Investigation of CO 2 capture and photoreduction mechanisms in IEF-11 based metal organic frameworks Vanessa Hui Yin Chou , Camille Petit Department of Chemical Engineering, Imperial College London, United Kingdom Email: v.chou24@imperial.ac.uk, camille.petit@imperial.ac.uk Carbon dioxide (CO 2 ) emissions significantly contribute to global warming. To address this, carbon capture and utilisation technologies such as CO 2 adsorption and photocatalytic reduction offer promising solutions.1-2 In this regard, functional porous metal organic frameworks (MOFs) have a role to play. IEF-11 is an emerging Ti-based MOF that exhibits accessible porosity and photocatalytic properties due to fast Ti-O-Ti charge transfer and narrow bandgap (Eg) of 2.47 eV.3 However, little has been done to optimise the photocatalytic performance of IEF-11 and take advantage of its structural, chemical, and optoelectronic features. In this work, we aim to enhance the CO 2 uptake and photocatalytic capabilities of IEF-11 through amine functionalisation. Characterisation techniques such as powder X-ray diffraction and X-ray photoelectron spectroscopy revealed how different amount of glycine molecules were successfully incorporated into IEF-11 and their influence on its structural and chemical properties. Glycine functionalisation increased the BET area and CO2 uptake of IEF-11 by 23 % and 55 %, respectively (up to 407 m2/g and 0.9 mmol/g (1 bar, 298 K)), while maintaining visible light absorbance edge at 625 nm (Eg ~2.25 eV). We anticipate that these features will enhance its photocatalytic capability. This study will advance the development of high-performance MOF-based photocatalysts. References 1. Navarro-Jaén, S. et al. Highlights and challenges in the selective reduction of carbon dioxide to methanol. Nat Rev Chem 5, 564 (2021). 2. Fang, S. et al. Photocatalytic CO2 reduction. Nat Rev Methods Primers 3, 61 (2023). 3. Salcedo-Abraira, P. et al. A Novel Porous Ti-Squarate as Efficient Photocatalyst in the Overall Water Splitting Reaction under Simulated Sunlight Irradiation. Adv Mat 33, 2106627 (2021).
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