Abstract Crystallisation of amorphous TiO2 have been performed by two steps, the hydrothermal method and following heating in Ar at 450 °C or mild heating at 200 °C under vacuum. Both methods were successful in reducing the amount of OH groups on TiO2 surface, however heating at high temperature caused significant decrease of BET surface area and increase in mesoporosity of TiO2. Low hydroxylated surface of TiO2 caused, that acetaldehyde was adsorbed on its surface with chemical bounding and then could be decomposed via photocatalytic process. Although amount of acetaldehyde decomposed on TiO2 was comparable for both thermal heated samples, that than prepared at 200 °C under vacuum showed higher mineralisation degree and lower emission of formaldehyde from its surface. It appeared, that large pores present in sample heat treated at 450 °C favored diffusion of the formed byproducts from its surface and consequently lower mineralisation degree was obtained.

中文翻译：

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TiO2结构对乙醛气体完全分解的影响

摘要 无定形 TiO2 的结晶分两步进行，即水热法和随后在 450 °C 的 Ar 中加热或在真空下在 200 °C 温和加热。两种方法都成功地减少了 TiO2 表面上的 OH 基团的数量，但是在高温下加热会导致 BET 表面积显着降低并增加 TiO2 的介孔率。TiO2 的低羟基化表面导致乙醛以化学键吸附在其表面，然后可以通过光催化过程分解。尽管两种热加热样品在 TiO2 上分解的乙醛量相当，但与在 200°C 真空下制备的样品相比，其矿化度更高，甲醛从其表面的排放量更低。它出现，