Novel 3DOM BiVO<sub>4</sub>/TiO<sub>2</sub> nanocomposites for highly enhanced photocatalytic activity

Zalfani, Meriam; Schueren, Benoit Van der; Hu, Zhi Yi; Rooke, Joanna C.; Bourguiga, R.; Wu, Min; Liu, Yu; Tendeloo, Gustaaf Van; Su, Bao‐Lian

doi:10.1039/c5ta00783f

Cited by 143 publications

(64 citation statements)

References 62 publications

(106 reference statements)

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“…The fabrication of three dimensionally ordered macroporous (3DOM) titania was achieved via a templating strategy, according to our previous report [63]. Using the same strategy, ZnO QDs@3DOM TiO 2 was synthesized.…”

Section: Fabrication Of Zno Qds@3dom Tio 2 Nanocompositesmentioning

confidence: 99%

“…As a result, the efficiency of 3DOM Ag/ZnO-TiO 2 composite for degradation of organic pollutants was significantly improved. More importantly, uniformly ordered macroporous materials with pore size in the optical wavelength range can produce peculiar optical effects which enhance the efficiency of light energy conversion [52,53,[56][57][58], being beneficial for photocatalysis [59][60][61][62][63][64].…”

Section: Introductionmentioning

confidence: 99%

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ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

Zalfani

Schueren

Mahdouani

et al. 2016

Applied Catalysis B: Environmental

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Section: Fabrication Of Zno Qds@3dom Tio 2 Nanocompositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

Zalfani

Schueren

Mahdouani

et al. 2016

Applied Catalysis B: Environmental

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“…The well-matched energy band alignement is a key factor for the achievement of efficient heterojunctions [24,25]. Recently the BiVO 4 /TiO 2 heterojunction has been attracted considerable attention as a promising photocatalyst under visible light irradiation and has shown a significant suppression of the photogenerated electron-hole recombination [26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

BiVO4/3DOM TiO2 nanocomposites: Effect of BiVO4 as highly efficient visible light sensitizer for highly improved visible light photocatalytic activity in the degradation of dye pollutants

Zalfani

et al. 2017

Applied Catalysis B: Environmental

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The effect of the amount of BiVO 4 as visible light sensitizer on the photocatalytic activity of BiVO 4 /3DOM TiO 2 nanocomposites was highlighted. The low amount of BiVO 4 nanoparticles favors the transfer of photogenerated electrons to 3DOM TiO 2 while photogenerated electrons will remain at the surface of BiVO 4 at high amount of BiVO 4 , leading to the recombination of electrons-holes and reduced photocatalytic activity. 1 0 0.6 0.4 0.2 0.08 0.04 0.0209 0.0381 0.0256 0.0152 0.110 0.0078 0.0062 100 75 50 25 10 5 0 0.040 0.035 0.030 0.025 0.020 0.015 0.010 0.005 0.000 Rate Constant (min -1 ) mol % BiVO 4 -1 0 1 2 3 E (NHE) CB VB O 2 /O 2 .-OH . /H 2 O Oxidation Highlights -BiVO 4 @3DOM TiO 2 exhibit highly enhanced visible light photocatalytic activity -The effect of the amount of BiVO 4 as visible light sensitizer is highlighted -The electronic interactions BiVO 4 /TiO 2 lead to an improved charge separation -High BiVO 4 content leads to the accumulation of the electron/hole pairs at the surface of the BiVO 4 4 Abstract A series of BiVO 4 /3DOM TiO 2 nanocomposites have been synthesized and their photocatalytic activity was investigated under visible light irradiation using the RhB dye as model pollutant molecule in an aqueous solution. The effect of the amount of BiVO 4 as visible light sensitizer on the photocatalytic activity of BiVO 4 /3DOM TiO 2 nanocomposites was highlighted. The heterostructured composite system leads to much higher photocatalytic efficiencies than bare 3DOM TiO 2 and BiVO 4 nanoparticles. As the proportion of BiVO 4 in BiVO 4 /3DOM TiO 2 nanocomposites increases from 0.04 to 0.6, the photocatalytic performance of the BiVO 4 /3DOM TiO 2 nanocomposites increases and then decreases after reaching a maximum at 0.2. This improvement in photocatalytic perfomance is related to 1) the interfacial electron transfer efficiency between the coupled materials, 2) the 3DOM TiO 2 inverse opal structure with interconnected pores providing an easy mass transfer of the reactant molecules and high accessibility to the active sites and large surface area and 3) the effect of light sensitizer of BiVO 4 . Intensive studies on structural, textural, optical and surface properties reveal that the electronic interactions between BiVO 4 and TiO 2 lead to an improved charge separation of the coupled BiVO 4 /TiO 2 system. The photogenerated charge carrier densities increase with increasing the BiVO 4 content, which acts as visible light sensitizer to the TiO 2 and is responsible for the enhancement in the rate of photocatalytic degradation. However, the photocatalytic activity is reduced when the BiVO 4 amount is much higher than that of 3DOM TiO 2 . Two reasons could account for this behavior. First, with increasing BiVO 4 content, the photogenerated electron/hole pairs are accumulated at the surface of the BiVO 4 nanoparticles and the recombination rate increases as shown by the PL results. Second, decreasing the amount of 3DOM TiO 2 in the nanocomposite decreases the surface area as shown by the BET results. Mo...

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“…A series of 3DOM semiconductors including TiO2 [49][50][51] , WO3 [52,53] , InVO4 [54][55][56] , BiVO4 [57][58][59] , and g-C3N4 [35] have been fabricated and applied in the degradation of organic pollutants and the production of hydrogen and/or oxygen from water splitting.…”

Section: Introductionmentioning

confidence: 99%

Ternary CdS/Au/3DOM-SrTiO 3 composites with synergistic enhancement for hydrogen production from visible-light photocatalytic water splitting

Chang

Zhang

et al. 2017

Applied Catalysis B: Environmental

101

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New ternary composites based on three dimensionally ordered macroporous (3DOM) SrTiO3 (CdS/Au/3DOM-SrTiO3) were prepared and used as photocatalysts in visible light (λ > 420 nm) photocatalytic water splitting for hydrogen evolution.Through optimizing the pore size of 3DOM-SrTiO3 materials and the loading amounts of Au and CdS, CdS/Au/3DOM-SrTiO3(300), templated by 300 nm sized poly(methyl methacrylate) colloids, was found to exhibit a remarkably enhanced photocatalytic hydrogen evolution rate (2.74 mmol/h•g), which was 3.2 times as high as that of CdS/Au/C-SrTiO3 catalyst based on commercial SrTiO3. This notably enhanced photocatalytic performance was mainly attributed to the slow photon enhancement effect of 3DOM-SrTiO3(300) material, which significantly promoted the light harvesting efficiency of ternary composite for the slow photon region of 3DOM-SrTiO3(300) was well matched with the optical absorption band of photocatalyst. Further depositing Pt nanoparticles on CdS/Au/3DOM-SrTiO3(300) composite as a co-catalyst, an extraordinarily high hydrogen evolution rate (up to 5.46 mmol/g•h) and apparent quantum efficiency (42.2% at 420 nm) were achieved because of the synergistic effect of efficient carrier separation, Au SPR effect, and slow photon effect. Furthermore, these ternary CdS/Au/3DOM-SrTiO3 composite photocatalysts were very stable and could be easily recycled four times in visible light photocatalytic water splitting experiments without any loss in activity.3 Keywords Three-dimensionally ordered macroporous material; CdS/Au/3DOM-SrTiO3; Ternary composite; Hydrogen production from water splitting; Slow photon effect.4

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Novel 3DOM BiVO₄/TiO₂ nanocomposites for highly enhanced photocatalytic activity

Cited by 143 publications

References 62 publications

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

BiVO4/3DOM TiO2 nanocomposites: Effect of BiVO4 as highly efficient visible light sensitizer for highly improved visible light photocatalytic activity in the degradation of dye pollutants

Ternary CdS/Au/3DOM-SrTiO 3 composites with synergistic enhancement for hydrogen production from visible-light photocatalytic water splitting

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Novel 3DOM BiVO4/TiO2 nanocomposites for highly enhanced photocatalytic activity

Cited by 143 publications

References 62 publications

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

BiVO4/3DOM TiO2 nanocomposites: Effect of BiVO4 as highly efficient visible light sensitizer for highly improved visible light photocatalytic activity in the degradation of dye pollutants

Ternary CdS/Au/3DOM-SrTiO 3 composites with synergistic enhancement for hydrogen production from visible-light photocatalytic water splitting

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Novel 3DOM BiVO₄/TiO₂ nanocomposites for highly enhanced photocatalytic activity