TY - JOUR
T1 - Effect of Acid on Surface Hydroxyl Groups on Kaolinite and Montmorillonite
AU - Sihvonen, Sarah K.
AU - Murphy, Kelly A.
AU - Washton, Nancy M.
AU - Altaf, Muhammad Bilal
AU - Mueller, Karl T.
AU - Freedman, Miriam Arak
N1 - Funding Information:
Acknowledgements: We acknowledge the Materials Characterization Lab run by the Materials Research Institute at Penn State for use of the PANanalytical Empyrean XRD. We thank L. Ortiz Rivera for performing BET measurements on the ASAP 2020 automated surface area and porosity system, and V. Bojan and G. Barber for performing the XPS experiments and helpful discussions. We also thank J. V. Badding for use of a centrifuge. A portion of the research was performed using EMSL, a DOE Office of Science User Facility sponsored by the Office of Biological and Environmental Research and located at the Pacific Northwest National Laboratory. M. B. A., S. K. S., and M. A. F. were funded by the Pennsylvania State University and by an NSF CAREER Award (CHE 1351383). K. A. M. and K. T. M. were funded by NSF CHE 1213451.
Publisher Copyright:
© 2018 Walter de Gruyter GmbH, Berlin/Boston 2018.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2018/3/28
Y1 - 2018/3/28
N2 - Mineral dust aerosol participates in heterogeneous chemistry in the atmosphere. In particular, the hydroxyl groups on the surface of aluminosilicate clay minerals are important for heterogeneous atmospheric processes. These functional groups may be altered by acidic processing during atmospheric transport. In this study, we exposed kaolinite (KGa-1b) and montmorillonite (STx-1b) to aqueous sulfuric acid and then rinsed the soluble reactants and products off in order to explore changes to functional groups on the mineral surface. To quantify the changes due to acid treatment of edge hydroxyl groups, we use 19F magic angle spinning nuclear magnetic resonance spectroscopy and a probe molecule, 3,3,3-trifluoropropyldimethylchlorosilane. We find that the edge hydroxyl groups (OH) increase in both number and density with acid treatment. Chemical reactions in the atmosphere may be impacted by the increase in OH at the mineral edge.
AB - Mineral dust aerosol participates in heterogeneous chemistry in the atmosphere. In particular, the hydroxyl groups on the surface of aluminosilicate clay minerals are important for heterogeneous atmospheric processes. These functional groups may be altered by acidic processing during atmospheric transport. In this study, we exposed kaolinite (KGa-1b) and montmorillonite (STx-1b) to aqueous sulfuric acid and then rinsed the soluble reactants and products off in order to explore changes to functional groups on the mineral surface. To quantify the changes due to acid treatment of edge hydroxyl groups, we use 19F magic angle spinning nuclear magnetic resonance spectroscopy and a probe molecule, 3,3,3-trifluoropropyldimethylchlorosilane. We find that the edge hydroxyl groups (OH) increase in both number and density with acid treatment. Chemical reactions in the atmosphere may be impacted by the increase in OH at the mineral edge.
UR - http://www.scopus.com/inward/record.url?scp=85039067050&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85039067050&partnerID=8YFLogxK
U2 - 10.1515/zpch-2016-0958
DO - 10.1515/zpch-2016-0958
M3 - Article
AN - SCOPUS:85039067050
VL - 232
SP - 409
EP - 430
JO - Zeitschrift fur Physikalische Chemie
JF - Zeitschrift fur Physikalische Chemie
SN - 0942-9352
IS - 3
ER -