Effect of Metal Ions (Ag, Co, Ni, and Pd) on the Visible Light Degradation of Rhodamine B by Carbon-Covered Alumina-Supported TiO2 in Aqueous Solutions

2013 ◽  
Vol 52 (5) ◽  
pp. 1783-1794 ◽  
Author(s):  
Mphilisi M. Mahlambi ◽  
Ajay K. Mishra ◽  
Shivani B. Mishra ◽  
Rui W. Krause ◽  
Bhekie B. Mamba ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Visible Light ◽  
Metal Ions ◽  
Rhodamine B ◽  
Supported Tio2 ◽  
Visible Light Degradation ◽  
Carbon Covered Alumina

Evaluation of ZnO/Carbon Xerogel Composite as a Photocatalyst for Solar and Visible Light Degradation of the Rhodamine B Dye

2021 ◽  
Vol 21 (4) ◽  
pp. 2292-2301
Author(s):  
Gabriela Spirandelli dos Santos ◽  
Clarice Moreira Goes ◽  
Juliana Giancoli Martins de Sousa ◽  
Nicolas Perciani de Moraes ◽  
Livia Chaguri ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Rhodamine B ◽  
Carbonaceous Material ◽  
Active Species ◽  
Hexagonal Structure ◽  
Process Efficiency ◽  
Carbon Xerogel ◽  
Environmental Aspect ◽  
Visible Light Degradation

This study is focused on the evaluation of the Rhodamine B photodegradation using ZnO/carbon xerogel composite as a photocatalyst, in order to enhance the photocatalytic process efficiency under visible light. The proposed synthesis employs tannin as a precursor for the carbon xerogel, which enhances the economic and environmental aspect of the composite. The synthesized materials have the hexagonal structure of the zinc oxide (wurtzite), which is homogeneously distributed on the carbonaceous matrix. The diffuse reflectance test shows that light absorption was significantly enhanced for the composite. The solar light-driven photodegradation results revealed that the synthesized composite achieved virtually complete degradation of the dye present in the solution in less than 3 h, in all concentrations tested. The results of visible light driven photocatalysis showed that the carbonaceous material presents better photoactivity than the pure oxide (70% and 40% degradation of Rhodamine B, respectively), due to the synergistic effect between the carbon xerogel and zinc oxide on the properties of the composite. The photocatalytic mechanism main active species are the photogenerated vacancies and superoxide radicals.

Highly efficient visible light degradation of Rhodamine B by nanophasic Ag3PO4 dispersed on SBA-15

2014 ◽  
Vol 193 ◽  
pp. 154-159 ◽  
Author(s):  
Jianfeng Ma ◽  
Liangyin Li ◽  
Jing Zou ◽  
Yong Kong ◽  
Sridhar Komarneni
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Highly Efficient ◽  
Visible Light Degradation

scholarly journals TiO2Nanocatalysts Supported on a Hybrid Carbon-Covered Alumina Support: Comparison between Visible Light and UV Light Degradation of Rhodamine B

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Mphilisi M. Mahlambi ◽  
Ajay K. Mishra ◽  
Shivani B. Mishra ◽  
Rui W. Krause ◽  
Bhekie B. Mamba ◽  
...  
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Uv Light ◽  
Reaction Rate Constant ◽  
Titania Nanoparticles ◽  
Impregnation Method ◽  
Alumina Support ◽  
Photodegradation Efficiency ◽  
Carbon Covered Alumina ◽  
Hybrid Carbon

Titania nanoparticles were successfully supported on carbon-covered alumina (CCA) supports via the impregnation method to form carbon-covered alumna titania (CCA/TiO2). The CCA supports were synthesised through an equilibrium adsorption of toluene 2,4-diisocyante where the N=C=O irreversibly adsorbs on the alumina and pyrolysis at 700°C affords CCA supports. These CCA/TiO2nanocatalysts were tested for their photocatalytic activity both under UV and visible light using Rhodamine B as a model pollutant. The reaction rate constant of the CCA/TiO2was found to be higher than that of unsupported titania and the reaction kinetics were found to follow an apparent first-order rate law. The CCA/TiO2nanocatalysts had a much larger surface area than the unsupported titania and they exhibited overall higher photodegradation efficiency under both UV and visible light than unsupported TiO2.

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