Enhanced photocatalytic performance of nanosized coupled ZnO/SnO2 photocatalysts for methyl orange degradation

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

“…At periodic intervals, 5 ml suspension were taken from the system, centrifuged, and filtered through a 0.2-m millipore filter to remove the photocatalyst particles. The filtrates were then analyzed by using a spectrophotometer (723, Shanghai spectrum Instruments Co., Ltd.) at its maximum absorption wavelength of 464 nm [21].…”

Influence of Size and Shape on the Photocatalytic Properties of SnO2 Nanocrystals

“…[12,13] Oxygen vacancy defects in NCs, which result from changes in morphology, may act as active centers to capture photoinduced electrons that control the electronhole recombination process. On the other hand, core-shell structures such as SnO 2 /TiO 2 , [14][15][16] SnO 2 /ZnO, [17,18] SnO 2 /CdS, [19] SnO 2 /Fe 2 O 3 , [20] and so on may have potential for improving the photocatalytic activity of SnO 2 because of the higher charge separation during photoexcitation. The photoinduced electrons are excited from the valence band to the conduction band and are generally captured by the trapped states in the case of doped SnO 2 NCs.…”

Characterization and photoactivity of coupled ZnO–ZnWO4 catalysts prepared by a sol–gel method

“…ZnO has been coupled to various semiconductors such as ZnO-TiO 2 [11][12][13], ZnO-CdS [14,15], ZnO-SnO 2 [16][17][18][19][20][21] to improve its photocatalytic activity. Only few publications have concerned the synthesis of ZnO-ZnWO 4 [22,23] and ZnO-ZnWO 4 -WO 3 [24] photocatalysts to be employed for the photodegradation of organic compounds.…”