Highly efficient visible-light-induced photocatalytic activity of Bi2WO6/BiVO4 heterojunction photocatalysts

Chaiwichian, Saranyoo; Inceesungvorn, Burapat; Wetchakun, Khatcharin; Phanichphant, Sukon; Wetchakun, Natda

doi:10.1016/j.materresbull.2014.03.012

Cited by 53 publications

(18 citation statements)

References 29 publications

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“…It is found that BiVO 4 / Bi 2 WO 6 show better photocatalytic efficiency than that of pure Bi 2 WO 6 and pure BiVO 4 under the same conditions. Moreover, the percentage of photocatalytic degradation of BiVO 4 /Bi 2 WO 6 shows better than the best result of 69 % previous reported [26]. Thence, this result proves that it is possible to prepare photocatalytic material BiVO 4 /Bi 2 WO 6 heterojunction directly from the leaching solution of waste SCR catalyst.…”

Section: Preparation Of Bivo 4 /Bi 2 Wo 6 Heterojunctionmentioning

confidence: 56%

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Huo

Chang

et al. 2014

Waste Biomass Valor

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The catalytic removal of NO x technologies must pay attention to waste selective catalytic reduction (SCR) catalysts, which are the traditional commercial V 2 O 5 -WO 3 / TiO 2 catalysts. Our work focuses on the progress in green reclamation and green chemistry for dealing with the spent SCR catalysts with sustainability perspectives. The problem outlined deals largely with the study of a feasible preparation way for visible-light-sensitive BiVO 4 /Bi 2 WO 6 heterojunction photocatalyst, which was synthesized via a hydrothermal process through waste SCR catalysts. In this paper, the simulated waste SCR catalyst dissolved by sodium hydroxide (NaOH) solution was proposed. V 2 O 5 and WO 3 were dissolved heavily while TiO 2 was rarely dissolved by sodium hydroxide. Afterword, the dissolved vanadium and tungsten in leaching solution were used to produce BiVO 4 /Bi 2 WO 6 heterojunction through a hydrothermal process at 160°C, which can be used as photocatalyst. The photocatalytic performance of the BiVO 4 /Bi 2 WO 6 sample was evaluated by degradation of methylene blue in aqueous solution under visible light irradiation, which attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the heterojunction between Bi 2 WO 6 and BiVO 4 .

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Section: Preparation Of Bivo 4 /Bi 2 Wo 6 Heterojunctionmentioning

confidence: 56%

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Huo

Chang

et al. 2014

Waste Biomass Valor

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“…However this propensity for phase transition is detrimental to the enhancement of these materials' functionality. For example, efforts to enhance the photocatalytic property of tungstates [1][2][3][4], tantalates [5][6][7][8], vanadates [9][10][11][12][13], and titanates [14][15][16][17][18][19][20] are shown to be limited by the vulnerability of transition prone crystalline phases. Evidently, the slightest phase gradient such as a single intrinsic defect can have significant effects on the functionality of a material because it only takes one to be a charge trap that significantly increases the recombination rates.…”

Section: Introductionmentioning

confidence: 99%

Free energy landscape approach to aid pure phase synthesis of transition metal (X=Cr, Mn and Fe) doped bismuth titanate (Bi2Ti2O7)

Mayfield

Huda

2016

Journal of Crystal Growth

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A density functional theory study of Cr, Mn and Fe substitutions in Bi 2 Ti 2 O 7 (BTO) photocatalysts is presented. We performed a stability analysis from our total energy calculations and have determined formations of dopant inspired phases are detrimental to the overall photocatalytic performance of X-doped BTO. From our calculated formation energies and electronic structures it is shown that X substitution of Ti is least stable and should be associated with formation of secondary phases more so than X substitution of Bi. This result contradicts the many experimental studies which suggest transition metal dopants always substitute Ti in BTO, but on the other hand, explains the poor photocatalytic response beyond what has become known as the critical dopant concentration.

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“…Loading noble metal nanoparticles onto the surface of photocatalysts had been proven to help promoting the charge separation and light-harvesting ability, resulting in the improvement of photocatalytic performance significantly [21][22][23][24]. The formation of heterostructure with suitable banding alignment could greatly facilitate the separation of photo-generated electron/hole pairs and suppress their recombination, and hence enhance the photocatalytic activity [25][26][27][28][29][30][31][32]. However, the use of expensive noble metals or the formation of heterostructure via multi-step reaction largely limits their practical application.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel synthesis and enhanced photocatalytic activity of doped bismuth tungsten oxide composite

Wang

et al. 2016

Materials Research Bulletin

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Highly efficient visible-light-induced photocatalytic activity of Bi2WO6/BiVO4 heterojunction photocatalysts

Cited by 53 publications

References 29 publications

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Reuse and Valorization of Vanadium and Tungsten from Waste V2O5–WO3/TiO2 SCR Catalyst

Free energy landscape approach to aid pure phase synthesis of transition metal (X=Cr, Mn and Fe) doped bismuth titanate (Bi2Ti2O7)

Sol–gel synthesis and enhanced photocatalytic activity of doped bismuth tungsten oxide composite

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