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首页> 外文期刊>New Journal of Chemistry >Degradation of palmitic (hexadecanoic) acid deposited on TiO2-coated self-cleaning glass: kinetics of disappearance, intermediate products and degradation pathways
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Degradation of palmitic (hexadecanoic) acid deposited on TiO2-coated self-cleaning glass: kinetics of disappearance, intermediate products and degradation pathways

机译：沉积在涂有TiO2的自清洁玻璃上的棕榈酸（十六烷酸）的降解：消失动力学，中间产物和降解途径

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Self-cleaning glass was prepared by depositing anatase nanoparticles as a transparent film onto glass previously coated by a barrier layer. A photoreactor was built to evaluate the efficiency. Palmitic acid, chosen as a compound representing stains from various sources and sprayed over these plates to form an uniform layer of ca. 580 nm thickness, was shown to disappear at a rate of ca. 60 nm h(-1) under UV irradiation corresponding to the average solar radiant power at midlatitude. That clearly demonstrated that this glass is efficient enough, at least with this type of grease stain, to implement its use. Our main efforts explored the identification of palmitic acid degradation products under these conditions by use of chromatographic methods, various solvents for recovering products on the glass, and various adsorbents (cartridges or SPME) for gas-phase analysis. The 39 products identified revealed the gradual splitting of the palmitic acid chain yielding the whole series of linear aldehydes and carboxylic acids, some alkanes and two alcohols. In the closed photoreactor, complete mineralization was achieved. When the photoreactor atmosphere was renewed every hour, formaldehyde, acetaldehyde and acetone reached the highest concentrations in the gas phase. Mechanisms involving the initial attack of palmitic acid either by photogenerated holes or by hydroxyl radicals with subsequent formation of alkylperoxy radicals, hydroperoxides and tetroxides are discussed to account for the products. [References: 31]
机译：通过将锐钛矿纳米颗粒作为透明膜沉积到预先由阻隔层涂覆的玻璃上来制备自清洁玻璃。建立了光反应器以评估效率。选择棕榈酸作为代表各种来源污渍的化合物，并将其喷洒在这些板上以形成均匀的ca层。厚度为580 nm的材料显示出消失的速率约为。在紫外线照射下60 nm h（-1）对应于中纬度的平均太阳辐射功率。这清楚地表明，这种玻璃至少在带有这种类型的油脂污渍的情况下足够有效地实现其使用。我们的主要工作是通过色谱方法，在玻璃上回收产物的各种溶剂以及用于气相分析的各种吸附剂（墨盒或SPME），探索在这些条件下鉴定棕榈酸降解产物的方法。鉴定出的39种产品表明棕榈酸链逐渐断裂，产生了一系列直链醛和羧酸，一些烷烃和两种醇。在封闭的光反应器中，实现了完全矿化。当光反应器气氛每小时更换一次时，甲醛，乙醛和丙酮在气相中达到最高浓度。讨论了涉及棕榈酸通过光生空穴或羟基自由基的初始攻击并随后形成烷基过氧自由基，氢过氧化物和四氧化物的机理。 [参考：31]

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