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Observation of Distinct Surface AlIV Sites and Phosphonate Binding Modes in Gamma-Alumina and Concrete by High-Field 27Al and 31P MAS NMR.

机译：用高场27al和31p mas NmR观察γ-氧化铝和混凝土中不同的alIV表面和膦酸盐结合模式。

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High loadings of nerve agent-related phosphonic acids adsorbed on Al2O3 and concrete examined by 31P MAS NMR and high-field 27Al MAS NMR reveal the presence of several phosphonate-surface binding modes and greatly improved resolution of multiple AlIV sites. Some of the resolved AlIV sites are sensitive to surface hydroxylation/dehydroxylation are attributed to surface AlIV-OH groups (apparently having been observed for the first time). Although the number of surface AlIV sites detected by high-field 27Al MAS NMR (three) is in agreement with current surface models, their dehydroxylation behavior does not entirely concur with proposed dehydroxylation mechanisms. The various phosphonate-alumina surface species detected by 31P MAS NMR are consistent with those previously observed by IR techniques. In concrete, the formation of an aluminophosphonate species is directly observed, consistent with the recalcitrant extraction behavior exhibited by adsorbed phosphonates in environmental matrices.

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作者
G. W. Wagner R. A. Fry;
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年度 2009
页码 1-10
总页数 10
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Adsorption; Aluminates; Concrete; Decontamination; Nerve agents; Phosphonates;

机译：吸附;铝酸盐;混凝土;去污;神经毒剂;膦酸盐;

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1. Observation of Distinct Surface Al_(IV) Sites and Phosphonate Binding Modes in γ-Alumina and Concrete by High-Field ~(27)Al and ~(31)P MAS NMR [J] . George W. Wagner, Roderick A. Fry The journal of physical chemistry, C. Nanomaterials and interfaces . 2009,第30期

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Observation of Distinct Surface AlIV Sites and Phosphonate Binding Modes in Gamma-Alumina and Concrete by High-Field 27Al and 31P MAS NMR.

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