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Template-made tailored mesoporous Ti/SnO2-Sb2O5-IrO2 anodes with enhanced activity towards dye removal

Template-made tailored mesoporous Ti/SnO2-Sb2O5-IrO2 anodes with enhanced activity towards dye removal
Template-made tailored mesoporous Ti/SnO2-Sb2O5-IrO2 anodes with enhanced activity towards dye removal
The mixed metal-oxide anode Ti/SnO2–Sb2O5–IrO2 is a prominent candidate for the electro-oxidation of organic compounds in wastewater treatment systems. The catalytic activity of this material depends on its surface morphology, which strongly depends on the synthesis method used. Hence, here we manufactured innovative Ti/SnO2–Sb2O5–IrO2 anodes using micelle templates made of amphiphilic block-copolymers and compared them with anodes made of the same composition using the Pechini method. Scanning electron microscopy, X-ray dispersive energy analysis, X-ray diffraction, cyclic voltammetry, and electrochemical impedance spectroscopy were used to characterise the morphology, composition, and electrochemical properties of the developed anodes. The "template method" produces anodes with mesoporous surfaces (11.0±4 nm of pore diameter), which enhanced the electroactive area compared with the anodes made through the Pechini method. The templated anodes are more conductive than the Pechini-made ones and are more active for removing the reactive black 5-dye from 0.1 mol dm–3 Na2SO4 aqueous solutions. The enhanced catalytic activity of the templated anode strongly increases with the addition of low concentrations of NaCl. The rate constants increase 3.9 and 4.7-fold when adding 200 ppm and 1168.8-ppm chloride, respectively. The templated anode removes 100% of the dye after only 15 min of electrolysis applying 20 mA cm–2 and leads to ~50% mineralization after 60 min of oxidation. Notably, the template anode is 3-fold more stable in accelerated service lifetime tests than the Pechini-made anode. Therefore, our study shows that Ti/SnO2–Sb2O5–IrO2 anodes made using the template method are highly promising for the electrochemical treatment of wastewater polluted with organic compounds.
mesoporous films, Oxidative degradation, Anode materials, Electrocatalysis
1572-6657
Eguiluz, Katlin I.B.
59d40318-d101-44e0-b00c-b8f30aa1baf4
Hernandez Sanchez, Nicolas Kinich
87e78cc8-95de-4773-8a26-30a3b5b6486a
Dória, Aline R.
2f9fccc6-936c-4619-a76a-050789c8a1df
Santos,, Géssica O. S.
50b80c95-d905-4ee9-b2f0-92c005ea7989
Salazar-Banda, Giancarlo R.
80800367-cb82-42ad-8137-83e98dbf4ecb
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Eguiluz, Katlin I.B.
59d40318-d101-44e0-b00c-b8f30aa1baf4
Hernandez Sanchez, Nicolas Kinich
87e78cc8-95de-4773-8a26-30a3b5b6486a
Dória, Aline R.
2f9fccc6-936c-4619-a76a-050789c8a1df
Santos,, Géssica O. S.
50b80c95-d905-4ee9-b2f0-92c005ea7989
Salazar-Banda, Giancarlo R.
80800367-cb82-42ad-8137-83e98dbf4ecb
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c

Eguiluz, Katlin I.B., Hernandez Sanchez, Nicolas Kinich, Dória, Aline R., Santos,, Géssica O. S., Salazar-Banda, Giancarlo R. and Ponce De Leon Albarran, Carlos (2022) Template-made tailored mesoporous Ti/SnO2-Sb2O5-IrO2 anodes with enhanced activity towards dye removal. Journal of Electroanalytical Chemistry, 910, [116153].

Record type: Article

Abstract

The mixed metal-oxide anode Ti/SnO2–Sb2O5–IrO2 is a prominent candidate for the electro-oxidation of organic compounds in wastewater treatment systems. The catalytic activity of this material depends on its surface morphology, which strongly depends on the synthesis method used. Hence, here we manufactured innovative Ti/SnO2–Sb2O5–IrO2 anodes using micelle templates made of amphiphilic block-copolymers and compared them with anodes made of the same composition using the Pechini method. Scanning electron microscopy, X-ray dispersive energy analysis, X-ray diffraction, cyclic voltammetry, and electrochemical impedance spectroscopy were used to characterise the morphology, composition, and electrochemical properties of the developed anodes. The "template method" produces anodes with mesoporous surfaces (11.0±4 nm of pore diameter), which enhanced the electroactive area compared with the anodes made through the Pechini method. The templated anodes are more conductive than the Pechini-made ones and are more active for removing the reactive black 5-dye from 0.1 mol dm–3 Na2SO4 aqueous solutions. The enhanced catalytic activity of the templated anode strongly increases with the addition of low concentrations of NaCl. The rate constants increase 3.9 and 4.7-fold when adding 200 ppm and 1168.8-ppm chloride, respectively. The templated anode removes 100% of the dye after only 15 min of electrolysis applying 20 mA cm–2 and leads to ~50% mineralization after 60 min of oxidation. Notably, the template anode is 3-fold more stable in accelerated service lifetime tests than the Pechini-made anode. Therefore, our study shows that Ti/SnO2–Sb2O5–IrO2 anodes made using the template method are highly promising for the electrochemical treatment of wastewater polluted with organic compounds.

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Corrected manuscript Eguiluz et al. - Accepted Manuscript
Restricted to Repository staff only until 17 February 2023.
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More information

Accepted/In Press date: 15 February 2022
e-pub ahead of print date: 17 February 2022
Published date: 1 April 2022
Keywords: mesoporous films, Oxidative degradation, Anode materials, Electrocatalysis

Identifiers

Local EPrints ID: 455171
URI: http://eprints.soton.ac.uk/id/eprint/455171
ISSN: 1572-6657
PURE UUID: 1c4b0fb5-886e-4c75-931e-991eabfba041
ORCID for Nicolas Kinich Hernandez Sanchez: ORCID iD orcid.org/0000-0001-5177-9622
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 11 Mar 2022 17:31
Last modified: 12 Mar 2022 02:39

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Contributors

Author: Katlin I.B. Eguiluz
Author: Nicolas Kinich Hernandez Sanchez ORCID iD
Author: Aline R. Dória
Author: Géssica O. S. Santos,
Author: Giancarlo R. Salazar-Banda

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