Novel ZnFe2O4/WO3, a highly efficient visible-light photocatalytic system operated by a Z-scheme mechanism

Rawal, Sher Bahadur; Kang, Hye Jin; Won, Dong-Il; Lee, Wan In

doi:10.1016/j.apcatb.2019.117856

Cited by 38 publications

(17 citation statements)

References 69 publications

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“…Besides the diffraction peak of BC, BC/ ZnFe 2 O 4 displayed apparent peaks at 29.92°, 35.26°, 42.84°, 53.11°, 56.63°, 62.21°, which fit well with the (220), (311), (400), (422), (511), (440) crystal planes of ZnFe 2 O 4 . [34][35][36] The above facts prove that the preparation of BC/ZnFe 2 O 4 has been realized.…”

Section: Synthesis and Characterization Of Bc/znfe 2 Osupporting

confidence: 52%

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Removal of Cr(VI) from Acid Wastewater by BC/ZnFe₂O₄ Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

et al. 2020

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Photocatalysis is a promising solar energy conversion technology due to its potential applications in water treatment, searching for highly efficient photocatalytic materials is highly desirable. Herein, we have prepared a series of biochar(BC)/ZnFe2O4 magnetic nanocomposites by the calcination‐hydrothermal two‐step method. BC/ZnFe2O4 owns improved photoabsorption from 400 to 1300 nm. PL spectra of BC/ZnFe2O4 shows a weaker intensity compared with BC and ZnFe2O4, and BC/ZnFe2O4 generates a stronger photocurrent density (∼0.08 μA cm−2) than that of BC (0) or ZnFe2O4 (0.03 μA cm−2) under the visible light irradiation, implying efficient separation efficiency of photogeneration carriers. The investigation of pH (3, 5, 7, 9, 11) sensitivity of BC/ZnFe2O4 demonstrates that removal efficiency of Cr(VI) achieves the highest rate at pH=3. Under visible light irradiation, BC/ZnFe2O4 as photocatalyst can remove 80 % Cr(VI), higher than that of BC (0) or ZnFe2O4 (44 %). In addition, BC/ZnFe2O4 composites exhibit excellent cycling stability and can be easily separated for recycling due to its stability and unique magnetic properties. This work has presented a promising strategy in adsorption‐photocatalytic treatment of acidic wastewater containing heavy metals.

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Section: Synthesis and Characterization Of Bc/znfe 2 Osupporting

confidence: 52%

“…ZnFe 2 O 4 shows an obvious visible light absorption edge at~630 nm, due to its band gap with 1.97 eV. [34,37] Interestingly, from 800 nm to 1300 nm, it shows an enhanced photoabsorption. BC exhibits a broad absorption spectrum from 200 nm to 1300 nm, resulting from the scattering of black biochar.…”

Section: Synthesis and Characterization Of Bc/znfe 2 Omentioning

confidence: 99%

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe₂O₄ Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

et al. 2020

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“…the lattice distances of 0.368 and 0.328 nm were associated with the (200) plane of WO 3 and the (002) plane of g-C 3 N 4 , respectively [26,30]. Additionally, the elemental mapping image of the aforementioned material exhibited speci c signs of C, N, W, and O, suggesting that WO 3 and g-C 3 N 4 were well hybridized (Figure 2b).…”

Section: Sample Characteristicsmentioning

confidence: 96%

“…This disadvantage can be overcome by hybridizing the aforementioned semiconductor with other semiconductors [19][20][21][22][23][24]. Tungsten trioxide (WO 3 ) is a prospect semiconductor that can be appropriately hybridized with g-C 3 N 4 to yield a highly e cient WO 3 -g-C 3 N 4 heterostructure for the control of harmful gas-phase pollutants because of its greatly positive valence band (VB) position and harmonic electronic structure, which affords a great oxidation potential [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

High-Performance 3D Semiconductor-Based Heterostructure Photocatalyst in Sustained Control of Harmful Gas-Phase Pollutants Under Visible-Light Illumination

Lee

Bae

2021

Preprint

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Herein, a highly efficient three-dimensional (3D) semiconductor-based heterostructure photocatalyst (i.e., WO3–g-C3N4 monolithic architecture; WOCNM) was developed by immobilizing a WO3–g-C3N4 heterostructure powder on a melamine foam (MF) framework. Subsequently, the sustained control of two harmful model gas-phase pollutants (i.e., n-butanol and o-xylene) over WOCNM and selected monolithic counterparts (i.e., MF-supported WO3 monolith and MF-supported g-C3N4 monolith) was investigated under visible-light irradiation. WOCNM exhibited higher photocatalytic capabilities in the sustained control of the two model pollutants than those of individual WO3 and g-C3N4 monoliths because the WO3–g-C3N4 heterojunction enhanced its charge-separation ability. Notably, WOCNM exhibited highly efficient photocatalytic capabilities in the sustained control of n-butanol (up to 97%) and o-xylene (up to 86%). Moreover, no noticeable changes were observed in the WOCNM photocatalytic capability after the final run of successive applications. The fresh and successively used WOCNMs were nearly identical, and the photocatalyst powder was not observed in the reaction chamber after its successive application. As a result, WOCNM was a highly efficient and stable 3D heterostructure photocatalyst for the sustained control of gas-phase n-butanol and o-xylene, without significant catalyst powder loss. Promisingly, this study will expedite the future development of 3D photocatalysts for the sustained control of harmful gas-phase pollutants.

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“…(1.9 eV). [42,43] Compared with other catalysts (TiO 2 3.2 eV, [44] g-C 3 N 4 2.67 eV [45] ), the band gap of the composite material is narrower, which can effectively absorb light energy. The electrons in the valence band are more easily excited; then it is easier to occur the electron transition, transfer to the conduction band to perform photocatalytic reactions.…”

Section: Morphology and Microstructurementioning

confidence: 99%

Al‐Incorporated Mesoporous Silica Supported ZnFe₂O₄ for Photocatalytic Hydrogen Evolution

et al. 2021

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Non-noble metal photocatalysts have received widespread attention with the popularity of photocatalytic hydrogen evolution. Here, a brand-new series of ZnFe 2 O 4 /Al-MCM-41 photocatalysts were synthesized with a simple hydrothermal strategy and analyzed through various characterizations. The results revealed that 40 % loading of Zinc ferrite (ZnFe 2 O 4 ) showed the most remarkable hydrogen evolution effect without noble metal decorated. It has a maximum photocatalytic hydrogen evolution of 4525.4 μmol g À 1 in 3 h, which is about 5.4 times higher than that of pure ZnFe 2 O 4 . These results are mainly owing to the loading of Al-MCM-41, which can provide more surface reaction sites and delay the recombination of charges and holes. Moreover, the composite shows good cyclability and stability, with a high hydrogen evolution after three repeated cycles.

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Novel ZnFe2O4/WO3, a highly efficient visible-light photocatalytic system operated by a Z-scheme mechanism

Cited by 38 publications

References 69 publications

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe₂O₄ Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe₂O₄ Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

High-Performance 3D Semiconductor-Based Heterostructure Photocatalyst in Sustained Control of Harmful Gas-Phase Pollutants Under Visible-Light Illumination

Al‐Incorporated Mesoporous Silica Supported ZnFe₂O₄ for Photocatalytic Hydrogen Evolution

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Novel ZnFe2O4/WO3, a highly efficient visible-light photocatalytic system operated by a Z-scheme mechanism

Cited by 38 publications

References 69 publications

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe2O4 Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe2O4 Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

High-Performance 3D Semiconductor-Based Heterostructure Photocatalyst in Sustained Control of Harmful Gas-Phase Pollutants Under Visible-Light Illumination

Al‐Incorporated Mesoporous Silica Supported ZnFe2O4 for Photocatalytic Hydrogen Evolution

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Removal of Cr(VI) from Acid Wastewater by BC/ZnFe₂O₄ Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe₂O₄ Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

Al‐Incorporated Mesoporous Silica Supported ZnFe₂O₄ for Photocatalytic Hydrogen Evolution