Ulster University Logo

Bactericidal effects of titanium dioxide-based photocatalysts

Coleman, Heather, Marquis, C.P., Scott, J.A., Chin, S.-S. and Amal, R. (2005) Bactericidal effects of titanium dioxide-based photocatalysts. Chemical Engineering Journal, 113 (1). pp. 55-63. [Journal article]

Full text not available from this repository.

URL: http://dx.doi.org/10.1016/j.cej.2005.07.015

DOI: doi:10.1016/j.cej.2005.07.015

Abstract

The photocatalytic degradation of E. coli in water by various catalysts was investigated in a batch spiral reactor. Commercial Degussa P25 (P25), as well as novel magnetic and hydrothermally prepared photocatalysts (MPC and HPC) were investigated in a slurry system. P25 was found to be the most effective catalyst, followed by the HPC and the MPC. Cell destructions followed first order kinetics. Non-buffered samples displayed a greater bactericidal efficiency which was attributed to a decrease in electrostatic repulsions between TiO2 and E. coli and also elevated stress on E. coli at acidic pH. Buffered (NaHCO3) samples showed a decrease in bactericidal efficiency due to HCO3− ions competing with oxidising species and blocking (by adsorption) the TiO2 particles. The optimum catalyst loading for P25 and HPC was 1 and 2 g/L for MPC and was attributed to mass transfer effects (bulk diffusion, available active site and shadowing). An immobilised P25 system was found to be more efficient than the MPC and comparable with the HPC in suspension. The addition of silver to the immobilised system was found to enhance the photocatalytic degradation.

Item Type:Journal article
Keywords:Photocatalysis; E. coli; Titanium dioxide; Magnetic photocatalyst; Hydrothermal photocatalyst; Immobilised TiO2; Silver deposited TiO2
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:35710
Deposited By: Dr Heather Coleman
Deposited On:08 Sep 2016 08:15
Last Modified:17 Oct 2017 16:25

Repository Staff Only: item control page