Self‐Induced and Progressive Photo‐Oxidation of Organophosphonic Acid Grafted Titanium Dioxide

Nick Gys, Bram Pawlak, Kristof Marcoen, Gunter Reekmans, Leticia F. Velasco, Rui An, Kenny Wyns, Kitty Baert, Kaimin Zhang, Leon Luntadila Lufungula, Alessandra Piras, Laurens Siemons, Bart Michielsen, Sabine Van Doorslaer, Frank Blockhuys, Tom Hauffman, Peter Adriaensens, Steven Mullens, Vera MEYNEN

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs


While synthesis-properties-performance correlations are being studied for organophosphonic acid grafted TiO2 , their stability and the impact of the exposure conditions on possible changes in the interfacial surface chemistry remain unexplored. Here, the impact of different ageing conditions on the evolution of the surface properties of propyl- and 3-aminopropylphosphonic acid grafted mesoporous TiO2 over a period of 2 years is reported, using solid-state 31 P and 13 C NMR, ToF-SIMS and EPR as main techniques. In humid conditions under ambient light exposure, PA grafted TiO2 surfaces initiate and facilitate photo-induced oxidative reactions, resulting in the formation of phosphate species and degradation of the grafted organic group with a loss of carbon content ranging from 40 to 60 wt %. By revealing its mechanism, solutions were provided to prevent degradation. This work provides valuable insights for the broad community in choosing optimal exposure/storage conditions that extend the lifetime and improve the materials' performance, positively impacting sustainability.
langue originaleAnglais
Numéro d'articlee202200441
Numéro de publication3
Les DOIs
Etat de la publicationPublié - 10 mars 2023

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