Construction of CQDs-Bi 20 TiO 32 /PAN electrospun fiber membranes and their photocatalytic activity for isoproturon degradation under visible light

Xie, Ruyi; Zhang, Linping; Liu, Hongchen; Xu, Hong; Zhong, Yi; Sui, Xiaofeng; Mao, Zhiping

doi:10.1016/j.materresbull.2017.05.040

Cited by 27 publications

(19 citation statements)

References 39 publications

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“…In the case of bare BiFeO 3 , the peaks at~440 cm −1 and~560 cm −1 are assigned to the stretching and bending vibrations of Fe-O, which is consistent with the reported result [55]. For the CQDs, the deformation vibration for C-H at~638 cm −1 , the stretching vibration for C-C at~1630 cm −1 , and C-OH stretching at~1120 cm −1 are found [58]. In addition, the characteristic peaks of BiFeO 3 and CQDs are detected in the spectrum of 12C/BFO composite.…”

Section: Characterizationsupporting

confidence: 89%

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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Section: Characterizationsupporting

confidence: 89%

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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“…Additional peaks at 638, 1270, 1467, and 1620 cm −1 are detected for the 10CQDs@Bi 4 Ti 3 O 12 composite. The former two peaks (638 and 1270 cm −1 ) are ascribed to the C–H deformation vibration and the latter two peaks (1467 and 1620 cm −1 ) can be attributed to the C–C stretching vibration [65]. These absorption peaks suggest that CQDs are assembled on the surface of Bi 4 Ti 3 O 12 plates.…”

Section: Resultsmentioning

confidence: 99%

Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance

et al. 2019

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Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4Ti3O12 square plates via a hydrothermal route with the aim of enhancing the photocatalytic performance. XRD (X-ray powder diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance spectroscopy), XPS (X-ray photoelectron spectroscopy), FTIR (Fourier transform infrared spectroscopy), PL (photoluminescence) spectroscopy, EIS (electrochemical impedance spectroscopy) and photocurrent spectroscopy were used to systematically characterize the as-prepared samples. It is demonstrated that the decoration of CQDs on Bi4Ti3O12 plates leads to an increased visible light absorption, slightly increased bandgap, increased photocurrent density, decreased charge-transfer resistance, and decreased PL intensity. Simulated sunlight and visible light were separately used as a light source to evaluate the photocatalytic activity of the samples toward the degradation of RhB in aqueous solution. Under both simulated sunlight and visible light irradiation, CQDs@Bi4Ti3O12 composites with an appropriate amount of CQDs exhibit obviously enhanced photocatalytic performance. However, the decoration of excessive CQDs gives rise to a decrease in the photocatalytic activity. The enhanced photocatalytic activity of CQDs-modified Bi4Ti3O12 can be attributed to the following reasons: (1) The electron transfer between Bi4Ti3O12 and CQDs promotes an efficient separation of photogenerated electron/hole pairs in Bi4Ti3O12; (2) the up-conversion photoluminescence emitted from CQDs could induce the generation of additional electron/hole pairs in Bi4Ti3O12; and (3) the photoexcited electrons in CQDs could participate in the photocatalytic reactions.

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“…Bi 2 WO 6 /BiVO 4 , and Fe 3 O 4 /Bi 2 WO 6 have exactly con rmed that the construction of heterojunctions can improve the photocatalytic performance [22][23][24][25][26].…”

Section: Construction Of Heterojunction Is Compared With Traditional mentioning

confidence: 99%

“…People build different heterojunctions through the load of precious metals (such as silver and silver nanowires, gold, platinum nanoparticles) and other semiconductors. [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Preparation and study of Z-type heterojunction composite photocatalytic material with Ag2MoO4 modified rosette-like Bi2WO6 with Ag-SPR promoting effect

Guo

2021

Preprint

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Here, the novel Ag 2 MoO 4 /Bi 2 WO 6 ( AMO/BWO ) heterojunction composite photocatalysts were synthesized by a two-step method (co-precipitation method + hydrothermal method) and characterized by a variety of characterization techniques including XRD, XPS, SEM, TEM, UV-vis DR spectroscopy, PL spectroscopy and FTIR spectroscopy, as well as EIS analyses, and photocurrent response for confirming the formation of Z-type heterojunctions. The generation and transfer of electron/holes in the AMO/BWO heterojunctions excited by simulated sunlight were analyzed. Under simulated sunlight, the photocatalytic performance of AMO/BWO composites were studied by degradation of organic pollutants. The experimental results show that the 30wt%AMO@BWO is the best photocatalytic composite material among all samples. Due to the prolonging of lifetime of the photoexcited electrons in the CB of AMO and holes in the VB of BWO, these carriers are more effective to participate in photodegradation reactions. An electron/hole transfer mechanism of the Z-scheme heterojunctions is proposed to illustrate the enhanced photodegradation performance of the AMO/BWO composite samples.

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Construction of CQDs-Bi 20 TiO 32 /PAN electrospun fiber membranes and their photocatalytic activity for isoproturon degradation under visible light

Cited by 27 publications

References 39 publications

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

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

Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance

Preparation and study of Z-type heterojunction composite photocatalytic material with Ag2MoO4 modified rosette-like Bi2WO6 with Ag-SPR promoting effect

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Construction of CQDs-Bi 20 TiO 32 /PAN electrospun fiber membranes and their photocatalytic activity for isoproturon degradation under visible light

Cited by 27 publications

References 39 publications

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

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

Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance

Preparation and study of Z-type heterojunction composite photocatalytic material with Ag2MoO4&nbsp;modified rosette-like Bi2WO6 with Ag-SPR promoting effect

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Preparation and study of Z-type heterojunction composite photocatalytic material with Ag2MoO4 modified rosette-like Bi2WO6 with Ag-SPR promoting effect