scholarly journals Photocatalytic Degradation of Methylene Blue by Fe/ZnO/SiO2Nanoparticles under Visiblelight

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
R. M. Mohamed ◽  
I. A. Mkhalid ◽  
E. S. Baeissa ◽  
M. A. Al-Rayyani
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Photocatalytic Oxidation ◽  
Catalyst Loading ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Illumination Time

The photocatalytic activity of Fe/ZnO/SiO2catalysts under visible-light irradiation for the degradation of methylene blue was evaluated. The effect of pH, illumination time, amount of catalyst loaded, and initial dye concentration on the degradation efficiency of methylene blue was investigated. The results reveal that the optimum photocatalytic oxidation conditions of methylene blue are as follows:pH=4and illumination time is 30 min, the amount of catalyst loading is 0.075 g/L and 50 ppm methylene blue dye concentration. Under these conditions, the removal efficiency of methylene blue was 100%.

Visible light assisted photocatalytic degradation of methylene blue dye and mixture of dyes using ZrO2-TiO2 nanocomposites

2020 ◽  
Vol 16 ◽  
Author(s):  
Radhakrishna S. Sutar ◽  
Rani P. Barkul ◽  
Meghshyam K. Patil
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Anatase Phase ◽  
Physicochemical Characterization ◽  
Catalytic Efficiency ◽  
Catalyst Loading ◽  
Blue Dye ◽  
Methylene Blue Dye

Background: Different photocatalysts such as TiO2, ZnO, WO3 have been used for degradation of organic pollutants. However, these materials having some limitations, which has been affected the catalytic efficiency in the various transformations. The composites of these materials with other oxide can produce better results by tuning structural as well as optoelectrical properties. The composite of TiO2 with ZrO2 has attracted attention due to their use in different areas as ZrO2 and TiO2 have similar physicochemical features. Methods: This research contain the preparation of ZrO2-TiO2 nanocomposites by hydrothermal method and analysis of photocatalytic activity for degradation of methylene blue and mixture of dyes under visible light irradiation. Results: Physicochemical characterization of ZrO2-TiO2 nanocomposites has been studied by using different techniques. Prepared catalysts has shown anatase phase of TiO2 and tetragonal phase of ZrO2. XRD, FESEM and HRTEM have supported the nanocrystalline nature of the composites. The photocatalytic activity of composites and bare TiO2 samples were demonstrated for the degradation of methylene blue dye. Enhanced activity has been shown by composite having Ti:Zr 3:1 molar proportion i.e., Ti3Zr. Effect of concentration of methylene blue, pH of solution, catalyst loading has been studied by using Ti3Zr. Also, degradation of mixture of three dyes namely methylene blue, rhodamine B and methyl orange has been studied. Conclusion: In summary, prepared zro2-tio2 composites found to be nanocrystalline and visible light active. these catalysts has shown activity for photocatalytic degradation of methylene blue and mixture of dyes.

Drastic photocatalytic degradation of methylene blue dye by neodymium doped zirconium oxide as photocatalyst under visible light irradiation

Optik ◽  
2016 ◽  
Vol 127 (22) ◽  
pp. 10288-10296 ◽  
Author(s):  
C. Dhandapani ◽  
R. Narayanasamy ◽  
S.N. Karthick ◽  
K.V. Hemalatha ◽  
S. Selvam ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Zirconium Oxide ◽  
Light Irradiation ◽  
Blue Dye ◽  
Methylene Blue Dye

Ni, Co and Ni–Co codoping induced modification in shape, optical band gap and enhanced photocatalytic activity of CeO2 nanostructures for photodegradation of methylene blue dye under visible light irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 8651-8660 ◽  
Author(s):  
Sachin Kumar ◽  
Animesh K. Ojha
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Recombination Rate ◽  
Optical Band Gap ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Photo Degradation

The recombination rate of photo-induced electrons and holes for Ni–Co codoped CeO2 nanostructures is reduced significantly, which essentially improve the photocatalytic activity for photo-degradation of MB dye.

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