Photoelectrocatalytic decolorization of azo dyes with nano-composite oxide layers of ZnO nanorods decorated with Ag nanoparticles

Gabriel Antonio Cerrón-Calle, Alejandro Junior Aranda-Aguirre, Clemente Luyo, Sergio GARCIA SEGURA, Hugo Alarcón

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Photoelectrocatalysis provides an excellent frame for the application of photocatalytic nanostructured materials on easy recoverable supports. This study reports the two-step synthesis of hierarchically nanostructured ZnO/Ag composite photoelectrodes. Wurtzite ZnO was selectively electronucleated as spheroidal seeds on fluor doped tin oxide substrates and nanodecorated with Ag nanoclusters under electrochemical control. Hierarchically organized nanorods were selectively chemically grown on the plane (002) perpendicular to the substrate from ZnO/Ag seeds. Solutions emulating dye effluents with the usual contents of 0.1 M of NaCl and a model azo dye (Methyl Orange) were decolorized using ZnO/Ag nanorods in different treatments. Photocatalysis attained discrete decolorizations of 8% whereas photoelectrocatalysis completely decolorized solutions after 60 min. The influence of the metal/semiconductor interface (ZnO/Ag) as introduced Schottky barrier is studied demonstrating a four-fold enhancement on decolorization kinetics respect bare ZnO nanorods. The influence of the seed growth control on the final photoelectrocatalytic response is reported to control the hierarchical organization of nanorods. This resulted in different decolorization kinetics as result of the differences on the efficient use of the delivered photons conditioned by the photoelectrode structure.

Original languageEnglish (US)
Pages (from-to)296-304
Number of pages9
JournalChemosphere
DOIs
StatePublished - Mar 1 2019

Fingerprint

Azo Compounds
Nanotubes
Azo dyes
Nanorods
Nanoparticles
Oxides
dye
oxide
seed
Seed
Seeds
Composite materials
substrate
kinetics
tin
Semiconductors
Kinetics
Nanostructures
Photocatalysis
Nanoclusters

Keywords

  • Electrochemical water treatment
  • Metallic/semiconductor composite photocatalysts
  • Nano-coating
  • Photocatalysis
  • Photocathode

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Photoelectrocatalytic decolorization of azo dyes with nano-composite oxide layers of ZnO nanorods decorated with Ag nanoparticles. / Cerrón-Calle, Gabriel Antonio; Aranda-Aguirre, Alejandro Junior; Luyo, Clemente; GARCIA SEGURA, Sergio; Alarcón, Hugo.

In: Chemosphere, 01.03.2019, p. 296-304.

Research output: Contribution to journalArticle

Cerrón-Calle, Gabriel Antonio ; Aranda-Aguirre, Alejandro Junior ; Luyo, Clemente ; GARCIA SEGURA, Sergio ; Alarcón, Hugo. / Photoelectrocatalytic decolorization of azo dyes with nano-composite oxide layers of ZnO nanorods decorated with Ag nanoparticles. In: Chemosphere. 2019 ; pp. 296-304.
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