Journal
APPLIED SURFACE SCIENCE
Volume 467, Issue -, Pages 1187-1194Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.10.275
Keywords
Rice husk; SiO2@TiO2 mesoporous structure; Biotemplate; Photocatalysis; Practical application
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Funding
- National Natural Science Foundation of China [51502143]
- Natural Science Foundation of Jiangsu Province [BK20150919]
- Key University Science Research Project of Jiangsu Province [15KJB430022]
- Postdoctoral Science Foundation of China [2016M601791]
- Startup Foundation for Introducing Talent of NUIST [2014r037]
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Mesoporous SiO2@TiO2 photocatalysts with application prospect for organic contaminants degradation were prepared by utilizing rice husk (RH), an easy-available bioresource, as the biotemplate. Structures and physicochemical properties of RH-derived SiO2@TiO2 photocatalysts were systematically characterized and discussed. Results indicate the RH-derived mesoporous and thermal-stable template, which can postpone the anatase-rutile phase transition of TiO2 at high temperatures, is mainly consisted of tightly compacted amorphous SiO2 nanoparticles. Optimized calcination temperature of 700 degrees C is positive for preparing the most active RH-derived SiO2@TiO2, which has the anatase phase, mesoporous structure, proper crystalline degree (grain size of 22.75 nm), specific surface area of 41.13 m(2)/g, and high ability in separating the photogenerated electron-hole pairs, for removal of Rhodamine B (RhB) in aqueous solutions under both the xenon lamp and visible light irradiation. Moreover, large-scale preparation, stable, and recyclable properties of the photocatalysts are also confirmed, which makes them as promising photocatalysts for practical application.
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