Journal
CATALYSIS TODAY
Volume 340, Issue -, Pages 97-105Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2018.11.010
Keywords
Transient FTIR; Step-scan; graphitic carbon nitride; Photocatalysis; IR- blackening
Funding
- Israel Science Foundation [1819/14]
- British Council [278072873]
- Grand Technion Energy Program
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Transient FTIR measurements were performed on graphitic carbon nitride using a step-scan method, facilitating temporal resolution of a few nanoseconds. Variations in the location and the intensity of specific peaks and emerging of new peaks were observed during the first 170 nanoseconds after excitation. A comparison was made between graphitic carbon nitride prepared at two temperatures: 510 degrees C and 650 degrees C. The material prepared at 650 degrees C revealed very strong non-specific absorption beginning 35 nanoseconds after excitation and lasting for 20 nanoseconds. This phenomenon, termed IR-blackening was observed neither in g-C3N4 prepared at 510 degrees C nor in g-C3N4 prepared at 650 degrees C that was exposed to hole scavengers (ethanol and benzyl alcohol). In contrast, exposure of material prepared at 650 degrees C to an electron scavenger (methyl viologen) hardly alter the IR-blackening phenomenon. The results were explained by a mechanism, predicting higher reductive activity for materials having imperfect heptazine polymerization, as indeed was found in the photocatalytic degradation of 4-nitrophenol.
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