Tryba Beata, Miądlicki Piotr, Rychtowski Piotr, Trzeciak Maciej, Wróbel Rafał Jan
Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland.
Materials (Basel). 2023 Jul 26;16(15):5241. doi: 10.3390/ma16155241.
Acetaldehyde decomposition was performed under heating at a temperature range of 25-125 °C and UV irradiation on TiO doped by metallic Ni powder and TiO supported on nickel foam. The process was carried out in a high-temperature reaction chamber, "The Praying Mantis", with simultaneous in situ FTIR measurements and UV irradiation. Ni powder was added to TiO in the quantity of 0.5 to 5.0 wt%. The photothermal measurements of acetaldehyde decomposition indicated that the highest yield of acetaldehyde conversion on TiO and UV irradiation was obtained at 75 °C. The doping of nickel to TiO did not increase its photocatalytic activity. Contrary to that, the application of nickel foam as a support for TiO appeared to be highly advantageous because it increased the decomposition of acetaldehyde from 31 to 52% at 25 °C, and then to 85% at 100 °C in comparison with TiO itself. At the same time, the mineralization of acetaldehyde to CO doubled in the presence of nickel foam. However, oxidized nickel foam used as support for TiO was detrimental. Most likely, different mechanisms of electron transfer between Ni-TiO and NiO-TiO occurred. The application of nickel foam greatly enhanced the separation of free carriers in TiO. As a consequence, high yields from the photocatalytic reactions were obtained.
在25 - 125°C的温度范围内加热以及对掺杂金属镍粉的TiO和负载在泡沫镍上的TiO进行紫外线照射的条件下，进行乙醛分解反应。该过程在高温反应室“The Praying Mantis”中进行，同时进行原位傅里叶变换红外光谱测量和紫外线照射。镍粉以0.5至5.0 wt%的量添加到TiO中。乙醛分解的光热测量表明，在TiO和紫外线照射下，乙醛转化率的最高产率在75°C时获得。镍掺杂到TiO中并没有提高其光催化活性。与此相反，将泡沫镍用作TiO的载体似乎具有很大优势，因为与TiO本身相比，在25°C时它将乙醛的分解率从31%提高到52%，在100°C时提高到85%。同时，在泡沫镍存在的情况下，乙醛矿化生成CO的量增加了一倍。然而，用作TiO载体的氧化泡沫镍是有害的。很可能在Ni - TiO和NiO - TiO之间发生了不同的电子转移机制。泡沫镍的应用极大地增强了TiO中自由载流子的分离。因此，获得了光催化反应的高产率。
