10.1021/acs.jpcc.8b09237.s001
Francesca
R. Pomilla
Francesca
R.
Pomilla
Maria A. L. R.
M. Cortes
Maria A. L. R.
M.
Cortes
Jeremy W. J. Hamilton
Jeremy W. J.
Hamilton
Raffaele Molinari
Raffaele
Molinari
Giuseppe Barbieri
Giuseppe
Barbieri
Giuseppe Marcì
Giuseppe
Marcì
Leonardo Palmisano
Leonardo
Palmisano
Preetam K. Sharma
Preetam K.
Sharma
Alan Brown
Alan
Brown
John A. Byrne
John A.
Byrne
An Investigation into the Stability of Graphitic C<sub>3</sub>N<sub>4</sub> as a Photocatalyst for CO<sub>2</sub> Reduction
American Chemical Society
2018
CO 2 concentration
CO 2 reduction
graphitic carbon nitride
Graphitic C 3 N 4
XPS
photocatalytic CO 2 reduction
CO 2
UV
g-C 3 N 4 powder
FTIR
CO 2 Reduction
batch gas-phase photoreactor
Oxygen-doped g-C 3 N 4
g-C 3 N 4
parent g-C 3 N 4
2018-11-27 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/An_Investigation_into_the_Stability_of_Graphitic_C_sub_3_sub_N_sub_4_sub_as_a_Photocatalyst_for_CO_sub_2_sub_Reduction/7445483
The
increasing CO<sub>2</sub> concentration in the atmosphere exerts
a significant influence on global warming and climate change. The
capture and utilization of CO<sub>2</sub> by conversion to useful
products is an area of active research. In this work, the photodriven
reduction of CO<sub>2</sub> was investigated using graphitic carbon
nitride (g-C<sub>3</sub>N<sub>4</sub>) as a potential photocatalyst.
The photocatalytic reduction of CO<sub>2</sub> was investigated with
g-C<sub>3</sub>N<sub>4</sub> 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-C<sub>3</sub>N<sub>4</sub> in the presence of CO<sub>2</sub> was CO, and the rate of production was observed to decrease over
time. Oxygen-doped g-C<sub>3</sub>N<sub>4</sub> was also tested for
CO<sub>2</sub> reduction but had efficiency lower than that of the
parent g-C<sub>3</sub>N<sub>4</sub>. Repeated cycles of photocatalytic
CO<sub>2</sub> reduction showed a decline in the activity of the g-C<sub>3</sub>N<sub>4</sub>. In the absence of CO<sub>2</sub> 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-C<sub>3</sub>N<sub>4</sub> as a photocatalyst,
this work highlights the important need for replicates and control
testing to determine material stability.