Enhancement of organophosphate degradation by electroactive pyrrole and imidazole copolymers

Autor(es)

Hryniewicz, Bruna M. ^[1] ; Wolfart, Franciele ^[2] ; Gomez-Romero, Pedro ^[3] ; Orth, Elisa S. ^[4] ; Vidotti, Marcio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Parana, Dept Quim, Grp Pesquisa Macromol & Interfaces, CP 19032, BR-81531980 Curitiba, Parana - Brazil

^[2] Inst Fed Farroupilha, Campus Sao Borja, Rua Otaviano Castilho Mendes 355, BR-97670000 Sao Borja, RS - Brazil

^[3] Barcelona Inst Sci & Technol, CSIC, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193 - Spain

^[4] Univ Fed Parana, Dept Quim, Grp Catalise & Cinet, CP 19032, BR-81531980 Curitiba, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 338, APR 1 2020.
• Citações Web of Science: 0

Resumo

Many chemical warfare agents and agrochemicals are composed by organophosphates, that present high toxicity and difficult spontaneous degradation. Amongst the different catalysts to degrade these compounds, heterogeneous systems stand out since they provide easy recovery of the catalyst. However, the limited diffusion of the substrate decreases the rate of the reactions when compared to homogeneous catalysis. To reach a good efficiency in the dephosphorylation, we created heterogeneous catalysts based on pyrrole and imidazole that can enhance the degradation by different effects; both catalytic activity of imidazole and electroactivity of polypyrrole were evaluated. Spectroelectrochemical studies evidenced that the rate constant changes with the applied potential, indicating different reaction mechanisms with the material in the oxidized and neutral states. In summary, a new perspective allying conducting polymers with chemical catalysts was explored. This cooperative effect should be considered in future works concerning the search for new materials to monitor and eliminate organophosphates. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático