Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

Channei, Duangdao; Nakaruk, Auppatham; Khanitchaidecha, Wilawan; Jannoey, Panatda; Phanichphant, Sukon

doi:10.3389/fchem.2018.00415

Cited by 20 publications

(7 citation statements)

References 31 publications

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“…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. As a result, BiVO 4 /rGO composite particles are able to disperse and stabilize on a very high specific surface area of rGO for potential applications in photocatalysis 32,33 .…”

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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101

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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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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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101

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“…1b shows that the as-prepared BiVO 4 exhibited monoclinic phase corresponding to JCPDS No. 14-0688 which showed the highest photocatalytic activity 17 . Similarly, the diffraction peaks of BiVO 4 /SiO 2 coreshell and BiVO 4 /SiO 2 /GO nanocomposite matched well with the monoclinic peaks of pure BiVO 4 and no observation of other impurity peaks, this was due to the much lower content of SiO 2 and GO in composite systems.…”

Section: Resultsmentioning

confidence: 96%

“…Unfortunately, the photocatalytic activity of BiVO 4 is restricted by the weak absorption and the poor migration of charged carriers 15,16 . In order to improve the photocatalytic activity of BiVO 4 , the combination of BiVO 4 with appropriate materials is an effective way to enhance the specific surface area and the crystalline www.nature.com/scientificreports/ structure, leading to the increase of photocatalytic efficiency 17 . Among materials, silicon dioxide (SiO 2 ) is known as an inexpensive material, well biocompatibility, large specific surface area, and easy functionalization; that can form p-n junction with BiVO 4 to enhance the adsorptive ability and the separation of charged carriers 7,[18][19][20] .…”

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confidence: 99%

New insight into the photocatalytic degradation of organic pollutant over BiVO4/SiO2/GO nanocomposite

Trinh

Channei

Nakaruk

et al. 2021

Sci Rep

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The nanocomposite of BiVO4-based material has been synthesized by one-step solvent method. The morphological, physical, chemical properties of the nanocomposite have been investigated. The results revealed that the surface area of BiVO4, BiVO4/SiO2 and BiVO4/SiO2/GO was 11.13, 28.47 and 43.93 m2/g, respectively. The structural test by XRD proved that the nanocomposites were monoclinic phase of bismuth vanadate. Adsorption and photocatalytic degradation were two main mechanisms that strongly related to pollutant removal efficiency (i.e., methylene blue and phenol). The BiVO4/SiO2/GO nanocomposite obtained the greatest MB removal efficiency due to its high adsorption ability from high surface area, whereas the photocatalytic degradation was insignificant mechanism. In contrast, the relatively low adsorption ability of BiVO4/SiO2/GO nanocomposite was observed when the pollutant was phenol due to negative charge and high stability of phenoxide ions, then the photocatalytic degradation became the main mechanism for phenol removal. The phenol removal efficiency reached approximately 70% in 6 h with H2O2 assistance. The combination of SiO2 and GO improved the surface property of BiVO4-based photocatalyst, however the excessive combination ratio generated the excellent adsorbent material rather than the photocatalyst. Hence, the optimal combination ratio is essential to archive the greatest nanocomposite for photocatalytic application.

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“…BiVO4 may exist as three crystalline phases including, scheelite-monoclinic, zircon tetragonal and scheelite tetragonal [10].It is well known that photocatalytic properties always be subject to on its crystal structure [11].The monoclinic structure of BiVO4 shows stronger photocatalytic activity under visible light irradiation for its relatively small bandgap of 2.4 eV compared to other two tetragonal phases of bandgap energy of 2.9 eV [12]. Moreover, pure BiVO4 has some limitations, low absorption rate of incident light, fast recombination of photo generated electrons, non-porous structure and low surface area [13][14].…”

Section: Introductionmentioning

confidence: 99%

Sunlight Driven Activated Carbon Modified BiVO4 Photocatalyst for the Degradation of Rhodamine-B

Prabhavathy¹,

Arivuoli²

2021

JMSSE

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An Efficient photocatalysts for environmental remediation have generated much interest in recent times with a significant emphasis on natural light source. In the present study, activated carbon (AC) incorporated BiVO4 (BV) were synthesized using hydrothermal method and their photocatalytic properties were studied through the photodegradation of Rhodamine B (Rh-B) as a model pollutant under sunlight irradiation. The structural and morphological characteristics of BV and AC-BV nanoparticles have been ascertained, which reveals BV crystallizes in pure monoclinic phase at 120 °C, whereas the modification with AC leads to hexagonal shaped particles. In an effort to develop highly active visible light photocatalysts, small particle size, extended visible absorption in solar spectrum, narrow bandgap and increased surface area were achieved. The inclusion of AC into BV nanoparticles assists the bandgap tuning from 2.4 eV to 1.9 eV which effectively improves the visible light activity of BiVO4. The AC-BV nanoparticles possess mesoporous structure with high surface area of 68.10 m 2 /g which is 9 times greater than that of BV nanoparticles (7.34 m 2 /g). The synthesized AC-BV nanoparticles degrade the pollutant about 98% within 60 minutes whereas BV nanoparticles degrade 47% at same condition. The influence of AC on BV triggers the rate of degradation, due to the narrow bandgap and porosity of the carbon. This study provides a promising photocatalyst to be used for treatment of effluents in large scale.

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Adsorption and Photocatalytic Processes of Mesoporous SiO2-Coated Monoclinic BiVO4

Cited by 20 publications

References 31 publications

Evaluating the photocatalytic efficiency of the BiVO4/rGO photocatalyst

Evaluating the photocatalytic efficiency of the BiVO4/rGO photocatalyst

New insight into the photocatalytic degradation of organic pollutant over BiVO4/SiO2/GO nanocomposite

Sunlight Driven Activated Carbon Modified BiVO4 Photocatalyst for the Degradation of Rhodamine-B

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