Exceptional visible-light-driven photocatalytic activity over BiOBr–ZnFe2O4 heterojunctions

Kong, Liang; Jiang, Zheng; Xiao, Tiancun; Lu, Lufeng; Jones, Martin O.; Edwards, Peter P.

doi:10.1039/c1cc10446b

Cited by 260 publications

(147 citation statements)

References 22 publications

Supporting

Mentioning

142

Contrasting

Order By: Relevance

“…These structural virtues together with a suitable band gap around 2.75 eV enable it a reliable candidate for photocatalysis in the visible-light region [7]. However, its catalytic capability is greatly restrained by the high recombination of electron-hole pairs [8,9]. To reduce the recombination possibility and thus enhance the catalytic efficiency, two strategies are generally adopted.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

Chang¹,

Li²,

Chen³

et al. 2014

Superlattices and Microstructures

View full text Add to dashboard Cite

a b s t r a c tExfoliated g-C 3 N 4 (CNs)-BiOBr hybrids with heterojunction structure was fabricated through a chemical deposition-precipitation route. The characterization showed the uniform existence of CNs and BiOBr in hybrids. The fabricated CNs-BiOBr was of enlarged specific surface area, unique optical property, and well-matched energy-band structures. The photocatalytic performance on dye Rhodamine B (RhB) and 2,4-diclorophenol (2,4-DCP) were dramatically improved. Under identical conditions, sample 0.5CNs-BiOBr and CNs-BiOBr were identified as the best candidate, respectively, for catalytic degradation of RhB and 2,4-DCP. The former could show a reaction rate over RhB about 2.7 and 6.8 times as high as BiOBr and CNs alone, and the later exhibited a reaction rate over 2,4-DCP nearly 7.5 and 2.5 times as high as individual BiOBr and CNs. Finally, a possible catalytic mechanism was also proposed through active species trapping experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

Chang¹,

Li²,

Chen³

et al. 2014

Superlattices and Microstructures

View full text Add to dashboard Cite

show abstract

“…[23] The interface between the two oxides can result in electron and hole separation upon photoexcitation which is one of the key factors in efficient photocatalysis. Heterostructures of TiO 2 with metals, [24,25] semiconductors [26,27] and heterostructures of two different metal oxides [28][29][30] have been shown to induce visible light absorption and improved photocatalytic activity when compared with the isolated materials. The formation of a heterostructure of two metal oxides could provide a promising approach for developing materials with improved photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Nolan¹,

Iwaszuk²,

Tada³

2012

Aust. J. Chem.

View full text Add to dashboard Cite

The surface modification of TiO 2 with molecular sized metal oxide clusters has recently been shown to be a promising approach for providing TiO 2 with visible-light activity and/or improved UV activity. This short review summarizes the effects of the surface modification of TiO 2 with the oxides of iron and tin selected from d-and p-blocks, respectively, on the photocatalytic activity. Fe(acac) 3 and [Sn(acac) 2 ]Cl 2 chemisorption on the TiO 2 surface occurs by ligand-exchange and ion-exchange, respectively. Taking advantage of the strong adsorption, we formed extremely small metal oxide clusters on TiO 2 by the chemisorption-calcination cycle (CCC) technique with their loading amount strictly controlled. The iron oxide surface modification of P-25 (anatase/rutile ¼ 4 : 1, w/w, Degussa) gives rise to a high level of visible-light activity and a concomitant increase in the UV-light activity for the degradation of model organic pollutants. On the other hand, only the UV-light activity is increased by the tin oxide surface modification of ST-01 (anatase, Ishihara Sangyo). This striking difference can be rationalized on the basis of the material characterization and DFT calculations, which show that FeO x surface modification of rutile leads to visible-light activity, while SnO 2 -modified anatase enhances only the UV-light activity. We propose the mechanisms behind the FeO x and SnO 2 surface modification, where the surface-to-bulk and bulk-to-surface interfacial electron transfer are taken into account in the former and the latter, respectively.

show abstract

“…However, there are issues with substitutional doping of TiO2, such as dopant incorporation /solubility, stability and charge recombination. Strategies for surface modification of TiO2 shifting the band gap to the visible 20 while improving photocatalytic efficiency are being researched.…”

mentioning

confidence: 99%

“…Metal alignments of the oxides in the heterostructure are postulated to allow visible light absorption and charge separation [18][19][20][21][22][23] . One can conceive of using metal oxide nanoclusters adsorbed at a TiO2 surface as a composite photocatalytic material, with the oxide nanocluster playing a role similar to the dye in a DSCC or 35 the sulphide quantum dot.…”

mentioning

confidence: 99%