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231223s2004 xx ||||| 00| ||eng c |
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|a eng
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|a Johnson, Stephen B
|e verfasserin
|4 aut
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|a Adsorption of organic matter at mineral/water interfaces. 2. Outer-sphere adsorption of maleate and implications for dissolution processes
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|c 2004
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 22.05.2006
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|a Date Revised 26.10.2019
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|a published: Print
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|a Citation Status MEDLINE
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|a The effects of the adsorption of a simple dicarboxylate low molecular weight organic anion, maleate, on the dissolution of a model aluminum oxide, corundum (alpha-Al2O3), have been examined over a range of different maleate concentrations (0.125-5.0 mM) and pH conditions (2-10). In situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopic measurements indicate that maleate binds predominantly as an outer-sphere, fully deprotonated complex ([triple bond]AlOH2+ -Mal2-) at the corundum surface over the entire range of maleate concentrations and pH conditions investigated. In accordance with the ATR-FTIR findings, macroscopic adsorption data can be modeled as a function of maleate concentration and pH using an extended constant capacitance approach and a single [triple bond]AlOH2+ -Mal2- species. Outer-sphere adsorption of maleate is found to significantly reduce the protolytic dissolution rate of corundum under acidic conditions (pH < 5). A likely mechanism involves steric protection of dissolution-active surface sites, whereby strong outer-sphere interactions with maleate hinder attack on those surface sites by dissolution-promoting species
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|a Journal Article
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Maleates
|2 NLM
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|a Water
|2 NLM
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|a 059QF0KO0R
|2 NLM
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|a maleic acid
|2 NLM
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|a 91XW058U2C
|2 NLM
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|a Aluminum Oxide
|2 NLM
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|a LMI26O6933
|2 NLM
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| 700 |
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|a Yoon, Tae Hyun
|e verfasserin
|4 aut
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|a Kocar, Benjamin D
|e verfasserin
|4 aut
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| 700 |
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|a Brown, Gordon E
|c Jr
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 20(2004), 12 vom: 08. Juni, Seite 4996-5006
|w (DE-627)NLM098181009
|x 0743-7463
|7 nnns
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|g volume:20
|g year:2004
|g number:12
|g day:08
|g month:06
|g pages:4996-5006
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