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O: Fachverband Oberflächenphysik
O 21: Poster Heterogeneous Catalysis
O 21.5: Poster
Montag, 17. März 2025, 18:00–20:00, P2
Optimized BiVO4/g-C3N4 Heterojunctions for Efficient Photocatalytic Green Ammonia Production — •Susana D. Rojas1, Nicolás A. Soto1, Pablo E. Salinas1, Daniel Saavedra2, Marcelo A. Cisternas1, and Ulrich G. Volkmann2 — 1Escuela de Ingeniería Industrial, Universidad de Valparaíso, Santiago, Chile — 2Instituto de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
BiVO4 nanostructures were synthesized via a hydrothermal method, and g-C3N4 nanosheets by urea pyrolysis. The materials were characterized using Fourier transform IR spectroscopy (FTIR), UV-Vis and X-ray photoelectron spectroscopy, X-ray diffraction, and scanning electron microscopy to confirm their chemical and morphological structures. Photocatalytic ammonia production was evaluated in a cylindrical reactor with a Xenon discharge lamp, using an aqueous catalyst dispersion under magnetic stirring and a nitrogen flow at atmospheric pressure. Ammonia production was analyzed via the Nessler method with ammonium chloride (NH4Cl) calibration curves for the aqueous phase and in situ FTIR spectroscopy with a 16 m optical path gas cell for the gas phase [1, 2]. This work advances the understanding of photocatalytic processes for sustainable ammonia production and the development of efficient, eco-friendly methods for synthesizing this essential compound. Acknowledgements: ANID project SIA77210032 (SR, MC), UVA22991 (SR, MC), ANID Fellowship (DS), and Puente UC 2024-25 (UV). Ref.: [1] P. Huang, et al., Nature Comm. 13, 7908 (2022). [2] S.Z. Andersen, et al., Nature 570, 7762, 504-508 (2022).
Keywords: Photocatalytic Heterojunctions; Green Ammonia Production; Nanostructured Materials; Sustainable Energy Solutions; BiVO4/g-C3N4 Optimization