Synthesis and characterization of nitrogen and sulfur-codoped Bi_2WO_6 photocatalyst

【摘要】：正In this paper,N and S codoped Bi_2WO_6(denoted as N/S-BiWO)nanoarchitectures have been synthesized via a facile template-free hydrothermal process.The samples were characterized by XRD,XPS, FE-SEM,HR-TEM,UV-Vis-DRS,XPS,elemental analysis and photoluminescence spectrum(PL).The doping effect on the properties and photocatalytic activity of Bi_2WO_6 was investigated.The photocatalytic activity of N/S-BiWO is enhanced greatly compared with pure Bi_2WO_6.The PL intensity of N/S-BiWO is lower than that of pure Bi_2WO_6,which clearly indicates that the recombination of photogenerated charge carrier between the hybird orbital of Bi 6s and O2p(VB)to the W 5d orbital is greatly inhibited in the N/S-BiWO.On the basis of the calculated energy band positions and PL spectra,the mechanism of enhanced photocatalytic activity of N/S-BiWO has also been discussed.