Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 28, Pages 13887-13893Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp2046596
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Funding
- Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division of the U.S. Department of Energy [DEAC02-05CH11231]
- NSF Science and Technology Center of Advanced Materials for Purification of Water with Systems [CTS-0120978]
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Sum frequency vibrational spectroscopy was used to study the structure of water/alpha-Al2O3 (1 (1) over bar 02) interfaces at different pH values. The OH stretch spectra are dominated by interfacial water contributions at lower frequencies and by bonded hydroxyls on the Al2O3 surface at higher frequencies. Protonation and deprotonation of various oxide functional groups at the alpha-Al2O3 surface as pH varies can be monitored quantitatively by changes of the spectrum, allowing extraction of their pK reaction values. The point of zero charge of the interface is found to be at pH similar to 6.7.
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