Anodic Linear Scan Voltametry in Effluents Contaminated with Hydrogen Sulfide (H2S)

Authors

  • Ana Flavia Ariello Universidade Federal do Paraná
  • Renata Bachmann Guimarães Valt Universidade Federal do Paraná
  • Marcelo Kaminski Lenzi Universidade Federal do Paraná
  • Haroldo de Araújo Ponte Universidade Federal do Paraná

DOI:

https://doi.org/10.20873/uftv8-11698

Abstract

In view of the highly toxic characteristic presented by hydrogen sulfide, a by-product of several industrial processes, its removal from an effluent becomes indispensable. Therefore, the electrochemical effect of H2S oxidation was evaluated, seeking to obtain the potential range and peak potential at which the oxidation reactions of the contaminant occur. For that, we used the anodic linear sweep voltammetry technique with the use of a reticulated vitreous carbon rotary working electrode. Using a synthetic solution in three concentrations, the scanning speeds for different rotations of the working electrode were varied between the potentials of -0.5 V (vs. ECS) and 1.0 V (vs. ECS), for using a potentiotate/galvanostat coupled to a computer. The results obtained indicate that the potentials, in which the reactions of interest occur, are close to 0.3 V (vs. ECS), which suggests the presence of the same reactions for all analyzed cases. It was observed in the voltamograms a proportional increase of the peak current with the sweep rate and concentration, indicating the control of the system by mass transport. Thus, the present study reveals that elemental sulfur does not passivate the electrode surface and that there is the possibility of using cross-linked glassy carbon electrodes to electrochemically oxidize sulfide ions in aqueous solutions.

Published

2021-06-28

How to Cite

Ariello, A. F., Bachmann Guimarães Valt, R. ., Kaminski Lenzi, M. ., & de Araújo Ponte, H. . (2021). Anodic Linear Scan Voltametry in Effluents Contaminated with Hydrogen Sulfide (H2S). DESAFIOS - Revista Interdisciplinar Da Universidade Federal Do Tocantins, 8(2), 110–118. https://doi.org/10.20873/uftv8-11698

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Artigos