Deposition-precipitation preparation of Ag/Ag3PO4/WO3 nanocomposites for efficient Visible-light degradation of rhodamine B under strongly acidic/alkaline conditions

Li, Qingyong; Wang, Fulei; Hua, Yuxiang; Luo, Yuting; Liu, Xiaoheng; Duan, Gengli; Yang, Xin

doi:10.1016/j.jcis.2017.07.018

Cited by 70 publications

(22 citation statements)

References 42 publications

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“…The results are in agreement with the literature. [ 70,80–82 ] The positive slope confirmed the n‐type conductivity of WO 3, and the electron concentrations for the WO 3 :150 °C:10 min and WO 3 :180 °C:10 min films were N D = 1.72 × 10 19 and 1.10 × 10 19 cm −3 , respectively. The values have been estimated from the MS relation, as follows [ 83–86 ]

C_{SC}^{- 2} = 2 / [e ε ε_{0} A^{2} N_{normalD} (E - E_{fb})]

where e is the electron charge, ε the dielectric constant of WO 3 ( ε = 8), [ 87 ] ε 0 the permittivity of vacuum (8.85 × 10 −14 F cm −1 ), A the surface area, and N D the electron density, and 1 kHz was the frequency used for the measurements.…”

Section: Resultsmentioning

confidence: 67%

“…The decrease in PL intensity can be related to the higher quantum efficiency implied in the lower recombination rate of photogenerated electrons, which leads to the better photocatalytic activity under solar radiation. [69,70] The WO 3 films with the highest RhB photodegradation under solar radiation (WO 3 :150 C:10 min and In terms of exposed active facets, the (002), (020), and (200) are reported to have higher reactivity in WO 3 . In fact, the (020) exposed facet is highly active for the orthorhombic WO 3 •0.33H 2 O phase.…”

Section: Optical Characterizationmentioning

confidence: 99%

“…The decrease in PL intensity can be related to the higher quantum efficiency implied in the lower recombination rate of photogenerated electrons, which leads to the better photocatalytic activity under solar radiation. [69,70] The WO 3 films with the highest RhB photodegradation under solar radiation (WO 3 :150 C:10 min and www.advancedsciencenews.com www.pss-rapid.com WO 3 :180 C:10 min) displayed the lowest bandgap values, which is highly desirable for enhanced solar radiation absorption and thus higher photocatalytic efficiency.…”

Section: Optical Characterizationmentioning

confidence: 99%

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Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Nunes

Fragoso

Freire

et al. 2021

Physica Rapid Research Ltrs

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Tungsten oxide (WO3) nanostructured films are synthesized under microwave radiation with synthesis times of 5 and 10 min, at 150 or 180 °C. This ultrafast synthesis route results in uniform and well‐crystallized WO3 nanostructured films fully covering the substrates. A plate‐like hierarchical structure is observed at 150 °C, and closely packed rectangular nanorods are formed at 180 °C. For both temperatures, the nanostructures self‐organize into larger flower‐like structures. The increase of the synthesis time from 5 to 10 min at 180 °C results in thicker films, reaching ≈4 μm. X‐ray diffraction (XRD) and Raman spectroscopy reveal that the films grow with the WO3 orthorhombic crystalline phase (o‐WO3·0.33H2O). Photoluminescence (PL) measurements are performed for all the films, and their optical bandgaps are estimated through diffuse reflectance spectroscopy. The WO3 films have their photocatalytic activity assessed from rhodamine B (RhB) degradation under solar radiation. The Mott–Schottky plots confirm the n‐type character of the films with the flat‐band potentials and electron concentrations being estimated for the best photocatalysts. This study associates the eco‐friendly, fast, and low‐cost aspects of the synthesis route to the production of highly photoactive materials, which can effectively contribute to environmental remediation.

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C_{SC}^{- 2} = 2 / [e ε ε_{0} A^{2} N_{normalD} (E - E_{fb})]

Section: Resultsmentioning

confidence: 67%

Section: Optical Characterizationmentioning

confidence: 99%

“…The decrease in PL intensity can be related to the higher quantum efficiency implied in the lower recombination rate of photogenerated electrons, which leads to the better photocatalytic activity under solar radiation. [69,70] The WO 3 films with the highest RhB photodegradation under solar radiation (WO 3 :150 C:10 min and www.advancedsciencenews.com www.pss-rapid.com WO 3 :180 C:10 min) displayed the lowest bandgap values, which is highly desirable for enhanced solar radiation absorption and thus higher photocatalytic efficiency.…”

Section: Optical Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Nunes

Fragoso

Freire

et al. 2021

Physica Rapid Research Ltrs

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show abstract

“…However, when the solution is more acidic, the catalytic activity will be reduced. Because H + can affect the generation of active substances that play an important role in the photocatalytic process . When the solution is alkaline, TiO 2 composite photocatalyst is negatively charged, which is not conducive to the absorption of PAM in the solution.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of N−TiO₂/C/ATP Composite with Enhanced Visible‐Light Photocatalytic Performance for the Degradation of Polyacrylamide in Wastewater

et al. 2020

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A novel N−TiO2/C/attapulgite (N−TiO2/C/ATP) composite photocatalyst was prepared by sol‐gel method using ATP supported o‐phenanthroline modified TiO2. The as‐prepared samples were characterized by X‐ray diffraction (XRD), fourier transform infrared (FT‐IR), X‐ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), ultraviolet‐visible diffuse reflectance spectroscopy (UV‐vis DRS) and N2 adsorption–desorption measurements. The activity of these photocatalysts was tested by degrading polyacrylamide (PAM) under visible light irradiation while N−TiO2/C/ATP shows significant photocatalytic enhancement compared to pure TiO2. The optimal ratio of N−TiO2/C/ATP photocatalyst is n (TiO2): n (o‐phenanthroline)=20 : 1 and the m (N−TiO2/C): m (ATP)=1 : 1. When the initial concentration of PAM is 300 mg/L and the catalyst dosage is 1.5 g/L, the removal rate of chemical oxygen demand (COD) reaches 86.3 % at pH 2 under 2 h of visible light. The enhanced performance can be attributed to the C element in o‐phenanthroline is modified on the TiO2 surface as a surface sensitizer and the N element may enter anatase TiO2 lattice and replace to form O−Ti−N bond. Meanwhile, some TiO2 particles were permeated into the layer of ATP, which made the composite photocatalyst more stable and the N−TiO2/C/ATP composite exhibits good stability after three times recycling. In addition, the possible photocatalytic mechanism is proposed at the end.

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“…The O 1s peak of Pb 9 (PO 4 ) 6 /Ag 3 PO 4 at 530.95 eV in Fig. C belong to the lattice oxygen atoms O 2− . In Fig.…”

Section: Resultsmentioning

confidence: 89%

Synthesis of Pb₉(PO₄)₆/Ag₃PO₄ Composite Photocatalysts with Enhanced Visible Light Photocatalytic Activity

Guo

Song

Zhang

2018

Photochem & Photobiology

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Pb (PO ) /Ag PO photocatalysts with different amounts of Pb (PO ) were successfully synthesised by the ion exchange method. The catalysts were characterized by X-ray diffractometry (XRD), High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Brunauer- Emmett-Teller (BET), Fourier transform infrared spectrometry (FT-IS), and ultraviolet-visible (UV-vis) spectroscopy. All Pb (PO ) /Ag PO photocatalysts show much higher photocatalytic activities than pure Ag PO under visible light irradiation in the methyl-orange (MO) decomposition. Especially, the 3.0 wt% Pb (PO ) /Ag PO photocatalyst shows the highest photoactivity and also high stability after five cycles. The MO degradation rate during each cycle is almost maintained at 97%. Photo-electrochemical measurement of photocatalysts verified that the enhancing photocatalytic activity was resulted from the electron-hole pair high separation. The photocatalytic activity enhancement of Pb (PO ) /Ag PO is closely related to ·OH, the main active oxygen species.

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Deposition-precipitation preparation of Ag/Ag3PO4/WO3 nanocomposites for efficient Visible-light degradation of rhodamine B under strongly acidic/alkaline conditions

Cited by 70 publications

References 42 publications

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Fabrication and Characterization of N−TiO₂/C/ATP Composite with Enhanced Visible‐Light Photocatalytic Performance for the Degradation of Polyacrylamide in Wastewater

Synthesis of Pb₉(PO₄)₆/Ag₃PO₄ Composite Photocatalysts with Enhanced Visible Light Photocatalytic Activity

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Deposition-precipitation preparation of Ag/Ag3PO4/WO3 nanocomposites for efficient Visible-light degradation of rhodamine B under strongly acidic/alkaline conditions

Cited by 70 publications

References 42 publications

Ultrafast Microwave Synthesis of WO3 Nanostructured Films for Solar Photocatalysis

Ultrafast Microwave Synthesis of WO3 Nanostructured Films for Solar Photocatalysis

Fabrication and Characterization of N−TiO2/C/ATP Composite with Enhanced Visible‐Light Photocatalytic Performance for the Degradation of Polyacrylamide in Wastewater

Synthesis of Pb9(PO4)6/Ag3PO4 Composite Photocatalysts with Enhanced Visible Light Photocatalytic Activity

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Product

Resources

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Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Fabrication and Characterization of N−TiO₂/C/ATP Composite with Enhanced Visible‐Light Photocatalytic Performance for the Degradation of Polyacrylamide in Wastewater

Synthesis of Pb₉(PO₄)₆/Ag₃PO₄ Composite Photocatalysts with Enhanced Visible Light Photocatalytic Activity