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, Léon Luntadila Lufungula, Alessandra Piras, Laurens Siemons, Bart Michielsen, Sabine Van Doorslaer, Frank Blockhuys, Tom Hauffman, Peter Adriaensens, Steven Mullens, Vera Meynen

Onderzoeksoutput: Bijdrage aan een tijdschriftArtikelpeer review

Samenvatting

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 31P and 13C 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.

Originele taal-2Engels
Artikelnummere202200441
TijdschriftChemPlusChem
Volume88
Nummer van het tijdschrift3
DOI's
StatusGepubliceerd - mrt. 2023

Vingerafdruk

Duik in de onderzoeksthema's van 'Self-Induced and Progressive Photo-Oxidation of Organophosphonic Acid Grafted Titanium Dioxide'. Samen vormen ze een unieke vingerafdruk.

Citeer dit