“…In addition, the electrochemical impedance spectra ( figure 5(d)) was conducted for the purpose of further exploration about the migration and separation of photo-induced charges. The CSTO-2 possesses the smallest arc radius of Nyquist plots, indicating the most rapid charge migration and efficient separation [38,39], which are in accordance with the above analysis. These results confirm that suitable Cr 3+ doping improve the photoinduced charge transfer and separation, and lead to the enhancement of photocatalytic H 2 evolution.…”
Visible-light-driven Cr-doped SrTiO 3 nanocubes were successfully synthesized by hydrothermal method in alkaline KOH conditions. X-ray diffraction spectroscopy (XRD), Raman spectra, x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterize the samples, and the Cr-doped SrTiO 3 possess cubic morphology with about 30-50 nm in size, and single-crystal feature. In addition, the Cr-doped SrTiO 3 extended light-harvesting properties to visible-light region which was testified by UV-vis absorption spectra, and excellent charge transfer and separation efficiency were approved by photo fluorescence spectra (PL), electrochemical impedance spectroscopy (EIS) and photocurrent response measurements. Among the synthesized photocatalysts, SrTiO 3 nanocubes doped with 2% Cr by molar ratio exhibits the highest photocatalytic activity, achieving 11.66 μmol of H 2 evolution during 5 h visiblelight irradiation. This study provides a facile and effective way to enhance the performance of SrTiO 3 -based photocatalysts.
“…In addition, the electrochemical impedance spectra ( figure 5(d)) was conducted for the purpose of further exploration about the migration and separation of photo-induced charges. The CSTO-2 possesses the smallest arc radius of Nyquist plots, indicating the most rapid charge migration and efficient separation [38,39], which are in accordance with the above analysis. These results confirm that suitable Cr 3+ doping improve the photoinduced charge transfer and separation, and lead to the enhancement of photocatalytic H 2 evolution.…”
Visible-light-driven Cr-doped SrTiO 3 nanocubes were successfully synthesized by hydrothermal method in alkaline KOH conditions. X-ray diffraction spectroscopy (XRD), Raman spectra, x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterize the samples, and the Cr-doped SrTiO 3 possess cubic morphology with about 30-50 nm in size, and single-crystal feature. In addition, the Cr-doped SrTiO 3 extended light-harvesting properties to visible-light region which was testified by UV-vis absorption spectra, and excellent charge transfer and separation efficiency were approved by photo fluorescence spectra (PL), electrochemical impedance spectroscopy (EIS) and photocurrent response measurements. Among the synthesized photocatalysts, SrTiO 3 nanocubes doped with 2% Cr by molar ratio exhibits the highest photocatalytic activity, achieving 11.66 μmol of H 2 evolution during 5 h visiblelight irradiation. This study provides a facile and effective way to enhance the performance of SrTiO 3 -based photocatalysts.
“…A similar blue-shift of the absorption edge of 0.5%, 1%, 2% Bi 2 WO 6 –BiOCl nanosheets could be observed when comparing with BiOCl, and the absorbtion edge of 4% Bi 2 WO 6 –BiOCl showed a obvious red-shift. Based on UV–Vis DRS, the band gap of as-prepared samples can be estimated according to the Kubelka–Munk equation 43 : Figure 5 ( a ) UV–Vis diffuse reflectance spectra and ( b ) (α h ν) 2/n versus h ν plots attached band gap values of BiOCl, Bi 2 WO 6 , 0.5%, 1%, 2%, and 4% Bi 2 WO 6 –BiOCl. where α, h , ν, A, and E g were absorption coefficient, Planck’s constant, light frequency, a constant, and band gap energy, respectively.…”
The application of BiOCl in photocatalysis has been restricted by its low utilization of solar energy and fast recombination of charge carriers. In this study, zero-dimensional (0D) Bi2WO6 nanoparticles/two-dimensional (2D) layered BiOCl heterojunction composite was successfully constructed by facile hydrothermal and solvothermal methods. The most favorable sunlight photocatalytic activity was achieved for the as-prepared Bi2WO6–BiOCl composites with a ratio of 1%. The photocatalytic rate and mineralization efficiency of one typical antibiotic (i.e., oxytetracycline) over 1% Bi2WO6–BiOCl was about 2.7 and 5.3 times as high as that of BiOCl. Both experimental characterizations and density functional theory (DFT) calculations confirmed that the excellent photocatalytic performance mainly arised from the effective charge separation along the Bi2WO6 and BiOCl heterojunction interface. The effective electron transfer was driven by the internal electric field at the interfacial junction. In addition, 1% Bi2WO6–BiOCl exhibited excellent stability, and no apparent deactivation was observed after 4 test cycles. Therefore, the 0D/2D Bi2WO6–BiOCl heterojunction showed a great potential for the photocatalytic degradation of emerging organic pollutants.
“…Compared with the above procedures, the photocatalytic reduction has been considered as a low-cost technique with the merits of the low energy consumption and non-secondary pollution [43]. BiOX(X = Cl, Br, I) photocatalysts have been the comprehensive application in the degradation of organic dyes and pollutants, and recently, it is proved that BiOX photocatalysts also display great potential to the photoreduction of Cr(VI) ions [44][45][46][47][48][49][50][51][52]. However, these obtained BiOX materials have poor ability to photoreduce Cr(VI) ions.…”
2D nanomaterials, with unique structural and electronic features, had been demonstrated as excellent photocatalysts, whose catalytic properties could be tunable with surface defect engineering. In this work, few-layer BiOBr nanosheets with oxygen vacancies (BiOBr-Ov) have been fabricated by a simple solvothermal reaction with the help of ethylene glycol. The obtained BiOBr-Ov exhibited the superior photocatalytic performance with a complete reduction of Cr(VI) (20 mg/L) within 12 min by visible light irradiation. Moreover, Cr(VI) with a high concentration (such as 30 mg/L) only requires 2 min to be photoreduced completely under solar light irradiation. The enhanced photocatalytic performance is contributed to the existence of oxygen vacancies. It has been proved by the results of electrochemical impedance and photocurrent that oxygen vacancies can effectively suppress recombination of photogenerated carriers.
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