Ag<inf>2</inf>O/TiO<inf>2</inf> nanostructures for the photocatalytic mineralization of the highly recalcitrant pollutant iopromide in pure and tap water

J. C. Durán-Álvarez, V. A. Hernández-Morales, M. Rodríguez-Varela, D. Guerrero-Araque, D. Ramirez-Ortega, F. Castillón, P. Acevedo-Peña, R. Zanella

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

© 2019 Elsevier B.V. TiO2 was modified by the deposition of Ag2O nanoparticles to increase the photocatalytic degradation of iopromide in water under UV–C (λ = 254 nm) and UV–A/visible light irradiation (380–800 nm) using pure and tap water. Several loadings of Ag2O were deposited on TiO2, namely 0.03, 0.15, 0.25, 0.65, 1.0, 1.15, 1.35 and 1.8 wt. %. XRD, TEM, BET, ICP-OES, XPS, DRS and cathodoluminescence spectroscopy were carried out to characterize the materials, while semiconducting properties of the composite were elucidated through electrochemical and photoelectrochemical characterization. Under UV–C light irradiation, the Ag2O/TiO2 heterostructures showed higher mineralization of iopromide (up to 86%, using the 1.15 wt. % Ag2O/TiO2 material) than unmodified materials (37% for TiO2 and 14% for Ag2O), indicating a synergistic effect by the combination of both compounds in the composite. Under UV–A/visible light irradiation, mineralization achieved with the 1.15 wt. % Ag2O/TiO2 material decreased up to 65%, which was again higher than that obtained for its single components. Stability of the photocatalyst was observed through three consecutive reaction cycles under UV–A/visible light irradiation. In tap water, environmentally relevant concentrations of iopromide were tested (Co = 50 μg L−1), resulting in a high degradation rate, while mineralization dramatically decreased because of the matrix effect. Some by-products were identified by mass spectroscopy and a possible degradation path was proposed. The outstanding photocatalytic activity of the Ag2O/TiO2 materials was explained by the electron trap effect exerted by Ag2O, along with the appearance of different silver species (Ag2O, Ag2O2 and Ag°) throughout the photocatalytic reaction, enhancing the mobility of the charge carriers and thus the generation of reactive species on the photocatalyst surface.
Original languageAmerican English
JournalCatalysis Today
DOIs
StatePublished - 1 Jan 2019
Externally publishedYes

Fingerprint

iopromide
Nanostructures
mineralization
irradiation
pollutant
Water
Irradiation
Photocatalysts
Degradation
degradation
water
spectroscopy
Spectroscopy
Electron traps
Cathodoluminescence
cathodoluminescence
Composite materials
Charge carriers
Silver
X-ray spectroscopy

Cite this

Durán-Álvarez, J. C., Hernández-Morales, V. A., Rodríguez-Varela, M., Guerrero-Araque, D., Ramirez-Ortega, D., Castillón, F., ... Zanella, R. (2019). Ag<inf>2</inf>O/TiO<inf>2</inf> nanostructures for the photocatalytic mineralization of the highly recalcitrant pollutant iopromide in pure and tap water. Catalysis Today. https://doi.org/10.1016/j.cattod.2019.01.027
Durán-Álvarez, J. C. ; Hernández-Morales, V. A. ; Rodríguez-Varela, M. ; Guerrero-Araque, D. ; Ramirez-Ortega, D. ; Castillón, F. ; Acevedo-Peña, P. ; Zanella, R. / Ag<inf>2</inf>O/TiO<inf>2</inf> nanostructures for the photocatalytic mineralization of the highly recalcitrant pollutant iopromide in pure and tap water. In: Catalysis Today. 2019.
@article{5fbfe2143c614c50854b5c1dd0164c27,
title = "Ag2O/TiO2 nanostructures for the photocatalytic mineralization of the highly recalcitrant pollutant iopromide in pure and tap water",
abstract = "{\circledC} 2019 Elsevier B.V. TiO2 was modified by the deposition of Ag2O nanoparticles to increase the photocatalytic degradation of iopromide in water under UV–C (λ = 254 nm) and UV–A/visible light irradiation (380–800 nm) using pure and tap water. Several loadings of Ag2O were deposited on TiO2, namely 0.03, 0.15, 0.25, 0.65, 1.0, 1.15, 1.35 and 1.8 wt. {\%}. XRD, TEM, BET, ICP-OES, XPS, DRS and cathodoluminescence spectroscopy were carried out to characterize the materials, while semiconducting properties of the composite were elucidated through electrochemical and photoelectrochemical characterization. Under UV–C light irradiation, the Ag2O/TiO2 heterostructures showed higher mineralization of iopromide (up to 86{\%}, using the 1.15 wt. {\%} Ag2O/TiO2 material) than unmodified materials (37{\%} for TiO2 and 14{\%} for Ag2O), indicating a synergistic effect by the combination of both compounds in the composite. Under UV–A/visible light irradiation, mineralization achieved with the 1.15 wt. {\%} Ag2O/TiO2 material decreased up to 65{\%}, which was again higher than that obtained for its single components. Stability of the photocatalyst was observed through three consecutive reaction cycles under UV–A/visible light irradiation. In tap water, environmentally relevant concentrations of iopromide were tested (Co = 50 μg L−1), resulting in a high degradation rate, while mineralization dramatically decreased because of the matrix effect. Some by-products were identified by mass spectroscopy and a possible degradation path was proposed. The outstanding photocatalytic activity of the Ag2O/TiO2 materials was explained by the electron trap effect exerted by Ag2O, along with the appearance of different silver species (Ag2O, Ag2O2 and Ag°) throughout the photocatalytic reaction, enhancing the mobility of the charge carriers and thus the generation of reactive species on the photocatalyst surface.",
author = "Dur{\'a}n-{\'A}lvarez, {J. C.} and Hern{\'a}ndez-Morales, {V. A.} and M. Rodr{\'i}guez-Varela and D. Guerrero-Araque and D. Ramirez-Ortega and F. Castill{\'o}n and P. Acevedo-Pe{\~n}a and R. Zanella",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.cattod.2019.01.027",
language = "American English",
journal = "Catalysis Today",
issn = "0920-5861",
publisher = "Elsevier",

}

Ag<inf>2</inf>O/TiO<inf>2</inf> nanostructures for the photocatalytic mineralization of the highly recalcitrant pollutant iopromide in pure and tap water. / Durán-Álvarez, J. C.; Hernández-Morales, V. A.; Rodríguez-Varela, M.; Guerrero-Araque, D.; Ramirez-Ortega, D.; Castillón, F.; Acevedo-Peña, P.; Zanella, R.

In: Catalysis Today, 01.01.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Ag2O/TiO2 nanostructures for the photocatalytic mineralization of the highly recalcitrant pollutant iopromide in pure and tap water

AU - Durán-Álvarez, J. C.

AU - Hernández-Morales, V. A.

AU - Rodríguez-Varela, M.

AU - Guerrero-Araque, D.

AU - Ramirez-Ortega, D.

AU - Castillón, F.

AU - Acevedo-Peña, P.

AU - Zanella, R.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - © 2019 Elsevier B.V. TiO2 was modified by the deposition of Ag2O nanoparticles to increase the photocatalytic degradation of iopromide in water under UV–C (λ = 254 nm) and UV–A/visible light irradiation (380–800 nm) using pure and tap water. Several loadings of Ag2O were deposited on TiO2, namely 0.03, 0.15, 0.25, 0.65, 1.0, 1.15, 1.35 and 1.8 wt. %. XRD, TEM, BET, ICP-OES, XPS, DRS and cathodoluminescence spectroscopy were carried out to characterize the materials, while semiconducting properties of the composite were elucidated through electrochemical and photoelectrochemical characterization. Under UV–C light irradiation, the Ag2O/TiO2 heterostructures showed higher mineralization of iopromide (up to 86%, using the 1.15 wt. % Ag2O/TiO2 material) than unmodified materials (37% for TiO2 and 14% for Ag2O), indicating a synergistic effect by the combination of both compounds in the composite. Under UV–A/visible light irradiation, mineralization achieved with the 1.15 wt. % Ag2O/TiO2 material decreased up to 65%, which was again higher than that obtained for its single components. Stability of the photocatalyst was observed through three consecutive reaction cycles under UV–A/visible light irradiation. In tap water, environmentally relevant concentrations of iopromide were tested (Co = 50 μg L−1), resulting in a high degradation rate, while mineralization dramatically decreased because of the matrix effect. Some by-products were identified by mass spectroscopy and a possible degradation path was proposed. The outstanding photocatalytic activity of the Ag2O/TiO2 materials was explained by the electron trap effect exerted by Ag2O, along with the appearance of different silver species (Ag2O, Ag2O2 and Ag°) throughout the photocatalytic reaction, enhancing the mobility of the charge carriers and thus the generation of reactive species on the photocatalyst surface.

AB - © 2019 Elsevier B.V. TiO2 was modified by the deposition of Ag2O nanoparticles to increase the photocatalytic degradation of iopromide in water under UV–C (λ = 254 nm) and UV–A/visible light irradiation (380–800 nm) using pure and tap water. Several loadings of Ag2O were deposited on TiO2, namely 0.03, 0.15, 0.25, 0.65, 1.0, 1.15, 1.35 and 1.8 wt. %. XRD, TEM, BET, ICP-OES, XPS, DRS and cathodoluminescence spectroscopy were carried out to characterize the materials, while semiconducting properties of the composite were elucidated through electrochemical and photoelectrochemical characterization. Under UV–C light irradiation, the Ag2O/TiO2 heterostructures showed higher mineralization of iopromide (up to 86%, using the 1.15 wt. % Ag2O/TiO2 material) than unmodified materials (37% for TiO2 and 14% for Ag2O), indicating a synergistic effect by the combination of both compounds in the composite. Under UV–A/visible light irradiation, mineralization achieved with the 1.15 wt. % Ag2O/TiO2 material decreased up to 65%, which was again higher than that obtained for its single components. Stability of the photocatalyst was observed through three consecutive reaction cycles under UV–A/visible light irradiation. In tap water, environmentally relevant concentrations of iopromide were tested (Co = 50 μg L−1), resulting in a high degradation rate, while mineralization dramatically decreased because of the matrix effect. Some by-products were identified by mass spectroscopy and a possible degradation path was proposed. The outstanding photocatalytic activity of the Ag2O/TiO2 materials was explained by the electron trap effect exerted by Ag2O, along with the appearance of different silver species (Ag2O, Ag2O2 and Ag°) throughout the photocatalytic reaction, enhancing the mobility of the charge carriers and thus the generation of reactive species on the photocatalyst surface.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85059831693&origin=inward

UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85059831693&origin=inward

U2 - 10.1016/j.cattod.2019.01.027

DO - 10.1016/j.cattod.2019.01.027

M3 - Article

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

ER -