首页|The synergic effects of light harvesting and separation of charge carriers, and the optimal band gap of photocatalysts by investigating Bi8V2O17, Bi4V2O11, BiVO4 and Bi4V6O21
The synergic effects of light harvesting and separation of charge carriers, and the optimal band gap of photocatalysts by investigating Bi8V2O17, Bi4V2O11, BiVO4 and Bi4V6O21
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NSTL
Elsevier
The light harvesting and separation of charge carriers are two decisive factors in the photocatalytic process. In order to reveal the synergic effects of light absorption and separation of charge carriers, and put forward the optimal band gaps of specific photocatalytic systems, Bi8V2O17, Bi4V2O11, BiVO4 and Bi4V6O21 series samples with the V/Bi = 0.25, 0.5, 1 and 1.5 were successfully designed and synthesized. UV-Vis diffuse reflectance spectra (DRS) indicated that the visible light harvesting was tremendously enhanced with the increase of V/Bi ratio. Due to the narrow down of band gaps, photoluminescence (PL) illustrated that the separation of electron-hole pairs was gradually restrained. Although Bi(8)V(2)O(17 )showed the best separation of electron-hole pairs, and Bi4V6O21 had the best light harvesting range, but the photocatalytic experiments showed that the optimal sample is Bismuth vanadate (BiVO4). Density functional theory (DFT) calculation has been utilized to explain the above inconsistency, and a promising formula has been put forward to calculate the regularity of light harvesting and separation of electron-hole pairs in the photocatalytic systems. This work constructed the relation between light absorption and separation of electron-hole pairs, and creatively proposed a reliable band gap calculation method to forecast and design of efficient photocatalysts.
Bi8V2O17Bi4V2O11BiVO4Bi4V6O21Semiconductor photocatalystDensity functional theory calculationPhotocatalytic activityHETEROJUNCTION PHOTOCATALYSTSAIR PURIFICATIONWATER OXIDATIONCONSTRUCTIONDEGRADATIONPERFORMANCEREDUCTIONTIO2
NSTL
Elsevier
