Issue 38, 2022

Nanoceria dissolution at acidic pH by breaking off the catalytic loop

Abstract

This manuscript proves the reproducibility and robustness of cerium oxide nanoparticles, nanoceria, employed as a chemical reagent with oxidizing capacity (as an electron sink) at acidic pH. Unlike nanoceria multi-enzyme-mimetic capabilities at neutral or high pH, nanoceria can behave as a stoichiometric reagent at low pH where insoluble Ce4+ ions transform into soluble Ce3+ in the nanocrystal that finally dissolves. This behaviour can be interpreted as enzyme-like when nanoceria is in excess with respect to the substrate. Under these conditions, the Ce3+/Ce4+ ratio in the NPs can easily be estimated by titration with ferrocyanide. This procedure could become a rapid assessment tool for evaluating nanoceria capacity in liquid environments.

Graphical abstract: Nanoceria dissolution at acidic pH by breaking off the catalytic loop

Supplementary files

Article information

Article type
Paper
Submitted
30 Jun 2022
Accepted
11 Aug 2022
First published
19 Aug 2022
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2022,14, 14223-14230

Nanoceria dissolution at acidic pH by breaking off the catalytic loop

D. Galyamin, L. M. Ernst, A. Fitó-Parera, G. Mira-Vidal, N. G. Bastús, N. Sabaté and V. Puntes, Nanoscale, 2022, 14, 14223 DOI: 10.1039/D2NR03586C

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