Banca de DEFESA: IZABELLE CRISTINA DA COSTA SOARES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : IZABELLE CRISTINA DA COSTA SOARES
DATA : 25/11/2016
HORA: 14:00
LOCAL: Sala de treinamentos NUPER
TÍTULO:

Study of the influence of different functional groups on textile dyes on the application of the Electrochemical Advanced Oxidation Processes (PEOAs) for decolorizing and remediation of their effluents

PALAVRAS-CHAVES:

Textile dyes. Electrochemical Advanced Oxidation Processes. Electro-Fenton.

PÁGINAS: 70
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Eletroanalítica
RESUMO:

The water quality as well as its pollution, has caused great concern in the scientific community. This problem has been accompanied by growing public interest that has generated a political demand to legislate more strictly emission limits and the water pollutant content (RAMÍREZ et al., 2013). The textile industry has been one of causing environmental pollution, mainly due to the generation of a large amount of waste due to the high organic load and intense color of their production. The organic dyes used extensively in various branches of the textile industry, are known to be very toxic, mutagenic and carcinogenic, and cause aesthetic pollution and irreversible damage to aquatic ecosystems and human health. Within this context, electrochemical technologies of water treatment are highly promising for decolorization dye dyed effluents, as demonstrated in several studies on the subject. Therefore, in the present study, we compared different Processes Electrochemical Advanced Oxidation (EOAPs) and their potential in discoloration and remediation of contaminated textile effluents, as well as discoloration to the influence of different functional groups which modify the dyestuff structure conditioning the discoloration. The azos reactive textile dye Reactive Orange 16, Reactive Violet 4, Reactive Red 228 and Reactive Black 5 have been selected for presenting the same structure of the molecular basis with different functional groups. The results demonstrate that the functional groups that reduce the nucleophilicity of the pollutant hinder the electrophilic attack of electrogenerated hydroxyl radical. Thereby, the overall decolorization efficiency is consequently reduced as well as the decolorization rate. Moreover, the presence of an additional chromophore azo bond in the molecule enhances the recalcitrant character of the azo dyes as pollutants due to the formation of a larger and more stable conjugated π system, becoming greater the activation energy required for the electrophyilic attack of ^●OH and also affecting the performance of electrochemical technologies on effluents decolorization.

MEMBROS DA BANCA:
Externo à Instituição - ADRIANA NUNES CORREIA - UFC
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Interno - 348475 - DJALMA RIBEIRO DA SILVA
Externo ao Programa - 2524058 - DOUGLAS DO NASCIMENTO SILVA