Photoelectrocatalytic degradation of 2,4-dichlorophenol in a TiO2 nanotube-coated disc flow reactor

Renato Martin Montenegro Ayo, Alberto Corzo Lucioni, Hugo Arturo Alarcon Cavero, Juan Carlos Morales Gomero, Paul K. Westerhoff, Sergi Garcia Segura

Resultado de la investigación: Contribución a una revistaArtículo (Contribución a Revista)revisión exhaustiva

2 Citas (Scopus)

Resumen

Photoelectrocatalytic (PEC) water treatment is a promising technology for organic pollution abatement. Much of the prior research focused on material discovery and optimization. However, challenges exist in scaling-up PEC processes and are associated with designing reactors with effective light irradiation on electrode surfaces and, simultaneously, efficient electrode configurations. We design and demonstrate key reactor design principles, which influence reaction mechanisms, for a reactor using a TiO2 nanotube-coated disc flow reactor. Degradation of organochlorinated 2,4-dichlorophenol was studied as representative carcinogenic micropollutant. The synergistic photoelectrocatalytic process showed 5-fold faster degradation kinetics than solely electrocatalytic treatment or a greater than 2-fold enhancement over photocatalysis alone. Applicability of photoelectrocatalytic treatment was demonstrated over a wide range of micropollutant concentrations with almost complete abatement even at concentrations up to 25 mg L-1 of 2,4-dichlorophenol. Mechanistically, the increase in applied current density efficiency for degradation of 2,4-dichlorophenol was due to stabilization of charge carriers and higher oxidants production rates in the PEC system. Carboxylic acids were identified as the main by-products formed from cleavage of the phenolic ring moieties in 2,4-dichlorophenol. However, very importantly we achieved dehalogenation photoelectrocatalysis with evidence of chlorine heteroatoms released as innocuous chloride anions. Overall, this research demonstrates the importance of PEC reactor design and how properly orientated TiO2 nanotube-coated disc flow reactors leverage both novel material designs and reactor architectures to achieve pollutant degradation.
Idioma originalInglés estadounidense
Número de artículo129320
PublicaciónChemosphere
Volumen268
DOI
EstadoPublicada - 1 abr 2021

COAR

  • Artículo

Categoría OCDE

  • Ingeniería industrial

Categorías Repositorio Ulima

  • Ingeniería industrial / Diseño e innovación

Temas Repositorio Ulima

  • Electrocatalysis
  • Electrocatálisis
  • Nanotechnology
  • Nanotecnología
  • Tratamiento del agua
  • Water treatment

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