Banca de DEFESA: EDILSON DO VALE JUNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : EDILSON DO VALE JUNIOR
DATA : 28/11/2016
HORA: 16:30
LOCAL: Sala de treinamento do NUP-ER
TÍTULO:

STUDY OF ALTERNATIVE MATERIALS FOR THE REMOVAL OF ORGANIC COMPOUNDS FROM WASTEWATER BY ANODIC OXIDATION

PALAVRAS-CHAVES:

Wastewater treatment; dyes; thermal projection; dimensional stable anode; electrochemical oxidation

PÁGINAS: 53
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Eletroquímica
RESUMO:

Anodic oxidation is a type of electrochemical advanced oxidation process, which enables the degradation and mineralization of organic compounds. This mineralization occurs preferably in two ways. The first is due to load transfer directly to the anode surface and the second occurs through an indirect oxidation by generating strongly oxidizing species which may be physically adsorbed as hydroxyl radical (● OH), or chemically adsorbed on the electrode surface. The latter has a higher rate of treatment, because when radicals are physically adsorbed, the reactions that allow the degradation of my organic substrate of interest is not limited to the anode surface. What will limit treatment to a particular form of oxidation is the choice of electrode used, in which case the anode and the electrocatalytic properties of the same. The major problem is that depending on the choice of the electrode, side reactions may occur production of oxidants, such as the reaction of oxygen evolution. In literature, two catalytic materials stand for degradation and mineralization of organic compounds, they are diamond electrodes doped with boron (DDB) and lead oxide. Despite the DDB present excellent electrochemical properties, such as electrochemical stability, corrosion stability, be inert presenting low adsorption properties and hardness. In addition to presenting an enormous capacity for the production of hydroxyl radicals, it has a high cost, which is not seen with good eyes by the industrial sector. Lead oxide also has excellent catalytic properties and high content of removing organic contaminants, the big problem is high toxicity of lead. In this context many researchers have devoted great efforts to identify more affordable electrodic materials as an alternative to reduce the initial investment and operating costs. This is the case of dimensional stable anodes and other metal anodes. The Babbitt alloys are commonly used as bearing metal due to its high resistance to wear and corrosion, but such alloys have not been considered for possible application of electrochemistry. In this context, tin-based alloys have been considered as an interesting alternative, using them as anodes for the anodic oxidation process. Therefore, in this paper, an anode formed by a Sn-Cu Sb alloy (Babbitt) was synthesized from the cold gas projection technology to assess their potential application to electrochemical treatment as a new cheap and stable anodic material. The electrochemical properties of the synthesized anode were tested in the reduction of discoloration and chemical oxygen demand (COD) of an azo dye. Moreover, the evolution of nitrogenous carboxylic acids and inorganic species generated by the oxidation breaks molecule (•OH) were evaluated by HPLC analysis.

MEMBROS DA BANCA:
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Externo ao Programa - 1199268 - JAILSON VIEIRA DE MELO
Externo ao Programa - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Interno - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Externo à Instituição - SUELY SOUZA LEAL DE CASTRO - UERN