Investigation of the structural, magnetic and dielectric properties of Mn-doped Bi2Fe4O9 produced by reverse chemical co-precipitation

Pooladi, Mohsen; Shokrollahi, H.; Lavasani, S.A.N.H.; Yang, Haibo

doi:10.1016/j.matchemphys.2019.02.076

Cited by 59 publications

(23 citation statements)

References 44 publications

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“…The weak peaks at 157.0 and 162.3 eV are characterized as Bi 4f 7/2 and Bi 4f 5/2 signals of metallic Bi 0 species, implying the formation of Bi nanoparticles on the surface of BiOCl nanoplates [56]. The O 1s core-level spectrum presents two peaks at 529.0, and 530.5 eV, which are ascribed to the lattice oxygen of BiOCl crystals and chemisorbed oxygen species, respectively [56][57][58]. The existence of Cl − species is confirmed by the observation of two peaks at 197.1 (Cl 2p 3/2 ) and 198.6 (Cl 2p 1/2 ) on the Cl 2p core-level spectrum [56].…”

Section: Catalysts 2019 9 X For Peer Review 3 Of 21mentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4 reduction method. By varying the NaBH4 concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4 concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4 solution treatment. At low-concentration NaBH4 solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4 solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3 nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4 treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.

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Section: Catalysts 2019 9 X For Peer Review 3 Of 21mentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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“…Figure c shows that the binding energy peaks at 142.95 and 138.09 eV are corresponding to Pb 4f 5/2 and Pb 4f 7/2 of PbBiO 2 Br/ZnO and PbBiO 2 Br, which could be from Pb 2+ atoms . Two strong binding energy peaks are observed in Figure d; they are located at 159.0 and 164.4 eV and are attributed to Bi 4f 7/2 and Bi 4f 5/2 , respectively, that indicate the presence of Bi 3+ in the PbBiO 2 Br/ZnO and PbBiO 2 Br materials . Figure e shows the Br 3d XPS spectra of the PbBiO 2 Br/ZnO and PbBiO 2 Br, where the characteristic binding energy peaks located at 68.48 and 69.45 eV are attributed to Br 3d 3/2 and Br 3d 5/2 , respectively.…”

Section: Resultsmentioning

confidence: 91%

One‐Step Construction of Novel PbBiO₂Br/ZnO Heterojunction Composites with Enhanced Photocatalytic Activity

Xia

et al. 2019

Physica Status Solidi (a)

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PbBiO2Br/ZnO heterojunction composites are synthesized using a one‐step method. The as‐synthesized samples are characterized by X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), field‐emission scanning electron microscopy (FE‐SEM), energy‐disperse X‐ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), ultraviolet‐visible diffuse reflectance spectroscopy (UV‐vis DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of the PbBiO2Br/ZnO heterojunction composites is assessed by measuring the removal of methyl orange (MO) from wastewater under simulated sunlight irradiation. The results demonstrate that the PbBiO2Br/ZnO heterojunction composites are composed of ZnO nanorods and PbBiO2Br cubic nanosheets. The PbBiO2Br/ZnO heterojunction composites exhibit enhanced photocatalytic performances for the degradation of MO under irradiation by simulated sunlight. Among the composites, the 10% PbBiO2Br/ZnO composite exhibits optimal activity, and the removal percentage of the dye reaches 92.1% after 60 min of reaction. This is mainly attributed to the efficient separation of photo‐generated e−–h+ pairs and the formation of heterojunctions. According to the active species trapping experiments, photo‐generated h+ is confirmed to be the main active species, whereas ·boldObold2bold− and ·OH play a secondary role in the reaction process. Additionally, the recycling experiments suggest that the PbBiO2Br/ZnO composites have good stability in the reaction process.

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“…As shown in the XPS spectrum of O 1s (Fig. 5c), the obvious peak located at 529.6 eV is attributed to the lattice oxygen and the shoulder peak at 531.3 eV belongs to the chemisorbed oxygen of surface vacancies [64]. For the XPS spectrum of C 1s (Fig.…”

Section: Xps Analysismentioning

confidence: 82%

Photo-Fenton Degradation of AO7 and Photocatalytic Reduction of Cr(VI) over CQD-Decorated BiFeO3 Nanoparticles Under Visible and NIR Light Irradiation

Tang

Sun

et al. 2019

Nanoscale Res Lett

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In this work, the carbon quantum dot (CQD)-decorated BiFeO 3 nanoparticle photocatalysts were prepared by a hydrothermal method. The TEM observation and XPS characterization indicate that the CQDs are well anchored on the surface of BiFeO 3 nanoparticles. Acid orange 7 (AO7) and hexavalent chromium (Cr(VI)) were chosen as the model pollutants to investigate the photocatalytic/photo-Fenton degradation and photocatalytic reduction performances of the as-prepared CQD/BiFeO 3 composites under visible and near-infrared (NIR) light irradiation. Compared with bare BiFeO 3 nanoparticles, the CQD/BiFeO 3 composites exhibit significantly improved photocatalytic and photo-Fenton catalytic activities. Moreover, the composites possess good catalytic stability. The efficient photogenerated charges separation in the composites was demonstrated by the photocurrent response and electrochemical impedance spectroscopy (EIS) measurements. The main active species involved in the catalytic degradation reaction were clarified by radicals trapping and detection experiments. The underlying photocatalytic and photo-Fenton mechanisms are systematically investigated and discussed.

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Investigation of the structural, magnetic and dielectric properties of Mn-doped Bi2Fe4O9 produced by reverse chemical co-precipitation

Cited by 59 publications

References 44 publications

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

One‐Step Construction of Novel PbBiO₂Br/ZnO Heterojunction Composites with Enhanced Photocatalytic Activity

Photo-Fenton Degradation of AO7 and Photocatalytic Reduction of Cr(VI) over CQD-Decorated BiFeO3 Nanoparticles Under Visible and NIR Light Irradiation

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Investigation of the structural, magnetic and dielectric properties of Mn-doped Bi2Fe4O9 produced by reverse chemical co-precipitation

Cited by 59 publications

References 44 publications

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

One‐Step Construction of Novel PbBiO2Br/ZnO Heterojunction Composites with Enhanced Photocatalytic Activity

Photo-Fenton Degradation of AO7 and Photocatalytic Reduction of Cr(VI) over CQD-Decorated BiFeO3 Nanoparticles Under Visible and NIR Light Irradiation

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One‐Step Construction of Novel PbBiO₂Br/ZnO Heterojunction Composites with Enhanced Photocatalytic Activity