Methylene Blue Degradation Reaction Research Articles

Novel 2D layered g-C3N4 nanocomposite materials for sustainable wastewater treatment by catalytic degradation of toxic dye

The photocatalytic degradation technique is one of the suitable ways of dealing with environmental pollutant decontamination. This study demonstrates the ability of graphitic carbon nitride (g-C3N4) nanocomposites containing tellurium (Te) and molybdenum disulfide (MoS2) to photocatalytically destroy organic cationic methylene blue (MB) dye, which is primarily used in the textile industry. Using the alkali treatment approach, layered graphitic carbon nitride (g-C3N4) was created. Using MoS2 and Te, several g-C3N4 nanocomposites were created using ultrasonic calcination techniques. After the MoS2 and Te were immobilized individually, the composites underwent a methodical characterization process utilizing a variety of instruments, including XRD and SEM. Using a 2D layered nano-g-C3N4 substrate, the photo-catalytic degradation reaction of MB was observed, and a UV spectrophotometer was used to determine the absorbance of the MB dye. Using 0.2 % MoS2/g-C3N4 and 5 % Te/g-C3N4, the photocatalytic degradation efficiency of the MB dye (10, 15, and 20 mg/L) solution was examined. In comparison to other produced nanocomposites, the 5 % Te/g-C3N4 composite was shown to have the highest photocatalytic activity in terms of dye degradation ability, and about 100 % of the MB dyes were degraded in less than 60 minutes. As the concentration of MB increased, the dye degradation efficiency of g-C3N4 nanocomposites steadily dropped, and the degradation rate of MB was around 1.5 mg/L.

Coal Fly Ash‐based P Zeolite‐anchored CuxO as an Efficient Catalyst for Heterogeneous Photo‐Fenton Degradation of Methylene Blue

AbstractThe environmental quality has been given more attention because of the potential hazards brought by urbanization and industrialization. Therefore, this study proposed a comprehensive utilization method for treating dye wastewater using solid waste. P zeolite was prepared using coal fly ash (CFA), and then anchored with CuxO as catalyst (CuxO/P) for heterogeneous Fenton‐like degradation of methylene blue (MB) under ultraviolet irradiation (UV). Compared with P zeolite and CuO, the catalyst CuxO/P showed the highest degradation efficiency of MB in combination with H2O2 and UV (98.3 %) after 90 min of reaction. This can be attributed to the involvement of copper component and the dispersion of P zeolite as the carrier. The MB degradation reaction was consistent with first‐order kinetics. The sum of the rate constant k in the CuxO/P+H2O2 (0.0030 min−1) and CuxO/P+UV (0.0035 min−1) system is much lower than that in the CuxO/P+H2O2+UV system (0.0491 min−1), indicating a strong synergistic effect among CuxO/P, H2O2, and UV. Meanwhile, the catalyst CuxO/P with excellent stability and renewability presented a degradation efficiency of over 95 % in 5 cycles, exhibiting considerable application prospects in dye wastewater treatment. Furthermore, the most effectively radical was ⋅OH generated by catalytic H2O2. This work provided a new perspective for the reuse of coal fly ash. It would be one of the most efficient and comprehensive utilization ways to treat wastewater with solid waste.

Preparation of magnetic nanoparticles as photo‒Fenton catalysts by a hydrothermal‒assisted thermal treatment method

The magnetic CoFe2O4 nanoparticles, prepared by hydrothermal method combining with the heat treatment at 600oC, were used to act as a photo‒Fenton catalyst in the methylene blue (MB) degradation reaction. The composition, structure, and surface morphology of the prepared materials were studied by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FESEM), and energy-dispersive X-ray (EDX) spectroscopy. The optical properties of CoFe2O4 before and after calcination, analyzed by UV-Vis diffuse reflectance (DRS) spectroscopy, demonstrated that after heating at 600oC, the structure and crystallinity of CoFe2O4 were increased. The calcination process also caused the CoFe2O4 sintering to grow to a larger size, thereby reducing the surface area of the CoFe2O4 after calcination compared to the original ones. This value was determined through nitrogen the adsorption‒desorption isotherms curve. The magnetism of CoFe2O4 before and after calcination was studied by vibrating sample magnetometer (VSM). After sintering at 600oC, the saturation magnetization (Ms) and residual magnetism (Mr) of CoFe2O4 were higher than those of the original. The Fenton photocatalytic performance was evaluated by MB degradation reaction under UVA radiation in the presence of oxalic acid as an active free radical generating agent. In the methylene blue degradation reaction at room temperature, the prepared CoFe2O4 catalyst showed the maximum degradation efficiency of 97% for MB and the reaction yields were almost unchanged after three consecutive reactions. This method promised in making ferrite materials for water treatment based on some advantages such as simple process, low cost, and environmentally friendly solvent usage.

Modeling, optimization and characterization of titanium dioxide thin film prepared by the spin-coating method using the experimental design for an application of photocatalytic degradation of methylene blue

This work focuses on modeling and optimizing the deposition of a TiO2 film on ITO glass using the spin-coating method and experimental design. The parameters studied include the concentration of the solution, speed and duration of rotation, drying temperatures and time, and calcination temperature and time. Results show that optimal conditions are achieved at 457 g/l concentration, 1020 rpm speed, 43 s duration of rotation, 100 °C drying temperature for 30 s, and 500 °C calcination temperature for 2 h. XRD, FTIR, EDX, and SEM analyses of the TiO2/ITO film indicate crystallization in the anatase phase with a 29.3 nm crystal size and around 80% deposition quality, with good surface adhesion and a thickness of approximately 30 nm. The photocatalytic activity of the thin film for the decomposition of methylene blue (MB) in water was also studied. Results showed a 70% degradation of MB after 4.5 h, which was confirmed by absorption spectra and discoloration of MB. Additionally, the degradation reaction of MB by TiO2 followed the pseudo-first-order, with good agreement between the kinetic study and a high degradation rate constant (k1deg = 0.2919 (h−1)), indicating a rapid process. Finally, a photodegradation mechanism of MB was reported.

Photocatalytic performance under visible light of WS2/TiO2/Au synthesized by hydrothermal method

In this study, transition metal dichalcogenide (TMD) material WS2 and Au nanoparticles were combined with TiO2 to enhance the photocatalytic performance under visible light. The WS2 nanosheets were synthesized from bulk WS2 via ultrasonic process, and the Au nanoparticles were prepared through the reduction reaction from HAuCl4. The composite photocatalysts of WS2/TiO2/Au, TiO2/Au, and WS2/TiO2 were synthesized by a one-step hydrothermal process. The light absorption property of the composites was determined by ultraviolet-visible (UV-vis) photospectroscopy. Surface analysis of WS2 nanosheet, TiO2 nanoparticles, and Au nanoparticles was performed by scanning electron microscopy (SEM). The chemical structure of composites and thickness of WS2 nanosheets were analyzed by Raman spectra. The photocatalytic activity was measured by methylene blue degradation reaction under visible light. These results revealed the photocatalytic behavior of WS2/TiO2/Au, TiO2/Au, and WS2/TiO2 composites, as well as WS2 nanosheets. The WS2/TiO2/Au composite showed improved photocatalytic behavior among all samples. It is believed that the WS2 nanosheet and Au nanoparticle extend the light absorption range from UV region to the visible region, as well as the WS2/TiO2/Au composite reduces the recombination of electrons. This study shows that the enhanced photocatalytic behavior of WS2/TiO2/Au composite can be used as photocatalytic applications in the future.

Interfacial coupling effects on adsorptive and photocatalytic performances for photoresponsive graphene-wrapped SrTiO3@Ag under UV–visible light: experimental and DFT approach

Understanding the graphene/semiconductor/metal interactions is crucial to design innovative photocatalytic materials with efficient photocatalytic activity for environmental cleanup applications. SrTiO3 on reduced graphene oxide (rGO) with various graphene contents was successfully synthesized in this study utilizing a simple hydrothermal method, followed by decorating the surface with Ag particles by using the photodeposition process. Under UV-visible light irradiation, the resulting composites were tested for their improved photocatalytic activity to decompose methylene blue (MB). The prepared photocatalysts were characterized by XRD, SEM, EDX, DLS, FT-IR, Raman spectroscopy, and DRS. First-principle density functional theory calculations (DFT) were also carried out by using the generalized gradient approximation (GGA) and PBE functional with the addition of on-site Coulomb correction (GGA + U). The obtained SrTiO3/rGO@Ag composites showed great improvement in the photocatalytic performances over pristine SrTiO3. For the degradation reaction of MB, SrTiO3/rGO20%@Ag4% composites yielded the best photocatalytic activity with efficacy reach 94%, which was also shown that it could be recycled up to four times with nearly unchanged photocatalytic activity.

Magnetic recoverable Cu/CuFe2O4 nanocomposite as an efficient catalyst for 4-nitrophenol reduction and methylene blue degradation

In this study, the magnetic Cu/CuFe2O4 nanocomposite was successfully prepared by a one-pot solvothermal method and evaluated for catalytic activity in the 4-nitrophenol (4-NP) reduction reaction and methylene blue (MB) degradation reaction. The structure, surface morphology, and properties of this catalyst were characterized by using several physicochemical methods such as Powder X-ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectroscopy (DRS), Brunauer–Emmett–Teller (BET), field emission scanning electron microscopy (FE-SEM), EDX mapping, and vibrating sample magnetometer (VSM). The Cu/CuFe2O4 catalyst is spherical in shape with an average diameter of about 145 nm and a BET surface area (SBET) of 52 m2.g-1. In both the 4-NP reduction and MB degradation reactions, this nanocomposite material showed high catalytic activity. The yield of 4-NP reduction reaction in the presence of NaBH4 was 82% after 5 minutes. In this reaction, Cu metal both plays the role of direct electron transfer from BH4- ions to 4-NP and participates in and promotes the electron transfer process between Cu+-Cu2+ and Fe2+-Fe3+ ion pairs in CuFe2O4. For MB degradation reaction, under the stimulation of UVA radiation with the presence of oxalic acid (H2C2O4) as a free radical-generating agent, the reaction yield was 98% after 40 minutes. In this process, Cu is an electron donor to reduce Fe3+ to Fe2+ in the CuFe2O4 structure, contributing to promoting the formation of highly active free radicals to decompose MB. The catalytic efficiency, crystal structure, and morphology of Cu/CuFe2O4 nanocomposite were stable over five consecutive uses in both two reactions.

The impact of H2O/C2H5OH solvents on the properties of Fenton CuFe2O4 photocatalysts for the degradation reaction of methylene blue

This paper reported a simple method of co-precipitation in aqueous and ethanol solvent systems to prepare a catalyze CuFe2O4 heterogeneous Fenton used for the degradation reaction of methylene blue (MB). The mixtures of oxalate precursors were prepared from the corresponding sulfate salts and oxalic acid in the solvent system of H2O/C2H5OH. The heat treatment of the precursor mixtures was carried out at 600, 700, and 800 oC in the surrounding atmosphere. The change in the volume ratio of water and ethanol with the tendency to gradually decrease the volume of water lead to a decrease in the polarity of the solvent and affected the precursors' precipitation as well as the solid phase reaction. The decrease in the solvent polarity resulted in a slight increase of the particle size and a reduction of the crystallinity. The experimental results showed that the water-ethanol solvent system had the effect of reducing the degree of dispersion in terms of the particle size. Meanwhile, the increase of the precursor calcination temperature resulted in the increased grain size and the higher concentration of Fe3+ ions on the surface compared with samples heat-treated at 600 and 800 oC. Samples, prepared from the solvent system with the ethanol-water volume of 50% or 70%, and then were calcined at 700 oC, showed good catalytic ability for the MB decomposition reaction irradiated by UVA rays and oxalic acid being used as an oxidizing agent. The MB processing efficiency after 90 minutes was 85%.

Structural, Morphological and Optical Behavior of Green Synthesized NiO Nanoparticle for Methylene Blue Photo-Degradation

Green synthesis methodology was used in this report to prepare the NiO nanoparticle for methylene blue (MB) dye photodegradation reaction. Various analytical performances were used to determine the physiochemical performance of the prepared NiO nanoparticle. The NiO nanoparticle has particle range of 20—30 nm with energy gap of 3.38 eV. The degradation efficiency against MB dye was evaluated and degradation under various environmental conditions were studied. The elemental scavenging test was conducted to understand the possible reaction mechanism for MB degradation reaction. As a result, we believe that this green synthesis NiO can open up new avenues for photocatalytic preparation and environmental remediation.

Strategy to Design-Synthesize Bimetallic Nanostructures Using the Alcohol Reduction Method.

Bimetallic nanomaterials have attracted much attention from various fields such as catalysis, optics, magnetism, and so forth. The functionality of such particles is influenced very much by the intermetallic interactions than their individual contribution. However, compared with the synthesis of monometallic nanoparticles, the reaction parameters that need to be controlled for tuning the size, shape, composition, and crystal structure of bimetallic nanoparticles becomes challenging. This study focuses on synthesizing of bimetallic nanostructures using the alcohol reduction method, where the control over the reducing power is conceivable by varying the combination of the alcohol type, complexing agent, and metal salts. Consequently, various Cu-Co nanostructures such as Cu-Co core-shell (size ranged between 40 and 15 nm) and hollow alloy nanoparticles and nanotubes were successfully synthesized by incorporating diffusion and etching phenomena during the reduction reaction. Moreover, time-resolved sampling revealed that the formation of a Cu-Co alloy hollow nanostructure has been realized by the diffusion of the Cu core into the Co shell by controlling the reduction time gap between Cu and Co and the crystal structure besides the reduction sequences. It should be noted that the synthesis of a high-temperature (∼1300 °C) Cu-Co alloy phase was carried out at 170 °C. Among the Cu-Co alloy nanostructures, Cu-Co hollow alloy nanoparticles exhibited enhanced catalytic activity compared to metallic Cu and other Cu-Co nanostructures from the degradation reaction of methylene blue. The enhanced catalytic performance was considered to be mainly due to the alloy structure.

Catalytic performance of boron-containing magnetic metal nanoparticles in methylene blue degradation reaction and mixture with other pollutants

The catalytic effects of metal nanoparticles (MNPs) synthesized in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) microemulsion system by using M(II) salts (M = Fe, Co, Ni) and NaBH4 reducing agent on methylene blue (MB) degradation reaction were investigated. It was determined that Co-MNPs gave the best catalytic activity among them. Influence of the reaction parameters e.g., reaction time, temperature, the size of catalyst and the MNP types on the catalytic performance were studied. It was found that 37 ± 6 nm Co-MNPs revealed the best catalytic activity in all studies. The best activation parameters were calculated as 13.6 ± 1.1 kJ mol−1 and ΔH = 10.7 ± 1.0 kJ mol−1 and ΔS = -87.9 ± 5.4 J mol−1 K−1. The activity % of Co-MNPs was calculated as 85.4 after 30 days on the shelf life study. The reusability studies were carried out and the activity of Co-MNPs at the 5th reuse was calculated as 70 ± 5%. Finally, the catalytic activity of Co-MNPs was investigated inside equal volumes of single and multiple solution mixtures containing MB, 4-Nitrophenol (4-NP) and Eosin Y (EY). In the examinations, it was observed that the nanocatalyst was effective as a reducing agent in all equal amount solutions (MB/4-NP, MB/EY, 4-NP/EY, and MB/4-NP/EY). And also, TOF (mole of MB/4-NP/EY) (mol catalyst.min)−1 values ​​of catalytic activities were also calculated.

Facile large scale synthesis of CuCr2O4/CuO nanocomposite using MOF route for photocatalytic degradation of methylene blue and tetracycline under visible light

MIL‐101(Cr) template method has been employed successfully to synthesize CuCr2O4/CuO composite. The synthesized sample was characterized by powder X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), high‐resolution transmission electron microscopy (HR‐TEM), scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy, N2 adsorption–desorption isotherm (BET) analysis, and UV vis‐ diffuse reflectance spectroscopy (UV‐DRS). The photocatalytic efficiency of the nanocomposite was evaluated towards the degradation of methylene blue (MB) dye and antibiotic tetracycline (TC) solution. The morphological studies confirmed that the CuO was uniformly dispersed on the CuCr2O4 matrix. The CuCr2O4/CuO nanocomposite showed high degradation efficiency of about 90% in the presence of H2O2 where the MB degradation reaction got completed in a mere 35 min and ~95% TC got degraded within 120 min.

Platinum nanoparticle decorated rutile titania synthesized by surfactant free hydrothermal method for visible light catalysis for dye degradation and hydrogen production study

Rutile phase of titanium oxide and platinum nanoparticle decorated rutile titania is prepared by a surfactant free hydrothermal process in acidic condition. The pure rutile phase of TiO2 particle is forms the specific cauliflower morphology. Hydrothermal process in presence of specific acid addition led to the formation of cauli-flower shaped rutile phase of titania. The efficiency and solar assisted photo catalytic ability of these materials are tested for methylene blue degradation as well as hydrogen generation by methanol reforming process. The X-ray diffraction of pattern of pure rutile phase formation is confirmed by reported JCPDS data. The surface physico-chemical property of prepared rutile Titania is further characterized by BET, Raman and SEM analysis. The HR-TEM of the prepared samples show the reduced particle size for rutile titania and studied their morphology in detail. Solar light assisted methylene blue degradation reaction was carrying out to study the catalytic efficiency towards dye degradation and kinetic activity of the same for prepared commercial titania and pure rutile TiO2. The platinum loaded and photo deposited rutile Titania is further analyzed for hydrogen production reaction by methanol reforming process. The rate of hydrogen evolution on platinum nanoparticle photo deposited on reforming process shows more than 900 μmol/g compared to pristine rutile titania catalysts.

MODIFICATION OF IRON OXIDE CATALYSTS SUPPORTED ON THE BIOMASS BASED ACTIVATED CARBON FOR DEGRADATION OF DYE WASTEWATER

Methylene blue is one of the dyes in textile industries which has a negative impact on the environment. This compound is very stable, so it is difficult to degrade naturally. Methylene blue can be harmful to the environment if it is in a very large concentration, because it can increase the value of Chemical Oxygen Demand (COD) which can damage the balance of environment ecosystem. Adsorption method by using activated carbon as the adsorbent is one of the most efficient and effective techniques in dye removal due to its large adsorption capacity. However, the adsorption method using activated carbon only removes the pollutant compounds to other media or phases. Other method that can be used includes Advanced Oxidation Processes (AOPs). This method has the advantage of being able to degrade harmful compounds in the waste through oxidation (oxidative degradation) processes. One method of AOPs is the process by using Fenton reagents. This study was aimed to prepare and characterize iron oxide/porous activated carbon catalyst. The type of porous activated carbon used was carbon from biomass derived carbon with microporous character. This biomass carbon is obtained from renewable natural products, namely coconut shell.The kinetics and adsorption models in the material will be derived and evaluated from the research data. Based on the research, it can be concluded that catalytic degradation is very effective for degradation of dye wastewater. Methylene blue degradation increases with the use of Fe2O3/activated carbon catalyst and the addition of hydrogen peroxide as the Fenton reagent. In addition, the pore structure difference in the catalyst also had a significant effect on the methylene blue degradation reaction resulting in increased capacity of methylene blue degradation reactions.

Manganese-Containing Nanostructured Oxide Coatings on Titanium Formed by Plasma Electrolytic Oxidation

Nanostructured manganese-containing oxide coatings on titanium were formed by method of plasma electrolytic oxidation in tetraborate aqueous electrolyte containing manganese acetate with and without the acetonitrile addition. These oxide layers with high content of manganese and coated by ordered "leaf-like" mesh nanostructures are formed in the electrolyte without acetonitrile addition. The oxide layers are displayed high acitivity towards oxidation CO and photoactivity in the degradation reaction of methylene blue. The addition of acetonitrile into electrolyte results in the change in the morphology of the coating surface, a significant reduction in the manganese content and, as a consequence, practical loss of activity in the oxidation of CO in CO2 and a reduction in the photocatalytic activity in the decomposition of methylene blue.

Comparison of Threshold Power between Methylene Blue Degradation and KI Oxidation Reaction Using Ultrasound

Ultrasound is used in various chemical reaction processes, and these reactions are influenced by ultrasonic frequency. A threshold power is required for the ultrasonic degradation reaction and oxidation reaction caused by hydroxyl radicals, and the cavitation threshold power is also influenced by frequency generally. In this study, the effects of frequency on the threshold power of methylene blue degradation and KI oxidation were investigated in the range between 22.8 kHz and 1640 kHz. The threshold power of KI oxidation reaction increased with increasing frequency. This phenomenon well agrees with previous study, and it is revealed that the generation of I- 3 ion is caused by oxidation reaction of Iˉ ions with hydroxyl radicals. On the other hand, the threshold power of methylene blue degradation reaction was not affected by frequency. The ultrasonic degradation of methylene blue is considered to be caused by hydroxyl radicals, and there is a linear relationship between degradation rate constant and sonochemical efficiency value. However, it is guessed that the degradation of methylene blue is occurred inside cavitation bubble by pyrolysis at high frequency regions.

Synthesis of selenium doped TiO2/Ag composite thin films with enhanced photocatalytic performance under visible light irradiation

Abstract Selenium doped TiO 2 and Selenium doped TiO 2 /Ag composite thin films were fabricated by spin coating, followed by post annealing. The Ag concentration in the thin film composites was controlled. The XPS, XRD and electron microscopy characterization showed that Se 4+ and Ag 0 were successfully introduced into TiO 2 nanostructure. The catalytic performance of as-deposited thin films was investigated in methylene blue degradation reaction under visible light irradiation, and the relationship between Ag concentration and photocatalytic performance of the thin film composites was explored.

Effects of phosphorus-doping on energy band-gap, structural, surface, and photocatalytic characteristics of emulsion-based sol-gel derived TiO2 nano-powder

Different amounts of phosphorus (P)-doped TiO2 (PDT) nano-powders (P=0–10wt.%) were synthesized by following a new emulsion-based sol-gel (EBSG) route and calcined at 400°C–800°C for 6h. These calcined PDT powders were then thoroughly characterized by means of XRD, XPS, SEM, FT-IR, FT-Raman, DRS, BET surface area, zeta-potential, cyclic-voltammetry and photocatalytic evaluation using methylene blue (MB) as a model-pollutant and established the effects of phosphorous doping on structural, surface, band-gap energy, and photocatalytic characteristics of TiO2 nano-powder formed in EBSG route. The characterization results suggest that the EBSG derived TiO2 nano-powder after calcination at 400°C for 6h is in the form of anatase phase when it was doped with <8wt.% P, and it is in the amorphous state when doped with >8wt.% P. Furthermore, these EBSG derived PDT powders own high negative zeta-potentials, high specific surface areas (up to >250m2/g), and suitable band-gap energies (<3.34eV). Surprisingly, these PDT powders exhibit very high MB adsorption (up to 50%) from its aqueous 0.01mM, 0.02mM and 0.03mM solutions during 30min stirring in the dark, whereas, the commercial Degussa P-25 TiO2 nano-powder shows no adsorption. Among various photocatalysts investigated in this study, the 1wt.% P-doped TiO2 nano-powder formed in EBSG route exhibited the highest photocatalytic activity for MB degradation reaction.

Ag and N co-doped TiO2 nanostructured photocatalyst for printing and dyeing wastewater

Ag and N co-doped TiO2 nanoparticles were synthesized by the sol–gel method. Tetrabutyl titanate was used as the precursor, AgNO3 as the Ag source, and urea as the N source. When the sol was prepared, a 304 stainless steel mesh as the structured material was immerged into the solution. After calcinated at preset temperature, nanostructured photocatalysts were obtained. The photocatalysts were located at the internal shell of a continuous reactor that was designed for photocatalytic reaction. The degradation reaction of methylene blue was carried out in this reactor. The characteristics and doping dosage of the nanostructured photocatalysts were analyzed by thermogravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy. The degradation product samples were determined by UV–vis spectrometry. Finally, the photocatalytic efficiency was evaluated under batch and continuous reactors. The multifarious kinetic constants were determined under reaction conditions. The result illustrates that the degradation efficiency of methylene blue apparently increased.

Dip-coating deposition of resistive BiVO4 thin film and evaluation of their photoelectrochemical parameters under distinct sources illumination

Resistive monoclinic bismuth vanadate (BiVO4) nanocrystals in the form of thin films were obtained by the solution combustion synthesis coupled with the dip-coating deposition process. The structure, morphology, and optical properties of BiVO4 nanocrystals were characterized by means of x-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectroscopy. The photoelectrochemical properties were obtained by cyclic voltammetry and chronoamperometry techniques in potassium chloride (KCl) electrolyte solution under distinct visible light sources irradiation condition. Under blue InGaN light emitting diode (LED) irradiation, the electrode has a better efficiency, faster response time (260 ms), and faster decay time (65 ms), when compared with the irradiation by dichroic lamp. Besides, the photocurrent density (j ph) is approximately 39 times higher than j ph obtained under dichroic lamp. The performance analysis based on the methylene blue degradation reaction has shown that the BiVO4 material has higher electroactivity under InGaN LED irradiation condition, with estimated k obs value of 200 × 10−4 min−1, which is a little higher than the value obtained with dichroic lamp illumination. In the dark condition, the BiVO4 presented much lower photocatalytic activity.