Effects of the Atmosphere in a Hydrothermal Process on the Morphology and Photocatalytic Activity of Cerium Oxide,ChemCatChem

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Effects of the Atmosphere in a Hydrothermal Process on the Morphology and Photocatalytic Activity of Cerium Oxide
ChemCatChem ( IF 3.8 ) Pub Date : 2018-08-09 , DOI: 10.1002/cctc.201800659
Sàisài Yuán ₁ , Sixiao Liu ₁ , Qitao Zhang ₂ , Ming Zhang ₁ , Bin Xu ₁ , Teruhisa Ohno ₃

Affiliation

The hydrothermal method is widely applied in nanomaterials synthesis, and most of the influencing factors have already been taken into account. However, the effect of atmosphere in solution on the performance of nanomaterials has been underestimated for a long time. In this article, reaction solvents were saturated with three classical gases (argon, oxygen, and carbon dioxide), and then heated at 180 °C for 24 h to obtain the cerium dioxide (CeO₂) nanoparticles. The properties of the three types of CeO₂ are significantly different from that of the normal CeO₂ (without gas saturation). The morphologies of the prepared CeO₂ particles are different, even appear the hollow structure in CeO₂−CO₂ (synthesized in CO₂ saturated condition). The more absorbing and meaningful thing is that the photocatalytic activity of CeO₂−CO₂ has been greatly improved. The concordance of the CO₂ atmosphere (acid gas) and CeO₂ (owning substantial content of basic sites) is the key point for the excellent photocatalytic performance.

中文翻译：

水热过程中的气氛对氧化铈的形态和光催化活性的影响

水热法广泛应用于纳米材料的合成中，并且已经考虑了大多数影响因素。然而，长期以来低估了溶液中的气氛对纳米材料性能的影响。在本文中，将反应溶剂用三种经典气体（氩气，氧气和二氧化碳）饱和，然后在180°C下加热24 h，以获得二氧化铈（CeO ₂）纳米颗粒。三种类型的CeO ₂的性能与正常CeO ₂的性能显着不同（无气体饱和）。制备的CeO ₂颗粒的形貌不同，甚至在CeO ₂ -CO _2中出现空心结构（在CO ₂饱和条件下合成）。更具有吸收性和意义的是，CeO ₂ -CO ₂的光催化活性得到了极大的提高。CO ₂气氛（酸性气体）和CeO ₂（具有大量碱性位点）的协调一致是优异光催化性能的关键。

更新日期：2018-08-09

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