Core–Shell Heterostructured BiVO4/BiVO4:Eu3+ with Improved Photocatalytic Activity

Shan, Lianwei; Ding, Jun; Sun, Wei; Han, Zhidong; Jin, Lei

doi:10.1007/s10904-017-0638-1

Cited by 12 publications

(13 citation statements)

References 34 publications

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“…Bismuth photocatalytic materials were considered to be a class of highly efficient photocatalytic materials due to their advantages such as narrow band gap width, photocorrosion resistance, and chemical stability (Chen et al, 2014; Li et al, 2018; Li et al, 2018; Long et al, 2015; Meng et al, 2017). As one of the representative materials in the bismuth system, BiVO 4 has the advantages of excellent crystallization, narrow band gap (about 2.40 eV), non‐toxicity, and economy and was regarded as a promising visible light semiconductor catalyst (Shan et al, 2017; Wang et al, 2018). However, pure BiVO 4 still faces the problems of fast photogenerated carrier recombination rate and poor photocatalytic activity (Zachäus et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO₄/Cu/g‐C₃N₄ under visible light irradiation

et al. 2021

Water Environment Research

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A novel BiVO4/Cu/g‐C3N4 heterostructure photocatalyst was synthesized by thermal condensation, hydrothermal, and in situ precipitation method. The microscopic morphology and chemical composition of the synthesized samples were analyzed by XRD, SEM, FT‐IR, XPS, and other characterizations. BiVO4/Cu/g‐C3N4 (BiVO4/Cu:g‐C3N4 mass ratio was 1:1) photocatalyst had the optimal photocatalytic degradation activity for tetracycline (TC) wastewater under visible light irradiation (120 min, 74.8%). The introduction of Cu and Z‐scheme heterojunction was further confirmed by UV‐vis, PL, EIS, and capture mechanism analysis, which effectively accelerated the separation and transfer rate of photogenerated electron holes and enhanced the strong oxidation of h+ and •O2− active species. BiVO4/Cu/g‐C3N4 heterojunction photocatalytic material has potential application value in the removal of refractory pollutants in wastewater. Practitioner points A novel Z‐scheme BiVO4/Cu/g‐C3N4 photocatalyst with excellent photocatalytic activities and stability was prepared to treat tetracycline (TC) wastewater. 1:1 CBCN (BiVO4/Cu:g‐C3N4 mass ratio was 1:1) photocatalyst exhibited the highest photocatalytic performance for TC wastewater. The Z‐scheme heterojunction and Cu act as the interfacial charge transfer medium accelerated the transfer and separation of carriers.

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Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO₄/Cu/g‐C₃N₄ under visible light irradiation

et al. 2021

Water Environment Research

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“…The undoped sample is well indexed to the ICSD-33243, and no extra peaks are observed, suggesting a pure fergusonite type BiVO 4 . Upon doping, the Eu 3+ ions should substitute Bi 3+ ions in BiVO 4 due to their similar ionic radius (Eu 3+ , 94.7 pm and Bi 3+ , 107 pm) and the same valence . For x = 1 mol %, only two tiny characteristic diffraction peaks of zircon-BiVO 4 present at 25° and 33°, which means the fergusonite structure still predominates.…”

Section: Resultsmentioning

confidence: 93%

“…3 Upon doping, the Eu 3+ ions should substitute Bi 3+ ions in BiVO 4 due to their similar ionic radius (Eu 3+ , 94.7 pm and Bi 3+ , 107 pm) and the same valence. 6 For x = 1 mol %, only two tiny characteristic diffraction peaks of zircon-BiVO 4 present at 25°and 33°, which means the fergusonite structure still predominates. Then, a significant structure evolution toward zircon-BiVO 4 is observed upon further inceasing Eu 3+ ions.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

“…Semiconductor photocatalytic technology has been widely used to decompose organic pollutants and other environmental purification. Recently, BiVO 4 has become one photocatalyst of focus owing to its outstanding photocatalytic performance. − As an n-type semiconductor, BiVO 4 can crystallize into three polymorphs, being monoclinic fergusonite phase (fergusonite-BiVO 4 , I 2/ a ), tetragonal zircon phase (zircon-BiVO 4 , I 4 1 / amd ), and tetragonal scheelite phase (scheelite-BiVO 4 , I 4 1 / a ), , as shown in Figure . Fergusonite-BiVO 4 exhibits the best photocatalytic activity because of its narrower band gap (∼2.4 eV), resulting in higher visible-light-driven photoactivity.…”

Section: Introductionmentioning

confidence: 99%

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Increasing Doping Solubility of RE³⁺ Ions in Fergusonite BiVO₄ via Pressure-Induced Phase Transition

et al. 2021

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Eu3+ ions doped bismuth vanadate powders were synthesized by a hydrothermal method, and the effect of Eu3+ ions doping on the crystal structure was investigated by X-ray diffraction (XRD), Raman, and UV–vis diffuse reflectance spectra. XRD and Raman results reveal that the doping solubility of Eu3+ ions in fergusonite-BiVO4 is extremely small. Above 0.5 mol % doping, a structural transition from fergusonite to zircon structure occurs. This phase transition results in band gap enhancement and thus limits its photocatalytic performance. Upon compression, zircon-BiVO4:Eu3+ is not stable, and a zircon-to-scheelite transition presents above 5 GPa. It is noted that this transition is irreversible, and the high-pressure scheelite structure transforms back to the fergusonite structure rather than the original zircon structure after pressure release. The transition sequence of zircon-to-scheelite-to-fergusonite in a compression-decompression cycle for BiVO4:Eu3+ provides one method to synthesize fergusonite-BiVO4:Eu3+ with more doping content. This result confirms that pressure is one effective strategy to access new structures and novel physical properties of functional material.

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“…A great number of attempts have been paid to enhance its photocatalysis via RE doping in BiVO 4 . The reports have manifested that Eu 3+ doping could be a favorite method to enhance the photocatalysis. − Zhang et al prepared Eu 3+ -doped BiVO 4 via the hydrothermal method with a maximum Eu 3+ -doping of 7.30 wt %, which presents the optimal degradation of methyl orange (MO) solution. Xue et al reported that 0.47%Eu/0.59%F-BiVO 4 composite showed an improved performance over the pure sample.…”

Section: Introductionmentioning

confidence: 99%

Manipulating Luminescence and Photocatalytic Activities of BiVO₄ by Eu³⁺ Ions Incorporation

et al. 2020

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BiVO4 was selected as a model to manipulate the luminescence and photocatalysis by Eu3+ ions incorporation. Eu3+-uniformly doped and surface-localized BiVO4 was prepared by a coprecipitation route and cation exchanges, respectively. The phase-formations, surface characteristics, and band structures were measured. A comparative study of photoenergy conversion activities, that is, photocatalysis and photoluminescence, was conducted. Eu3+-surface-localizing on BiVO4 improves both visible light harvest and photodegradation on RhB dye, while, Eu3+-uniformly doping deteriorates the photocatalysis of BiVO4. In Eu3+-uniformly doped BiVO4 nanoparticles, 5D0 → 7F0,1,2,3,4 luminescence quenched in the monoclinic phase, whereas it could be observed in the tetragonal formation. Differently, Eu3+-surface-localized BiVO4 with the monoclinic formation showed both enhanced Eu3+ luminescence and improved photocatalysis. A band model was proposed to discuss the luminescence mechanism. Bi 6s levels could contribute different energy positions in band structures of monoclinic and tetragonal phases, which play a vital role in the photoenergy conversion. Eu3+ ions incorporated in BiVO4 could be used to study multimodal photoenergy models such as photocatalysis and photoluminescence.

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Core–Shell Heterostructured BiVO4/BiVO4:Eu3+ with Improved Photocatalytic Activity

Cited by 12 publications

References 34 publications

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO₄/Cu/g‐C₃N₄ under visible light irradiation

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO₄/Cu/g‐C₃N₄ under visible light irradiation

Increasing Doping Solubility of RE³⁺ Ions in Fergusonite BiVO₄ via Pressure-Induced Phase Transition

Manipulating Luminescence and Photocatalytic Activities of BiVO₄ by Eu³⁺ Ions Incorporation

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Core–Shell Heterostructured BiVO4/BiVO4:Eu3+ with Improved Photocatalytic Activity

Cited by 12 publications

References 34 publications

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO4/Cu/g‐C3N4 under visible light irradiation

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO4/Cu/g‐C3N4 under visible light irradiation

Increasing Doping Solubility of RE3+ Ions in Fergusonite BiVO4 via Pressure-Induced Phase Transition

Manipulating Luminescence and Photocatalytic Activities of BiVO4 by Eu3+ Ions Incorporation

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Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO₄/Cu/g‐C₃N₄ under visible light irradiation

Enhanced photocatalytic degradation activity of Z‐scheme heterojunction BiVO₄/Cu/g‐C₃N₄ under visible light irradiation

Increasing Doping Solubility of RE³⁺ Ions in Fergusonite BiVO₄ via Pressure-Induced Phase Transition

Manipulating Luminescence and Photocatalytic Activities of BiVO₄ by Eu³⁺ Ions Incorporation