Effects of vacuum on photocatalytic activity of TiO2

Effects of vacuum on photocatalytic activity of TiO2
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真空对TiO2光催化活性的影响

DOI:
10.1117/12.2320500
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发表时间:
2018
期刊:
Proc. SPIE
影响因子:
--
通讯作者:
and H. Sakama
and H. Sakama
中科院分区:
--
文献类型:
--
作者:
1.N. Shimosako;T. Egashira;K. Yoshino;K. Shimazaki;E. Miyazaki;and H. Sakama

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航天器材料释放出的污染会使轨道上的光学设备退化。因此,解决污染问题非常重要,因为它关系到航天器任务的成功。在本研究中,甲基红(MR)和油酰胺在真空中以二氧化钛为光催化剂进行降解。测定了分解前后的吸收光谱、质量下降和GC/MS。在真空条件下,二氧化钛能将MR分解成中间产物,但由于不能打开中间产物的苯环,不能将中间产物分解成挥发性物质。另一方面,即使在真空条件下,二氧化钛也能将油酰胺分解成挥发性物质。然而,在真空中,二氧化钛的分解在一定时间后停止。与标准分子污染水平相比,真空中光催化反应对油酰胺的质量降低是足够的。
Contamination outgassed from spacecraft's materials can degrade optical devices in orbit. Therefore, solving the contamination problem is important because it in uences the success of spacecraft missions. In this study, methyl red (MR) and oleamide were decomposed in vacuum by TiO2photocatalyst. Absorbance spectra, mass decrease and GC/MS were measured after and before decomposition. In vacuum, TiO2could decompose MR to intermediate products, whereas it could not decompose the intermediate products to volatile substances because TiO2cannot open benzene rings of the intermediate products. On the other hand, TiO2could decompose oleamide to volatile substances even in vacuum. However, decomposition by TiO2stopped after a certain period of time in vacuum. The decrease in mass for oleamide by photocatalytic reaction in vacuum was enough compared to standard molecular contamination levels.
DOI: 10.2322/stj.6.81
发表时间: 2007
期刊: Space Technology Japan, The Japan Society for Aeronautical and Space Sciences
影响因子: --
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