Reference : Easy stabilization of Evonik Aeroxide P25 colloidal suspension by 4- hydroxybenzoic a...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/264242
Easy stabilization of Evonik Aeroxide P25 colloidal suspension by 4- hydroxybenzoic acid functionalization
English
Mahy, Julien mailto [Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry >]
Douven, Sigrid []
Hollevoet, Jonas []
Body, Nathalie []
Haynes, Tommy []
Hermans, Sophie []
Lambert, Stéphanie mailto [Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry >]
Paez, Carlos []
Dec-2021
Surfaces and Interfaces
Elsevier
27
101501
Yes (verified by ORBi)
International
2468-0230
Amsterdam
Netherlands
[en] Evonik Aeroxide P25 ; 4-Hydroxybenzoic acid ; Grafting ; Colloid stability ; Photocatalysis
[en] A new functionalization method was developed with the aim of producing stable TiO2-based colloids starting from commercial Evonik Aeroxide P25 powder. The stability of P25 colloids was efficiently increased by grafting 4-hydroxybenzoic acid (4-HBA) on the P25 surface. Results highlighted that 4-HBA interacted with the surface of P25 through its carboxylic group.
The key parameter for an optimized stability is the 4-HBA/P25 ratio. If the amount of 4-HBA is too high compared to the TiO2 available surface, 4-HBA molecules preferentially interact with each other, therefore reducing their adsorption on P25.
Eight different amounts of 4-HBA were grafted on P25, producing stable colloids in both ethanol and water medium. In both media, the optimal properties and highest stability were obtained for a 4-HBA/TiO2 mass ratio equal to 0.333.
This optimal sample was further tested and compared to pure P25 (used as reference material) for p-nitrophenol (PNP) degradation under UV-visible light without any stirring to highlight the beneficial effect of the powder stability. The photocatalytic results showed that the grafted sample reached a degradation up to 8 times higher than pure P25. This functionalization method is easy to implement and stabilizes colloids starting from any pre-synthesized powder. This versatility widens the field of applications, and opens the door for further developments in areas such as coatings.
http://hdl.handle.net/2268/264242

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