Preparation Of ZnO/Co<sub>3</sub>O<sub>4</sub> Hollow Microsphere By Pollen‐biological Template And Its Application In Photocatalytic Degradation

Liu, Yangyang; Zhang, Xin; Wu, Bowen; Zhao, Haoyu; Zhang, Wei; Shan, Congcong; Yang, Ji; Liu, Qing

doi:10.1002/slct.201903620

Cited by 18 publications

(6 citation statements)

References 68 publications

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“…These peaks are related to the zinc lattice in ZnO ( Srivastava et al, 2018 ; Bharti et al, 2021 ; Kohantorabi et al, 2021 ). In addition, the observed spin-orbital split of Zn (between Zn 2p 1/2 and Zn 2p 3/2 ) is about 23 eV, which is in agreement with the reference value of ZnO ( Liu et al, 2019 ; Kohantorabi et al, 2021 ). These results indicated the presence of Zn with +2 oxidation state.…”

Section: Resultssupporting

confidence: 87%

Solar light induced photocatalytic degradation of tetracycline in the presence of ZnO/NiFe2O4/Co3O4 as a new and highly efficient magnetically separable photocatalyst

et al. 2022

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In this study, a new solar light-driven magnetic heterogeneous photocatalyst, denoted as ZnO/NiFe2O4/Co3O4, is successfully prepared. FT-IR, XPS, XRD, VSM, DRS, FESEM, TEM, EDS, elemental mapping, and ICP analysis are accomplished for full characterization of this catalyst. FESEM and TEM analyses of the photocatalyt clearly affirm the formation of a hexagonal structure of ZnO (25–40 nm) and the cubic structure of NiFe2O4 and Co3O4 (10–25 nm). Furthermore, the HRTEM images of the photocatalyst verify some key lattice fringes related to the photocatalyt structure. These data are in very good agreement with XRD analysis results. According to the ICP analysis, the molar ratio of ZnO/NiFe2O4/Co3O4 composite is obtained to be 1:0.75:0.5. Moreover, magnetization measurements reveals that the ZnO/NiFe2O4/Co3O4 has a superparamagnetic behavior with saturation magnetization of 32.38 emu/g. UV-vis DRS analysis indicates that the photocatalyst has a boosted and strong light response. ZnO/NiFe2O4/Co3O4, with band gap energy of about 2.65 eV [estimated according to the Tauc plot of (αhν)2vs. hν], exhibits strong potential towards the efficacious degradation of tetracycline (TC) by natural solar light. It is supposed that the synergistic optical effects between ZnO, NiFe2O4, and Co3O4 species is responsible for the increased photocatalytic performance of this photocatalyst under the optimal conditions (photocatalyst dosage = 0.02 g L−1, TC concentration = 30 mg L−1, pH = 9, irradiation time = 20 min, and TC degradation efficiency = 98%). The kinetic study of this degradation process is evaluated and it is well-matched with the pseudo-first-order kinetics. Based on the radical quenching tests, it can be perceived that •O2− species and holes are the major contributors in such a process, whereas the •OH radicals identify to have no major participation. The application of this methodology is implemented in a facile and low-cost photocatalytic approach to easily degrade TC by using a very low amount of the photocatalyst under natural sunlight source in an air atmosphere. The convenient magnetic isolation and reuse of the photocatalyst, and almost complete mineralization of TC (based on TOC analysis), are surveyed too, which further highlights the operational application of the current method. Notably, this method has the preferred performance among the very few methods reported for the photocatalytic degradation of TC under natural sunlight. It is assumed that the achievements of this photocatalytic method have opened an avenue for sustainable environmental remediation of a broad range of contaminants.

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Section: Resultssupporting

confidence: 87%

Solar light induced photocatalytic degradation of tetracycline in the presence of ZnO/NiFe2O4/Co3O4 as a new and highly efficient magnetically separable photocatalyst

et al. 2022

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“…It clearly demonstrates that the observed degradation efficiency ( %) is 67.2, 71.3, 79.7, 87.1 and 88.8 % for pure CdS, pure Ag 2 O, CA1, CA2 and CA3 respectively. In addition, CdS/Ag 2 O nanocomposite is compared with the previously reported photocatalysts in literatures, and the results are provided in Table S1 …”

Section: Resultsmentioning

confidence: 99%

Solar Induced Photocatalytic Degradation of Methylene Blue by CdS/Ag₂O Nanocomposites

Sophia¹,

Balaji

Peters³

et al. 2020

ChemistrySelect

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Present investigation reports the synthesis of stable as well as visible-light active CdS/Ag 2 O nanocomposite photocatalysts in three varied ratios to be engaged in degradation of methylene blue (MB) dye. As-synthesized photocatalysts have been characterized with the aid of diverse characterization techniques such as X-ray diffraction (XRD), FT-Raman, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), UV-visible and Photoluminescence (PL) spectroscopy, and transmission electron microscopy (TEM). XRD pattern clearly depicts the presence of hexagonal CdS phase and cubic Ag 2 O phase. Results show a remarkable enhancement of photocatalytic activity for MB degradation especially for CdS/Ag 2 O nanocomposite with maximum efficiency up to 88.8 %. Moreover, the effective bandgap of CdS/ Ag 2 O (1 : 2) nanocomposite has been significantly reduced to 1.71 eV from pure CdS (2.15 eV). It can be derived that CdS/ Ag 2 O photocatalysis may be envisaged for treatment of diluted waste water containing organic pollutants. Figure 13. Reusability of CdS/Ag 2 O (1 : 2) nanocomposite for degradation of MB. ChemistrySelectFull Papers

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“…[40][41] The functional material synthesized by the biological template method inherits the morphology and structure of the biological template, and the special morphology and structure enable the functional material to have better performance. Yangyang Liu 42 et al used lotus pollen as a biological template to prepare ZnO/ Co 3 O 4 hollow microspheres by impregnation method. Bowei Wang et al 43 prepared SnO 2 /ZnO gradient porous structure composite material using sunflower stems as a biological template.…”

Section: Methods Of Characterizationmentioning

confidence: 99%

The synthesis of biotemplate‐based Bi₂WO₆/TiO₂ composite photocatalyst for degradation of microcystin

Lin

Zhang

et al. 2021

Int J Applied Ceramic Tech

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Microcystin is a harmful hepatic toxin produced by cyanobacteria, is a serious threat due to its toxicity to water ecosystems, and it is found recently that TiO2 photocatalyst is effective in degradation of microcystin. In this study, hierarchical porous Bi2WO6/ TiO2 composite photocatalysts were synthesized with a novel hydrothermal method by using rice husk as the biological template. The results showed that the original micro‐ and nanopores of rice husk were efficiently replicated by the synthesized porous TiO2 photocatalyst with a specific surface area of 137.09 m2/g, which increased by nearly 100 m2/g over the surface area. SEM, TEM, XRD, and XPS spectra showed that heterogeneous structures were formed by Bi2WO6 and TiO2, with which process the crystal structures of both were not affected. In the meantime, we studied the effect of hierarchical porous TiO2 photo‐catalyst, pure TiO2 photo‐catalyst, Bi2WO6 photo‐catalyst, Bi2WO6/ hierarchical porous TiO2 photo‐catalyst on degradation of 1 mg/L MC‐LR, and the results showed that to use the unique silicon‐carbon structure of rice husk to prepare hierarchical porous TiO2 photo‐catalyst can have the degradation rate of 53.5%, which is higher than that of commercially available TiO2 photo‐catalyst by 13.8%. Compared with a single photo‐catalyst, the photo‐catalytic activity of Bi2WO6/ hierarchical porous TiO2 photo‐catalyst is significantly improved. The optimal mingling amount of Bi2WO6 is 0.2 mol/mol. At this time, the degradation rate of MC‐LR is 85.3%, and the main active substances for degradation are h+ and ·OH. In addition, the degradation process of MC‐LR fit well with the kinetic model of Quasi Primary Reaction. The insight of green synthesis of Bi2WO6/ TiO2 composite photocatalysts for degradation of microcystins was provided by this study.

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Preparation Of ZnO/Co₃O₄ Hollow Microsphere By Pollen‐biological Template And Its Application In Photocatalytic Degradation

Cited by 18 publications

References 68 publications

Solar light induced photocatalytic degradation of tetracycline in the presence of ZnO/NiFe2O4/Co3O4 as a new and highly efficient magnetically separable photocatalyst

Solar light induced photocatalytic degradation of tetracycline in the presence of ZnO/NiFe2O4/Co3O4 as a new and highly efficient magnetically separable photocatalyst

Solar Induced Photocatalytic Degradation of Methylene Blue by CdS/Ag₂O Nanocomposites

The synthesis of biotemplate‐based Bi₂WO₆/TiO₂ composite photocatalyst for degradation of microcystin

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Preparation Of ZnO/Co3O4 Hollow Microsphere By Pollen‐biological Template And Its Application In Photocatalytic Degradation

Cited by 18 publications

References 68 publications

Solar light induced photocatalytic degradation of tetracycline in the presence of ZnO/NiFe2O4/Co3O4 as a new and highly efficient magnetically separable photocatalyst

Solar light induced photocatalytic degradation of tetracycline in the presence of ZnO/NiFe2O4/Co3O4 as a new and highly efficient magnetically separable photocatalyst

Solar Induced Photocatalytic Degradation of Methylene Blue by CdS/Ag2O Nanocomposites

The synthesis of biotemplate‐based Bi2WO6/TiO2 composite photocatalyst for degradation of microcystin

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Product

Resources

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Preparation Of ZnO/Co₃O₄ Hollow Microsphere By Pollen‐biological Template And Its Application In Photocatalytic Degradation

Solar Induced Photocatalytic Degradation of Methylene Blue by CdS/Ag₂O Nanocomposites

The synthesis of biotemplate‐based Bi₂WO₆/TiO₂ composite photocatalyst for degradation of microcystin