Novel Z-scheme LaVO4/Bi3O4Cl heterojunctions for highly efficient degradation of ofloxacin under visible light irradiation

Zhang, Mou; Xu, Jun; Chen, Mindong

doi:10.1016/j.jallcom.2022.166653

Cited by 16 publications

(5 citation statements)

References 70 publications

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“…Subsequent radical attack forms product O13 (m/z = 251). The results are in agreement with previous findings [ 64 ]. The repeated attacks by the reactive oxygen species leads to formation of lower molecular weight aliphatic molecules, and mineralization in the longer run.…”

Section: Resultssupporting

confidence: 94%

Constructing a Visible-Active CoFe2O4@Bi2O3/NiO Nanoheterojunction as Magnetically Recoverable Photocatalyst with Boosted Ofloxacin Degradation Efficiency

et al. 2022

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Constructing visible-light-active Z-scheme heterojunctions has proven fruitful in enhancing the photocatalytic activity of photocatalysts for superior water clean-up. Herein, we report the fabrication of a CoFe2O4@Bi2O3/NiO (CBN) Z-scheme nanoheterojunction. The obtained CBN heterojunction was used for visible-light-assisted degradation of ofloxacin (OFL) in water. The OFL degradation efficiency achieved by the CBN heterojunction was 95.2% in 90 min with a rate constant of kapp = 0.03316 min−1, which was about eight times that of NiO and thirty times that of CoFe2O4. The photocatalytic activity of a Bi2O3/NiO Z-scheme heterojunction was greatly enhanced by the visible activity and redox mediator effect of the cobalt ferrite co-catalyst. Higher charge-carrier separation, more visible-light capture, and the Z-scheme mechanism in the Z-scheme system were the important reasons for the high performance of CBN. The scavenging experiments suggested ●O2− as an active species for superior OFL degradation. The possible OFL degradation pathway was predicted based on LC-MS findings of degradation intermediate products. The magnetic nature of the CBN helped in the recovery of the catalyst after reuse for six cycles. This work provides new insights into designing oxide-based heterojunctions with high visible-light activity, magnetic character, and high redox capabilities for potential practical applications in environmental treatment.

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Section: Resultssupporting

confidence: 94%

Constructing a Visible-Active CoFe2O4@Bi2O3/NiO Nanoheterojunction as Magnetically Recoverable Photocatalyst with Boosted Ofloxacin Degradation Efficiency

et al. 2022

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“…The resulting PL spectra are shown in Figure 8 . PL emission primarily originates from the recombination of photogenerated carriers [ 55 ]. Both composites exhibited an emission peak at approximately 350 nm, whereas other researchers have reported emission peaks at 380 nm, 382 nm, 369–374 nm, and 400 nm in their respective studies [ 32 , 36 , 43 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

Advanced Photodegradation of Azo Dye Methyl Orange Using H2O2-Activated Fe3O4@SiO2@ZnO Composite under UV Treatment

Makota,

Dutková,

Briančin

et al. 2024

Molecules

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The Fe3O4@SiO2@ZnO composite was synthesized via the simultaneous deposition of SiO2 and ZnO onto pre-prepared Fe3O4 nanoparticles. Physicochemical methods (TEM, EDXS, XRD, SEM, FTIR, PL, zeta potential measurements, and low-temperature nitrogen adsorption/desorption) revealed that the simultaneous deposition onto magnetite surfaces, up to 18 nm in size, results in the formation of an amorphous shell composed of a mixture of zinc and silicon oxides. This composite underwent modification to form Fe3O4@SiO2@ZnO*, achieved by activation with H2O2. The modified composite retained its structural integrity, but its surface groups underwent significant changes, exhibiting pronounced catalytic activity in the photodegradation of methyl orange under UV irradiation. It was capable of degrading 96% of this azo dye in 240 min, compared to the initial Fe3O4@SiO2@ZnO composite, which could remove only 11% under identical conditions. Fe3O4@SiO2@ZnO* demonstrated robust stability after three cycles of use in dye photodegradation. Furthermore, Fe3O4@SiO2@ZnO* exhibited decreased PL intensity, indicating an enhanced efficiency in electron-hole pair separation and a reduced recombination rate in the modified composite. The activation process diminishes the electron-hole (e−)/(h+) recombination and generates the potent oxidizing species, hydroxyl radicals (OH˙), on the photocatalyst surface, thereby playing a crucial role in the enhanced photodegradation efficiency of methyl orange with Fe3O4@SiO2@ZnO*.

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“…In the quest to eliminate deadly contaminants like ofloxacin (OFL), photocatalysis has emerged as a highly efficient, ecofriendly, easily handled, and cost-effective method for degrading organic pollutants. 1,2 Spinel CoCr 2 O 4 (space group Fd3m) 3 shows good magnetic and photonic behaviors and is sensitive to the cation concentration and coordination states of the crystal lattice. 4,5 For example, in contrast to the spinel phase, inverse spinel CoCr 2 O 4 has half of Cr 3+ filling octahedral positions, and all Co 2+ ions occupy octahedral positions, 4,6 providing the possibility to tailor the photocatalytic performance through phase transition.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the quest to eliminate deadly contaminants like ofloxacin (OFL), photocatalysis has emerged as a highly efficient, eco-friendly, easily handled, and cost-effective method for degrading organic pollutants. , Spinel CoCr 2 O 4 (space group Fd3m ) shows good magnetic and photonic behaviors and is sensitive to the cation concentration and coordination states of the crystal lattice. , For example, in contrast to the spinel phase, inverse spinel CoCr 2 O 4 has half of Cr 3+ filling octahedral positions, and all Co 2+ ions occupy octahedral positions, , providing the possibility to tailor the photocatalytic performance through phase transition . In addition, inverse spinel CoCr 2 O 4 displays higher polarization and magnetic anisotropy in the lattice due to an asymmetric charge distribution within the crystal structure, which facilitates easy catalyst recovery via an external magnetic field, enhancing photocatalytic activity and effectively eliminating nanoparticle aggregation at the same time …”

Section: Introductionmentioning

confidence: 99%

Spinel Phase Engineering Boosted Visible-Light Photocatalytic Activity in Co_1–xSr_xCr₂O₄

Chen,

Gao,

Zhang

2024

Langmuir

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We synthesized Sr-doped spinel CoCr 2 O 4 using the solution combustion method and characterized the structure, morphology, chemical state, and photocatalytic properties through different techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and electrochemical impedance spectroscopy (EIS). 30−50 nm cuboid CoCr 2 O 4 nanocrystals with Sr doping levels ranging from 0 to 0.6% were obtained; the increasing Sr doping deformed the coordination number of Co and Cr, transitioning to octahedral and tetrahedral units, inducing the phase transition from spinel to inverse spinel at 0.6% Sr content. This modification enhanced optical absorption, reduced the energy band gap, increased photoluminescence intensity, and maintained a high-spin state with oxygen vacancies. 0.6% Sr-doped CoCr 2 O 4 demonstrated the highest photocatalytic efficiency at 93%. The XRD structure and photocatalytic activity remained at 87% over 7 cycles after 14 h. Employing degradation pathways and Mott−Schottky curves elucidated the enhancement mechanism.

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Novel Z-scheme LaVO4/Bi3O4Cl heterojunctions for highly efficient degradation of ofloxacin under visible light irradiation

Cited by 16 publications

References 70 publications

Constructing a Visible-Active CoFe2O4@Bi2O3/NiO Nanoheterojunction as Magnetically Recoverable Photocatalyst with Boosted Ofloxacin Degradation Efficiency

Constructing a Visible-Active CoFe2O4@Bi2O3/NiO Nanoheterojunction as Magnetically Recoverable Photocatalyst with Boosted Ofloxacin Degradation Efficiency

Advanced Photodegradation of Azo Dye Methyl Orange Using H2O2-Activated Fe3O4@SiO2@ZnO Composite under UV Treatment

Spinel Phase Engineering Boosted Visible-Light Photocatalytic Activity in Co_1–xSr_xCr₂O₄

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Novel Z-scheme LaVO4/Bi3O4Cl heterojunctions for highly efficient degradation of ofloxacin under visible light irradiation

Cited by 16 publications

References 70 publications

Constructing a Visible-Active CoFe2O4@Bi2O3/NiO Nanoheterojunction as Magnetically Recoverable Photocatalyst with Boosted Ofloxacin Degradation Efficiency

Constructing a Visible-Active CoFe2O4@Bi2O3/NiO Nanoheterojunction as Magnetically Recoverable Photocatalyst with Boosted Ofloxacin Degradation Efficiency

Advanced Photodegradation of Azo Dye Methyl Orange Using H2O2-Activated Fe3O4@SiO2@ZnO Composite under UV Treatment

Spinel Phase Engineering Boosted Visible-Light Photocatalytic Activity in Co1–xSrxCr2O4

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Spinel Phase Engineering Boosted Visible-Light Photocatalytic Activity in Co_1–xSr_xCr₂O₄