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Title: | Self-Induced and Progressive Photo-Oxidation of Organophosphonic Acid Grafted Titanium Dioxide | Authors: | Gys, Nick PAWLAK, Bram Marcoen, Kristof REEKMANS, Gunter Velasco, Leticia F. An, Rui Wyns, Kenny Baert, Kitty Zhang, Kaimin Lufungula, Leon Luntadila PIRAS, Alessandra Siemons, Laurens Michielsen, Bart VAN DOORSLAER, Sabine Blockhuys, Frank Hauffman, Tom ADRIAENSENS, Peter MULLENS, Steven Meynen, Vera |
Issue Date: | 2023 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | ChemPlusChem, 88 (3) (Art N° e202200441) | Abstract: | 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 P-31 and C-13 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. | Notes: | Meynen, V (corresponding author), Flemish Inst Technol Res VITO NV, Sustainable Mat, Boeretang 200, B-2400 Mol, Belgium. vera.meynen@uantwerpen.be |
Keywords: | ageing;organophosphonic acids;photo-oxidation;surface chemistry;titanium dioxide | Document URI: | http://hdl.handle.net/1942/39828 | ISSN: | 2192-6506 | e-ISSN: | 2192-6506 | DOI: | 10.1002/cplu.202200441 | ISI #: | 000947011200001 | Rights: | 2023 The Authors. ChemPlusChem published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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Self‐Induced and Progressive Photo‐Oxidation of Organophosphonic Acid Grafted Titanium Dioxide.pdf | Published version | 1.36 MB | Adobe PDF | View/Open |
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