Bacterial Inactivation on Concrete Plates Loaded with Modified TiO2 Photocatalysts under Visible Light Irradiation

Abstract

The antibacterial activity of concrete plates loaded with various titania photocatalysts was investigated. The target in bacteria testing was Escherichia coli K12. The presence of photocatalysts in the concrete matrix at a dose of 10 wt.% improved the antibacterial properties, which became significant depending on the type of the added photocatalyst. Total inactivation of E. coli irradiated under artificial solar light was observed on the concrete plates loaded with the following photocatalysts: TiO2/N,CMeOH-300, TiO2/N,CEtOH-100, TiO2/N,CisoPrOH-100 and TiO2/N-300. The modified Hom disinfection kinetic model was found as a best-fit model for the obtained results. The presence of nitrogen and carbon in the photocatalysts structure, as well as crystallite size, surface area and porosity, contributed to the increase of antibacterial properties of concrete plates.

Improving Carbon‐Coated TiO2 Films with a TiCl4 Treatment for Photocatalytic Water Purification

“…TiO 2 and carbon‐modified TiO 2 including nanocarbon/TiO 2 composites, multi‐walled carbon nanotubes coated by TiO 2 , TiO 2 /carbon nanotubes composites etc. have been widely tested for photocatalytic bactericidal activity . The prevalent mechanism for the photocatalytic bactericidal activity of E. coli consists of oxidative damage of the cell wall and cell membrane and alterations of the internal DNA molecules.…”

Preliminary Study on Light-Activated Antimicrobial Agents as Photocatalytic Method for Protection of Surfaces with Increased Risk of Infections

“…However, these coatings have not become widespread in the healthcare environment due to unknown emissions and ecotoxicological effects [22]. There are no risk-benefit analyses, nor a unitary regulatory system approved by regulators, and the lack of clear evidence of benefits and risks can lead to the loss of the potential of these hedging models [20,[23][24][25][26].…”

Self-Cleaning Coatings and Surfaces of Modern Building Materials for the Removal of Some Air Pollutants

“…The antibacterial activity of concrete slabs in tests with Escherichia coli K12 was demonstrated by slabs containing in their structure 10% by weight catalysts such as: TiO 2 /N,C MeOH -300, TiO 2 /N,C EtOH -100, TiO 2 /N,C isoPrOH -100 and TiO 2 /N-300 (where the carbon was from methanol MeOH, ethanol EtOH and isopropanol isoPrOH, and nitrogen was form gaseous ammonia). It should be added, however, that the antibacterial properties differ depending on the type of photocatalyst added [ 115 ].…”