Quantitative analysis of variations in initialbacillus pumilusspore densities in aqueous TiO₂suspension and design of a photocatalytic reactor

Bacterial inactivation kinetics of a photo-disinfection system using novel titania-impregnated kaolinite photocatalyst

“…At a high bacterial loading, the probability of collision between the E. coli and catalyst used increases and directly reduces the mass transfer rates at the catalyst surface. A similar observation was reported by Pham et al [43] in their study on Bacillus pumilus spores in a slurry reactor. Fig.…”

Solar water disinfection (SODIS): A review from bench-top to roof-top

“…E. coli was the most frequently studied microorganism for water disinfection studies [87], as it is an indicator of faecal contamination and reference for water quality. Other bacteria (including spore-forming species) and fungi such as Bacilus pumilus [90], Serratia marcescens, S. aureus [91,92], total coliforms [93], Pseudomonas aeruginosa, S. typhimurium, Enterobacter cloacae, Saccharomyces cerevisiae, C. albicans, F. solani were also inactivated using TiO 2 photocatalysis [94,95]. In addition plant pathogens were found to be inactivated in water using TiO 2 catalyst like spores of F. solani, F. oxysporum, F. verticillioides, F. equiseti and F. anthophilum [65,75].…”

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO2 composites

“…Furthermore, increase of the initial spore content led to increase of the initial reaction rate constant when the rGO/TiO 2 P25 composites were employed as photocatalysts (Table ). Pham et al showed that at higher spore densities, a larger number of viable spores are likely to interact with the photocatalytically generated hydroxyl radicals in comparison to a suspension with lower spore density . Inactivation in the presence of 1% rGO/TiO 2 and 10% rGO/TiO 2 led in all cases in higher rate constants in comparison to the bare TiO 2 P25 (Table ).…”

“…Pham et al showed that at higher spore densities, a larger number of viable spores are likely to interact with the photocatalytically generated hydroxyl radicals in comparison to a suspension with lower spore density. 65,66 Inactivation in the presence of 1% rGO/TiO 2 and 10% rGO/TiO 2 led in all cases in higher rate constants in comparison to the bare TiO 2 P25 (Table 2). Cruz-Ortiz et al investigated the mechanism of inactivation of E. coli using rGO/P25 composites under UV-visible irradiation.…”