The behavior of the zeolite laumontite during dissolution in acidic aqueous solutions has been studied by fluid-cell atomic force microscopy, with a focus on the role of the framework Al atoms in controlling the dissolution mechanisms. Isothermal single etch pits dissolution rates have been measured in situ at three different temperatures (11, 23, and 40 degrees C) on the (110) surface, and at one temperature (22 degrees C) on ((2) over bar 01). The experimentally derived apparent activation energy of the development of the etch pits (E = 11.9 +/- 4 kJ/mol) on the (110) surface and their morphology can be interpreted considering the structural features of laumontite, especially the crystallochemical distribution of the Al atoms in the framework. Preliminary comparison of the dissolution features of laumontite with those measured on zeolites with different Si/Al ratios and Al distribution further confirm the controlling role of the structural Al in the dissolution process.

The dissolution of laumontite in acidic aqueous solutions: A controlled-temperature in situ atomic force microscopy study / M. Voltolini, G. Artioli, M. Moret. - In: AMERICAN MINERALOGIST. - ISSN 0003-004X. - 97:1(2012 Jan), pp. 150-158. [10.2138/am.2012.3837]

The dissolution of laumontite in acidic aqueous solutions: A controlled-temperature in situ atomic force microscopy study

M. Voltolini
Primo
;
G. Artioli
Secondo
;
2012-01

Abstract

The behavior of the zeolite laumontite during dissolution in acidic aqueous solutions has been studied by fluid-cell atomic force microscopy, with a focus on the role of the framework Al atoms in controlling the dissolution mechanisms. Isothermal single etch pits dissolution rates have been measured in situ at three different temperatures (11, 23, and 40 degrees C) on the (110) surface, and at one temperature (22 degrees C) on ((2) over bar 01). The experimentally derived apparent activation energy of the development of the etch pits (E = 11.9 +/- 4 kJ/mol) on the (110) surface and their morphology can be interpreted considering the structural features of laumontite, especially the crystallochemical distribution of the Al atoms in the framework. Preliminary comparison of the dissolution features of laumontite with those measured on zeolites with different Si/Al ratios and Al distribution further confirm the controlling role of the structural Al in the dissolution process.
Dissolution process; Etch pit; In situ AFM; Laumontite; Mineral surfaces;
Settore GEO/06 - Mineralogia
Settore GEO/08 - Geochimica e Vulcanologia
Article (author)
File in questo prodotto:
File Dimensione Formato  
10.2138_am.2012.3837.pdf

solo utenti autorizzati

Tipologia: Publisher's version/PDF
Dimensione 3.45 MB
Formato Adobe PDF
3.45 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/908549
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact