Antibacterial properties of TiO2 ceramic pellets prepared using nano TiO2 powder

Abstract

Titanium dioxide (TiO 2 ) porous ceramic pellets with three dimension nano-structure were prepared using nano TiO 2 powder. The TiO 2 porous ceramic pellets were composed of TiO 2 nanoparticles with 14-16 nm in diameter and had porosity of 74.85%. The mean pore size of the TiO 2 porous ceramic pellets was 20.73 nm and the main pore size ranged from 3 to 16 nm. The mass loss of the TiO 2 ceramic pellets was less than 5% after 20 d immersion in water. The antibacterial properties of the TiO 2 pellets were studied. The sterilization rate of Colibacillus (hospital polluted water with bacterium) can reach 99% after 3 h photocatalytic process and these TiO 2 pellets are easy to be re-activated and cyclically be used. The shaping mechanism and photocatalysis sterilization mechanism of the TiO 2 pellets were discussed.

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

“…The antimicrobial activity against Colibacillus was 99% after 3 h of photocatalytic reaction. The photocatalytic activity of porous TiO 2 ceramic pellets did not change after their regeneration by calcination at 600 • C for 2 h [51].…”

“…The advantages of TiO 2 pellets come from their ease of production, low required amounts of raw materials, lack of substrate necessity, and compatibility with mass production [20,51]. Compared with the above microscale TiO 2 pellets, TiO 2 pellets can be prepared by different and simple conventional methods, such as tumble growth, tableting, and extrusion.…”

“…TiO 2 pellets, which were calcinated at 1180 • C, had high packing microcrystal density [114]. Yao et al (2009) also prepared TiO 2 ceramic pellets from TiO 2 powder. Briefly, TiO 2 powders of 7-8 and 20-50 nm diameters were mixed with DI water (25-30 wt%) and kneaded into TiO 2 ceramic pellets (diameter: 2-4 nm).…”

“…In contrast, TiO 2 macroscale structures mostly have a lower surface area than powder TiO 2 NPs [ 32 , 51 ]. The sintering processes at a high temperature can explain the reduction of the surface area of TiO 2 pellets [ 32 , 52 , 53 ].…”

“…The sintering processes at a high temperature can explain the reduction of the surface area of TiO 2 pellets [ 32 , 52 , 53 ]. However, compared to TiO 2 NPs, TiO 2 macroscale structures such as TiO 2 porous ceramic pellets have more optical activity centers and more carriers, while the photocatalytic activity lasts for a longer time [ 51 ]. In techniques such as hot isostatic pressing (HIPing), the contamination of carbon could lower the bandgap and increase the photocatalytic performance [ 1 ].…”