Issue 32, 2017

Two-step adsorption kinetics of malachite green on anionic polystyrene microspheres in aqueous solution probed by second harmonic generation

Abstract

Adsorption of organic cations of malachite green (MG) on an anionic microsphere surface was monitored in real time using a surface-specific second-harmonic generation (SHG) technique. This adsorption was found to consist of two processes of different timescales for all MG concentrations, which has not been considered in previous SHG experiments. The two-step adsorption can be well explained by our suggested model, which consists of an initial fast electrostatic alignment of weakly bound MG followed by slow non-electrostatic adsorption of MG on the surface of a microsphere. This study shows the importance of kinetics measurements in providing full understanding of adsorption of charged molecules on colloid surfaces.

Graphical abstract: Two-step adsorption kinetics of malachite green on anionic polystyrene microspheres in aqueous solution probed by second harmonic generation

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2017
Accepted
27 Jul 2017
First published
08 Aug 2017

Phys. Chem. Chem. Phys., 2017,19, 21887-21892

Two-step adsorption kinetics of malachite green on anionic polystyrene microspheres in aqueous solution probed by second harmonic generation

J. H. Kim, Phys. Chem. Chem. Phys., 2017, 19, 21887 DOI: 10.1039/C7CP03088F

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