An Investigation into the Stability of Graphitic C3N4 as a Photocatalyst for CO2 Reduction

Francesca Pomilla, Maria Ana Cortes, Jeremy Hamilton, Raffaele Molinari, Guiseppe Barbieri, Guiseppe Marci, Leonardo Palmisano, Preetam Sharma, Alan Brown, John Byrne

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2 Citations (Scopus)

Abstract

The increasing CO2 concentration in the atmosphere exerts a significant influence on global warming and climate change. The capture and utilization of CO2 by conversion to useful products is an area of active research. In this work, the photo-driven reduction of CO2 was investigated using graphitic carbon nitride (g-C3N4) as a potential photocatalyst. The photocatalytic reduction of CO2 was investigated with g-C3N4 powder immobilized on a glass support in a batch gas phase photoreactor. The experiments were carried out under UV-Vis irradiation at 70°C and an initial pressure of 2.5 bar. The only gas phase product detected during the irradiation of the g-C3N4 in the presence of CO2 was CO, and the rate of production was observed to decrease over time. Oxygen doped g-C3N4 was also tested for CO2 reduction but had lower efficiency that the parent g-C3N4. Repeated cycles of photocatalytic CO2 reduction showed a decline in the activity of the g-C3N4. In the absence of CO2 some CO generation was also observed. Characterization of used and unused materials, using FTIR and XPS, showed an increase in the oxygen functional groups following UV-Vis irradiation or thermal treatment. While others report the use of g-C3N4 as a photocatalyst, this work highlights the important need for replicates and control testing to determine material stability.
LanguageEnglish
Pages28727-28738
Number of pages12
JournalJournal Of Physical Chemistry C
Volume122
Issue number50
Early online date27 Nov 2018
DOIs
Publication statusPublished - 20 Dec 2018

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Photocatalysts
Irradiation
Carbon Monoxide
Gases
Oxygen
Global warming
Climate change
Powders
Functional groups
X ray photoelectron spectroscopy
Heat treatment
Glass
Testing
Experiments

Cite this

Pomilla, Francesca ; Cortes, Maria Ana ; Hamilton, Jeremy ; Molinari, Raffaele ; Barbieri, Guiseppe ; Marci, Guiseppe ; Palmisano, Leonardo ; Sharma, Preetam ; Brown, Alan ; Byrne, John. / An Investigation into the Stability of Graphitic C3N4 as a Photocatalyst for CO2 Reduction. In: Journal Of Physical Chemistry C. 2018 ; Vol. 122, No. 50. pp. 28727-28738.
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An Investigation into the Stability of Graphitic C3N4 as a Photocatalyst for CO2 Reduction. / Pomilla, Francesca; Cortes, Maria Ana; Hamilton, Jeremy; Molinari, Raffaele; Barbieri, Guiseppe; Marci, Guiseppe; Palmisano, Leonardo; Sharma, Preetam; Brown, Alan; Byrne, John.

In: Journal Of Physical Chemistry C, Vol. 122, No. 50, 20.12.2018, p. 28727-28738.

Research output: Contribution to journalArticle

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AU - Pomilla, Francesca

AU - Cortes, Maria Ana

AU - Hamilton, Jeremy

AU - Molinari, Raffaele

AU - Barbieri, Guiseppe

AU - Marci, Guiseppe

AU - Palmisano, Leonardo

AU - Sharma, Preetam

AU - Brown, Alan

AU - Byrne, John

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AB - The increasing CO2 concentration in the atmosphere exerts a significant influence on global warming and climate change. The capture and utilization of CO2 by conversion to useful products is an area of active research. In this work, the photo-driven reduction of CO2 was investigated using graphitic carbon nitride (g-C3N4) as a potential photocatalyst. The photocatalytic reduction of CO2 was investigated with g-C3N4 powder immobilized on a glass support in a batch gas phase photoreactor. The experiments were carried out under UV-Vis irradiation at 70°C and an initial pressure of 2.5 bar. The only gas phase product detected during the irradiation of the g-C3N4 in the presence of CO2 was CO, and the rate of production was observed to decrease over time. Oxygen doped g-C3N4 was also tested for CO2 reduction but had lower efficiency that the parent g-C3N4. Repeated cycles of photocatalytic CO2 reduction showed a decline in the activity of the g-C3N4. In the absence of CO2 some CO generation was also observed. Characterization of used and unused materials, using FTIR and XPS, showed an increase in the oxygen functional groups following UV-Vis irradiation or thermal treatment. While others report the use of g-C3N4 as a photocatalyst, this work highlights the important need for replicates and control testing to determine material stability.

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