Fabrication of Photocatalytic Paper Using TiO2 Nanoparticles Confined in Hollow Silica Capsules

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• 作者：Kensei Fujiwara ; Yasutaka Kuwahara ; Yuki Sumida ; Hiromi Yamashita
• 刊名：Langmuir
• 出版年：2017
• 出版时间：January 10, 2017
• 年：2017
• 卷：33
• 期：1
• 页码：288-295
• 全文大小：552K
• ISSN：1520-5827

文摘

TiO₂ nanoparticles (NPs) encapsulated in hollow silica spheres (TiO₂@HSSs) show a shielding-effect that can insulate photocatalytically active TiO₂ NPs from the surrounding environment and thus prohibit the self-degradation of organic support materials under ultraviolet (UV)-light irradiation. In this study, photocatalytically active papers were fabricated by combining TiO₂@HSS and cellulose fibers, and their photocatalytic activities and durability under UV-light irradiation were examined. The yolk–shell nanostructured TiO₂@HSS, which has an ample void space between inner TiO₂ NPs and an outer silica shell, was synthesized using a facile single-step method utilizing an oil-in-water microemulsion as an organic template. The thus-prepared TiO₂@HSS particles were deposited onto a cellulose paper either by the chemical adhesion process via ionic bonding or by the physical adhesion process using a dual polymer system. The obtained paper containing TiO₂@HSS particles with high air permeability exhibited a higher photocatalytic activity in the photocatalytic decomposition of volatile organic compounds than unsupported powdery TiO₂@HSS particles because of the uniform dispersion on the paper with a reticular fiber network. In addition, the paper was hardly damaged under UV-light irradiation, whereas the paper containing naked TiO₂ NPs showed a marked deterioration with a considerably decreased strength, owing to the ability of the silica shell to prevent direct contact between TiO₂ and organic fibers. This study can offer a promising method to fabricate photocatalytically active papers with a photoresistance property available for real air cleaning.