Fabrication of ion doped WO3 photocatalysts through bulk and surface doping
Laixue Pang , Nianfeng Han , Xiaoying Wang
,
Xiuying Hu
DOI:10.1016/j.jes.2015.04.007
Received October 20, 2014,Revised April 09, 2015, Accepted April 21, 2015, Available online June 18, 2015
Volume 35,2015,Pages 76-82
Na+ doped WO3 nanowire photocatalysts were prepared by using post-treatment (surface doping) and in situ (bulk doping) doping methods. Photocatalytic degradation of Methyl Blue was tested under visible light irradiation, the results showed that 1 wt.% Na+ bulk-doped WO3 performed better, with higher photoactivity than surface-doped WO3. Photoelectrochemical characterization revealed the differences in the photocatalytic process for surface doping and bulk doping. Uniform bulk doping could generate more electron–hole pairs, while minimizing the chance of electron–hole recombination. Some bulk properties such as the bandgap, Fermi level and band position could also be adjusted by bulk doping, but not by surface doping.
