Monoclinic Scheelite Structure Research Articles

Effect of Laser Energy Density on Photophysical and Photocatalytic Properties of BiVO4 Single‐Crystal Thin Film

Effect of Laser Energy Density on Photophysical and Photocatalytic Properties of BiVO₄ Single‐Crystal Thin Film

High-performance memristor for energy-efficient artificial optoelectronic synapse based on BiVO4 nanosheets

Artificial optoelectronic synapses have drawn extensive attention owing to their ability to combine the optical and electrical responses. Those photosensitive materials that has been reported in memristors have the potential to be adopted in such optoelectronic synapses. Herein, optoelectronic synapses can be achieved based on two-terminal memristors by using two-dimensional (2D) BiVO4 with monoclinic scheelite (m-BiVO4) structure as the memristive layer. The fabricated memristors exhibit bipolar resistive switching (RS) characteristics with stable retention and reliable endurance performance. Furthermore, both electrical and optical synaptic functions can be achieved based on the memristors, such as long-term potentiation (LTP) and depression (LTD) stimulated by the voltages pulses as well as short-term and long-term memory under the light stimulation. More importantly, owing to the LTP and LTD functions with high symmetry, linearity and good repeatability of the LTP/LTD cycles, the artificial neural network can be simulated to achieve image recognition with a high accuracy for handwritten digits. Moreover, both the electrical and optical synapses can be used to emulate the “learning-forgetting” behaviors of human brain. Remarkably, the energy consumption per synaptic event in the optical and electrical modes can be calculated, indicating potential applications in energy-efficient synaptic devices. The m-BiVO4 nanosheets not only demonstrate good non-volatile RS behaviors but also implement energy-efficient optoelectronic synaptic functions, providing a promising strategy for applications in future neuromorphic computing.

Effect of annealing temperature on bismuth vanadate nano thin films for solar cell applications

Bismuth vanadate (BiVO4) has been used as the photoanode electrodes in ferroelectric solar cells owing to its unique combination of properties: a narrow bandgap among ferroelectrics, economic viability, negative conduction band edge, and remarkable stability. The present work explores the fabrication and characterization of BiVO4 thin films prepared via spin coating, with a specific focus on elucidating the influence of the annealing temperature (400–550 °C) on their structural, optical, and photovoltaic properties. From X-ray diffraction (XRD) analysis, it is observed that higher annealing temperatures have promoted the formation of larger grains, enhanced crystallinity, and induced a preferred crystal orientation characteristic of the monoclinic scheelite structure. Tauc plot analysis shows the dependence of the optical band gap on the annealing temperature for BiVO4 thin films. The band gap values have decreased slightly from 2.50 eV at 400 °C to 2.44 eV at 550 °C. This is indicated by the slightly narrowed bandgap, which influences the structure of the material or defect states at higher annealing temperatures. A narrower bandgap allows for the absorption of lower-energy light, potentially improving the light absorption efficiency of BiVO4 thin films in photoanode applications. The influence of annealing temperature on BiVO₄ thin film solar cell performance was investigated further through the analysis of open-circuit voltage (Voc), short-circuit current (Isc) and power conversion efficiency.

Template assisted hydrothermal synthesis of bismuth vanadate for Rhodamine B photodegradation

Developmental and technological activities result in uncontrollable release of synthetic dyes into water reservoirs posing potential threat to flora and fauna. Thus, the development of suitable process to treat these waste effluents is urgently needed. Herein, a facile technique was employed to synthesize bismuth vanadate (BiVO4) by incorporating Chitosan (Cs) and Triblock pluronic 123 (P) as directing agents through the hydrothermal process and its efficacy as a photocatalyst was tested for Rhodamine B (RhB) photodegradation. It is noteworthy that the use of Cs as template during the synthesis of BiVO4 had not been previously documented. The synthesized materials were subject to a comprehensive array of characterization techniques, including XRD, FTIR, UV–visible diffuse reflection, SEM, TEM, N2 adsorption isotherm, and XPS analyses. The outcomes revealed that the synthesized catalysts have a monoclinic scheelite structure and displayed an irregular morphology. In addition, the particle size decreased remarkably with the use of Cs. The XPS revealed that the templates have a major influence on the surface charge of the material, as revealed by point of zero charge (pHPZC) analysis. Notably, BiVO4-Cs exhibited the highest specific surface area (SSA: 12.27 m2/g) among them. The synthesized photocatalysts exhibited high catalytic stability. Additionally, the photocatalysts showed excellent RhB photodegradation performance of 94.2 and 64.4 % under UV-B and visible light illumination, respectively.

Studies on the effect of Tb doping on the structural and optical properties of La2(WO4)3 nanoparticles

Pristine and terbium ion-doped lanthanum tungstate nanoparticles were synthesized by the chemical precipitation method. In the present work, the effect of Tb doping on the structural and optical properties of lanthanum tungstate nanoparticles is studied. The structure and surface morphology of the prepared samples were analysed using the X-ray diffraction technique and scanning electron microscopy technique. Both the samples exhibit monoclinic scheelite structure. The optical properties of the samples were studied using UV–Visible absorption spectroscopy and photoluminescence spectroscopy. By Tb ion doping, the optical bandgap value reduces and the colour of emission of the sample changes from blue to green region.

Novel B‐site scheelite structure ceramic Bi(Ge0.5Mo0.5)O4 and its dielectric properties

AbstractScheelite structure phase inorganic oxides show their irreplaceable role in numerous application areas due to their clear structure and superior properties, especially in dielectrics. Scheelite structure phase BiVO4 has been permanently studied but substitutions, modifications, and explorations of novel phases persist hitherto and inspire more interest. In this work, we report a novel Scheelite structure phase of Bi(Ge0.5Mo0.5)O4 and a detailed study of both structural analysis and dielectric properties investigation. Bi(Ge0.5Mo0.5)O4 adopts the monoclinic Scheelite structure, identical to BiVO4, with a dielectric permittivity of ∼ 35, Qf value of ∼20 000 GHz, and TCF value of ‒46 ppm/°C. No secondary ferroelastic transition was seen in Bi(Ge0.5Mo0.5)O4 till 600°C, close to its synthetical temperature. The results indicate the success of discovering a new Scheelite structure phase and its prior engineering potential in modifying and substituting BiVO4 over the dielectric area, photocatalyst, ion conductor, and so forth.

Defect assisted enhanced nonlinear optical performance and optical limiting of pure and doped BiVO4 powders and nanocomposite films

The linear and nonlinear absorption properties, photoluminescence and optical limiting properties of bismuth vanadate (BiVO4) powders and films were presented in this work. The structural, morphological and optical effects of different doping elements (M: Mo,W and Ni) were investigated (M: BiVO4). XRD and Raman results proved that BiVO4 and M: BiVO4 powders were synthesized in the monoclinic scheelite structure. Twhe powder morphology as found to be changed by Ni and W doping. The nonlinear optical responses of pure and M: BiVO4 were studied using the open aperture Z-scan experiment and a theoretical model was used to determine the nonlinear optical absorption performance. The nonlinear absorption coefficient (βeff) values were found to be 6.59 × 104, 8.86 × 104, 2.26 × 105 and 1.62 × 106 cm/GW for BiVO4, Mo: BiVO4, W: BiVO4 and Ni: BiVO4 nanocomposite films, respectively. The highest nonlinear absorption coefficients (βeff) and saturation intensity thresholds (ISAT) were obtained for Ni:BiVO4 film. Experimental results showed that the βeff value and band gap can be controlled by the dopant element, making doped BiVO4 a good candidate for nonlinear optical applications such as optical limiters, optical switches and modulators in integrated photonic devices.

Visible light-induced Silver and Lanthanum co-doped BiVO4 nanoparticles for photocatalytic dye degradation of organic pollutants

• Ag and La-doped BiVO 4 have been synthesized by a simple hydrothermal route. • The photocatalytic activity of samples was examined using XyO and Rh-B. • The doped materials showed enhanced degradation efficiency. The photocatalytic degradation of Xylenol orange (XyO) and Rhodamine B (Rh-B) is investigated in this study using the heterogeneous photocatalytic method. Silver (Ag) and Lanthanum (La) co-doped BiVO 4 photocatalysts have been synthesized using hydrothermal methods. In this study, the effect of Ag and La doping on the crystal structure, morphology and photocatalytic properties of the BiVO 4 nanoparticles have been investigated. The synthesized photocatalysts have a monoclinic scheelite structure. The pinecone-shaped Ag/La-BiVO 4 particles have shown an increased photocatalytic activity, which is thought to be due to its narrow bandgap energy, porous structure and strong visible light absorption. The photoluminescence intensity of the doped BiVO 4 has decreased significantly when compared to pure BiVO 4 due to the quenching of photoemission in the presence of Ag and La, which improves the efficiency of photocatalytic dye degradation. The time-resolved PL decay obeyed a triexponential pattern with a maximum lifetime of 90.95 ns. The doped materials showed enhanced degradation efficiency of 93% and 95% for XyO and Rh-B followed by a pseudo-first-order rate constant of 0.014 min −1 . This study will benefit in the rapid and low-cost preparation of Ag/La-BiVO 4 for photocatalytic degradation of water pollutants.

Deposition of nanoporous BiVO4 thin-film photocatalyst by reactive magnetron sputtering: Effect of total pressure and substrate

Nanoporous BiVO4 thin films were deposited using reactive magnetron sputtering in Ar and O2 atmosphere, on various substrates, employing pulsed direct-current (DC) power supplies applied to metallic Bi and V targets for rapid deposition. The procedure was followed by a post-annealing treatment in air to crystallize the photoactive monoclinic scheelite structure. The influence of total pressure and substrate on the crystal structure, morphology, microstructure, optical and photocatalytic properties of the films was investigated. The crystallization of monoclinic scheelite structure deposited on fused silica substrate starts at 250 °C and the films are stable up to 600 °C. The morphology of the films is rather dense, despite at the high sputtering pressure (>2 Pa), with embedded nanopores. Among the thin films deposited on fused silica, the one deposited at 4.5 Pa exhibits the highest porosity (52%), with the lowest bandgap (2.44 eV) and it shows the highest photocatalytic activity in the degradation of Rhodamine-B (26% after 7 h) under visible light irradiation. The film deposited on the silicon substrate exhibits the highest photoactivity (53% after 7 h). Lack of hypsochromic shift in the UV−Vis temporal absorption spectra shows the dominance of the chromophore cleavage pathway in the photodecomposition.

Enhanced photocatalytic degradation of tetracycline antibiotic using m-BiVO4 photocatalyst under visible light irradiation

The monoclinic Bismuth Vanadate (m-BiVO4) photocatalyst was synthesized via hydrothermal technique. The characterization studies confirmed that the m-BiVO4 exhibits monoclinic scheelite structure, twinning star-like morphology and high optical absorption. The photodegradation of Tetracycline (TC) using m-BiVO4 reveals that degradation efficiency of 96% and rate constant of 0.029 min−1 were achieved at 60 min of visible-light irradiation. The rate constant for m-BiVO4 is 2.23 times greater than the commercially available TiO2 owing to small crystallite size and narrow bandgap. These excellent characteristics strongly suggest that the prepared m-BiVO4 may serve as better photocatalyst for the removal of antibiotic pollutants from wastewater.

Photocatalytic degradation of organic dye over bismuth vanadate–silicon dioxide–graphene oxide nanocomposite under visible light irradiation

A novel bismuth vanadate–silicon dioxide–graphene oxide (BiVO4/SiO2/GO) nanocomposite was synthesized successfully by using hydrothermal method. The as-prepared nanocomposite was characterized by various techniques, including X-ray diffraction (XRD), field emission scanning electron microscope (SEM), and Brunauer–Emmett–Teller (BET). The photocatalytic activity of nanoparticles was evaluated by measuring the removal efficiency of methylene blue (MB) in aqueous solution under visible light irradiation. The results indicated that BiVO4, BiVO4/SiO2, and BiVO4/SiO2/GO exhibited the same diffraction peaks of monoclinic scheelite structure due to the higher content of BiVO4 in the nanocomposite system. The BiVO4 and BiVO4/SiO2 were uniformly agglomerated from irregular particles with the different level of aggregation and the size of several micrometers. In the meantime, BiVO4 and SiO2 particles were adhered firmly on the GO sheets in BiVO4/SiO2/GO nanocomposite. The BiVO4/SiO2/GO nanocomposite showed a much higher efficiency than the pure BiVO4 and the BiVO4/SiO2 hybrid material for MB removal efficiency due to the considerably increased specific surface area and pore size by the adhesion of BiVO4 and SiO2 on GO sheets.

Ultra-selective, trace level detection of As3+ ions in blood samples using PANI coated BiVO4 modified SPCE via differential pulse anode stripping voltammetry.

We report a novel, facile hydrothermal synthesis of bismuth vanadate (BiVO4) nanoflakes coated with polyaniline (PANI) via electrodeposition on screen-printed carbon electrode (SPCE) for trace level detection of arsenic in biological samples. The crystallinity and monoclinic scheelite structure of as-synthesised BiVO4 nanoflakes was analysed using X-Ray diffraction (XRD) and the surface morphology and chemical analysis of the flake-like BiVO4 and PANI coated BiVO4 modified SPCE (PANI@BiVO4/SPCE) were studied using Field emission scanning electron microscopy (FESEM), Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). The presence of VO4 tetrahedra and VO43- group along with oxy-functional groups were confirmed using Raman and FTIR analysis, respectively. Under optimized conditions, the sensor could detect As3+ ions via differential pulse anodic stripping voltammetry (DPASV) technique with remarkable low limit of detection (LOD) of 0.0072ppb (which is far below the MCL testified values) and exhibited a sensitivity of 6.06μAppb-1cm-2 for a linear range of 0.01 to 300ppb. This improved sensing aptitude can be ascribed to the synergetic effect of PANI and BiVO4 by providing high electrical conductivity and high electrocatalytic active sites via VO43- tetrahedra, respectively. The sensor showed an outstanding selectivity in detection of As3+ ions in trace levels in simulated blood serum samples with excellent recovery percentages thus making it an ideal platform to develop numerous electrochemical sensing platforms for bioanalytical applications.

Rational fabrication of needle with spherical shape ternary reduced Graphene Oxide-HoVO4-TiO2 photocatalyst for degradation of ibuprofen under visible light

The photocatalytic decomposition is a highly efficient method for removing environmental pollution. Reduced graphene oxide (rGO) loaded HoVO4-TiO2 was prepared hydrothermally and characterized by XRD, FE-SEM, EDX, TEM, XPS, FT-Raman spectral analysis, FT-IR and UV-DRS. The powder XRD confirmed the formation of the anatase structure of the TiO2 and monoclinic scheelite structure of HoVO4. FE-SEM images of rGO-HoVO4-TiO2 depicted a mixed needle and spherical structure. DRS spectra of rGO and HoVO4 in rGO-HoVO4-TiO2 composite increased its visible absorbance region. The photocatalytic study revealed an enhanced photodecomposition efficiency of rGO-HoVO4-TiO2 composite material than HoVO4, TiO2, rGO-HoVO4, rGO-TiO2 at pH 7 in the removal of ibuprofen. The effects of operational parameters such as the catalyst amount, ibuprofen concentration have been analyzed and compared with the previous reports. The degradation mechanism is proposed for ibuprofen under visible light illumination. Moreover, the rGO-HoVO4-TiO2 catalyst has excellent stability and the photocatalytic decomposition of ibuprofen mainly depends on superoxide radicals photogenerated from rGO-HoVO4-TiO2 under visible light illumination. The antibacterial activity was investigated against Staphylococcus aureus, staphylococcus pyogenes, Bacillus subtilis, and Escherichia coli and the catalyst has good to moderate activity.

Photocatalytic activity for degradation of sulfamethoxazole by Bivo4 using visible light

In this study, B1VO4 photocatalysts have been successfully synthesized by hydrothermal method and were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffusion reflectance spectra (UV-Vis DRS), and Raman spectroscopy. From XRD, Raman, and UV-Vis DRS results, the as-synthesized B1VO4 showed monoclinic scheelite structure and narrow band gap energy (Eg = 2.35 eV). The morphology of as-prepared powder showed a small crystallite size with different shapes. The photocatalytic performances of the as-prepared sample were evaluated by the degradation of sulfamethoxazole under visible light. Also, H2O2 was added to enhance the photocatalytic activity of BiVO4. It has been noticed that 70% photodegradation of antibiotic occurs on the catalyst surface with visible light irradiation. Besides, the effects of pH and organic salts are also discussed in this study.

Role of rGO to improve the performance of BiVO4 nanostructures for efficient removal of heavy metals

The fabrication of efficient visible light-driven photocatalysts has gained much attention for the removal of heavy metals from water to resolve the water crises of the world by utilizing visible light in the context to resolve energy issues. Reduced graphene oxide/bismuth vanadate nano-photocatalysts were prepared by facile hydrothermal method. Various characterization techniques, including X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), UV–Vis absorption spectroscopy (UV–Vis), photoluminescence emission spectroscopy (Koci et al. Appl Catal B 96(3–4):239–244, 2010), photocatalytic removal of heavy metals were utilized to explore the morphology, crystal structure, elemental composition, optical properties, and photocatalytic activity measurement. XRD patterns showed the monoclinic scheelite and tetragonal scheelite structure of prepared composite, while the average size of particles calculated by diffraction peaks were ranging from 25.3 to 36.5 nm. SEM micrographs showed the spherical, oval, cuboid morphology of prepared composite with average size of particles ranging from 26 to 35 nm with best accord to XRD results. The reduction in size may be very beneficial for the transportation of electrons on reduced graphene sheet interstitial sites and take part in photocatalytic performance and enhanced the removal of heavy metals. UV–Vis spectra showed the absorption of prepared composite resulting in reduction of bandgap from 2.41 to 2.13 eV with the increasing content of graphene oxide in bismuth vanadate. PL emission spectra display the suppressed recombination of charge carriers, when incorporating with reduced graphene oxide. These results show the increase in the separated charge carriers and resulting in enhanced photocatalytic activity. As prepared rGO/BiVO4 composite exhibits the high photocatalytic removal of heavy metals, because of the extended visible light adsorption, high surface to volume ratio, and increased separated charge carriers of prepared composite. This research provides a different vision to construct promising photocatalysts for the removal of heavy metals from water.

Wool roving textured reduced graphene oxide-HoVO4-ZnO nanocomposite for photocatalytic and supercapacitor performance

Reduced graphene oxide-HoVO4-ZnO nanocomposite was prepared via simple hydrothermal method and characterized by X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive Spectroscopy (EDX), High-Resolution Transmission Electron Microscopy (HR-TEM), X-Ray Photoelectron Spectroscopy (XPS), FT-Raman, UV–Visible Diffuse Reflectance Spectroscopy (DRS), Electrochemical impedance spectroscopy and Cyclic Voltammogram(CV). The XRD pattern confirmed the formation of hexagonal wurtzite structure of ZnO and monoclinic scheelite structure of HoVO4. FE-SEM images depicted the Wool roving textured reduced Graphene Oxide-HoVO4-ZnO catalyst. As prepared rGO-HoVO4-ZnO exhibits highest photodegradation efficiency achieving at 97.2% and 98% for ibuprofen (IBF)and ciprofloxacin (CIP) respectively in 60 min under UV light illumination. Superoxide radicals (O•-2) play an important role in the decomposition of IBF and CIP. Prepared catalysts were found to be stable and reusable even after six consecutive cycles without loss of catalyst. Also Besides, the electrochemical efficiency and galvanostatic charge-discharge of the rGO-HoVO4-ZnO and HoVO4-ZnO composites electrode materials were evaluated by cyclic voltammetry. rGO-HoVO4-ZnO composite showed higher specific capacitance of 322 Fg-1, compared to HoVO4-ZnO (252 Fg-1) in neutral aqueous electrolyte. The enhancement of specific capacitance of the composite electrode is mainly due to the interconnected conductive network as well as synergism of rGO. The experimental results reveal that rGO-HoVO4-ZnO material is an efficient electrode material for high-performance supercapacitors.

Photocatalytic degradation of paracetamol on Pd–BiVO4 under visible light irradiation

In this study, Pd–BiVO4 bearing highly dispersed Pd nanoparticles was prepared from pure BiVO4 using an impregnation method. The pure BiVO4 and Pd–BiVO4 catalysts were characterized by X-ray diffraction, scanning electron microscopy, UV–visible diffuse reflection, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results showed that the prepared catalysts had a monoclinic scheelite structure and exhibited a flake-like morphology. Pd–BiVO4 showed a distinct response in the visible light region, with an extended absorption edge at 550 nm. According to the Scherrer formula, the nanocrystal particle sizes of the BiVO4 and Pd–BiVO4 catalysts were 35 and 28 nm, respectively. Highly dispersed Pd nanoparticles with sizes of 2.5 ± 0.5 nm were observed on the BiVO4 surface. Two Pd valence states, Pd(II) and Pd(0), were identified in a 2:1 ratio. Pd–BiVO4 exhibited excellent activity for paracetamol (PCT) degradation, with 100% removal achieved in 1 h under visible light irradiation. During degradation, the mineralization ratio reached up to 40% total organic carbon removal. Two highly active species, namely, hydroxyl and superoxide radicals, were determined by electron spin resonance (ESR). Furthermore, the potential degradation of PCT in this system was proposed based on intermediate information obtained using HPLC-MS and Gauss analysis. The high dispersion and small size of Pd nanoparticles might favor the removal of emerging contaminants using the Pd–BiVO4 photocatalytic system.

Microwave dielectric properties of temperature‐stable zircon‐type (Bi, Ce)VO4 solid solution ceramics

AbstractIn the (Bi1 − xCex)VO4 (0 ≤ x ≤ 1) system, we found that the (Bi1 − xCex)VO4 (0 ≤ x ≤ 0.1) belongs to the monoclinic scheelite phase and the (Bi1 − xCex)VO4 (0.7 ≤ x ≤ 1) belongs to the tetragonal zircon phase, while the (Bi1 − xCex)VO4 (0.1 < x < 0.7) belongs to the mixed phases of both monoclinic scheelite and tetragonal zircon structure. Interestingly, two components with near‐zero temperature coefficient of resonant frequency (TCF) appeared in this system. In our previous work, a near‐zero TCF of ~+15 ppm/°C was obtained in a (Bi0.75Ce0.25)VO4 ceramic with a permittivity (εr) of ~47.9 and a Qf (Q = quality factor = 1/dielectric loss; f = resonant frequency) value of ~18 000 GHz (at 7.6 GHz). Furthermore, in the present work, another temperature‐stable microwave dielectric ceramic was obtained in (Bi0.05Ce0.95)VO4 composition sintered at 950°C and exhibits good microwave dielectric properties with a εr of ~11.9, a Qf of ~22 360 GHz (at 10.6 GHz), and a near‐zero TCF of ~+6.6 ppm/°C. The results indicate that this system might be an interesting candidate for microwave device applications.

Electrodeposition, optical and photoelectrochemical properties of BiVO4 and BiVO4/WO3 films

BiVO4 films and BiVO4/WO3 heterostructure have been obtained by electrosynthesis method with the use of interferometric control of the thickness of films during their electrodeposition. The electrodeposition of BiVO4 films involves the electrochemical stage of oxidation of VO2+ to H2VO4− and the chemical interaction of BiO+ with H2VO4−. It has been established that the as-deposited film contains up to 25% water by means of two-beam interferometry, DTA and TGA. The films containing BiVO4 and WO3 after annealing at 500 °C are crystallized to a monoclinic scheelite structure. It is found that the photoelectrochemical efficiency of crystalline BiVO4 films depends on their thickness. It is shown that the quantum efficiency (η = 0.30–0.65) at λ = 400–450 nm is observed for BiVO4/WO3 heterostructure with a BiVO4 film thickness of 140 nm and WO3 layer of 500 nm. The WO3 layer makes an additional contribution to photocurrent in the fundamental absorption region and increases the overall photoelectrochemical efficiency in the UV and the near-visible regions.

Synthesized BiVO4 was by the co-precipitation method for Rhodamine B degradation under visible light

Recently, BiVO4 photocatalysts has been received much attention in field of catalysts. Because it can be used to degrade harmful organic catalysts in visible light, irradiation produces CO2, H2O and less harmful organic matter. In this study, we have successfully synthesized a BiVO4 photocatalysts via co-precipitation method in the presence of urea and different calcined temperatures. The survey calcined temperatures as 300°C; 350°C; 400°C and 450°C. The obtained materials were characterized by Scanning electron microscope (SEM) and X-ray diffraction (XRD). The photocatalytic activity was evaluated by the photocatalytic degradation of rhodamine B (RhB) degradation under visible compact Philip lamp (40W) light irradiation. The result indicates that all samples calcined are monoclinic scheelite structure of BiVO4. The BiVO4-350°C sample performed the best in the photodegradation of RhB.