Electrochemical Oxidation Using Parallel Plate Flow Reactors as an Alternative Technique to Treat Single and Trichromy Dye Effluents

Autor(es)

Maiara B. Ferreira ^[1] ; Elaine Cristina M. de Moura Santos ^[2] ; José H. Oliveira Nascimento ^[3] ; Felipe M. Fontes Galvão ^[4] ; Elisama Vieira dos Santos ^[5] ; José Eudes Lima Santos ^[6] ; Patricio J. Espinoza-Montero ^[7] ; Carlos A. Martínez-Huitle ^[8]

Afiliação do(s) autor(es)

^[1] Federal University of Rio Grande do Norte. Campus Universitário - Brasil

^[2] Federal University of Rio Grande do Norte. Campus Universitário - Brasil

^[3] Federal University of Rio Grande do Norte. Department of Textile Engineering - Brasil

^[4] Federal University of Rio Grande do Norte. Department of Textile Engineering - Brasil

^[5] Federal University of Rio Grande do Norte. Campus Universitário - Brasil

^[6] Federal University of Rio Grande do Norte. Campus Universitário - Brasil

^[7] Pontificia Universidad Católica del Ecuador - Equador

^[8] Federal University of Rio Grande do Norte. Campus Universitário - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Mexican Chemical Society; v. 67, n. 4, p. 432-447, 2024-04-26.

Resumo

Abstract. Electrochemical oxidation (EO) has been investigated as an alternative treatment technique for the remediation of real textile effluents containing a single dye and a trichromy of Remazol Yellow 3RS (RY 3RS), Remazol Red RR Gran (RR-RR Gran) and Navy Blue CL-R (NB CL-R) dyes, using a parallel plate flow reactor equipped with Ti/Pt or Ti/Pt-Sn-Sb electrocatalytic materials and Ti as cathode. The influence of the anode material and applied current densities on decolourization, organic matter decrease, cell potential and energy consumption during EO was examined. Higher color removal was achieved with Ti/Pt-Sn-Sb in all treated effluents compared to Ti/Pt at all electrolysis times, due to high oxidant production, especially hydroxyl radicals on their surface. Polymer film formation on the anode surface inhibited chemical oxygen demand (COD) removal during the treatment of a single effluent containing RY 3RS and RR-RR Gran dyes with either anode, whereas COD removal efficiencies of 13.93 % and 30.03 %, and 54.74 % and 74.48 % were obtained for Ti/Pt and Ti/Pt-Sn-Sb, respectively, in treating trichromy effluent after 240 min of electrolysis. Lower energy consumption was required by Ti/Pt-Sn-Sb compared to the Ti/Pt anode. In most of the trials studied, EO enhanced dissolved oxygen (DO) and reduced effluent turbidity, making it safe for disposal in the environment. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático