Effects of Vacuum on Photocatalytic Activity of TiO2

被引：3

作者：

Shimosako, N. ^{[1
]}

Egashira, T. ^{[1
]}

Yoshino, K. ^{[1
]}

Shimazaki, K. ^{[2
]}

Miyazaki, E. ^{[2
]}

Sakama, H. ^{[1
]}

机构：

[1] Sophia Univ, Dept Engn & Appl Sci, Chiyoda Ku, 7-1 Kioi Cho, Tokyo 1028554, Japan

[2] Japan Aerosp Explorat Agcy, Res & Dev Directorate, Res Unit 1, 2-1-1 Sengen, Tsukuba, Ibaraki 3058505, Japan

来源：

SYSTEMS CONTAMINATION: PREDICTION, CONTROL, AND PERFORMANCE 2018 | 2018年 / 10748卷

关键词：

Spacecraft; Contamination; Photocatalyst; TiO2; Vacuum; GC/MS; DEGRADATION;

D O I：

10.1117/12.2320500

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Contamination outgassed from spacecraft's materials can degrade optical devices in orbit. Therefore, solving the contamination problem is important because it influences the success of spacecraft missions. In this study, methyl red (MR) and oleamide were decomposed in vacuum by TiO2 photocatalyst. Absorbance spectra, mass decrease and GC/MS were measured after and before decomposition. In vacuum, TiO2 could decompose MR to intermediate products, whereas it could not decompose the intermediate products to volatile substances because TiO2 cannot open benzene rings of the intermediate products. On the other hand, TiO2 could decompose oleamide to volatile substances even in vacuum. However, decomposition by TiO2 stopped 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.

引用

页数：8

共 10 条

[1] [Anonymous], 1993, MILITARY STANDARD 12
[2] TiO2 photocatalysis and related surface phenomena
Fujishima, Akira
Zhang, Xintong
Tryk, Donald A.
[J]. SURFACE SCIENCE REPORTS, 2008, 63 (12) : 515 - 582
[3] Effect of reaction conditions on methyl red degradation mediated by boron and nitrogen doped TiO2
Galenda, A.
Crociani, L.
El Habra, N.
Favaro, M.
Natile, M. M.
Rossetto, G.
[J]. APPLIED SURFACE SCIENCE, 2014, 314 : 919 - 930
[4] Photocatalytic degradation of a mixture of Crystal Violet (Basic Violet 3) and Methyl Red dye in aqueous suspensions using Ag+ doped TiO2
Gupta, AK
Pal, A
Sahoo, C
[J]. DYES AND PIGMENTS, 2006, 69 (03) : 224 - 232
[5] Mahmoud MA, 2009, S AFR J SCI, V105, P299
[6] Investigation into tolerance of polysiloxane-block-polyimide film against atomic oxygen
Miyazaki, Eiji
Tagawa, Masahito
Yokota, Kumiko
Yokota, Rikio
Kimoto, Yugo
Ishizawa, Junichiro
[J]. ACTA ASTRONAUTICA, 2010, 66 (5-6) : 922 - 928
[7] Decomposition of dioctyl phthalate (DOP) using titanium dioxide photocatalyst in a vacuum
Shimosako, N.
Shimazaki, K.
Miyazaki, E.
Sakama, H.
[J]. SYSTEMS CONTAMINATION: PREDICTION, CONTROL, AND PERFORMANCE 2016, 2016, 9952
[8] Effects of atomic oxygen on titanium dioxide thin film
Shimosako, Naoki
Hara, Yukihiro
Shimazaki, Kazunori
Miyazaki, Eiji
Sakama, Hiroshi
[J]. ACTA ASTRONAUTICA, 2018, 146 : 1 - 6
[9] Urayama F., 2008, J. Jpn. Soc. Aeronaut. Space Sci., V56, P543, DOI [10.2322/jjsass.56.543, DOI 10.2322/JJSASS.56.543]
[10] Urayama F., 2007, Space Technology Jpn., V6, P81, DOI [10.2322/stj.6.81, DOI 10.2322/STJ.6.81]

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