A review on the visible light active titanium dioxide photocatalysts for environmental applications

Abstract

openAccessArticle: FalsePage Range: 331-331doi: 10.1016/j.apcatb.2012.05.036Harvest Date: 2016-01-12 15:13:44issueName:cover date: 2012-08-21pubType: Revie

Antibacterial properties of F-doped ZnO visible light photocatalyst

“…Furthermore it was noted that among various ZnO powders used in the experiment, powder ZnO:TFA 1:1 was the most effective against E. coli and S. aureus when the visible light was available (log red 2.88 and 4.62, respectively). Based on the studies performed by others [27][28][29][30][31], it is believed that when the light is not available, the primary toxic effect of ZnO on microorganisms can be associated with the release of zinc ions causing disruption of the cell membrane activity and the formation of intercellular reactive oxygen species, mostly H 2 O 2 [32][33][34][35][36][37]. Photocatalysts such as TiO 2 or ZnO activated by UV or/and visible light (Fig.…”

“…Photocatalysts such as TiO 2 or ZnO activated by UV or/and visible light (Fig. 9) [37][38][39][40][41][42][43][44] as a result of the transfer of an electron from the valance band (VB) to the conduction band (CB). The ROS produced as a result of the photocatalytic reaction will be capable of damaging the cell wall and can decompose the cellular materials (Fig.…”

Green synthesis of mesoporous anatase TiO2nanoparticles and their photocatalytic activities

“…3 Among these applications, photocatalysis is considered to be the most practical due to its usage of sunlight to decompose organic pollutants. 4,5 The mechanism involved in photocatalysis reaction exerted by semiconductors, [6][7][8] mainly discussed the formation of free electrons and holes in the conduction and valance band region as explained in the literature. 2,10,20,21 Many methods such as sol gel route, 9,10 hydrothermal, 11 polyol synthesis, 12 and precipitation 13 had been reported in the synthesis of TiO 2 nanoparticles (NPs).…”

Mono- and Dual-modified Titania with a Ruthenium(II) Complex and Silver Nanoparticles for Photocatalytic Degradation of Organic Compounds

“…Besides, ruthenium(II) complexes, which exhibit the desirable visible absorption of metal to ligand charge transfer (MLCT), have also been widely applied to sensitize titania (22,23). Upon visible light irradiation, the photoexcited electrons from ruthenium(II) could be injected to the conduction band of titania, which could be taken up by the substrates or captured to form strong oxidizing species for further reactions (9). performance (21,24,25).…”

“…Titania (TiO 2 ) as the best semiconducting material has been widely employed in energy and environmental areas (1-3), such as dye sensitizer solar cell (DSSC) (4,5), photocatalytic water splitting to generate hydrogen (6)(7)(8), and photocatalytic purification of wastewater (9,10), etc., due to its low cost, photostability in the solution, nontoxicity, redox selectivity and strong oxidizing power of holes (11). However, the wide bandgap energy barrier and recombination of photogenerated electron/hole pairs restrict its broader application (12).…”