Issue 9, 2019

Visible light to switch-on desorption from goethite


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.

Graphical abstract: Visible light to switch-on desorption from goethite

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Article information

Article type
26 Nov 2018
06 Feb 2019
First published
06 Feb 2019
This article is Open Access
Creative Commons BY license

Nanoscale, 2019,11, 3794-3798

Visible light to switch-on desorption from goethite

A. Šutka, M. Järvekülg, K. A. Gross, M. Kook, T. Käämbre, M. Visnapuu, G. Trefalt and A. Šutka, Nanoscale, 2019, 11, 3794 DOI: 10.1039/C8NR09547G

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