没食子酸在二氧化钛上的吸附：光谱学研究。
Adsorption of caffeic acid on titanium dioxide: a spectroscopic study.
机构信息
Laboratory of Environmental Physical Chemistry, Department of Chemistry, CCE, Londrina State University, Londrina, PR, Brazil.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Jun 15;92:16-20. doi: 10.1016/j.saa.2012.02.046. Epub 2012 Feb 20.
Caffeic acid is an ortho-phenol found in vegetable tissues presenting important properties such as carcinogenesis inhibitor, anti-oxidant, anti-viral, anti-inflammatory and anti-rheumatic actions. It was observed that caffeic acid was not degraded in daylight during the adsorption on TiO(2) at pH 4.8. The adsorption fit very well to a Brunauer-Emmett-Teller isotherm equation with a monolayer coverage of 68.15 mg(CA)g(-1)(TiO2 and saturation coverage of 195.4 mg(CA)g(-1)(TiO2). A strong adsorption of caffeic acid was verified on TiO(2) for the dry solid obtained from the mixture. The Raman and IR spectroscopies revealed that the adsorption should occur through the interaction of the diphenol oxygens with contribution of CC double bond of the acrylic group, however, the carboxylic acid group did not have participation in the adsorption.
没食子酸是一种在植物组织中发现的邻苯二酚，具有重要的特性，如致癌抑制剂、抗氧化剂、抗病毒、抗炎和抗风湿作用。在 pH 值为 4.8 时，TiO2 上的吸附过程中，没食子酸在日光下不会发生降解。吸附非常符合 Brunauer-Emmett-Teller 等温方程，单层覆盖度为 68.15mg（CA）g（-1）（TiO2），饱和覆盖度为 195.4mg（CA）g（-1）（TiO2）。从混合物中获得的干燥固体表明 TiO2 对没食子酸具有很强的吸附性。拉曼和红外光谱表明，吸附应该通过二酚氧基的相互作用发生，其中丙烯酸基团的 CC 双键有贡献，但羧酸基团没有参与吸附。
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