Enhanced visible-light responsive photocatalytic activity of Bi25FeO40/Bi2Fe4O9 composites and mechanism investigation

Wang, Geming; Cheng, Da Long; He, Tiancheng; Hu, Yiyu; Deng, Quanrong; Mao, Yangwu; Wang, Shenggao

doi:10.1007/s10854-019-01436-4

Cited by 40 publications

(29 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of secondary phases such as Bi 2 O 3 , Bi 25 FeO 39 , and Bi 2 Fe 4 O 9 is typical during the crystallization of BFO because of the phase formation's kinetics. 49 While the literature suggests that such secondary phases can also possess interesting photocatalytic properties, 50,51 our results indicate only the presence of pure BFO phase. As discussed in the Introduction section, the band gap energy (E g ) can play an important role in photocatalytic membrane performances.…”

Section: ■ Results and Discussionmentioning

confidence: 54%

Reusable BiFeO₃ Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Fourmont

Nechache

Cloutier

2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

We report on electrospinning-assisted fabrication of highly efficient and reusable BiFeO 3 nanofiber-based membranes for photo-activated organic pollutant removal with negligible colloidal release. For validation purposes, we exploit a fluorescent rhodamine B (RhB)-doped solution photo-degraded using visible and infrared illumination (λ ≥ 400 nm) from a solar simulator. As such, pollutant degradation can be directly monitored in real time. Fabrication yields an outstanding control of the fibers' morphology, and metal-enhanced photocatalytic properties are achieved by coating the nanofiber membranes with few nanometers of platinum using sputtering technique. This chemical-free functionalization of the nanofibers allows rapid and efficient RhB degradation. After optimization, 2.4 mg of photocatalyst achieves 93% removal after 150 min under solar illumination, which is impressively more efficient compared with previous reports. Most importantly, the colloidal release-free photocatalysis activity coupled to a manufacturing-ready fabrication process makes it ideal for large-scale deployment using industrial grade equipment.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 54%

Reusable BiFeO₃ Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Fourmont

Nechache

Cloutier

2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The FTIR spectra of the samples are shown in figure 5. The three absorption bands in the 400-700 cm −1 regions of the Bi 25 FeO 40 samples are associated with typical absorption bands for Bi-O and Fe-O [1]. The firm absorptive peaks at 461 and 522 cm −1 are associated with the Bi-O vibration mode.…”

Section: Structural Analysismentioning

confidence: 73%

“…-The diffraction peak of Bi 2 Fe 4 O 9 at approximately q =  2 29.8 corresponded to the (002) crystalline orientation [1]. [9].…”

Section: Structural Analysismentioning

confidence: 98%

“…Because bismuth ferrite possesses both magnetic and photocatalytic properties, it has generated significant interest. It presents many different crystal structures such as perovskite (BiFeO 3 ), sillenite (Bi 25 FeO 40 ), mullite (Bi 2 Fe 4 O 9 ), and composite (Bi 25 FeO 40 /Bi 2 Fe 4 O 9 ) structures [1][2][3]. The Bi 25 FeO 40 and Bi 2 Fe 4 O 9 structures are generally impurity phases in synthesized BiFeO 3 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural, optical, and magnetic properties and specific absorption rate of bismuth ferrite/SiO₂ nanoparticles

Juwita

Sulistiani

Darmawan

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

In this study, the microstructural, optical, and magnetic properties and specific absorption rate (SAR) of bismuth ferrite/SiO2 nanoparticles were successfully investigated. The coprecipitation method was used to synthesize the nanoparticles. X-ray diffraction patterns showed the presence of sillenite-type Bi25FeO40 with a body-centered cubic structure. The crystallite size of Bi25FeO40 was 35.0 nm, which increased to 41.5 nm after SiO2 encapsulation. Transmission electron microscopy images confirmed that all samples were polycrystalline. The presence of Si–O–Si (siloxane) stretching at 1089 cm−1 in Fourier transform infrared spectra confirmed the encapsulation of SiO2. Magnetic measurements at room temperature indicated weak ferromagnetic properties of the samples. The coercivity of the bismuth ferrite nanoparticles was 78 Oe, which increased after SiO2 encapsulation. In contrast, their maximum magnetization, 0.54 emu g−1, reduced after SiO2 encapsulation. The determined bandgap energy of the bismuth ferrite nanoparticles was approximately 2.1 eV, which increased to 2.7 eV after SiO2 encapsulation. The effect of SiO2 encapsulation on the SAR of the samples was investigated using a calorimetric method. The SAR values of the bismuth ferrite nanoparticles were 49, 61, and 84 mW g−1 under alternating magnetic field (AMF) strengths of 150, 200, and 250 Oe, respectively, which decreased after SiO2 encapsulation. The maximum magnetization and the AMF strength influenced the SAR of the nanoparticles. The results showed that SiO2 has a significant effect in determining the microstructural, optical, and magnetic properties and SAR of the nanoparticles.

show abstract

“…However, compared to perovskite BFO, there has been seldom comprehensive investigation on, especially, the photocatalytic performance of the sillenite Bi 25 FeO 40 . In most of the earlier investigations , on the Bi 25 FeO 40 photocatalyst, the synthesis was conducted at comparatively high reaction temperatures with long time-consuming steps, which resulted in large grain-sized final products. It is to be noted that in a few prior low temperature hydrothermal fabrications, , either the obtained sillenite BFO phases were not scrutinized by Rietveld or relevant analyses or the experiments were performed at a certain temperature with prolonged reaction time (about 20–24 h).…”

Section: Introductionmentioning

confidence: 99%

Simple Low Temperature Technique to Synthesize Sillenite Bismuth Ferrite with Promising Photocatalytic Performance

Sharmin

Basith

2022

ACS Omega

View full text Add to dashboard Cite

Sillenite-type members of the bismuth ferrite family have demonstrated outstanding potential as novel photocatalysts in environmental remediation such as organic pollutant degradation. This investigation has developed a low temperature one-step hydrothermal technique to fabricate sillenite bismuth ferrite Bi 25 FeO 40 (S-BFO) via co-substitution of 10% Gd and 10% Cr in Bi and Fe sites of BiFeO 3 , respectively, by tuning hydrothermal reaction temperatures. Rietveld refined X-ray diffraction patterns of the as-synthesized powder materials revealed the formation of S-BFO at a reaction temperature of 120–160 °C. A further increase in the reaction temperature destroyed the desired sillenite structure. With the increase in the reaction temperature from 120 to 160 °C, the morphology of S-BFO gradually changed from irregular shape to spherical powder nanomaterials. The high-resolution TEM imaging demonstrated the polycrystalline nature of the S-BFO(160) nanopowders synthesized at 160 °C. The as-synthesized samples exhibited considerably high absorbance in the visible region of the solar spectrum, with the lowest band gap of 1.76 eV for the sample S-BFO(160). Interestingly, S-BFO(160) exhibited the highest photocatalytic performance under solar irradiation, toward the degradation of rhodamine B and methylene blue dyes owing to homogeneous phase distribution, regular powder-like morphology, lowest band gap, and quenching of electron–hole pair recombination. The photodegradation of a colorless organic pollutant (ciprofloxacin) was also examined to ensure that the degradation is photocatalytic and not dye-sensitized. In summary, Gd and Cr co-doping have proven to be a compelling energy-saving and low-cost approach for the formulation of sillenite-phase bismuth ferrite with promising photocatalytic activity.

show abstract

Enhanced visible-light responsive photocatalytic activity of Bi25FeO40/Bi2Fe4O9 composites and mechanism investigation

Cited by 40 publications

References 58 publications

Reusable BiFeO₃ Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Reusable BiFeO₃ Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Microstructural, optical, and magnetic properties and specific absorption rate of bismuth ferrite/SiO₂ nanoparticles

Simple Low Temperature Technique to Synthesize Sillenite Bismuth Ferrite with Promising Photocatalytic Performance

Contact Info

Product

Resources

About

Enhanced visible-light responsive photocatalytic activity of Bi25FeO40/Bi2Fe4O9 composites and mechanism investigation

Cited by 40 publications

References 58 publications

Reusable BiFeO3 Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Reusable BiFeO3 Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Microstructural, optical, and magnetic properties and specific absorption rate of bismuth ferrite/SiO2 nanoparticles

Simple Low Temperature Technique to Synthesize Sillenite Bismuth Ferrite with Promising Photocatalytic Performance

Contact Info

Product

Resources

About

Reusable BiFeO₃ Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Reusable BiFeO₃ Nanofiber-Based Membranes for Photo-activated Organic Pollutant Removal with Negligible Colloidal Release

Microstructural, optical, and magnetic properties and specific absorption rate of bismuth ferrite/SiO₂ nanoparticles