Easy stabilization of Evonik Aeroxide P25 colloidal suspension by 4- hydroxybenzoic acid functionalization

[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.

Disciplines :

Chemical engineering
Materials science & engineering

Author, co-author :

Mahy, Julien ; Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry

Douven, Sigrid

Hollevoet, Jonas

Body, Nathalie

Haynes, Tommy

Hermans, Sophie

Lambert, Stéphanie ; Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry

Paez, Carlos

Language :

English

Title :

Easy stabilization of Evonik Aeroxide P25 colloidal suspension by 4- hydroxybenzoic acid functionalization

Publication date :

December 2021

Journal title :

Surfaces and Interfaces

eISSN :

2468-0230

Publisher :

Elsevier, Amsterdam, Netherlands

Volume :

Pages :

101501

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 13 October 2021

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