Surface conjugation of titanium dioxide nanoparticles on nano-graphene oxide enhances photocatalytic degradation of azo dyes under sunlight

Here, conjugate of nano-graphene oxide (GO) and titanium dioxide nanoparticle (nTiO 2 ) was proposed for the photocatalytic degradation of two toxic azo dyes, Congo red (CR) and Methylene blue (MB), under sunlight irradiation. Furthermore, the optimized weight ratio between GO and nTiO 2 of 1:5 demo...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-06, Vol.29 (26), p.40226-40240
Main Authors: Das, Sohel, Singh, Vineeta, Paul, Subhankar
Format: Article
Language:English
Subjects:
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Azo Compounds
Azo dyes
Catalysis
Color removal
Conjugation
Degradation
Dyes
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Graphene
Irradiation
Methylene Blue
Nanoparticles
Photocatalysis
Photocatalysts
Photodegradation
Radiation
Research Article
Sunlight
Titanium
Titanium dioxide
Waste Water Technology
Water
Water Management
Water Pollution Control
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Summary:Here, conjugate of nano-graphene oxide (GO) and titanium dioxide nanoparticle (nTiO 2 ) was proposed for the photocatalytic degradation of two toxic azo dyes, Congo red (CR) and Methylene blue (MB), under sunlight irradiation. Furthermore, the optimized weight ratio between GO and nTiO 2 of 1:5 demonstrated the highest degradation efficiency. The nanoconjugate induced 85% degradation of 40 ppm of CR in 60 min and a complete degradation within 70 min, while it degraded more than 90% of 20 ppm of MB in 80 min. The photocatalyst can be reused for five cycles of photocatalysis. Thus, the photocatalytic potential of GO/nTiO 2 under visible light may be used as a very suitable and cost-effective photocatalyst industrially for the removal of toxic dyes from water.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-18796-w