Photo-oxidation mechanism of L-alanine in TiO2 photocatalytic systems as studied by proton NMR spectroscopy
Photo-oxidation mechanism of L-alanine in TiO2 photocatalytic systems as studied by proton NMR spectroscopy
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DOI：
10.1016/j.cattod.2006.07.046
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发表时间：
2007-02-15
期刊：
影响因子：
5.3
通讯作者：
Nosaka, Yoshio
中科院分区：
文献类型：
--
作者：
Matsushita, Masami;Tran, Trung Huu;Nosaka, Yoshio
通过质子核磁共振波谱法对九种不同类型的 TiO2 粉末对作为代表性氨基酸的丙氨酸的光催化分解进行了详细研究。通过乙醛的脆弱中间体，乙酸被检测为稳定的主要中间体。在金红石表面形成丙酮酸，在锐钛矿表面检测到乙酰胺。丙酮酸直接由丙氨酸形成，而乙酰胺可能由丙氨酸的分解成分乙醛和氨产生。此外，还形成少量甲醛和甲酸并分解为CO2。 (c) 2006 Elsevier B.V. 保留所有权利。
Photocatalytic decomposition of alanine as a representative amino acid was investigated in detail for nine different kinds of TiO2 powders by proton NMR spectroscopy. Acetic acid was detected as a stable major intermediate via a fragile intermediate of acetaldehyde. Pyruvic acid was formed on rutile surface, while acetamide was detected on anatase surface. Pyruvic acid was formed directly from alanine, whereas acetamide was produced likely from acetaldehyde and ammonia, which are the decomposition components of alanine. In addition, small amount of formaldehyde and formic acid was formed and decomposing to CO2. (c) 2006 Elsevier B.V. All rights reserved.