scholarly journals Defect engineering for improved photocatalytic performance of reduced lead titanate (PbTiO3) under solar light irradiation

2019 ◽  
Vol 33 (2) ◽  
pp. 373
Author(s):  
M. H. Farooq ◽  
I. Aslam ◽  
H. S. Anam ◽  
M. Tanveer ◽  
M. Rizwan
Keyword(s):  
Lead Titanate ◽  
Photocatalytic Performance ◽  
Light Irradiation ◽  
Solar Light ◽  
Defect Engineering ◽  
Solar Light Irradiation

scholarly journals Oxygen Vacancy Enhanced Photoreduction Cr(VI) on Few-Layers BiOBr Nanosheets

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 558 ◽  
Author(s):  
Yin Peng ◽  
Pengfei Kan ◽  
Qian Zhang ◽  
Yinghua Zhou
Keyword(s):  
Oxygen Vacancies ◽  
Surface Defect ◽  
Photocatalytic Performance ◽  
Electrochemical Impedance ◽  
Light Irradiation ◽  
Solvothermal Reaction ◽  
Defect Engineering ◽  
High Concentration ◽  
Solar Light Irradiation ◽  
2D Nanomaterials

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.

Sodium Ligninsulfonate-assisted Synthesis of Lithium Bismuthate/bismuth Oxide Microspheres and Solar Light Photocatalytic Performance

2021 ◽  
Vol 13 ◽  
Author(s):  
C.H. Yu ◽  
Y.J. Mao ◽  
Z.Y. Xue ◽  
J.L. Kong ◽  
H.Y. Li ◽  
...  
Keyword(s):  
Waste Water ◽  
Bismuth Oxide ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectrum ◽  
Light Irradiation ◽  
Solar Light ◽  
Hydrothermal Temperature ◽  
Solar Light Irradiation ◽  
Duration Time ◽  
Photocatalytic Removal

Background: Great attention has been paid to the environmental pollution by organic dyes which are difficult to be degraded in natural environment and have been an unavoidable and urgent global problem. It is essential to develop green waste water treatment technology with high removal efficiency and low cost to protect surroundings and human health. Objective: The aim of the research is to synthesize lithium bismuthate/bismuth oxide microspheres with good photocatalytic performance for the removal of gentian violet (GV). Methods: Lithium bismuthate/bismuth oxide microspheres were successfully prepared by a sodium ligninsulfonate-assisted hydrothermal synthesis route. The lithium bismuthate/bismuth oxide microspheres were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform infrared spectroscopy (FTIR) and solid UV-vis diffuse reflectance spectrum. Results: XRD pattern and SEM observation show that the lithium bismuthate/bismuth oxide microspheres are composed of cubic LiBi12O18.50 and monoclinic Bi2O3 with the diameter of 250 nm-1 μm. Irregular microscale and nanoscale particles are formed under low hydrothermal temperature, low sodium ligninsulfonate concentration and short duration time. With increasing the sodium ligninsulfonate concentration, hydrothermal temperature and duration time, irregular particles are transferred into microspheres. Lithium bismuthate/bismuth oxide microspheres possess a band gap energy of 1.85 eV suggesting good visible light absorption ability. The photocatalytic removal ability for GV is enhanced by prolonging light irradiation time and microspheres dosage. GV solution with the concentration of 10 mg•L-1 is able to be totally degraded by 10 mg lithium bismuthate/bismuth oxide microspheres in 10 mL GV solution under solar light irradiation for 6 h. Conclusion: The lithium bismuthate/bismuth oxide microspheres show good photocatalytic removal ability toward GV in waste water under solar light irradiation.

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