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Fabrication of Bifunctional Titania/Silica‐Coated Magnetic Spheres and their Photocatalytic Activities
Author(s) -
Song Xuefeng,
Gao Lian
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01989.x
Subject(s) - photocatalysis , crystallinity , materials science , bifunctional , chemical engineering , hydrothermal circulation , methylene blue , aqueous solution , fabrication , nanotechnology , composite material , chemistry , catalysis , organic chemistry , engineering , medicine , alternative medicine , pathology
A magnetic photocatalyst is prepared by coating a magnetic core with a dual layer of inert silica (SiO 2 ) and photoactive titania (TiO 2 ). The complete photoactive TiO 2 shell is directly formed on the SiO 2 ‐coated magnetic spheres. Subsequent hydrothermal treatment improves the degree of crystallinity of TiO 2 . TiO 2 /SiO 2 ‐coated magnetic spheres show good photocatalytic activities in the degradation of methylene blue in the aqueous solution. The photocatalytic TiO 2 surface shell is electrically insulated by the intermediate SiO 2 layer from the magnetic core to maintain good photocatalytic activity of the TiO 2 shell. The magnetic photocatalyst can be easily recovered by applying external magnetic field.