Photoassisted detoxification of organic pollutants on the surface modified TiO2 semiconductor particulate system

Role of oxygen active species in the photocatalytic degradation of phenol using polymer sensitized TiO2 under visible light irradiation

“…• or O 2 •− ), and hydrogen peroxide (H 2 O 2 ) [2]. Therefore, oxygen is very important in photocatalytic reactions induced by visible light.…”

“…Photocatalytic degradation of pollutants using TiO 2 has attracted considerable attention for its potential application to environmental problems, and the mechanism of this reaction has been intensively studied [1][2][3]. Despite this research, which has focused mainly on the role of active species leading to the initial photoreaction process, details of the mechanisms of photocatalytic oxidation processes at the TiO 2 surface remain elusive [4].…”

Strategies of making TiO2 and ZnO visible light active

“…Various techniques have been employed to make them absorb photons of lower energy as well. These techniques include surface modification via organic materials [9][10][11][12][13][14][15][16][17][18][19][20] and semiconductor coupling [21][22][23][24][25], band gap modification by creating oxygen vacancies and oxygen sub-stoichiometry [26][27][28], by nonmetals including co-doping of nonmetals and metals doping . The developments made so far through these efforts have been elucidated in this review study.…”

Photocatalytic activity of polymer-modified ZnO under visible light irradiation

“…Advantages of the photocatalytic process include its mild operating conditions and the fact that it can be powered by sunlight, thus reducing significantly the electric power required and therefore the operating costs. Scientists are investigating many semiconductors that can utilize visible light to degrade a high number of recalcitrant materials in aqueous system [1][2][3][4][5][6]. Among the semiconductors whose photocatalytic properties have been studied, TiO 2 is the most commonly used, because it is effective, stable, harmless, and inexpensive [7].…”