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Improved 4-nitrophenol removal at Ti/RuO2-Sb2O4-TiO2 laser-made anodes.

Authors
  • Dória, Aline R1, 2
  • Santos, Géssica O S3, 4
  • Pelegrinelli, Mariane M S1
  • Silva, Deyvid C5
  • de Matos, Danielle B2, 6
  • Cavalcanti, Eliane Bezerra2, 6
  • Silva, Ronaldo S5
  • Salazar-Banda, Giancarlo R1, 2
  • Eguiluz, Katlin I B1, 2
  • 1 Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), Aracaju, SE, Brazil. , (Brazil)
  • 2 Postgraduate Program in Process Engineering (PEP), Tiradentes University, Aracaju, SE, Brazil. , (Brazil)
  • 3 Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), Aracaju, SE, Brazil. [email protected] , (Brazil)
  • 4 Postgraduate Program in Process Engineering (PEP), Tiradentes University, Aracaju, SE, Brazil. [email protected] , (Brazil)
  • 5 Functional Nanomaterials Group, Department of Physics, Federal University of Sergipe, São Cristóvão, SE, Brazil. , (Brazil)
  • 6 Waste and Sewage Treatment Laboratory, Institute of Technology and Research (ITP), Aracaju, SE, Brazil. , (Brazil)
Type
Published Article
Journal
Environmental Science and Pollution Research
Publisher
Springer-Verlag
Publication Date
May 01, 2021
Volume
28
Issue
19
Pages
23634–23646
Identifiers
DOI: 10.1007/s11356-020-10451-6
PMID: 32812159
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In this study, binary and ternary mixed metal oxide anodes of Ti/RuO2-Sb2O4 and Ti/RuO2-Sb2O4-TiO2 were prepared using two different heating methods: conventional furnace and alternative CO2 laser heating. The produced anodes were physically and electrochemically characterized by using different techniques. The main difference found in the laser-made anodes was their more compact morphology, without the common deep cracks found in anodes made by typical thermal decomposition, which showed an important correlation with the prolonged accelerated service life. The correlation between the physicochemical properties of the anodes with their performance towards the 4-nitrophenol oxidations is discussed. The results demonstrated that the ternary anode (Ti/RuO2-Sb2O4-TiO2) is very promising, presenting a kinetic 5.7 times faster than the respective binary anode and the highest removal efficiency when compared with conventionally made anodes. Also, the lowest energy consumption per unit of mass of contaminant removed is seen for the laser-made Ti/RuO2-Sb2O4-TiO2 anode, which evidences the excellent cost-benefit of this anode material. Finally, some by-products were identified, and a degradation route is proposed. Graphical abstract.

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