In situ ion exchange synthesis of the novel Ag/AgBr/BiOBr hybrid with highly efficient decontamination of pollutants

Cheng, Hefeng; Huang, Baibiao; Wang, Peng; Wang, Zeyan; Lou, Zaizhu; Wang, Junpeng; Qin, Xiaoyan; Zhang, Xiaoyang; Dai, Ying

doi:10.1039/c1cc11525a

Cited by 443 publications

(185 citation statements)

References 26 publications

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“…Copper nitrate (CuBr) microspheres were used in cation exchange reaction with silver nitrate and employed as chemical template, similar to Ag-based compound in anion exchange reaction, which could provide Br − source and then be applied as a matrix for the deposition of AgBr [217]. The drawback of cation exchange reaction is also semblance with anion exchange reaction: single silver halide component is difficult to be obtained as original core materials cannot be removed entirely [218].…”

Section: In Situ Ion Exchangementioning

confidence: 99%

Regulations of silver halide nanostructure and composites on photocatalysis

Fan

Han

Song

et al. 2017

Adv Compos Hybrid Mater

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The silver halides and their corresponding composites would constitute remarkable photocatalytic systems not only in energy production but also in environmental remediation. The major advantage in these silver halides system is that plasma metal Ag 0 species would be spontaneously generated by silver halides under light irradiation, which play dual roles of expanding light absorption range and charge carriers separation. In this tutorial review, the origin and development of silver halides, synthesis methods, construction of composite structures with other materials, photocatalytic applications, and various and controversial mechanisms are all exhaustively described.

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Section: In Situ Ion Exchangementioning

confidence: 99%

Regulations of silver halide nanostructure and composites on photocatalysis

Fan

Han

Song

et al. 2017

Adv Compos Hybrid Mater

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“…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

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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.

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“…No obvious shift associated with BiOBr diffraction peaks was observed in the XRD patterns, suggesting the AgBr or other species were not incorporated into the crystal matrix of the BiOBr. The similar AgBr species were also observed in a Ag/AgBr/BiOBr photocatalysts synthesized using ionexchange synthesis [19], where only methanol was adopted as solvent for photo-reducing AgBr. Considering the methanol/water mixture involved in our case, the Ag species would be AgBr, Ag or Ag oxides if there were, however, such Ag species are mainly associated with cubic rather than tetragonal crystal system.…”

Section: Photocatalytic Activity Measurementmentioning

confidence: 89%

Visible-Light-Driven Photodegradation of Rhodamine B on Ag-Modified BiOBr

Kong

Jiang

et al. 2012

Catal Lett

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Ag-modified BiOBr composite photocatalysts were prepared via a simple phase-transfer methodology and used for cleanup of Rhodamine B (RhB) aqueous solution under visible light irradiation. X-ray diffraction, ultraviolet-visible diffuse reflectance spectra (UV-Vis-DRS) and high resolution X-ray photoelectron spectra characterizations confirmed the Ag-modification significantly affected the optical property, structures and reactivity of the BiOBr-based photocatalysts. In the Ag-modification process, a large portion of Ag ? may extract Br 1-from BiOBr and the as-formed AgBr epitaxially located along the {102} crystal surface of BiOBr. The rest Ag ? will be either photo-reduced by methanol into Ag 0 or form Ag 2 O. In nature, the Ag-modified BiOBr materials are multi-junction photocatalysts of Ag/Ag 2 O/AgBr/BiOBr. The Ag-modification can greatly enhance the absorption of visible light but deteriorates the photocatalytic activity in comparison to the primitive BiOBr in visible-light-driven photodegradation of RhB. The activity of RhB photodegradation on such catalysts is inversely proportional to AgBr loading within 0.2-2.0 wt% region. Such unusual photocatalytic performance was tentatively attributed to the special band structure of the materials.

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In situ ion exchange synthesis of the novel Ag/AgBr/BiOBr hybrid with highly efficient decontamination of pollutants

Cited by 443 publications

References 26 publications

Regulations of silver halide nanostructure and composites on photocatalysis

Regulations of silver halide nanostructure and composites on photocatalysis

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

Visible-Light-Driven Photodegradation of Rhodamine B on Ag-Modified BiOBr

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