Soares, Izabelle Cristina da CostaSilva, Djalma Ribeiro daNascimento, José Heriberto Oliveira doGarcia-Segura, SergiMartínez-Huitle, Carlos Alberto2021-12-022021-12-022017-09-07SOARES, Izabelle Cristina da Costa; SILVA, Djalma Ribeiro da; NASCIMENTO, José Heriberto Oliveira do; GARCIA-SEGURA, Sergi; MARTÍNEZ-HUITLE, Carlos Alberto. Functional group influences on the reactive azo dye decolorization performance by electrochemical oxidation and electro-Fenton technologies. Environmental Science And Pollution Research, [S.l.], v. 24, n. 31, p. 24167-24176, 7 set. 2017. Springer Science and Business Media LLC. Disponível em:https://link.springer.com/content/pdf/10.1007/s11356-017-0041-z.pdf. Acesso em: 17 out. 2021. DOI: 10.1007/s11356-017-0041-z0944-13441614-7499https://repositorio.ufrn.br/handle/123456789/45129Electrochemical water treatment technologies are highly promising to achieve complete decolorization of dyebath effluents, as demonstrated by several studies reported in the literature. However, these works are focused on the treatment of one model pollutant and generalize the perfor mances of the processes which are not transposable since they depend on the pollutant treated. Thus, in the present study, we evaluate, for the first time, the influence of different functional groups that modify the dye structure on the electrochemical process decolorization performance. The textile azo dyes Reactive Orange 16, Reactive Violet 4, Reactive Red 228, and Reactive Black 5 have been selected because they present the same molecular basis structure with different functional groups. The results demonstrate that the functional groups that reduce the nucleophilicity of the pollutant hinder the electro philic 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. The formation of a larger and more stable conjugated π system increases the activation energy required for the electrophyilic attack of • OH, affecting the performance of electrochemical technologies on effluent decolorizationAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/Wastewater treatmentElectro-FentonReactive azo dyesElectrochemical advanced oxidation processesBoron-doped diamond anodearticle