Bismuth Vanadate Nanoparticles Research Articles

Multifunctional applications of bismuth vanadate nanoparticles: enhanced photocatalytic, good sensor and supercapacitor property

Multifunctional applications of bismuth vanadate nanoparticles: enhanced photocatalytic, good sensor and supercapacitor property

Green synthesis of bismuth vanadate nanostructures for efficient photocatalytic and biological studies

In the current investigation, BiVO4 nanoparticles were prepared via a simple combustion approach followed by annealing at 400°C using rain tree pod extract. The physicochemical and morphological features were examined through spectroscopic techniques. Optical studies were carried out using a UV–visible spectrophotometer, revealing a bandgap of 2.4 eV. Photocatalytic efficiency was assessed through degradation studies using methylene blue (MB) dye under visible photon irradiation, demonstrating an impressive 94 % degradation rate. Consequently, this synthesized bismuth vanadate serves as an outstanding photocatalyst under visible irradiation. Furthermore, these nanoparticles exhibited favorable responses in antifungal, antibacterial, and molecular docking studies. Bismuth vanadate nanoparticles had substantial antifungal efficacy, with the Bi2 version successfully suppressing Aspergillus Niger at a 50 % concentration. At 100 mg/ml, Bi2 showed a 6 mm zone of inhibition against Gram-positive Staphylococcus aureus and a 5 mm zone against Gram-negative Escherichia coli for antibacterial evaluation. The protein 7BLY and Bismuth vanadate had four hydrogen bond interactions and a strong binding affinity, as shown by molecular docking, of −5.0 Kcal/mol. Therefore, bismuth vanadate nanoparticles synthesized through green methods show promise in combating fungal and bacterial infections, as well as potential applications in various fields.

Enhanced electrophoretic deposition of hydrophobic BiVO4 photocatalytic coatings using Cu2+ ions as stabilizing agent

In this work, we report the preparation of monoclinic bismuth vanadate (BiVO4) coatings through an electrophoretic deposition process (EPD) using Cu2+ ions as a charge-stabilizing agent. BiVO4 was prepared through a rapid coprecipitation route, yielding rounded nanoparticles with sizes smaller than 100 nm. The bismuth vanadate nanoparticles were dispersed in isopropyl alcohol for electrophoretic deposition onto aluminum plates using a constant applied voltage of 12 V for 30 min. The results have shown that the deposited amount of BiVO4 nanoparticles increases with the initial concentration of the Cu(NO3)2⋅5H2O additive. According to XPS analysis, EPD coatings exhibit the presence of metallic copper due to the reduction of Cu2+ ions on the BiVO4 during the electrophoretic deposition process. The photocatalytic properties of BiVO4 coatings were assessed in the degradation of the antibiotic tetracycline under simulated solar irradiation. The BiVO4 coating prepared with an initial concentration of 0.5 mM of Cu(NO3)2⋅5H2O exhibited the highest photocatalytic performance, achieving a degradation efficiency of approximately 92 % after 240 min of irradiation. Furthermore, the BiVO4 coatings displayed superhydrophobic properties, as determined by measuring static water contact angles.

Avocado seed biomass-assisted synthesis of heterostructure bismuth vanadate nanomaterial by combustion method for the application of electrochemical lithium battery storage and supercapacitor

With the global demand for lithium-ion batteries (LIBs), research is focused on developing advanced energy storage materials with high energy and power densities. Hetero-structured nanomaterials have garnered significant interest in energy storage applications based on their unique architecture providing sites for improved electrochemical activity. This work reports a facile single-step combustion synthesis of bismuth vanadate nanoparticles (BVNPs) using avocado seed powder, an economical and eco-friendly fuel source. By optimizing the precursor-to-fuel ratio to 1:1, highly pure phase BVNPs were obtained as characterized via XRD, FT-IR, SEM-EDAX, TEM, UV-DRS, PL, BET, and DLS analyses. When assessed as an electrode material for LIBs, the BVNP1:1 delivered an exceptional initial discharge capacity of 2166 mAhg−1 and a retention of ∼53 mAhg−1 over 90 cycles with 99% Coulombic efficiency. The BVNP1:1 electrode exhibited a maximum specific capacitance of 545.65 mF/cm2 at 2 mA/cm2 current density as a supercapacitor. The combination of scalable green synthesis, excellent phase purity, and superior electrochemical performance makes these BVNPs a promising and sustainable electrode material for forthcoming energy storage technologies to meet the surging energy needs.

Reduced graphene oxide supported monoclinic bismuth vanadate nanoparticles as an electrocatalyst for selective determination of dopamine in human urine samples

WHO report says that 6.8 million people succumb to neurological disorders every year. For early detection of disease and disease diagnostic purposes, dopamine detection in bio fluid is inevitable in the medical field. In this work, BiVO4 and different amounts of rGO-loaded BiVO4 were synthesized by hydrothermal technique followed by reflux method. The different analysis confirms the formation of BiVO4 and rGO/BiVO4 nanocomposite. The electrochemical active surface area of glassy carbon electrode (GCE), BiVO4/GCE, 5rGO/BiVO4/GCE, 15rGO/BiVO4/GCE and 30rGO/BiVO4/GCE nanocomposite are 0.0747, 0.0585, 0.06696, 0.0714, and 0.0774 cm2 respectively. The 30rGO/BiVO4 nanocomposite showed a high electrocatalytic current towards the oxidation of dopamine. In pH 3 phosphate buffer solution (PBS), 30rGO/BiVO4 nanocomposite exhibited a higher catalytic current than pH (4–7) and pH 3 choose as an optimal pH for whole dopamine sensing. The oxidation of dopamine on the surface of 30rGO/BiVO4 is a diffusion-controlled process. The Rct value of 30rGO/BiVO4/GCE is low compared to other samples which enhances the electron transfer between the analyte and modified electrode. The 30rGO/BiVO4/GCE electrode exhibited, two dynamic linear ranges is 0.25–5 μM and 10–100 μM with a limit of detection of 0.098 μM and 0.713 μM. From the practical application point of view, the main co-existing interference signal is from ascorbic acid and uric acid. The 30rGO/BiVO4 showed a distinctive SWV peak for ascorbic acid and uric acid. In the urine samples, 30rGO/BiVO4/GCE nanocomposite showed more than 89% recovery for spiked dopamine.

Monoclinic bismuth vanadate nanoparticles as saturable absorber for Q-switching operations at 1.3 and 2 μm

We synthesized monoclinic bismuth vanadate (m-BiVO4) nanoparticles via the sol-gel method. The modulation depths were 20.1% and 8.8% at 1.34 and 2 μm, respectively. Passively Q-switched bulk lasers with m-BiVO4 saturable absorber were demonstrated operating at 1.34 and 2 μm. At 1.34 μm, the shortest pulse duration was 355 ns with a pulse repetition frequency of 242.6 kHz, while in a Tm-doped bulk laser at ∼2 μm, the minimum pulse width was 540 ns with a pulse repetition rate of 53.7 kHz. Results showed that m-BiVO4 possessed good broadband optical nonlinearities and can be applied for the optical pulse generation.

Investigation of structural, magnetic, optical and photocatalytic properties of zinc ferrite nanowires/bismuth vanadate composite

In this paper, zinc ferrite nanowires with an average length of 6.3 µm and an average diameter of 38 nm, bismuth vanadate nanoparticles, and zinc ferrite nanowires/bismuth vanadate composites were fabricated by AC pulse electrodepositing, co-precipitation, and hydrothermal methods, respectively. In order to study the samples, XRD analysis, FESEM, FTIR spectroscopy, EDS spectroscopy, UV-Vis spectroscopy, PL spectroscopy, and VSM were used. XRD patterns of the samples revealed that they did not contain any impurities and that zinc ferrite nanowires and bismuth vanadate nanoparticles had cubic spinel and monoclinic structures, respectively. The optical gap energy of all the samples was in the range of visible light. According to the magnetic hysteresis loops, the composites exhibited paramagnetic behavior. The intensity of the photoluminescence spectrum of the composites (especially those containing 20 wt% of zinc ferrite) was less than the intensity of the photoluminescence spectrum of bismuth vanadate and zinc ferrite. The weaker the intensity of the photoluminescence spectrum, the longer the separation of electron-hole pairs and this leads to an increase of photocatalytic activity. The photocatalytic activity of the composites for decomposing Congo red under visible light was improved as compared to zinc ferrite and bismuth vanadate and the highest degradation rate was related to nanocomposite containing 20 wt% zinc ferrite. These results were obtained because the probability of recombining photogenerated electrons and holes was reduced and there were nanowires in the composite samples, leading to an increase of the contact surface. According to the results of this study, zinc ferrite nanowires/bismuth vanadate nanocomposite with 20 wt% of zinc ferrite is a good choice for the degradation of organic matter under sunlight.

Light-switching chemistry for photocatalytic methane oxidation over quantum dots

Selective photocatalytic oxidation of methane to oxygenates under ambient temperature at high productivities is a challenging problem in modern chemistry. In a recent issue of <i>Nature Sustainability</i>, Tang and co-workers reported selective oxidation of methane to methanol and formaldehyde under visible and UV light, respectively, by using quantum-sized bismuth vanadate nanoparticles.

Selective photocatalytic oxidation of methane by quantum-sized bismuth vanadate

The direct oxidation of methane to more desirable, one-carbon oxygenated molecules such as methanol and formaldehyde offers a pathway towards a more sustainable chemical industry as the current commercial reforming process involving two steps features a high carbon footprint and energy consumption. Here, we report the selective photocatalytic oxidation of methane at room temperature using quantum-sized bismuth vanadate nanoparticles as the catalyst and oxygen as a mild oxidant. The reaction offers a high selectivity, of 96.6% for methanol or 86.7% for formaldehyde, under optimum wavelength and intensity of light, reaction time and amount of water solvent. Comprehensive characterizations disclose a multistep reaction mechanism in which the activation of methane by the hydroxyl radical determines the reaction rate. This work broadens the avenue towards the selective conversion of the greenhouse gas methane into desirable chemical products in a sustainable way.

Highly efficient photocatalytic hyperbranched polyethyleneimine/bismuth vanadate membranes for the degradation of triclosan

Worldwide, pharmaceutical and personal care products are increasingly being used and produced and their presence in various water bodies has attracted significant attention amongst the public and scientists. Classified as emerging pollutants, these pharmaceutical and personal care products ultimately accumulate in and contaminate natural water bodies through several pathways. In this study, a photocatalytic membrane consisting of bismuth vanadate nanoparticles and hyperbranched polyethyleneimine, blended in polyethersulphone, was used in the degradation of triclosan. Bismuth vanadate was characterised using X-ray diffraction and Raman spectroscopy. These analyses revealed that there was successful synthesis of the monoclinic phase of bismuth vanadate, as well as a monoclinic-to-tetragonal (M → T) phase transformation upon the addition of hyperbranched polyethyleneimine to the nanoparticles. The modified membranes showed improved water flux and hydrophilicity (contact angles of between 71° and 56°) as compared to that of the bare polyethersulphone (75°) upon the addition of hyperbranched polyethylene amine and bismuth vanadate. The modified membranes were effective in the photodegradation of triclosan (up to 86%), and the generation of chloride ions was observed.

Effect of pH on visible-light-driven photocatalytic degradation of facile synthesized bismuth vanadate nanoparticles

Bismuth vanadate (BiVO4) nanoparticles were synthesized by a simple co-precipitation method for different pH conditions (9, 10 and 11). The XRD patterns revealed that the synthesized nanoparticles belong to monoclinic single-phase BiVO4 which was again confirmed from Raman studies. The chemical state of the elements in BiVO4 and surface morphology were investigated using XPS and SEM analysis respectively. The optical absorption and PL studies revealed wide absorption in the visible region with strong emission at 520 nm. The efficiency of the samples was examined from the photocatalytic degradation of Rhodamine B dye.

Synthesis and characterization of BiVO4 nanoparticles for environmental applications.

In the present study, a chemical precipitation method is adopted to synthesize bismuth vanadate nanoparticles. The calcination temperature dependent photocatalytic and antibacterial activities of BiVO4 nanoparticles are examined. The structural analysis evidences the monoclinic phase of BiVO4 nanoparticles, where the grain size increases with calcination temperature. Interestingly, BiVO4 nanoparticles calcined at 400 °C exhibit superior photocatalytic behaviour against methylene blue dye (K = 0.02169 min−1) under natural solar irradiation, which exhibits good stability for up to three cycles. The evolution of antibacterial activity studies using a well diffusion assay suggest that the BiVO4 nanoparticles calcined at 400 °C can act as an effective growth inhibitor of pathogenic Gram-negative (P. aeruginosa & A. baumannii) and Gram-positive bacteria (S. aureus).

Aerobic oxidation of benzyl alcohols to benzaldehydes using monoclinic bismuth vanadate nanoparticles under visible light irradiation: Photocatalysis selectivity and inhibition

Monoclinic bismuth vanadate nanoparticles (nan-BiVO4) have been used for the selective photo-oxidation of benzyl alcohols (13 examples) to benzaldehydes under visible light irradiation using dioxygen as oxidant. Illumination with a blue LED (λmax=470nm) gave yields more than 30 times greater than bulk BiVO4 with >99% selectivity for several cases. Photo-oxidation of PhCH2OH/PhCD2OH isotopomers gave a kinetic isotope effect of 1.3 indicating that CH bond activation is not the rate determining step in contrast to other reported photocatalysts including TiO2 and carbon nitride. Collectively, structural characterisation, spectroscopic, and reactivity data are correlated with the greater surface area of nan-BiVO4 compared to bulk BiVO4. Furthermore, conversion is shown to be limited as reaction progresses. Control experiments indicate that photo-oxidation is retarded by product aldehyde and that trace amounts (<1%) of the corresponding benzoic acid, from over-oxidation, result in significant reduction in conversion.

BiVO4 nanoparticles: Preparation, characterization and photocatalytic activity

AbstractBismuth vanadate (BiVO4) nanoparticles were synthesized by a simple thermal decomposition method. The synthesized bismuth vanadate nanoparticles were characterized by X-ray diffraction analysis, it is found that the synthesized sample belongs to monoclinic BiVO4. Fourier transform infrared spectroscopy confirms the formation of Bi-O bond in the sample. Ultraviolet–Visible (DRS-UV–Visible) spectroscopy and photoluminescence spectroscopy reveal the optical property of the BiVO4 nanoparticles. The morphology was identified by both scanning electron microscopy and high-resolution transmission electron microscopy. Further, the photocatalytic activity of BiVO4 nanoparticles was investigated by photodegradation of methylene blue as a model organic pollutant.

Enhanced visible light-photocatalysis by hydrothermally synthesized thallium-doped bismuth vanadate nanoparticles

Thallium-doped (1.5, 2.3 and 19.3at%) bismuth vanadate (BiVO4) and pristine BiVO4 nanoparticles were hydrothermally synthesized. They were characterized by powder X-ray and selected area electron diffractometries, high resolution scanning electron and transmission electron microscopies, and energy dispersive X-ray, Raman, UV–visible diffuse reflectance and photoluminescence spectroscopies. Tl-doping reduces the band gap energy and recombination of charge carriers. The visible light photocatalytic activity of 19.3% Tl-doped BiVO4 nanoparticles is larger than those of the other Tl-doped BiVO4 and pristine BiVO4 nanoparticles. The synthesized Tl-doped BiVO4 nanoparticles displaying enhanced photodegradation of dye could find potential applications as visible light photocatalyst for the abatement of various organic pollutants.

Brilliant Yellow, Transparent Pure, and SiO2-Coated BiVO4 Nanoparticles Made in Flames

Transparent, yellow bismuth vanadate nanoparticles were made by flame spray pyrolysis. These materials are of special interest as brilliant yellow pigments. The structural properties of the as-prepared powders were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption, transmission electron microscopy, zeta potential measurements, and photospectroscopy. Depending on the particle collection temperature, either pale, amorphous materials or brilliant yellow-green, crystalline BiVO4 with particle size of about 50 nm were formed by direct calcination above 300 °C. The addition of Si during flame synthesis of BiVO4 resulted in smaller such crystals of about 20 nm that were embedded in silica. This prevented sintering of the BiVO4 particles during calcination at 400 °C and resulted in thermally stable, highly transparent, yellow particles.