Enhanced photocatalytic degradation of 2-propanol over macroporous GaN/ZnO solid solution prepared by a novel sol-gel method

Abstract

Macroporous GaN/ZnO solid solution photocatalyst is synthesized through a novel sol-gel method under mild conditions. The performance of as-synthesized solid solution photocatalyst is evaluated for decomposition of gaseous 2-propanol (IPA). It is found that due to enhancement in both the adsorption to gaseous IPA and the absorbance to visible light, the porous GaN/ZnO solid solution exhibits a good photocatalytic performance for IPA decomposition. Moreover, the mechanism for photocatalytic degradation IPA over porous GaN/ZnO solid solution is also investigated in comparison with those for the two end materials ZnO and GaN. The trapping effects with different scavengers prove that both the photoexcited electrons and holes affect the IPA photodegradation process, simultaneously.

Facile synthesis of a ZnO–BiOI p–n nano-heterojunction with excellent visible-light photocatalytic activity

“…To obtain a clear consensus of the reactive species and to further explore the photocatalytic degradation mechanism in detail, an examination was carried out by adding different sacrificial agents at a calculated amount. Benzoquinone (BQ), dimethyl sulfoxide (DMSO) and ethylene diamine tetraacetic acid sodium (EDTA sodium) were adopted as scavengers of O 2 •− [53], • OH [54] radicals and holes [55], respectively. From the results displayed in Fig.…”

Graphene-TiO2 hybrids for photocatalytic aided removal of VOCs and nitrogen oxides from outdoor environment

“…The formation of oxygen- and carbon-centred radicals detected as the corresponding DMPO-adducts is well compatible with the oxidation of IPA adsorbed on TiO 2 surface. The photocatalytic oxidative transformation of IPA is a complex process and acetone as intermediate may be formed by several reaction pathways [77] , [78] . Under those experimental conditions, IPA molecules adsorbed on the photocatalysts’ surface reacts with the photogenerated holes forming the primary alkoxy radicals (CH 3 ) 2 CHO • .…”

“…Under those experimental conditions, IPA molecules adsorbed on the photocatalysts’ surface reacts with the photogenerated holes forming the primary alkoxy radicals (CH 3 ) 2 CHO • . These species rapidly react with other IPA molecules and/or with hydroxyl radicals producing hydroxyalkyl radical [(CH 3 ) 2 • C(OH)], transformed via consecutive reactions to acetone [77] , [78] .

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Photocatalytic Aided Removal of Nitrogen Oxides and VOCs from Outdoor Environment: Graphene as a Highway for Electron Mobility in TiO2 Nanoparticles

“…The formation of oxygen-and carbon-centred radicals detected as the corresponding DMPO-adducts is well compatible with the oxidation of IPA adsorbed on TiO 2 surface. The photocatalytic oxidative transformation of IPA is a complex process and acetone as intermediate may be formed by several reaction pathways [72,73]. Under those experimental conditions, IPA molecules adsorbed on the photocatalysts' surface reacts with the photogenerated holes forming the primary alkoxy radicals (CH 3 ) 2 CHO • .…”