A Floatable and Highly Water-Durable TiO2-Coated Net for Photocatalytic Antibacterial Water Treatment in Developing Countries

A TiO2-coated net with photocatalytic antibacterial properties that purifies water for practical use in developing countries was fabricated. The TiO2 particles were modified with a silane coupling agent, aminopropyltriethoxysilane or hexadecyltrimethoxysilane, to improve particle dispersibility. The...

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Bibliographic Details
Published in:Water (Basel) 2023-01, Vol.15 (2), p.320
Main Authors: Izuma, Dylan Shun, Suzuki, Norihiro, Suzuki, Tomonori, Motomura, Haruka, Ando, Shiro, Fujishima, Akira, Teshima, Katsuya, Terashima, Chiaki
Format: Article
Language:English
Subjects:
Aminopropyltriethoxysilane
Bacteria
Coatings
Composite materials
Coupling agents
Developing countries
Drinking water
E coli
Health risks
Inactivation
Infectious diseases
Irradiation
LDCs
Nanoparticles
Oxidation
Photocatalysis
Photocatalysts
Plasma
Reactors
Silicones
Substrates
Sunlight
Titanium dioxide
Tropical diseases
Ultraviolet radiation
Water purification
Water treatment
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Summary:A TiO2-coated net with photocatalytic antibacterial properties that purifies water for practical use in developing countries was fabricated. The TiO2 particles were modified with a silane coupling agent, aminopropyltriethoxysilane or hexadecyltrimethoxysilane, to improve particle dispersibility. The net comprises three layers: a TiO2-silicone photocatalyst layer, a silicone layer to protect the net substrate from the oxidizing power of TiO2, and a polypropylene net substrate. The net is flexible and light enough to float on the surface of water. By modifying the surface of the TiO2 particles, we succeeded in preparing a highly water-durable photocatalyst coating that can be maintained for 49 days of outdoor exposure. The inactivation of E. coli by the TiO2-coated net under 1.0 mW/cm2 of UV irradiation was confirmed. Furthermore, the antibacterial properties were investigated under natural sunlight. The number of E. coli decreased from 320,000 to 10 CFU/mL under natural sunlight in just 2 h. The results showed that the photocatalyst-coated polypropylene net effectively eliminates E. coli from water, reducing the risk of infectious diseases.
ISSN:2073-4441
2073-4441
DOI:10.3390/w15020320