Real-time observation of cation exchange kinetics and dynamics at the muscovite-water interface
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Illinois, Chicago, IL (United States)
- Univ. of Delaware, Newark, DE (United States)
Here, ion exchange at charged solid–liquid interfaces is central to a broad range of chemical and transport phenomena. Real-time observations of adsorption/desorption at the molecular-scale elucidate exchange reaction pathways. Here, we report temporal variation in the distribution of Rb+ species at the muscovite (001)–water interface during exchange with Na+. Time-resolved resonant anomalous X-ray reflectivity measurements reveal that Rb+ desorption occurs over several tens of seconds during which thermodynamically stable inner-sphere Rb+ slowly transforms to less stable outer-sphere Rb+ at 25°C. In contrast, Rb+ adsorption is about twice as fast, proceeding quickly from Rb+ in the bulk solution to the stable inner-sphere species. The Arrhenius plot of the adsorption/desorption rate constants measured from 9 to 55°C shows that the pre-exponential factor for desorption is significantly smaller than for adsorption, indicating that this reduced attempt frequency of cation detachment largely explains the slow cation exchange processes at the interface.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1363898
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Vol. 8; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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