BiVO&lt;sub&gt;4&lt;/sub&gt;-TiO&lt;sub&gt;2&lt;/sub&gt; Nanocomposite: Synthesis and Photocatalytic Investigation

Rahimi, Rahmatollah; Zargari, Solmaz; Moghaddas, Masoumeh Mahjoub

doi:10.4028/www.scientific.net/amr.702.172

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…This behaviour was attributed to the low activity of BiVO 4 derived from its small specific surface area, 52, 56 and 44 m 2 /g for nanocomposites ratios 1:10, 1:2.5 and 1:0.6 respectively. This morphology influences the density of photogenerated charge carriers 46 due to the recombination process. The ratio 1:10 was selected to conduct the dye removal by photocatalytic reactions since this compound showed the best results with the lowest concentration of the nanocomposite material.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…The combination of BiVO 4 and TiO 2 has attracted much attention recently in photocatalysis. 20,[24][25][26][27][28][29][30][31] However, the photocatalysis promoting mechanism remains unclear and diverging. Hu et al 26 proposed a band conguration where the CB and VB of BiVO 4 were positioned at locations higher than the CB and VB of pure TiO 2 , respectively.…”

Section: Photocatalysis Mechanismmentioning

confidence: 99%

“…22,23 The combination of a narrow bandgap semiconductor material such as BiVO 4 with TiO 2 to produce a BiVO 4 /TiO 2 nanocomposite with an intimate heterojunction could be an efficient way to offer a visible light photocatalyst with high photocatalytic activity and attracts increasing attention. 20,[24][25][26][27][28][29][30] Cao et al 24 synthesized the porous peanut-like BiVO 4 /TiO 2 composite nanostructures by a hydrothermal process and the photocatalytic activity of these BiVO 4 / TiO 2 nanostructures was largely enhanced. Zhang et al 25 reported the synthesis of BiVO 4 /TiO 2 by a one-step microwave hydrothermal method and found that the 20 wt% TiO 2 /BiVO 4 nanocomposite exhibited better photocatalytic activity than pure monoclinic BiVO 4 and other percentages of TiO 2 in BiVO 4 because of its high crystallinity, narrow bandgap, and most importantly, the hierarchical heterostructure which can effectively separate photoinduced electron-hole pairs on the surface of BiVO 4 /TiO 2 photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Novel 3DOM BiVO₄/TiO₂ nanocomposites for highly enhanced photocatalytic activity

et al. 2015

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“…The well-matched energy band alignement is a key factor for the achievement of efficient heterojunctions [24,25]. Recently the BiVO 4 /TiO 2 heterojunction has been attracted considerable attention as a promising photocatalyst under visible light irradiation and has shown a significant suppression of the photogenerated electron-hole recombination [26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

BiVO4/3DOM TiO2 nanocomposites: Effect of BiVO4 as highly efficient visible light sensitizer for highly improved visible light photocatalytic activity in the degradation of dye pollutants

Zalfani

et al. 2017

Applied Catalysis B: Environmental

105

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The effect of the amount of BiVO 4 as visible light sensitizer on the photocatalytic activity of BiVO 4 /3DOM TiO 2 nanocomposites was highlighted. The low amount of BiVO 4 nanoparticles favors the transfer of photogenerated electrons to 3DOM TiO 2 while photogenerated electrons will remain at the surface of BiVO 4 at high amount of BiVO 4 , leading to the recombination of electrons-holes and reduced photocatalytic activity. 1 0 0.6 0.4 0.2 0.08 0.04 0.0209 0.0381 0.0256 0.0152 0.110 0.0078 0.0062 100 75 50 25 10 5 0 0.040 0.035 0.030 0.025 0.020 0.015 0.010 0.005 0.000 Rate Constant (min -1 ) mol % BiVO 4 -1 0 1 2 3 E (NHE) CB VB O 2 /O 2 .-OH . /H 2 O Oxidation Highlights -BiVO 4 @3DOM TiO 2 exhibit highly enhanced visible light photocatalytic activity -The effect of the amount of BiVO 4 as visible light sensitizer is highlighted -The electronic interactions BiVO 4 /TiO 2 lead to an improved charge separation -High BiVO 4 content leads to the accumulation of the electron/hole pairs at the surface of the BiVO 4 4 Abstract A series of BiVO 4 /3DOM TiO 2 nanocomposites have been synthesized and their photocatalytic activity was investigated under visible light irradiation using the RhB dye as model pollutant molecule in an aqueous solution. The effect of the amount of BiVO 4 as visible light sensitizer on the photocatalytic activity of BiVO 4 /3DOM TiO 2 nanocomposites was highlighted. The heterostructured composite system leads to much higher photocatalytic efficiencies than bare 3DOM TiO 2 and BiVO 4 nanoparticles. As the proportion of BiVO 4 in BiVO 4 /3DOM TiO 2 nanocomposites increases from 0.04 to 0.6, the photocatalytic performance of the BiVO 4 /3DOM TiO 2 nanocomposites increases and then decreases after reaching a maximum at 0.2. This improvement in photocatalytic perfomance is related to 1) the interfacial electron transfer efficiency between the coupled materials, 2) the 3DOM TiO 2 inverse opal structure with interconnected pores providing an easy mass transfer of the reactant molecules and high accessibility to the active sites and large surface area and 3) the effect of light sensitizer of BiVO 4 . Intensive studies on structural, textural, optical and surface properties reveal that the electronic interactions between BiVO 4 and TiO 2 lead to an improved charge separation of the coupled BiVO 4 /TiO 2 system. The photogenerated charge carrier densities increase with increasing the BiVO 4 content, which acts as visible light sensitizer to the TiO 2 and is responsible for the enhancement in the rate of photocatalytic degradation. However, the photocatalytic activity is reduced when the BiVO 4 amount is much higher than that of 3DOM TiO 2 . Two reasons could account for this behavior. First, with increasing BiVO 4 content, the photogenerated electron/hole pairs are accumulated at the surface of the BiVO 4 nanoparticles and the recombination rate increases as shown by the PL results. Second, decreasing the amount of 3DOM TiO 2 in the nanocomposite decreases the surface area as shown by the BET results. Mo...

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BiVO<sub>4</sub>-TiO<sub>2</sub> Nanocomposite: Synthesis and Photocatalytic Investigation

Cited by 4 publications

References 10 publications

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

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

Novel 3DOM BiVO₄/TiO₂ nanocomposites for highly enhanced photocatalytic activity

BiVO4/3DOM TiO2 nanocomposites: Effect of BiVO4 as highly efficient visible light sensitizer for highly improved visible light photocatalytic activity in the degradation of dye pollutants

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BiVO<sub>4</sub>-TiO<sub>2</sub> Nanocomposite: Synthesis and Photocatalytic Investigation

Cited by 4 publications

References 10 publications

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

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

Novel 3DOM BiVO4/TiO2 nanocomposites for highly enhanced photocatalytic activity

BiVO4/3DOM TiO2 nanocomposites: Effect of BiVO4 as highly efficient visible light sensitizer for highly improved visible light photocatalytic activity in the degradation of dye pollutants

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Novel 3DOM BiVO₄/TiO₂ nanocomposites for highly enhanced photocatalytic activity