ORCID
- Giuliano M. Laudone: 0000-0001-6966-1163
- Andrew Turner: 0000-0003-0505-4561
Abstract
Microporous ‘functionalised’ calcium carbonate (FCC) has potential for use as a carrier for the controlled release of ‘actives’, by permeation and diffusion. We have investigated the nature of the FCC surface and the mechanism of adsorption of two typical actives, namely the anti-inflammatory drug aspirin and the flavour compound vanillin, from chloroform and aqueous ethanolic solutions. There is indirect evidence from the quantitative perturbation of Tóth isotherms that their adsorption is hindered by a stagnant diffusion layer of water trapped in the micro-porosity of the FCC. To complement previous studies of the surface of FCC, it was also tested with the cationic probe benzyltrimethylammonium bromide and the anionic probe sodium 2-naphthalenesulphonate. Experimental procedures were validated by comparison with adsorption onto ground calcium carbonate and high surface area talc.
Publication Date
2017-04-21
Publication Title
Adsorption
Volume
23
ISSN
0929-5607
Embargo Period
2018-04-21
First Page
603
Last Page
612
Recommended Citation
Matthews, G., Levy, C., Laudone, G., Beckett, S., Turner, A., Schoelkopf, J., & Gane, P. (2017) 'Mechanism of adsorption of actives onto microporous functionalised calcium carbonate (FCC)', Adsorption, 23, pp. 603-612. Available at: 10.1007/s10450-017-9880-7
