US EPA

1767709 

Journal Article 

Preparation of Ag/TiO2/PA Self-Cleaning Paint by In-suit Polymerization and Its Antimicrobial Properties 

Chen Haifeng; Tang Peisong; Pan Guoxiang; Cao Feng; Tong Yanhua 

2012 

41 

254-257 

WOS:000314485200066 

Using the materials of butyl-titanate, acetic acid, ethanol,
the concentrated solution containing about 250 nm nano-TiO2 particles was prepared, the size
distribution coefficient of 0.631. Polycrystalline nano-TiO2 particles were examined by
transmission electron microscopy (TEM) and the laser particle size analyzer. Adopting this stable
concentrated solution, we obtained the nano TiO2 modified poly acrylic acid resin (TiO2/PA)
coating on aluminum foils. From UV-vis spectra and diffuse reflectance spectroscopy spectra
(DRS), it is found that the nano-TiO2 particles have a strong absorption effect on the UV. Using
the concentrated solution-modified additive and the method of in-situ polymerization, the coating
could generate Ag nanoparticles, and finally Ag/TiO2/PA coating was obtained. According to the
national standard GBT 1741-2007 Anti-mold test, the Ag/TiO2/PA exterior wall coating had no
significant mold growth. For TiO2/PA coating, we are invisible or difficult to see the long
bacteria, but the long bacteria can be seen clearly under a magnifying glass phenomenon.
Ag/TiO2/PA has a strong antibacterial activity on Escherichia coli and Staphylococcus aureus, and
its minimum inhibitory concentration (MIC) is of 7.285x10(-5) mg/mL. The antibacterial effect of
Ag is obvious, but it could not eliminate toxic substances released by the dead bacteria. Relying
on the photocatalytic properties of three films, its efficiency was tested with methyl orange
(MO) under visible light by UV-vis spectrophotometer at 464 nm. After 2.5 h the decolorization
rate is close to 50%, and the reason of photocatalytic ability of the coating is subject to mass
of TiO2 on the surface. 

silver; TiO2; poly acrylic; photocatalysis; anti-bacterial; in-situ polymerization