Graphitic carbon nitride photocatalysis: the hydroperoxyl radical role revealed by kinetic modelling

Abstract

Metal-free graphitic carbon nitride (GCN) is an optical semiconductor with the advantage of in situ H2O2 generation parallel to pollutant removal. The photocatalytic degradation mechanism using GCN is attributed to a series of reactions with reactive oxygen species and photogenerated holes. However, the role of each species in the photocatalytic process kinetics remains a challenge. This work provides novel photodegradation kinetic data through a modelling approach using the Kintecus software for the first time in heterogeneous photocatalytic reactions. The results were validated by double fitting of simultaneous phenol removal and H2O2 formation. The role of dissolved oxygen and intermediate products are also investigated. Sophisticated techniques, as photoacoustic spectroscopy for energy-resolved distribution of electron traps and diffuse reflectance spectroscopy for determination of band energies, aid to clarify the behaviour of GCN. This paper identifies the oxidation routes contributors and carefully describes the GCN photocatalytic simultaneous phenol degradation and H2O2 generation.

Graphical abstract: Graphitic carbon nitride photocatalysis: the hydroperoxyl radical role revealed by kinetic modelling

Supplementary files

Article information

Article type
Paper
Submitted
11 Sep 2021
Accepted
21 Oct 2021
First published
21 Oct 2021
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2021, Advance Article

Graphitic carbon nitride photocatalysis: the hydroperoxyl radical role revealed by kinetic modelling

I. Velo-Gala, A. Torres-Pinto, C. G. Silva, B. Ohtani, A. M. T. Silva and J. L. Faria, Catal. Sci. Technol., 2021, Advance Article , DOI: 10.1039/D1CY01657A

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