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首页> 外文期刊>Catalysis science & technology >Photocatalytic reactions under irradiation of visible light over gold nanoparticles supported on titanium(IV) oxide powder prepared by using a multi-step photodeposition method
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Photocatalytic reactions under irradiation of visible light over gold nanoparticles supported on titanium(IV) oxide powder prepared by using a multi-step photodeposition method

机译：通过使用多步光沉积法制备的氧化钛（IV）氧化物粉末上支持的金纳米颗粒的可见光照射下的光催化反应

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摘要

Titanium(IV) oxide (TiO2) having both smaller and larger gold (Au) particles was successfully prepared by a multi-step (MS) photodeposition method. When 0.25 wt% Au loading per photodeposition was repeated four times, smaller and larger Au particles having average diameters of 1.4 and 13 nm, respectively, were fixed on TiO2, and the Au/TiO2 sample exhibited strong photoabsorption around 550 nm due to surface plasmon resonance (SPR) of the larger Au particles. Various Au/TiO2 samples were prepared by changing the Au loading per photodeposition and the number of photodepositions. Effects of the conditions in MS photodeposition and sample calcination on Au particle distribution and photoabsorption properties were investigated. These samples were used for hydrogen (H2) formation from 2-propanol and mineralization of acetic acid in aqueous suspensions under irradiation of visible light. In the case of H2 formation under deaerated conditions, the reaction rate of Au/TiO2 having both larger and smaller particles was 4 times higher than that of the Au/TiO2 sample without smaller Au particles, indicating that smaller Au particles acted effectively as a co-catalyst, that is, as reduction sites for H2 evolution. On the other hand, in the case of mineralization of acetic acid under aerated conditions, carbon dioxide formation rates were independent of the presence of smaller Au particles, indicating that the smaller Au particles had little effect on the mineralization of acetic acid. To extend the possibility of Au/TiO2 for H2 formation under irradiation of visible light, H2 formation from ammonia (NH3) as biomass waste was examined under deaerated conditions; NH3 was decomposed to H2 and nitrogen with a stoichiometric ratio of 3:1,
机译：具有多步（MS）光沉积法成功制备了具有较小金（AU）颗粒的钛（IV）氧化物（TIO2）。当重复每次光沉积0.25 wt％AU加载四次时，将平均直径分别为1.4和13 nm的较小和较大的Au颗粒固定在TiO2上，而AU/TIO2样品在550 nm附近表现出强烈的光吸附较大的AU颗粒的共振（SPR）。通过更改每个光沉积和光沉积的数量来制备各种AU/TIO2样品。研究了MS光沉积和样品钙化对AU颗粒分布和光吸收特性的影响。在可见光照射下，这些样品用于从2-丙醇和水性悬浮液中的乙酸矿化的氢（H2）形成。在脱氧条件下H2形成的情况下，具有较大和较小颗粒的AU/TIO2的反应速率比没有较小AU颗粒的AU/TIO2样品的4倍，表明较小的Au颗粒有效地作为CO作用 - 催化剂，即作为H2进化的还原位点。另一方面，在充气条件下乙酸矿化的情况下，二氧化碳的形成速率与较小的Au颗粒的存在无关，这表明较小的Au颗粒对乙酸的矿化几乎没有影响。为了扩展在可见光照射下H2形成的Au/TiO2形成的可能性，在脱氧条件下检查了氨（NH3）作为生物质废物的H2形成; NH3分解为H2和氮，化学计量比为3：1，

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