Design of Porous Silica Supported Tantalum Oxide Hollow Spheres Showing Enhanced Photocatalytic Activity

作者：Sharma Manu; Das Debashree; Baruah Arabinda; Jain Archana; Ganguli Ashok K^*

来源：Langmuir, 2014, 30(11): 3199-3208.

DOI：10.1021/la500167a

Silica-supported tantalum oxide (ST) hollow spheres were designed for photocatalytic applications in the UV range of 4.1 to 4.8 eV. These nanostructures with a variable diameter of 100-250 nm and shell thickness of 24-58 nm were obtained by the hydrothermal treatment of tantalum isopropoxide and tetraethylorthosilicate at 120 degrees C for 48 h in the presence of cetyl trimethyl ammonium bromide, which was used as a capping agent. The maximum observed surface area was found to be 610 m(2)/g and pore size distribution of ST hollow spheres varied from 13.4 to 19.0 nm. Lewis acidity of silica and the contact area between SiO2 and Ta2O5 plays a crucial role in controlling the photocatalytic properties of the ST hollow spheres. We observe a remarkable 6x enhancement in the photoactivity of silica-supported tantalum oxide hollow spheres compared to pure Ta2O5.

• 出版日期2014-3-25