Synthesis of octahedral-like ZnO/ZnFe2O4 heterojunction photocatalysts with superior photocatalytic activity

Kuang, Meng; Zhang, Jinjun; Wang, Wenjun; Chen, Jihao; Liu, Ruirui; Xie, Shuai; Wang, Jing; Ji, Zhijiang

doi:10.1016/j.solidstatesciences.2019.05.012

Cited by 56 publications

(18 citation statements)

References 51 publications

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“…Subsequently, the electrons and holes can be respectively generated in the conduction band (À 0.95 eV) and valence band (1.02 eV) of ZnFe 2 O 4 . [15,63] In the process of Cr(VI) selective reduction, when BC/ZnFe 2 O 4 was diffused into Cr(VI) solution, the majority of Cr(VI) was selectively absorbed by surface-active site from BC. Under the visible light irradiation, electrons were produced in ZnFe 2 O 4 , and then flow into BC, meanwhile absorbed Cr(VI) can be rapidly reduced to Cr(III) by electrons.…”

Section: Photocatalytic Mechanismsmentioning

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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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: Photocatalytic Mechanismsmentioning

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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“…In addition, because of its magnetic properties, it can be recovered from solution by an external magnet, which makes it have great potential in practical application. The formation of ZnO/ZF heterojunction can inhibit the recombination of photogenerated electron–hole pairs and improve photocatalytic performance [ 37 – 41 ]. M. Kuang et al [ 37 ] prepared octahedral-like ZnO/ZnFe 2 O 4 heterojunction photocatalyst by solvothermal method.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of ZnO/ZF heterojunction can inhibit the recombination of photogenerated electron–hole pairs and improve photocatalytic performance [ 37 – 41 ]. M. Kuang et al [ 37 ] prepared octahedral-like ZnO/ZnFe 2 O 4 heterojunction photocatalyst by solvothermal method. The photocatalytic activity of different samples was evaluated by degradation of Methylene blue.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of magnetic ZnO/ZnFe2O4/diatomite composites: improved photocatalytic efficiency under visible light irradiation

Limei

Liang

Wang

2022

J Mater Sci: Mater Electron

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The magnetic recoverable ZnO/ZnFe 2 O 4 /diatomite (ZZFDT) composite was synthesized by hydrothermal-precipitation method. The structure, optical properties and magnetic properties of the composites were characterized by different analytical instruments. ZZFDT-1 is composed of cubic spinel, hexagonal wurtzite, tetrahedron structure. SEM and TEM showed that ZnO and ZnFe 2 O 4 particles were loaded onto the surface of diatomite, and the particle size was uniform. In addition, ZZFDT-1 is a typical mesoporous material with a specific surface area of 65.3 m 2 /g and pore size of about 12 nm. The response range of ZZFDT-1 is extended to visible light, and the band gap is 1.5 eV. Moreover, the M–H hysteretic curves of ZZFDT-1 exhibited superparamagnetic properties. The photocatalytic activity of different samples was evaluated by the conversion rate of oxytetracycline (OTC) under visible light. ZZFDT-1 has the best photocatalytic activity and the conversion is up to 95%. Because of its magnetic nature, it can be easily separated from the solution. The results showed that the ZZFDT composite has good photocatalytic activity under visible light. After being reused six times, it still has good stability.

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“…The peak at 725.1 eV with two satellite peaks located at 719.0 and 732.1 eV indicates the existence of Fe 3+ . 47 The O 1s spectrum shown in Figure 2d can be deconvoluted into three peaks. The peak at 530.3 eV is attributed to the metal−oxygen bond, and the two peaks at 532.1 and 533.7 eV can be ascribed to surface adsorbed oxygen species such as H 2 O and O 2 .…”

Section: Introductionmentioning

confidence: 99%

Pt and ZnFe₂O₄ Nanoparticles Immobilized on Carbon for the Detection of Glutathione

Bian

Liu

et al. 2021

ACS Appl. Nano Mater.

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The catalytic activity of nanozymes has attracted much attention in biochemical analyses and the antibiosis and environmental fields. However, easy aggregation and difficulty in recycling greatly result in a decrease of their catalytic activity and further restrict their practical application. Herein, we immobilized Pt and ZnFe 2 O 4 nanoparticles on poplar-wood-derived carbon (ZnFe 2 O 4 /C), which exhibited excellent peroxidase-like activity and high affinity toward H 2 O 2 and 3,3′,5,5′-tetramethylbenzidine (TMB). Moreover, it could be easily separated by an external magnetic force from the reaction system. A sensitive and selective colorimetric sensor for glutathione (GSH) was established based on Pt/ZnFe 2 O 4 /C nanoperoxidase. The linear range for GSH was from 1 to 30 μM, and the limit of detection for GSH was calculated as 0.38 μM. The colorimetric method was applied to determine GSH in real samples for injection.

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Synthesis of octahedral-like ZnO/ZnFe2O4 heterojunction photocatalysts with superior photocatalytic activity

Cited by 56 publications

References 51 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

Fabrication of magnetic ZnO/ZnFe2O4/diatomite composites: improved photocatalytic efficiency under visible light irradiation

Pt and ZnFe₂O₄ Nanoparticles Immobilized on Carbon for the Detection of Glutathione

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Synthesis of octahedral-like ZnO/ZnFe2O4 heterojunction photocatalysts with superior photocatalytic activity

Cited by 56 publications

References 51 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

Fabrication of magnetic ZnO/ZnFe2O4/diatomite composites: improved photocatalytic efficiency under visible light irradiation

Pt and ZnFe2O4 Nanoparticles Immobilized on Carbon for the Detection of Glutathione

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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

Pt and ZnFe₂O₄ Nanoparticles Immobilized on Carbon for the Detection of Glutathione