Eco-Friendly Photocatalysts for Degradation of Dyes

In the current era of globalization, synthetic dyes are one of the key factors of water pollution. Photocatalysis constitutes a promising technology for the treatment of wastewater, especially to those containing hard-to-remove organic compounds. Zinc oxide nanoparticles (ZnONPs) play a vital role a...

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Bibliographic Details
Published in:Catalysts 2020-10, Vol.10 (10), p.1129
Main Authors: Lau, Gee Een, Che Abdullah, Che Azurahanim, Wan Ahmad, Wan Amir Nizam, Assaw, Suvik, Zheng, Alvin Lim Teik
Format: Article
Language:English
Subjects:
Antioxidants
Catalysts
Chemical reactions
Clean technology
Composition
Dyes
Dyes and dyeing
Flavonoids
Globalization
Gram-positive bacteria
green synthesis
Industrial applications
Metabolites
Methods
Microscopy
Morphology
Nanoparticles
Organic chemicals
Organic compounds
Photocatalysis
Photocatalysts
photocatalytic
Photodegradation
Pollutants
Purification
Reagents
Reducing agents
Sewage
Sodium hydroxide
Synthesis
Thermal stability
Toxicity
Ultraviolet radiation
Wastewater treatment
Water pollution
Zinc compounds
Zinc oxide
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Summary:In the current era of globalization, synthetic dyes are one of the key factors of water pollution. Photocatalysis constitutes a promising technology for the treatment of wastewater, especially to those containing hard-to-remove organic compounds. Zinc oxide nanoparticles (ZnONPs) play a vital role as a photocatalyst material. This research highlights the synthesized ZnONPs with roselle flower and oil palm leaf extract. The extracts and sodium hydroxide (NaOH) act as reducing agents during the synthesis process. Synthesis without the addition of plant extract is used as blank control for the experiment. Structural and optical studies of the three variants of ZnONPs were performed. High purity of ZnONPs with element Zn and O was obtained. The size of the three variants of ZnONPs was from 10–15 nm and found in agglomerated spherical shape. Large band gap, 3.2 eV was obtained by UV-Vis and high thermal stability was proven by TGA. Oxygen vacancies that assist in the degradation phenomenon were found in ZnONPs. Five percent of ZnONPs with the presence of 10 W UV light could effectively degrade 10 ppm MO in 5 h and MB in 3 h. Besides, high antioxidant properties and low toxicity demonstrated the ability of ZnONPs to be used as photocatalysts. In conclusion, ZnONPs can be further developed for pharmaceutical and industrial use.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal10101129