Visible Light to Switch-on Desorption from Goethite

Nanoscale 2019
Anna Šutka, Martin Järvekülg, Kārlis-Agris Gross, Mati Kook, Tanel Käämbre, Meeri Visnapuu, Gregor Trefalt, Andris Šutka

Switching adsorption–desorption by visible light could provide the possibility for a wide range of applications that require controlled release-on-demand. Here, we demonstrate a visible-light controlled desorption behavior in aqueous suspensions for the first time. We observed cationic dye adsorption on amphoteric goethite α-FeOOH in the dark and release during visible light exposure at a pH value slightly over the isoelectric point of goethite. During this process, the dye does not degrade. Desorption is triggered by local heating due to light absorption in narrow band gap goethite, α-FeOOH.

Keywords
goethite nanowires, adsorption, desorption, visible light
DOI
10.1039/C8NR09547G
Hyperlink
https://pubs.rsc.org/en/content/articlelanding/2019/nr/c8nr09547g#!divAbstract

Šutka, A., Järvekülg, M., Gross, K., Kook, M., Käämbre, T., Visnapuu, M., Trefalt, G., Šutka, A. Visible Light to Switch-on Desorption from Goethite. Nanoscale, 2019, Vol. 11, No. 9, pp.3794-3798. ISSN 2040-3372. Available from: doi:10.1039/C8NR09547G

Publication language
English (en)