Electrical, optical and visible light-photocatalytic properties of monoclinic BiVO4 nanoparticles synthesized hydrothermally at different pH

Karunakaran, C.; Kalaivani, S.; Vinayagamoorthy, P.; Dash, Sasmita

doi:10.1016/j.mssp.2014.01.040

Cited by 35 publications

(13 citation statements)

References 33 publications

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“…The observed NBE emission which is in line with the optical band gap value estimated from Fig. 3(b) (2.2-2.4 eV) and also shows good agreement with previous reports [59,60]. It is reported that the luminescence of BiVO 4 is originate from the recombination of the hole formed in the O 2p band and the electron in the V 3d band [60].…”

Section: Photoluminescencesupporting

confidence: 92%

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

Ravidhas¹,

Josephine²,

Sudhagar

et al. 2015

Materials Science in Semiconductor Processing

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Section: Photoluminescencesupporting

confidence: 92%

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

Ravidhas¹,

Josephine²,

Sudhagar

et al. 2015

Materials Science in Semiconductor Processing

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“…Figure 6c shows the PL emission spectra of pure BiVO 4 and the BiVO 4 -0.057 photocatalysts monitored at an excitation wavelength of 320 nm. The peak at ~535 nm corresponds to the recombination of the hole formed in the O 2p band and the electron in the V 3d band 63 , corresponding to the near band edge emission (NBE) of BiVO 4 64 . A decrease in PL intensity is clearly evident for the BiVO 4 -0.057 due to the effective separation of electron-hole pairs.…”

Section: Resultsmentioning

confidence: 99%

BiVO4-rGO with a novel structure on steel fabric used as high-performance photocatalysts

Fang

Liu

et al. 2017

Sci Rep

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A high-performance and novel photocatalyst of BiVO 4 -reduced Graphene Oxide (BiVO 4 -rGO) nanocomposite was prepared by a facile hydrothermal method. The photocatalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electronic microscopy, UV-Vis diffusion reflectance spectroscopy, photoluminescence spectroscopy and UV-Vis adsorption spectroscopy, respectively. The visible-light photocatalytic activity was evaluated by oxidation of methyl orange (MO) under simulated sunlight irradiation. The results show that the BiVO 4 -rGO nanocomposites exhibit enhanced photocatalytic performance for the degradation of MO with a maximum removal rate of 98.95% under visible light irradiation as compared with pure BiVO 4 (57.55%) due to the increased light absorption intensity and the degradation of electron-hole pair recombination in BiVO 4 with the introduction of the rGO.Due to the rapid urbanization and industrialization, water pollutions has received increased attention, which presents a challenge to environmental governance 1 . Many methods are available for removing organic dyes from wastewater, including physical-2 , biological-3 , electrochemical-4 , and oxidation-technology 5 . Among them, the advanced oxidation technology, especially the photocatalysis method, has become one of the most important techniques for the degradation of organic contaminants in wastewater [6][7][8][9][10][11][12][13] . Monoclinic bismuth vanadate (BiVO 4 ) has been widely used as a photocalalyst dye treatment under visible light irradiation 14 . The advantages of the compound include a narrow band gap for visible light absorption, abundant availability, low cost and good stability 15 . It is known that the photocatalytic properties of the material greatly depend on its the structure and morphology [16][17][18] . There are three main crystal structures for BiVO 4 : monoclinic scheelite, tetragonal zircon, and tetragonal scheelite 19 . Among them, the monoclinic BiVO 4 is an n-type semiconductor with a narrow band gap of about 2.4 eV and it has an excellent photocatalytic activity in the visible range for the degradation of organic pollutants because of its appropriate band gap for solar energy conversion 20 . However, the low photocatalytic activity of pure BiVO 4 has limited its further use in practical applications due to its poor adsorptive performance and migration difficulty of photo-generated electron-hole pairs 21,22 . To overcome this problem, many efforts have been made to enhance the activity of BiVO 4 -based photocatalysts. Element dopants added to BiVO 4 to increase the donor density and carrier mobility 23 and BiVO 4 -based composites including homo/hetero-junction construction and co-catalyst loading metal oxide compounds have been investigated [24][25][26][27] . These results have shown that the BiVO 4 -based composites favor the separation of photo-induced electron-hole pairs and result in enhanced photocatalytic activity in the visible range 28 . Recently, t...

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“…The BiVO 4 crystals were prepared according to the literature [29]. In a typical manner, two solutions named A and B were prepared as follows.…”

Section: Preparation Of Bivo 4 Crystalsmentioning

confidence: 99%

BiVO₄/Mn₃O₄ a novel p–n heterojunction photocatalyst functionalized with metalloporphyrins: Synthesis, charge transfer mechanism, and enhanced visible‐light photocatalysis for degradation of dye pollutant

Rahimi

Mehrehjedy

Zargari

2017

Env Prog and Sustain Energy

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A simple one-pot hydrothermal method was successfully used to synthesize p-n heterojunction Mn 3 O 4 /BiVO 4 composites with different contents of BiVO 4 . The experimental results show that the as-prepared p-n heterojunction Mn 3 O 4 / BiVO 4 composite exhibited higher visible light photocatalytic activity for the degradation of model dye methylene blue than the pure BiVO 4 and Mn 3 O 4 crystal under irradiation of 5 W white LED lamp. The enhanced photocatalytic efficiency is due to a large number of p-n heterojunctions in Mn 3 O 4 / BiVO 4 composites, which effectively reduces the recombination of the electrons and holes by charge transfer from n-type BiVO 4 to p-type Mn 3 O 4 crystals. The prepared p-n heterojunction Mn 3 O 4 /BiVO 4 composite was functionalized with cobalt, zinc, copper, and tin complexes of porphyrin. The energy diagrams of these prepared compounds were calculated via the electrochemical investigations and the electron transfer mechanism was discussed in details. The photocatalytic efficiency of the functionalized nanocomposites enhances significantly compared to the p-n heterojunction Mn 3 O 4 / BiVO 4 under visible light irradiation. Between the prepared compounds, BiVO 4 /Mn 3 O 4 -CoTCPP shows higher photocatalytic activity. This compound can destruct 98% of dye pollutant in 180 min under irradiation of 5 W white LED lamp. Furthermore, this photocatalyst shows proper stability after four cycle degradation test.

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Electrical, optical and visible light-photocatalytic properties of monoclinic BiVO4 nanoparticles synthesized hydrothermally at different pH

Cited by 35 publications

References 33 publications

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

BiVO4-rGO with a novel structure on steel fabric used as high-performance photocatalysts

BiVO₄/Mn₃O₄ a novel p–n heterojunction photocatalyst functionalized with metalloporphyrins: Synthesis, charge transfer mechanism, and enhanced visible‐light photocatalysis for degradation of dye pollutant

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Electrical, optical and visible light-photocatalytic properties of monoclinic BiVO4 nanoparticles synthesized hydrothermally at different pH

Cited by 35 publications

References 33 publications

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

Facile synthesis of nanostructured monoclinic bismuth vanadate by a co-precipitation method: Structural, optical and photocatalytic properties

BiVO4-rGO with a novel structure on steel fabric used as high-performance photocatalysts

BiVO4/Mn3O4 a novel p–n heterojunction photocatalyst functionalized with metalloporphyrins: Synthesis, charge transfer mechanism, and enhanced visible‐light photocatalysis for degradation of dye pollutant

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BiVO₄/Mn₃O₄ a novel p–n heterojunction photocatalyst functionalized with metalloporphyrins: Synthesis, charge transfer mechanism, and enhanced visible‐light photocatalysis for degradation of dye pollutant