Publication
Title
Understanding surface (un)reactive sites of titania supports towards propyl-phosphonic acid surface modification
Author
Abstract
Organophosphonic acids (PAs) surface modification on metal oxides is important for applications, nevertheless, a detailed study evaluating the influence of metal oxides surface properties on PAs modification is lacking. This work presents a method to qualitatively probe surface (un)reactive sites of titania towards propyl-phosphonic acid (3PA) grafting by methanol. It identifies the more or less reactive sites, i.e., hydroxyl groups and Lewis acid sites, allowing to understand relative differences in maximum modification degrees of 3PA among different titania supports. Therefore, three different types of titania were used, while all other 3PA modification conditions were kept constant. A clear difference in the maximum modification degree on the three titania supports was observed. In-situ diffuse reflectance Fourier transform infrared spectroscopy revealed that not all surface OH groups had reacted with 3PA at the highest modification degree, which were similar to most of the OH groups remaining after methanol chemisorption. Also the adsorption capacities of the strongly bonded chemisorbed methanol elucidated differences in the three titania, which was related to the maximum modification degree of 3PA. Methanol chemisorption can thus aid in the understanding of the kinds of reactive surface sites that play a role in the divergence of 3PA coverage on different types of titania supports.
Language
English
Source (journal)
Surfaces and interfaces. - Amsterdam, 2016, currens
Publication
Amsterdam : Elsevier , 2024
ISSN
2468-0230
DOI
10.1016/J.SURFIN.2023.103697
Volume/pages
44 (2024) , p. 1-10
Article Reference
103697
ISI
001139026700001
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Project info
EASiCHEM - Efficiƫnt Affinity Separations for Chemical Applications.
FWO sabbatsverlof 2020-2021 (Prof. Vera Meynen).
BOF Sabbatical 2021-2022 - Vera Meynen.
Versatile X-ray powder diffraction platform for materials science.
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Record
Identifier
Creation 02.12.2023
Last edited 01.02.2024
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