Evaluation of photocatalytic activities and characteristics of Cu- or Fe-modified nitrogen-doped titanium dioxides for applications in environmental purification
Evaluation of photocatalytic activities and characteristics of Cu- or Fe-modified nitrogen-doped titanium dioxides for applications in environmental purification
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DOI：
10.7567/jjap.55.01aa05
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发表时间：
2016-01-01
影响因子：
1.5
通讯作者：
Morikawa, Takeshi
中科院分区：
文献类型：
--
作者：
Ohwaki, Takeshi;Saeki, Shu;Morikawa, Takeshi
可见光照射下挥发性有机化合物的气体分解率所表现的光催化活性，是众所周知的，通过负载到氮掺杂的二氧化钛（N-TiO 2）的表面上的Cu或Fe化合物来增强。抗微生物性能也已知通过负载到N-TiO 2上的Cu化合物来改善。在这项研究中，乙醛气体的分解率和抗菌性能实现负载铜或铁化合物到N-TiO 2已从实用的角度进行了研究。增强的光催化活性已被证实，和耐久性的Cu或Fe改性的N-TiO 2在乙醛气体分解已被证明。通过考虑加载材料的价态，增强已经被合理化。的增强被推断为在负载的金属化合物的表面处的光芬顿反应所产生的氧化物种的量增加的结果。为了扩大这种可见光敏感光催化剂的室内应用范围，还讨论了粉末的纳米尺寸化和在各种基底上的固定化的改进。(C)2016日本应用物理学会
Photocatalytic activities, as manifested in gas decomposition rates of volatile organic compounds under visible light irradiation, are well known to be enhanced by Cu or Fe compounds loaded onto the surface of nitrogen-doped titanium dioxide (N-TiO2). Antimicrobial properties are also known to be improved by Cu compounds loaded onto N-TiO2. In this study, the acetaldehyde gas decomposition rates and antimicrobial properties achieved by loading Cu or Fe compounds onto N-TiO2 have been investigated from a practical viewpoint. Enhancements of the photocatalytic activities have been confirmed, and the durability of the Cu- or Fe-modified N-TiO2 in acetaldehyde gas decomposition has been demonstrated. The enhancements have been rationalized by considering the valence states of the loaded material. The enhancements were inferred to be a result of increased amounts of oxidative species arising from the photo-Fenton reaction at the surface of the loaded metal compounds. With a view to expanding the range of indoor applications of such visible-light-sensitive photocatalysts, preparation processes, i.e., nanosizing of the powder and improvement of the immobilization on various substrates, are also discussed. (C) 2016 The Japan Society of Applied Physics