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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Quantitative Detection of OH Radicals for Investigating the Reaction Mechanism of Various Visible-Light TiO2 Photocatalysts in Aqueous Suspension
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Quantitative Detection of OH Radicals for Investigating the Reaction Mechanism of Various Visible-Light TiO2 Photocatalysts in Aqueous Suspension

机译：OH自由基的定量检测以研究水性悬浮液中各种可见光TiO2光催化剂的反应机理

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摘要

The reaction mechanism of visible-light responsive photocatalysts was explored by analyzing OH radicals (·OH) quantitatively by means of a coumarin fluorescence probe method. The photocatalysts investigated were various modified TiO2, i.e., nitrogen-doped, Pt-complex-deposited, Fe (III)-grafted, and Fe (III)-grafted Ru-doped TiO2. The formation rate of ·OH was measured to calculate the ·OH quantum yield from the absorbed intensity of 470 nm LED light. The highest quantum yield was obtained for Fe (III)-grafted Ru-doped TiO2. The ·OH yield was increased on the addition of H2O2 for the Fe(III)-grafted TiO2 indicating that H2O2 is supposedly a reaction intermediate for producing ·OH. The photocatalytic activity for each sample was obtained by measuring CO2 generation rate on the acetaldehyde decomposition in an aqueous suspension system and then it was compared with the ·OH formation rate. Although the CO2 generation rate is positively correlated with the ·OH formation rate for each photocatalyst, the values of CO2 generation were extremely larger than those of ·OH. This finding indicates that the oxidation reaction takes place dominantly with surface trapped holes which probably exchange with the ·OH in solution.
机译：通过香豆素荧光探针法定量分析OH自由基（·OH），探索了可见光响应型光催化剂的反应机理。研究的光催化剂是各种改性的TiO2，即氮掺杂，Pt络合物沉积，Fe（III）接枝和Fe（III）接枝Ru掺杂的TiO2。测量·OH的形成速率，以从470nm LED光的吸收强度计算·OH量子产率。 Fe（III）接枝的Ru掺杂TiO2的量子产率最高。添加Fe（III）接枝的TiO2的H2O2可以提高·OH的收率，这表明H2O2可能是产生·OH的反应中间体。通过测量在水悬浮体系中乙醛分解时的CO2生成速率，获得每个样品的光催化活性，然后将其与·OH生成速率进行比较。尽管每种光催化剂的CO2生成速率与·OH生成速率均呈正相关，但CO2生成的值远大于·OH。这一发现表明，氧化反应主要发生在表面捕获的孔中，这些孔可能与溶液中的·OH交换。

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