen as a model pollutant because it is a monoazo substance with a dark orange color and soluble in water, commonly used by the textile industries. The MO degradation process was monitored by absorption spectroscopy in the UV-vis region, Electroanalysis and FTIR. Meanwhilw, the quantification of carboxylic acids production, Ion Chromatography was performed. The results showed that the reactor used in the present work presented excellent results for the degradation of the organic compound, reaching 100% color removal after 60 minutes of electrolysis for all conditions studied. The FTIR data showed that there was degradation of the dye, mainly because we did not observe the peak presence corresponding to the binding of azo group at 1422 cm -1. Under the same conditions for degradation, a simultaneous production of green H2 of approximately 0.8 L was achieved. The carboxylic acids production was monitored over time for the different conditions tested, and it was observed that there was a selective production of malonic acid, the which opens up the possibility of future studies for the application of electro-refinery concept using these residues. The model showed good adherence to the experimental data, confirming that it can describe and predicting production under 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
Externo à Instituição - JOÃO MILLER DE MELO HENRIQUE - IFSERTAO
Externa ao Programa - ***.673.134-** - JUSSARA CÂMARA CARDOZO - UFRN