Synthesis and characterization of a novel BiVO4/SiO2 nanocomposites

Liu, Baojiang; Wang, Zhenhua; Zhou, Shanquan; He, Jinxin

doi:10.1016/j.matlet.2015.07.104

Cited by 22 publications

(5 citation statements)

References 12 publications

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“…The estimated band gap values in this study was similar to those of BiVO 4 reported by Jiang et al ( 2012 ), who prepared the BiVO 4 photocatalysts with different morphologies using the hydrothermal method. Liu et al ( 2015 ) observed that the band gap energy of BiVO 4 /SiO 2 catalyst estimated to be 2.32 eV, which was almost the same as that of calculate by this study.…”

Section: Resultssupporting

confidence: 86%

Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

et al. 2018

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The silicon dioxide (SiO2)–coated bismuth vanadate (BiVO4) composites as visible–driven–photocatalysts were successfully synthesized by the co–precipitation method. The effects of SiO2 coating on the structure, optical property, morphology and surface properties of the composites were investigated by X–ray diffraction (XRD), UV–visible diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM) and Brunauer–Emmette–Teller (BET) measurements. The photocatalytic activity of monoclinic BiVO4 and BiVO4/SiO2 composites were evaluated according to the degradation of methylene blue (MB) dye aqueous solution under visible light irradiation. The SiO2−coated BiVO4 composites showed the enhancing photocatalytic activity approximately threefold in comparison with the single phase BiVO4.

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Section: Resultssupporting

confidence: 86%

Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

et al. 2018

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“…Some research works have been found to combine photocatalyst with reduced graphene oxide (rGO) for the photocatalytic degradation of organic dyes 20–29 . Since the rGO has shown high performance in many applications due to its excellent charge separation ability between the intrinsic delocalized π–π electron, the rGO could promote electron transport between the composite BiVO/rGO photocatalyst and the organic pollutant molecules 30,31 . Because of its high surface area, rGO can be applied as a supporting material, not only to significantly increase the surface area of the system, but also to increase the number of surface active sites.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the photocatalytic efficiency of the BiVO4/rGO photocatalyst

Phanichphant

Nakaruk

Chansaenpak

et al. 2019

Sci Rep

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The present study reported the preparation of BiVO4 by co-precipitation method. The as-prepared BiVO4 photocatalyst were deposited on rGO sheets to form BiVO4/rGO via the hydrothermal method. The crystalline structure, morphological, optical properties, and surface properties of the synthesized pure BiVO4 compared to BiVO4/rGO composite were studied using X-ray diffraction (XRD), scanning electronmicroscopy (SEM), photoluminescence (PL) spectrophotoscopy, UV–vis spectrophotometer with an integrating sphere, and N2 adsorption-desorption isotherm based on BET theory. The photocatalytic activity of the prepared samples were evaluated by the degradation of MB dye in aqueous medium under visible light irradiation. The result showed that the BiVO4/rGO composite exhibited greater photocatalytic efficiency compared to pure BiVO4 with the photocatalytic degradation efficiency remains stable up to fifth cycle. The improved activity of the BiVO4/rGO composite might be attributed to the high surface area available to adsorb more MB molecules, and efficient charge separation of BiVO4 through π electron on the rGO structure. According to experimental results, the possible photocatalytic mechanism of the BiVO4/rGO composite were determined and the active species hydroxyl radical were reported. Based on photocatalytic activity inhibition in the presence of both h+ (VB) and O2•− (CB) scavengers over the BiVO4 photocatalyst, it can be proposed that the hydroxyl radical generated during the photocatalytic degradation mechanism is mainly responsible by the main active species of h+ and O2•− at VB and CB positions, respectively.

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“…The O 1s spectra were fitted by three bands located at 528.6 eV, 529.85 eV and 532.67 eV, as shown in figure 5(d). The peak at 528.6 eV was attributed to chemically absorbed oxygen on the surface of the hybrid pigments, while the peaks at 529.85 eV and 532.67 eV were assigned to the lattice oxygen in crystalline BiVO 4 and SiO 2 [30,31], respectively. Because the SiO 2 was encapsulated by BiVO 4 nanoparticles, the peak at 532.67 eV (SiO 2 ) was less intense than that at 529.86 eV (BiVO 4 ).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and coloration of highly dispersive SiO₂/BiVO₄ hybrid pigments with low cost and high NIR reflectance

Wang

Liu

et al. 2019

Nanotechnology

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Highly dispersed SiO2/BiVO4 hybrid pigments with a spherical structure and high near-infrared (NIR) reflectance have been successfully fabricated by a facile sol–gel method followed by calcination. The dispersed and uniformly spherical particles of the hybrid pigments were caused by the support provided by SiO2 microspheres, and their color was adjusted via the band-gap energy, which was changed with the incorporation of SiO2 microspheres. The SiO2/BiVO4-3 hybrid pigment presented higher yellow hues (b* = 91.42) and more dispersed spherical particles than other as-prepared hybrid pigments and commercially available BiVO4-based yellow pigment. This strategy could save 72 wt% resource of BiVO4 while yielding the same amount of yellow pigment with high color performance. Therefore, the prepared hybrid pigments not only dramatically decreased the cost of expensive pigments, but also saved scarce resources and reduced environmental pollution. In addition, the SiO2/BiVO4-3 hybrid pigment also presented high NIR reflective performance, which demonstrated that it would be a favorable candidate for colorful NIR reflective pigments with wide applications in heat insulation.

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Synthesis and characterization of a novel BiVO4/SiO2 nanocomposites

Cited by 22 publications

References 12 publications

Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

Evaluating the photocatalytic efficiency of the BiVO4/rGO photocatalyst

Synthesis and coloration of highly dispersive SiO₂/BiVO₄ hybrid pigments with low cost and high NIR reflectance

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Synthesis and characterization of a novel BiVO4/SiO2 nanocomposites

Cited by 22 publications

References 12 publications

Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

Evaluating the photocatalytic efficiency of the BiVO4/rGO photocatalyst

Synthesis and coloration of highly dispersive SiO2/BiVO4 hybrid pigments with low cost and high NIR reflectance

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Synthesis and coloration of highly dispersive SiO₂/BiVO₄ hybrid pigments with low cost and high NIR reflectance