期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 214, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201600665
关键词
core-shell structures; magnetic separation; mesoporous materials; oxides; photocatalysis; TiO2
资金
- National Programs for High Technology Research and Development of China (863) [2013AA032202]
- National Natural Science Foundation of China [61378085, 51479220, 61308095, 51608226]
- Program for the development of Science and Technology of Jilin province [20130102004JC, 201215222, 20140101205JC]
- Program for New Century Excellent Talents in University [NCET-13-0824]
Here, unique Fe3O4/SiO2/mTiO(2) (FST) composites were fabricated, which are composed of a Fe3O4 core with a strong response to magnetic field, an intermediate SiO2 layer as an electronic barrier, and an outer mesoporous TiO2 (mTiO(2)) as the active layer for degradation of organic contaminants. The distinctive approach involved TiO2 shell coating on the surface of Fe3O4/SiO2 (FS) particle using a sol-gel method, followed by the crystallization and mesopore-formation of TiO2 through solvothermal treatment. By changing the dosage of tetrabutyl titanate (TBOT), the thickness and microstructure of TiO2 layer were regulated. Among all as-prepared FST composites, the FST composite that was prepared with 0.6ml TBOT (FST-0.6) possessed a good microstructure and a large specific surface area, and exhibited superior photocatalytic activity toward the degradation of methylene blue (MB) solution. Moreover, recovered FST-0.6 composite with the help of an appropriate magnetic field maintained the activity without significant decline during multiple photocatalytic tests. Accordingly, a rational mechanism was proposed to explain why the FST-0.6 composite showed excellent photocatalytic performance.
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