Ordered mesoporous Ag-TiO2-KIT-6 heterostructure: synthesis, characterization and photocatalysis
Artikel i vetenskaplig tidskrift, 2009

Ordered mesoporous Ag-TiO2-KIT-6 heterostructured nanocrystals were successfully synthesized by a template-based method, where a layer of TiO2 and Ag2O nanoparticles were deposited on cubic (Ia3d) silica (KIT-6) in an orderly manner; at the same time, the formed Ag2O nanoparticles were photolyzed to metallic Ag nanoparticles. Our results show that Ag-TiO2-KIT-6 is an ordered mesoporous composite material, which is composed of Ag-TiO2 heterostructures and the amorphous KIT-6 template. In addition, Ag-TiO2-KIT-6 possesses the highest photocatalytic activity among the as-synthesized photocatalysts, which can be attributed to the Ag-TiO2 heterojunctions and the excellent texture: (1) Ag-TiO2 heterojunctions improve the separation of photogenerated electron-hole pairs due to the potential energy differences between Ag and TiO2 nanocrystals, thus enhancing the photocatalytic activity; (2) the Ag-TiO2-KIT-6 sample possesses a high BET surface area and a large number of ordered pore channels, which facilitate adsorption and transportation of dye molecules, also leading to higher photocatalytic activity. It was also found that the Ag-TiO2 heterostructure plays a more important role in enhancing the photocatalytic activity than high BET surface area.

property

carbon nanotubes

tio2 films

silica

silver nanoparticles

template

nanocatalyst

frameworks

nanorods

nanocomposites

Författare

Fengling Zhang

Fuzhou University

Y. H. Zheng

Monash University

Y. N. Cao

Fuzhou University

C. Q. Chen

Fuzhou University

Y. Y. Zhan

Fuzhou University

X. Y. Lin

Fuzhou University

Q. Zheng

Fuzhou University

K. M. Wei

Fuzhou University

Jiefang Zhu

Chalmers, Teknisk fysik, Kemisk fysik

Journal of Materials Chemistry

0959-9428 (ISSN) 1364-5501 (eISSN)

Vol. 19 2771-2777

Ämneskategorier

Fysikalisk kemi

DOI

10.1039/b818495j