Study the photocatalytic mechanism of the novel Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst for the simultaneous removal of BPA and chromium(VI)

Zhao, Wei; Zhang, Jin; Zhu, Fuliang; Mu, Feihu; Zhang, Lili; Dai, Benlin; Xu, Jia‐Zhuang; Zhu, Anfeng; Sun, Cheng; Leung, Dennis Y.C.

doi:10.1016/j.cej.2018.12.181

Cited by 111 publications

(28 citation statements)

References 60 publications

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“…The band gap energies (Eg) of CA‐CWO and CA‐CWO calcined at different temperatures were calculated from absorption coefficient data using the Kubelka‐Munk method 46 . As shown in Figure 7, the band gap energies of CA‐CWO, CA‐CWO‐250, CA‐CWO‐450, and CA‐CWO‐700 were found to be 3.86, 2.54, 2.32, and 3.13 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…45 The band gap energies (Eg) of CA-CWO and CA-CWO calcined at different temperatures were calculated from absorption coefficient data using the Kubelka-Munk method. 46 As shown in Figure 7, the band gap energies of CA-CWO, CA-CWO-250, CA-CWO-450, and CA-CWO-700 were found to be 3.86, 2.54, 2.32, and 3.13 eV, respectively. The results indicate that the band gap energy of CA-CWO was decreased with rising of processing temperature except for CA-CWO-700, suggesting the influence of crystallinity and impurity on band gap energy.…”

Section: Optical Properties Of Alginate-based Calcium Tungstate Commentioning

confidence: 90%

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Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Cheng

Zhang

Xue

et al. 2021

J of Applied Polymer Sci

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The alginate-based calcium tungstate composite was fabricated by a facile and eco-friendly one-step crosslinking process combining with the freeze-drying method. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope, X-ray diffraction, thermogravimetric analysis, UV-vis diffuse reflectance spectrum and photoluminescence (PL) were employed to characterize the structures, morphologies, thermal stabilities, and optical properties of the synthesized composite materials. The obtained results demonstrate that the alginate-based calcium tungstate composite presented a special porous network architecture with tetragonal scheelite-type calcium tungstate microspheres attached. A possible synthesis mechanism was proposed based on the experimental data. Moreover, the PL data confirmed the broadband emission of the composite with its maximum at 438 nm that located in the blue emitting region. This study provides the alginate-based calcium tungstate composite with unique morphology and good thermal stability as well as lays a foundation for its application in the field of PL.

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Section: Resultsmentioning

confidence: 99%

Section: Optical Properties Of Alginate-based Calcium Tungstate Commentioning

confidence: 90%

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Cheng

Zhang

Xue

et al. 2021

J of Applied Polymer Sci

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“…First, the BiVO 4 decagonal microplates with {010} and {110} facets were prepared via a modified hydrothermal method. 32,33 Second, the selective photodeposition of Ag nanoparticles (NPs) was carried out using AgNO 3 as the Ag source. 22 Under light irradiation, the photoinduced electrons and holes would selectively migrate to BiVO 4 {010} facets and {110} facets, respectively.…”

Section: Resultsmentioning

confidence: 99%

Facet-Heterojunction-Based Z-Scheme BiVO₄{010} Microplates Decorated with AgBr-Ag Nanoparticles for the Photocatalytic Inactivation of Bacteria and the Decomposition of Organic Contaminants

Bao

Wang

Zhang

et al. 2020

ACS Appl. Nano Mater.

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In the past few years, BiVO4 has received much research attention as one of the most promising photocatalysts to deal with pathogenic bacteria and organic pollutants in wastewater. However, low photocatalytic efficiency is still the main obstacle to its practical applications. Herein, we first fabricated a facet-heterojunction-based Z-scheme photocatalyst AgBr-Ag-BiVO4{010} (BiVO4{010} microplates decorated with AgBr-Ag nanoparticles) to boost the photocatalytic activity of BiVO4 for bacterium inactivation and organic pollution treatment. On account of the directed migration of photogenerated electrons in BiVO4, Ag nanoparticles were selectively produced on the {010} facets of BiVO4 microplates during photoreduction, and the out layer of Ag nanoparticles was subsequently transformed into AgBr via the co-operation of Fe3+ and Br–. The photocatalytic Escherichia coli K-12 inactivation results indicated that AgBr-Ag-BiVO4{010} displays optimal photocatalytic activity for bacterium inactivation among the current BiVO4-based photocatalytic materials, which was ∼4 and 15 times higher than those of Ag-BiVO4{010} and BiVO4, respectively. Scanning electron microscope (SEM) results revealed that the inactivation of E. coli bacteria is due to the breaking of their cell wall and leakage of the cytoplasm. Moreover, AgBr-Ag-BiVO4{010} also shows excellent photocatalytic activity in terms of tetracycline (TC) and Rhodamine B (RhB) degradation compared with BiVO4 and Ag-BiVO4{010}. On the basis of photoluminescence and photoelectrochemical analyses, we can deduce that the extraordinary photocatalytic activity of AgBr-Ag-BiVO4{010} is ascribed to the high separation efficiency of photogenerated charge carriers in the facet-heterojunction-based Z-scheme structure. The free radical trapping and electron paramagnetic resonance (EPR) spin-trap experiments disclosed that the active species in charge of organic degradation are h+, •OH, and •O2 –, while only h+ and •O2 – take part in the inactivation of bacteria. We believe that this study paves a feasible way for constructing cost-efficient facet-heterojunction-based Z-scheme photocatalysts with high efficiency to remediate pathogenic bacteria and organic pollutants in wastewater.

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“…Moreover, the surface of the Ag NPs has inevitably oxidized to Ag 2 O ( E cd = − 4.47 eV, E vd = − 5.98 eV), according to Fig. 1 c. Because the energy of the electrons in the conduction band is insufficient to reduce a proton, Ag 2 O serves as an electrocatalyst for the oxidation reaction of photoelectrical water splitting [ 55 , 56 ]. Eventually, both of the photogenerated electrons and hot electrons are transported through Ti substrate to Pt photocathode to perform the hydrogen evolution reaction, and yet holes are enriched synchronously on Ag 2 O to oxidize water into O 2 .…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

2019

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HIGHLIGHTS• Reduced graphene oxide (rGO) in electrode can weaken the light scattering of plasmonic Ag nanoparticles and promote the hot electrons transfer from Ag nanoparticles to Ti substrate.• A route synergizing rGO with plasmonic Ag on TiO 2 for plasmonic solar water splitting was provided.ABSTRACT Effective utilization of hot electrons generated from the decay of surface plasmon resonance in metal nanoparticles is conductive to improve solar water splitting efficiency. Herein, Ag nanoparticles and reduced graphene oxide (rGO) co-decorated hierarchical TiO 2 nanoring/nanotube arrays (TiO 2 R/T) were facilely fabricated by using two-step electrochemical anodization, electrodeposition, and photoreduction methods. Comparative studies were conducted to elucidate the effects of rGO and Ag on the morphology, photoresponse, charge transfer, and photoelectric properties of TiO 2 . Firstly, scanning electron microscope images confirm that the Ag nanoparticles adhered on TiO 2 R/T and TiO 2 R/T-rGO have similar diameter of 20 nm except for TiO 2 R-rGO/T. Then, the UV-Vis DRS and scatter spectra reveal that the optical property of the Ag-TiO 2 R/T-rGO ternary composite is enhanced, ascribing to the visible light absorption of plasmonic Ag nanoparticles and the weakening effect of rGO on light scattering. Meanwhile, intensity-modulated photocurrent spectroscopy and photoluminescence spectra demonstrate that rGO can promote the hot electrons transfer from Ag nanoparticles to Ti substrate, reducing the photogenerated electronhole recombination. Finally, Ag-TiO 2 R/T-rGO photoanode exhibits high photocurrent density (0.98 mA cm −2 ) and photovoltage (0.90 V), and the stable H 2 evolution rate of 413 μL h −1 cm −2 within 1.5 h under AM 1.5 which exceeds by 1.30 times than that of pristine TiO 2 R/T. In line with the above results, this work provides a reliable route synergizing rGO with plasmonic metal nanoparticles for photocatalysis, in which, rGO presents a broad absorption spectrum and effective photogenerated electrons transfer. TiO 2 nanoring/nanotube arrays rGO flakes Ti substrate e − e − e − h + e − Ag/AgCl electrode Pt electrode H 2 production TiO 2 /Ag/Ag 2 O Electrochemical workstation −7.4 eV −4.2 eV −4.26 eV −4.47 eV −4 −5 −6 −7 −8 −5.98 eV Vacuum E (eV)

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Study the photocatalytic mechanism of the novel Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst for the simultaneous removal of BPA and chromium(VI)

Cited by 111 publications

References 60 publications

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Facet-Heterojunction-Based Z-Scheme BiVO₄{010} Microplates Decorated with AgBr-Ag Nanoparticles for the Photocatalytic Inactivation of Bacteria and the Decomposition of Organic Contaminants

Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

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Study the photocatalytic mechanism of the novel Ag/p-Ag2O/n-BiVO4 plasmonic photocatalyst for the simultaneous removal of BPA and chromium(VI)

Cited by 111 publications

References 60 publications

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Facet-Heterojunction-Based Z-Scheme BiVO4{010} Microplates Decorated with AgBr-Ag Nanoparticles for the Photocatalytic Inactivation of Bacteria and the Decomposition of Organic Contaminants

Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

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Product

Resources

About

Facet-Heterojunction-Based Z-Scheme BiVO₄{010} Microplates Decorated with AgBr-Ag Nanoparticles for the Photocatalytic Inactivation of Bacteria and the Decomposition of Organic Contaminants