Enhanced photocatalytic activity of cadmium-doped Bi2WO6 nanoparticles under simulated solar light

Abstract

Novel cadmium-doped Bi 2 WO 6 nanoparticles with different Cd contents have been synthesized by a one-step route using ethylene glycol and water as solvents at 180°C for 12 h. The as-synthesized samples were characterized in detailed by SEM, XRD, EDS, HRTEM, UV-Vis DRS, BET techniques, and so on. The results shown that with the increase of the Cd 2? addition, the crystal structure, lattice space, and absorption edge were not significantly changed and the calculated band gap value was 2.58 eV. However, the flower-like Bi 2 WO 6 sphere was gradually destroyed. Simultaneously, the surface area and photocurrent responses of the catalysts were greatly increased. Photocatalytic activity of the Cd-doped Bi 2 WO 6 samples was determined by monitoring the change of RhB concentration under simulated solar light. The results revealed that cadmium doping greatly improved the photocatalytic efficiency of Bi 2 WO 6 . The Bi 2 WO 6 sample with R Cd = 0.05 displayed the highest photocatalytic activity, and the degradation rate is about two times greater than pure Bi 2 WO 6 . Moreover, the Cd-Bi 2 WO 6 photocatalyst remained stable even after five consecutive cycles. A possible mechanism of photocatalytic activity enhancement on basis of the experimental results was proposed.

Constructing the Vo-TiO2/Ag/TiO2 Heterojunction for Efficient Photoelectrochemical Nitrogen Reduction to Ammonia

“…The initial absorption edge of about 410 nm for TiO 2 nanorod arrays corresponds to the intrinsic absorption of rutile TiO 2 . All Ag/TiO 2 composite samples exhibited obvious visible light response in the range of 425–500 nm due to the Ag LSPR at 457 nm . The V o -TiO 2 /TiO 2 not only maintained the intrinsic absorption of rutile TiO 2 but also showed a peak tail in the range of 410–800 nm.…”

“…47 All Ag/TiO 2 composite samples exhibited obvious visible light response in the range of 425− 500 nm due to the Ag LSPR at 457 nm. 48 The V o -TiO 2 /TiO 2 not only maintained the intrinsic absorption of rutile TiO 2 but also showed a peak tail in the range of 410−800 nm. The 100 C−Ag/TiO 2 electrode was further loaded with black V o -TiO 2 nanosheets.…”

Heterojunction BiOI/Bi2MoO6 nanocomposite with much enhanced photocatalytic activity

“…This may indicate that BiOI is a better choice for Bi 2 MoO 6 to serve as the photosensitizer. The energy level and band gap of semiconductors may reflect its ability to harvest visible light radiation, and the band gap (E g ) can be calculated by the formula (Song et al 2015):…”