Electrochemically assisted photocatalytic degradation of contaminants of emerging concern in simulated wastewater using WO3 – Elucidation of mechanisms

Alvaro Tolosana; Stuart McMichael; Jeremy Hamilton; John Byrne; A P Fernandez-Ibanez

doi:10.1016/j.cej.2023.141442

Electrochemically assisted photocatalytic degradation of contaminants of emerging concern in simulated wastewater using WO3 – Elucidation of mechanisms

Alvaro Tolosana, Stuart McMichael, Jeremy Hamilton, John Byrne, A P Fernandez-Ibanez

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Abstract

In this work, the performance of a photoelectrochemical cell to degrade a mixture of contaminants of emerging concern (CECs) in distilled water and simulated wastewater effluents (SWWE) was assessed. The CECs mixture included trimethoprim (TMP), diclofenac (DFC), sulfamethoxazole (SMX) and carbamazepine (CBZ) (100 μg·L⁻¹ each). WO₃ nanoplate-like structures synthesized on fluorine tin oxide coated glass (FTO) were used as the photoanode with Pt or carbon gas diffusion electrodes (GDE) as the counter electrode. The most efficient degradation of the CECs was obtained with the WO₃-GDE combination. Significant degradation of the CECs was observed under visible only radiation. Even under visible radiation, reasonable rate constants 5.67·10^-3, 5.35·10^-3, 2.9·10^-3 and 4.35·10^-3min⁻¹ were obtained for TMP, SMX, CBZ and DFC degradation. The degradation mechanism at the cathode and the photoanode was elucidated using a two-compartment cell, which allowed the identification of reactive species generated at each electrode. Photogenerated holes were the main responsible for CEC degradation in SWWE. With the carbon GDE, a high Faradaic efficiency (55 %) for H₂O₂ production was observed.

Original language	English
Article number	141442
Pages (from-to)	1-12
Number of pages	12
Journal	Chemical Engineering Journal
Volume	458
Early online date	13 Jan 2023
DOIs	https://doi.org/10.1016/j.cej.2023.141442
Publication status	Published (in print/issue) - 15 Feb 2023

Bibliographical note

Funding Information:
The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER project (RIA GA-820718). Álvaro Tolosana Moranchel also thank the Consejería de Educación, Juventud y Deporte of the Comunidad de Madrid for the Ayuda Destinada a la Atracción de Talento Investigador (2020-T2/AMB-19927) granted to him.

Funding Information:
The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER project (RIA GA-820718). Álvaro Tolosana Moranchel also thank the Consejería de Educación, Juventud y Deporte of the Comunidad de Madrid for the Ayuda Destinada a la Atracción de Talento Investigador (2020-T2/AMB-19927) granted to him.

Publisher Copyright:
© 2023

Keywords

Carbon gas diffusion electrode
Contaminant of emerging concern
Photoelectrocatalysis
Reactive oxygen species
WO3 photoanode

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.cej.2023.141442

CEJ_Manuscript_acceptedAuthor Accepted Manuscript, 1.1 MBLicence: CC BY-NC-ND

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title = "Electrochemically assisted photocatalytic degradation of contaminants of emerging concern in simulated wastewater using WO3 – Elucidation of mechanisms",

abstract = "In this work, the performance of a photoelectrochemical cell to degrade a mixture of contaminants of emerging concern (CECs) in distilled water and simulated wastewater effluents (SWWE) was assessed. The CECs mixture included trimethoprim (TMP), diclofenac (DFC), sulfamethoxazole (SMX) and carbamazepine (CBZ) (100 μg·L−1 each). WO3 nanoplate-like structures synthesized on fluorine tin oxide coated glass (FTO) were used as the photoanode with Pt or carbon gas diffusion electrodes (GDE) as the counter electrode. The most efficient degradation of the CECs was obtained with the WO3-GDE combination. Significant degradation of the CECs was observed under visible only radiation. Even under visible radiation, reasonable rate constants 5.67·10-3, 5.35·10-3, 2.9·10-3 and 4.35·10-3 min−1 were obtained for TMP, SMX, CBZ and DFC degradation. The degradation mechanism at the cathode and the photoanode was elucidated using a two-compartment cell, which allowed the identification of reactive species generated at each electrode. Photogenerated holes were the main responsible for CEC degradation in SWWE. With the carbon GDE, a high Faradaic efficiency (55 %) for H2O2 production was observed.",

keywords = "Carbon gas diffusion electrode, Contaminant of emerging concern, Photoelectrocatalysis, Reactive oxygen species, WO3 photoanode",

author = "Alvaro Tolosana and Stuart McMichael and Jeremy Hamilton and John Byrne and Fernandez-Ibanez, {A P}",

note = "Funding Information: The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER project (RIA GA-820718). {\'A}lvaro Tolosana Moranchel also thank the Consejer{\'i}a de Educaci{\'o}n, Juventud y Deporte of the Comunidad de Madrid for the Ayuda Destinada a la Atracci{\'o}n de Talento Investigador (2020-T2/AMB-19927) granted to him. Funding Information: The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER project (RIA GA-820718). {\'A}lvaro Tolosana Moranchel also thank the Consejer{\'i}a de Educaci{\'o}n, Juventud y Deporte of the Comunidad de Madrid for the Ayuda Destinada a la Atracci{\'o}n de Talento Investigador (2020-T2/AMB-19927) granted to him. Publisher Copyright: {\textcopyright} 2023",

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AU - Tolosana, Alvaro

AU - McMichael, Stuart

AU - Hamilton, Jeremy

AU - Byrne, John

AU - Fernandez-Ibanez, A P

N1 - Funding Information: The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER project (RIA GA-820718). Álvaro Tolosana Moranchel also thank the Consejería de Educación, Juventud y Deporte of the Comunidad de Madrid for the Ayuda Destinada a la Atracción de Talento Investigador (2020-T2/AMB-19927) granted to him. Funding Information: The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER project (RIA GA-820718). Álvaro Tolosana Moranchel also thank the Consejería de Educación, Juventud y Deporte of the Comunidad de Madrid for the Ayuda Destinada a la Atracción de Talento Investigador (2020-T2/AMB-19927) granted to him. Publisher Copyright: © 2023

PY - 2023/2/15

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N2 - In this work, the performance of a photoelectrochemical cell to degrade a mixture of contaminants of emerging concern (CECs) in distilled water and simulated wastewater effluents (SWWE) was assessed. The CECs mixture included trimethoprim (TMP), diclofenac (DFC), sulfamethoxazole (SMX) and carbamazepine (CBZ) (100 μg·L−1 each). WO3 nanoplate-like structures synthesized on fluorine tin oxide coated glass (FTO) were used as the photoanode with Pt or carbon gas diffusion electrodes (GDE) as the counter electrode. The most efficient degradation of the CECs was obtained with the WO3-GDE combination. Significant degradation of the CECs was observed under visible only radiation. Even under visible radiation, reasonable rate constants 5.67·10-3, 5.35·10-3, 2.9·10-3 and 4.35·10-3 min−1 were obtained for TMP, SMX, CBZ and DFC degradation. The degradation mechanism at the cathode and the photoanode was elucidated using a two-compartment cell, which allowed the identification of reactive species generated at each electrode. Photogenerated holes were the main responsible for CEC degradation in SWWE. With the carbon GDE, a high Faradaic efficiency (55 %) for H2O2 production was observed.

AB - In this work, the performance of a photoelectrochemical cell to degrade a mixture of contaminants of emerging concern (CECs) in distilled water and simulated wastewater effluents (SWWE) was assessed. The CECs mixture included trimethoprim (TMP), diclofenac (DFC), sulfamethoxazole (SMX) and carbamazepine (CBZ) (100 μg·L−1 each). WO3 nanoplate-like structures synthesized on fluorine tin oxide coated glass (FTO) were used as the photoanode with Pt or carbon gas diffusion electrodes (GDE) as the counter electrode. The most efficient degradation of the CECs was obtained with the WO3-GDE combination. Significant degradation of the CECs was observed under visible only radiation. Even under visible radiation, reasonable rate constants 5.67·10-3, 5.35·10-3, 2.9·10-3 and 4.35·10-3 min−1 were obtained for TMP, SMX, CBZ and DFC degradation. The degradation mechanism at the cathode and the photoanode was elucidated using a two-compartment cell, which allowed the identification of reactive species generated at each electrode. Photogenerated holes were the main responsible for CEC degradation in SWWE. With the carbon GDE, a high Faradaic efficiency (55 %) for H2O2 production was observed.

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KW - Reactive oxygen species

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M3 - Article

SN - 1385-8947

VL - 458

SP - 1

EP - 12

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

M1 - 141442

ER -

Electrochemically assisted photocatalytic degradation of contaminants of emerging concern in simulated wastewater using WO3 – Elucidation of mechanisms

Abstract

Bibliographical note

Keywords

UN SDGs

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