Fabrication of BiVO4/BiPO4/GO composite photocatalytic material for the visible light-driven degradation

“…It has been observed that there is an increase in the photocurrent, along with the increase in the applied potential, and Hong et al 59 reported that this behaviour is unique for n-type semiconductors. Increase in the photocurrent increases the charge separation efficiency of the material 64 . In BiVO 4 /TiO 2 nanocomposites (1:2.5 and 1:0.6), a displacement of E fb toward lowest negative values was associated with the high BiVO 4 content and the flat band alignment between BiVO 4 and TiO 2 (E fb can provide information on the band positions of the semiconductor) 65 .…”

Section: Electrochemical Properties Of the Material The Interaction mentioning

confidence: 99%

Electronic and optical competence of TiO2/BiVO4 nanocomposites in the photocatalytic processes

Drisya

Solís-López

Ríos-Ramírez

et al. 2020

Sci Rep

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Nanocomposites with different ratios of titanium dioxide and bismuth vanadate [TiO 2 ]/[BiVO 4 ] give rise to compatible electronic band structure alignment at their interfaces to ensure enhanced photoactivated charge transfer under visible light. The sol-gel method and suitable post-synthesis thermal treatments were used to synthesize different compositions with stabilized anatase phase of tio 2 and monoclinic scheelite polymorph BiVo 4. Structural, electronic and optical characterizations were performed and the results were analysed as a function of the stoichiometry, in which both crystalline structures show a clear junction formation among their characteristic stacking planes. Photocatalytic and (photo) electrochemical responses of the nanocomposites were investigated and tested for the degradation of azo dyes (Acid Blue-113, AB-113) (~ 99%) under visible light radiation. The nanocomposite with a mass ratio of (1:10) shows the highest photocatalytic efficiency compared to the other compositions. HRTEM images showed marked regions in which both crystalline structures form a clear junction and their characteristic planes. However, the increase of BiVO 4 content in the network overcomes the photocatalytic activity due to the decrease in the reduction potential of the photo-generated electrons with high recombination rates. Due to rapid increase in population and the world's rapid industrialization, natural water bodies are being heavily contaminated with industrial wastes 1,2,3. Pollutants present in the industrial effluents are classified as toxins, carcinogens, mutagens, teratogens, and endocrine-disrupting agents 4. Particularly, the presence of dyes in industrial effluents leads to a decreased penetration of sunlight and a reduction of the photosynthetic activities in aquatic ecosystems, as well as an increase in the biochemical oxygen demand 5. The dyes are specified as dispersive dyes (polyester, nylon and acetate) 6 , reactive dyes (Safira dye, HEXL) 7 , sulphur dyes, and vat dyes (viscous) 8. The Azo dyes are colorants that fall under all of the above-mentioned categories. They contain one or more-N=N-groups in their chemical structure, which consists of highly substituted aromatic rings 9. To ensure water purification, several known methods are well-established: desalination, distillation, filtration, flocculation, reverse osmosis, and sedimentation 10,11 , etc. However, the chemical structure of azo dyes leads to recalcitrant characteristics, i.e., they degrade slowly under natural conditions, and they are also resistant to conventional wastewater treatment processes 6. For this reason, Advanced Oxidation Processes (AOPs), have received a widespread attention in recent years, since they are a very convenient water treatment method that eliminates these types of contaminants 5,7. Among AOPs, photocatalysis is considered as a green alternative to attain an efficient purification of polluted water 12,13. Furthermore, the implementation of photoactive nanomaterials in water treatment show outstanding resul...

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“…It should be noted that the existing H 2 O 2 as interfering substrate could have a positive error effected on COD analysis 27 . It is important to be noted that the prove of present hydroxyradical is improtant as presented by several works 2,5,7,12,14,20,23,28 . In addition to the valuation of photocatalytic activity, the active species generated during the MB photocatalytic degradation were investigated by using scavenger as shown in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…In the meantime, physical and chemical processes can generate second byproducts or transfer pollutants into other phases instead of destroying completely pollutants [3][4][5] . Therefore, advanced oxidation processes (AOPs) have been developed as a promising method for removing organic pollutants from aqueous environment, in which photocatalytic process using semiconductor is receiving much attention of researchers due to its advantages including environmental friendliness, no waste byproducts, complete degradation and mild operating conditions 6,7 . As the first photocatalyst discovered, titanium dioxide (TiO 2 ) has been used widely to eliminate pollutants from water sources for many years 8 .…”

mentioning

confidence: 99%

“…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] . In addition, graphene oxide (GO) is known as a 2D carbonaceous material which have large surface area (2630 m 2 /g), high conductivity and excellent mobility of charged carriers [19][20][21][22][23] .…”

mentioning

confidence: 99%

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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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Fabrication of BiVO4/BiPO4/GO composite photocatalytic material for the visible light-driven degradation

Cited by 214 publications

References 42 publications

Hydrothermal synthesis of cotton-based BiVO₄/Ag composite for photocatalytic degradation of C.I. Reactive Black 5

Hydrothermal synthesis of cotton-based BiVO₄/Ag composite for photocatalytic degradation of C.I. Reactive Black 5

Electronic and optical competence of TiO2/BiVO4 nanocomposites in the photocatalytic processes

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

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Fabrication of BiVO4/BiPO4/GO composite photocatalytic material for the visible light-driven degradation

Cited by 214 publications

References 42 publications

Hydrothermal synthesis of cotton-based BiVO4/Ag composite for photocatalytic degradation of C.I. Reactive Black 5

Hydrothermal synthesis of cotton-based BiVO4/Ag composite for photocatalytic degradation of C.I. Reactive Black 5

Electronic and optical competence of TiO2/BiVO4 nanocomposites in the photocatalytic processes

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

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Hydrothermal synthesis of cotton-based BiVO₄/Ag composite for photocatalytic degradation of C.I. Reactive Black 5

Hydrothermal synthesis of cotton-based BiVO₄/Ag composite for photocatalytic degradation of C.I. Reactive Black 5