Investigating the effect of graphene oxide on the photocatalytic efficiency of Bi-BiOBr and P25 TiO 2 composites for NOx removal Paransa Alimard 1,2,3 , Andreas Kafizas 1,3 1 Imperial College London, Department of Chemistry, Molecular Science Research Hub, White City Campus, 82 Wood Lane, London, W12 0BZ, U.K., 2 Grantham Institute- Climate Change and the Environment, and the Science and Solutions for a Changing Planet Doctoral Training Partnership (DTP), Imperial College London South Kensington Campus, London, SW7 2AZ, U.K., 3 London Centre for Nanotechnology, Imperial College London, London SW7 2AZ, U.K P25 and BiOBr exhibit significant photocatalytic activity for nitrogen oxide (NOx = NO + NO2) removal [1, 2] . This study explores the effect of incorporating Bi-BiOBr, P25, and 1 wt.% graphene oxide (GO) on photocatalytic performance for NO x degradation. The Bi-BiOBr/P25/GO composite was synthesized using a one-pot solvothermal method. Its structural, morphological, and compositional properties, along with its photocatalytic efficiency, were analysed using various techniques, including SEM, HR-TEM, XRD, Raman spectroscopy, UV-vis spectroscopy, XPS, PL spectroscopy, DR-TAS, and NO x photocatalytic testing according to the ISO 22197-1:2016 standard. The Bi-BiOBr/P25/GO composite demonstrated superior NO x removal efficiency compared to its individual components. Under NO gas exposure, it achieved a NO x removal rate of 21.9%, surpassing P25 (8.7%), Bi-BiOBr (6.5%), and GO (0%). In NO2 reactions, it removed approximately 15% of NO x , outperforming P25 (~10%), Bi- BiOBr (~5%), and GO (0%). References 1. Alimard, P., Gong, C., Itskou, I., Kafizas, A. Achieving High Photocatalytic NO x Removal Activity Using a Bi/BiOBr/ TiO 2 Composite Photocatalyst. Chemosphere 368 (2024)143728. 2. Olaifa, O., Alimard, P., Itskou, I., Eisner, F., Petit, C., Diez-Gonzalez, S., Kafizas, A., Purifying the Air with Photocatalysis: Developing Bismuth Oxybromide/Copper Phthalocyanine Composite Photocatalyst Filters with Enhanced Activity for NOx Removal. ChemPhotoChem,e202400346.
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