Matched Band Structure Research Articles

Solvothermal synthesis of Ag2WO4/Sb2WO6 heterostructures for enhanced charge transfer properties and efficient visible-light-driven photocatalytic activity and stability

Visible-Light-Driven (VLD) photocatalysis for the dye waste water treatment is impeded by the immediate recombination effect and weak redox potential of the charge carriers. Here, we report the synthesis of silver and antimony tungstate-based novel hybrid composite (Ag2WO4/Sb2WO6) with significant charge carrier partition and strong redox potential for superior photocatalysis in an aqueous medium. The synthesized composite has a matching electronic band structure and synergistic effect—wherein, Ag2WO4 operates as an electron acceptor for Sb2WO6 which in return promotes photoelectron transfer; consequently, leading to charge partition and mitigation of electron-hole recombination. Relying upon the solvothermal approach, a fresh hertojunction was obtained via in-situ development of Sb2WO6 hierarchical structures on Ag2WO4 rods. Samples prepared were tested for their photocatalytic evaluation by degradation of non-azo dye rhodamine B (RhB) under visible-light subjection. The Ag2WO4/Sb2WO6 composite materials (comprising type 2 hetero-junction), displayed enhanced photocatalytic performance in comparison to the pristine Sb2WO6. In addition, the effect of the Ag2WO4 amount on photocatalytic activity was investigated. Among the four different compositions—9 wt%, 12 wt%, 15 wt%, and 18 wt% of Ag2WO4 in the composite (i.e., Ag2WO4/Sb2WO6), the composite with a 15 wt% composition of Ag2WO4 illustrated superior performance. In the case of the composite with 15-wt% of Ag2WO4, the photocatalytic degradation of RhB exhibits kapp value of 3.3 × 10−2 min-1 which is 5.4 times greater than kapp values of pristine Sb2WO6 (6.1 × 10-3 min-1). In the radical scavenger tests, ·OH and h+ were identified as the main reactive species—for which a possible photocatalytic mechanism is sketched to display the charge transfer and partition in Ag2WO4/Sb2WO6. Lastly, the composite catalyst revealed an excellent photostability with 86 % retention of photocatalytic efficiency after four catalytic cycles.

Alkaline induced indium gradient distribution in ZnmIn2S3+m/In(OH)3 heterojunction for improved photocatalytic H2 generation

Building a heterojunction composite which contains two or more semiconductors with matching energy band structures is an effective way to boost the photocatalytic performance. In this paper, a perfectly matching heterojunction constructed by semiconductors with a continuously changing energy band structure was demonstrated. It was found that migration of indium in layered ZnIn2S4 could be driven from the bulk to the surface under alkaline condition. Based on this, In(OH)3 was in situ grown on the surface of ZnIn2S4, and meanwhile, ZnIn2S4 was converted to ZnmIn2S3+m with m continuously variable. Due to the concentration gradient of indium, the conduction band (CB) of ZnmIn2S3+m/In(OH)3, which was formed by In5s5p orbitals mixed with Zn4s4p orbitals, displays a continuous change that can efficiently promote photogenerated charge separation and transfer.

Mechanochemical synthesis of a Z-scheme Bi2WO6/CuBi2O4 heterojunction and its visible-light photocatalytic degradation of ciprofloxacin

To efficiently remove the organic pollutants from water, the binary heterojunction photocatalytic hybrid Bi2WO6/CuBi2O4 was synthesized through a one-step mechanochemical operation. The results of XRD, FTIR and XPS analyses indicated that the formation of the binary components, as well as that of the heterojunction with a matched band structure, can be synchronously conducted in a solid-state system. The Bi2WO6/CuBi2O4 hybrids exhibited excellent photocatalytic activity towards ciprofloxacin (CIP) degradation under simulated sunlight (λ > 420 nm). The 10% Bi2WO6/CuBi2O4 sample showed the optimal photocatalytic activity by achieving over 90% degradation of CIP in 180 min with a rate constant of 0.01282 min−1. Electrochemical impedance spectroscopy, photocurrent response and Mott-Schottky analysis indicated that the hybrid exhibited high separation and migration efficiency of photogenerated charge carriers owing to its p–n heterojunction structure and the corresponding high redox capability. The study of the photocatalytic mechanism demonstrates that the charge transfer path conforms to the Z-scheme model, in which h+ and •O2− play a crucial role. This research provides strong practical support for the mechanochemical preparation of Z-scheme high-efficiency photocatalytic materials.

Three-dimensional bismuth oxide/red phosphorus heterojunction composite with enhanced photoreduction activity

In order to solve the problems of easy recombination of carriers and low efficiency of photocatalysis in red phosphorus photocatalyst, Bi2O3/HRP heterostructure composite photocatalyst was prepared by hydrothermal method. Cr(VI) was selected as the model contaminant to investigate the photoreduction activity of the photocatalysts. The experimental results revealed that the composite photocatalyst obtained at 3% Bi2O3 mass fraction (3%Bi2O3/HRP) exhibited the strongest photoreduction ability, and its rate constant was 14.9 and 50 times that of pure HRP and Bi2O3. The photoelectric conversion efficiency of the photocatalyst improved, which was illuminated by the high current density (16.7 and 42 times higher than that of HRP and Bi2O3) and the heterogeneous interface that facilitated charge transfer and separation. On the basis of the matched band structure of Bi2O3 and HRP, Bi2O3 with wide band gap (Eg) is introduced into HRP with narrow Eg to form a heterojunction structure, which provides an effective strategy to promote space charge separation and transfer.

High visible-light rhodamine B degradation activity over two-dimensional Bi2O2CO3/BiOCl heterojunction through the cohesive and efficient electronic transmission channel

Strategies of bridging electronic transmission channel have been widely applied in photocatalyst design to optimize the charge transportation processes. However, the contact area and interfacial interaction between two catalysts still required to be enlarged and strengthened to further improve that process. In this work, two-dimensional Bi2O2CO3/BiOCl composites were fabricated through a facile chemical method at room temperature. According to the photocatalytic activity evaluations, the optimized Bi2O2CO3/BiOCl composite exhibited excellent activity and achieved complete degradation of Rhodamine B (RhB) within 5 min while only 52% was degraded by Bi2O2CO3 in 25 min under visible light irradiation. The mechanism of enhanced activity were investigated and discussed in detail which can be attributed to two aspects. First, the matched band structure of Bi2O2CO3/BiOCl heterojunction provided new pathway for photo-induced electrons, which produced superoxide radical (·O2−) and hydroxyl radical (·OH) for degradation of RhB. Second, the in situ-formed BiOCl has strong cohesion with {001} facet of Bi2O2CO3 thus generating the stacked sandwich structure. This structure provided carriers with long lifetime with the assistance of electronic transmission channel formed between Bi2O2CO3 and BiOCl as well as a larger contact area. As a result, the interfacial charge recombination was efficiently suppressed. With these two factors, the visible-light-induced RhB degradation of Bi2O2CO3/BiOCl was promoted. This work provided an effective strategy for photocatalyst design. And the low cost and facile fabrication strategy also offered a promising potential of Bi-based catalyst in photocatalytic application.

Enhancing the photocatalytic performance of g-C<sub>3</sub>N<sub>4</sub> for the degradation of Rhodamine B by Bi<sub>2</sub>MoO<sub>6</sub> modification

In this paper, spherical morphology Bi2MoO6 was synthesized by hydrothermal method, and Bi2MoO6 and g-C3N4 were heat treated to prepare g-C3N4/Bi2MoO6 composite photocatalysts with different mass ratios. By means of X-ray diffraction, scanning electron microscope, ultraviolet-visible spectrophotometer and fluorescence spectrum, the microstructure, size and morphology and optical properties of the samples were analyzed. The ideal matching band structures between g-C3N4 and Bi2MoO6 promote the carrier transfer, thus reducing the recombination rate of photo-generated electrons and holes, and improving the separation rate of photo-generated electrons and holes, so as to improve photocatalytic activity. Under visible light, g-C3N4/Bi2MoO6 composites show high degradation activity of Rhodamine B, and the photocatalytic performance is significantly improved than that of pure g-C3N4 and Bi2MoO6. The sample of the g-C3N4/Bi2MoO6 with mass ratio of 10% shows the best photocatalytic degradation performance, which is 6.5 and 3.3 times of g-C3N4 and Bi2MoO6, respectively.

Vertical α/β-Ga2O3 phase junction nanorods array with graphene-silver nanowire hybrid conductive electrode for high-performance self-powered solar-blind photodetectors

Gallium oxide semiconductor, with a bandgap energy of 4.9 eV, is regarded as a hopeful candidate for next-generation solar-blind photodetectors. However, the construction of photodetector based on Ga2O3 pn junction is still challengeable due to immature doping technology of p-Ga2O3. By considering the small lattice mismatch (＜3%) and similar band gap structure of α-Ga2O3 and β-Ga2O3, a well-designed solar-blind photodetector was built, based on vertical α/β-Ga2O3 junction nanorod arrays (NRAs) with a graphene-silver nanowires (Ag NWs) hybrid top electrode. Thanks to the high conductivity and optical transmittance of graphene-Ag NWs top electrode, the photodetector based on α/β-Ga2O3 junction NARs displayed excellent photoelectric performance. Meanwhile, the matched band structure of Π type formed at the interface of α/β-Ga2O3 junction promoted the automatic separation of photogenerated carriers and their transfer to the corresponding electrodes. A fast photoresponse time of 0.54 s, a high light-to-dark ratio about 2000, and a high rejection ratio (R254/R365) of 2.7 × 103 under the zero bias, were realized. The excellent photoelectrical performance of α/β-Ga2O3 junction photodetector even in vacuum environment forecasts its potential application in some low air density fields, such as missile early warning and tracking and ozone hole monitoring.

Designing a 0D/2D S-Scheme Heterojunction over Polymeric Carbon Nitride for Visible-Light Photocatalytic Inactivation of Bacteria.

Constructing heterojunctions between two semiconductors with matched band structure is an effective strategy to acquire high-efficiency photocatalysts. The S-scheme heterojunction system has shown great potential in facilitating separation and transfer of photogenerated carriers, as well as acquiring strong photoredox ability. Herein, a 0D/2D S-Scheme heterojunction material involving CeO2 quantum dots and polymeric carbon nitride (CeO2 /PCN) is designed and constructed by in situ wet chemistry with subsequent heat treatment. This S-scheme heterojunction material shows high-efficiency photocatalytic sterilization rate (88.1 %) towards Staphylococcus aureus (S. aureus) under visible-light irradiation (λ≥420 nm), which is 2.7 and 8.2 times that of pure CeO2 (32.2 %) and PCN (10.7 %), respectively. Strong evidence of S-scheme charge transfer path is verified by theoretical calculations, in situ irradiated X-ray photoelectron spectroscopy, and electron paramagnetic resonance.

Designing a 0D/2D S‐Scheme Heterojunction over Polymeric Carbon Nitride for Visible‐Light Photocatalytic Inactivation of Bacteria

AbstractConstructing heterojunctions between two semiconductors with matched band structure is an effective strategy to acquire high‐efficiency photocatalysts. The S‐scheme heterojunction system has shown great potential in facilitating separation and transfer of photogenerated carriers, as well as acquiring strong photoredox ability. Herein, a 0D/2D S‐Scheme heterojunction material involving CeO2quantum dots and polymeric carbon nitride (CeO2/PCN) is designed and constructed by in situ wet chemistry with subsequent heat treatment. This S‐scheme heterojunction material shows high‐efficiency photocatalytic sterilization rate (88.1 %) towards Staphylococcus aureus (S. aureus) under visible‐light irradiation (λ≥420 nm), which is 2.7 and 8.2 times that of pure CeO2(32.2 %) and PCN (10.7 %), respectively. Strong evidence of S‐scheme charge transfer path is verified by theoretical calculations, in situ irradiated X‐ray photoelectron spectroscopy, and electron paramagnetic resonance.

Performance and Matching Band Structure Analysis of Tandem Organic Solar Cells Using Machine Learning Approaches

Organic solar cells (OSCs) based on tandem configuration have been drastically studied for boosting power conversion efficiency (PCE) in the the past decade and are a potential improvement to current commercial photovoltaic solar cell technology. Although a series of promising efficiency achievements on tandem OSCs have been reported, the crucial issue is how to estimate tandem OSCs performance based on known physical properties of different photoactive materials. Herein, a set of electronic features of photovoltaic materials is trained using machine‐learning algorithms for accurate efficiency predictions of tandem OSCs. The well‐trained machine‐learning model presented herein aims at 1) designing the matching band structures of active blends in each sub‐cell and 2) identifying the characteristics of the materials to be used to achieve high PCE values. The machine‐learning approach provides an effective strategy for suggesting the ideal properties of photovoltaic materials in terms of highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), and bandgap, which is useful for the rational design of high‐efficiency tandem OSCs.

In situ preparation of p-n BiOI@Bi5O7I heterojunction for enhanced PFOA photocatalytic degradation under simulated solar light irradiation

• BiOI@Bi 5 O 7 I p-n heterojunction was constructed by in-situ phase transition. • The p-n BiOI@Bi 5 O 7 I efficiently degraded PFOA under visible light irradiation. • The matched band structures of BiOI and Bi 5 O 7 I favor photoinduced carrier separation. • OH and O 2 − were the main-radicals responsible for PFOA degradation. The strong persistence, wide presence and potential toxicities of perfluorooctanoic acid (PFOA) in aquatic environment makes it a challenge to develop advanced technologies to eliminate it from water. In this study, novel BiOI@Bi 5 O 7 I p-n heterojunction photocatalysts were facilely prepared by calcinating BiOI at 350 °C < T < 410 °C. Under simulated solar light irradiation, the degradation rate constant ( k = 0.247 h −1 ) of PFOA by the BiOI@Bi 5 O 7 I heterojunction prepared at 390 °C (T-390) was four times of that by pristine BiOI ( k = 0.061 h −1 ) and 1.2 times of that by Bi 5 O 7 I (prepared at 410 °C, k = 0.206 h −1 ). T-390 also exhibited excellent mineralization efficiency by removing about 60% of total organic carbon in 6 h of irradiation. The significantly enhanced photocatalytic activity of BiOI@Bi 5 O 7 I composite was mainly attributed by the unique band gap structure of the p-n heterojunction, which enhanced the visible-light absorbance and accelerated the separation of photogenerated charge carriers. The generated intermediate products were analyzed by ultra-performance liquid chromatography-mass spectrometry, and the results indicated that PFOA was decomposed by stepwise losing CF 2 units. The BiOI@Bi 5 O 7 I heterojunction also possessed very good durability and reusability, displaying a great potential in PFOA containing water treatment.

Novel BP/BiOBr S-scheme nano-heterojunction for enhanced visible-light photocatalytic tetracycline removal and oxygen evolution activity

Designing heterojunction photocatalysts with strong interfacial interaction and matched band structure is an effective way to reduce the recombination of photogenerated carriers. Herein, the exfoliated black phosphorus (BP) nanosheets were coupled with BiOBr nanosheets having higher Fermi level, and thereby it constructed a novel layered BP/BiOBr nano-heterojunction with chemically bonding, larger contact interface and unique band structures. BiOBr nanosheets were self-assembled on the surface of BP nanosheets by a facile liquid-phase ultrasound combined with solvothermal method. The photocatalytic performance for tetracycline (TC) degradation, oxygen evolution and H2O2 production rate of Sol-10BP/BiOBr was 7.8, 7.0 and 2.6 times than that of pure BiOBr, respectively. The in-situ generated H2O2 and OH became the main active species of mineralization and decomposition of TC. The novel S-scheme two-dimensional BP/BiOBr nano-heterojunction for boosting spatial charge separation retained the useful holes-electrons with higher redox ability, which was very beneficial for producing more OH, H2O2 and O2, and the photocatalytic activity was greatly improved.

Improving the stability and photocatalytic activity of AgI via constructing novel Bi12O17Cl2/AgI composite

Abstract A novel visible-light-driven Bi12O17Cl2/AgI composite was synthesized by a deposition-precipitation method at room temperature. Dispersing AgI on Bi12O17Cl2 substrate endows AgI achieve excellent stability and visible-light photocatalytic activity for degrading methyl orange (MO) and phenol. The transient photocurrent, electrochemical impedance spectra and photoluminescence spectra results indicated that the matching interactive energy band structures of AgI and Bi12O17Cl2 made Bi12O17Cl2 can act as a highly efficient electron trap to prevent the photoelectrons coupling with the interstitial Ag+ to form metallic Ag0, ensuring the stability. Simultaneously, the electron-hole separation efficiency enhanced, resulting in the outstanding photocatalytic activity. The novel Bi12O17Cl2/AgI will be a potential composite photocatalyst with high stability and efficiency for environmental purification.

Construction of heterojunction Bi/Bi5O7I/Sn3O4 for efficient noble-metal-free Z-scheme photocatalytic H2 evolution

A growing number of semiconductor photocatalysts have been recently reported to enhance the hydrogen evolution performance, but most of them need to work with noble metals. In this study, we constructed a ternary photocatalyst of Bi/Bi5O7I/Sn3O4 without noble metals, which can achieve a comparable or even better performance than noble metals. Bi5O7I and Sn3O4 construct a direct Z schema heterojunction due to the matched band structure, further improving the separation efficiency of electrons and holes, which greatly improves the hydrogen production performance of Sn3O4. Moreover, the superior H2 evolution activity was achieved by metal Bi with a uniform distribution, which not only extends the light absorption range but also acts as a co-catalyst to further improve the hydrogen evolution. This work provides a new method designed for noble-metal-free photocatalytic hydrogen evolution.

Adsorption–photocatalytical remediation for series of tetracycline contaminants with BiOCl–CdS composite under simulated sunlight

Abstract Tetracycline antibiotics (TCs) are widely released into the aqueous environments and thus pose much serious threats to aquatic ecosystem and human healthy. Due to their heteroaromatic stable frame structure, the removal of TCs has always been an arduous task. In this investigation, we have successfully prepared a series of BiOCl–CdS composites which were used to well remedy the TCs pollutions. BiOCl presented 3D hierarchical microspheres and CdS nanoparticles were uniformly dispersed on its leave surface, confirming by the characterization of XRD, XPS, TEM, SEM and EDS techniques. Compared with pure BiOCl and CdS, the BiOCl–CdS composite exhibits highly adsorption–photocatalytic degradation toward the removal of TCs under solar light illuminating, reaching up to 91.2% for TC, 83.7% for OTC, 75.1% for CTC, within 60 min, respectively. Based on the UV diffuse spectrum, photoelectrochemical measurements, band potential calculation, LC-MS testing, the active species trapping, a novel adsorption–photocatalytic mechanism is proposed. BiOCl, with 3D hierarchical microspheres, possesses not only excellent adsorption towards TCs through a chelation but also good photo-oxidative ability due to the very positive band potential. When compositing with CdS nanoparticles, the matched band structure could not only expand the solar spectrum harvest but also boost the separation of photogenerated electrons and holes, enhancing the solar light driven photocatalytic activity. In summary, the designed material could be potential commercial application to remedy antibiotic residues from the domestic waste water or industrial discharge driven by solar lighting, with a low cost, easy manipulation, and high efficiency.

Interfacial Engineering for the Fast Carrier Tunneling Channel by a Novelty Quaternary Layered Photoanode

Developing an advanced photoanode structure to decrease the charge recombination is a mandatory requirement to enhance charge separation and transfer for photoelectrochemical reactions. Herein, we report an interfacial engineering design of quaternary layered Bi2S3/Bi2Mo2O9/Bi2S3/Bi2Mo2O9 by using a successive ionic layer absorption and reaction method. The synergistic effect of double p–n junctions combined with the Z-scheme system by band structure matching is the key point for this novelty design. The double p–n junctions can reinforce the charge separation when the semiconductor absorbs photons. The third ultrathin interlayer Bi2Mo2O9 sandwiched between two Bi2S3 layers plays a role as a carriers’ tunneling channel thanks to the Z-scheme system, which can accelerate the directional flowing of the electron and hole in the bilayer Bi2S3. Such a quaternary layered structure will be a “highway” for the electron transfer to the bulk, and the transfer of holes is to the surface where water oxidation takes p...

Novel g-C3N4/g-C3N4 S-scheme isotype heterojunction for improved photocatalytic hydrogen generation

Rationally designing heterostructure is a promising way to promote the charge carrier separation of intrinsic photocatalysts, thus contributes the improvement of solar to chemical energy conversion. Herein, a novel isotype heterojunction consisted of MCN and UCN, respectively derived from hydrothermally-treated melamine and urea, was synthesized. Owing to the well compatibility and matched band structure, an S-scheme charge transfer mechanism is confirmed for working on MCN/UCN isotype heterojunction, thus endowing strong redox ability, efficient charge carrier separation efficiency and prolonged lifetime. As a result, MCN/UCN exhibits improved photocatalytic water splitting activity under visible light irradiation, which displays approximately 5.5 and 1.8-fold enhancement as compared to the pure MCN and UCN, respectively. The rationally synthesized S-scheme isotype heterojunction will pave the way for developing highly efficient g-C3N4-based photocatalysts.

A label-free photoelectrochemical aptasensing platform base on plasmon Au coupling with MOF-derived In2O3@g-C3N4 nanoarchitectures for tetracycline detection

A label-free photoelectrochemical (PEC) aptasensor for tetracycline (Tc) detection was successfully fabricated, and plasmon Au coupling with MOF-derived In2O3@g-C3N4 nanoarchitectures (AuInCN) with excellent PEC performance was employed as matrix for the first time. The homogeneous In2O3 nanoparticles (In2O3 NPs) derived from MIL-68(In) precursor were synthesized via calcination in air. The g-C3N4 nanosheets provided a favorable substrate for the fine distribution of In2O3 NPs. The In2O3@g-C3N4 (InCN) heterojunction with compact interface and matching band structure, facilitated the separation and transfer of electron-hole pairs. The surface plasmon resonance (SPR) of gold nanoparticles (Au NPs) could improve the light absorption and the photoelectron transfer of the modified electrode. Meanwhile, the decorated cysteamine stabilized Au NPs were also adequate to immobilize the SH-terminated aptamer as a biorecognition unit, and Tc molecules could be trapped through the specific interaction with the immobilized aptamer. An enhanced PEC photocurrent was realized under visible light illumination, due to the oxidation of captured Tc by photo-generated holes. Thereby, the concentration of Tc could be detected by observing the changes of photocurrent signals. Under optimized conditions, the PEC aptasensor exhibited the linear range from 0.01 nmol L−1 to 500 nmol L−1, with a detection limit (S/N = 3) of 3.3 pmol L−1. The prepared PEC aptasensor demonstrated acceptable stability, specificity and reproducibility, indicating the potential applications for the detection of Tc.

Ag-Bridged Z-Scheme 2D/2D Bi5FeTi3O15/g-C3N4 Heterojunction for Enhanced Photocatalysis: Mediator-Induced Interfacial Charge Transfer and Mechanism Insights.

Heterojunction photocatalysts have attracted widespread interest in photocatalysis because of their high-efficiency interfacial charge-transfer characteristics of nanoarchitectures. In this study, Ag-bridged 2D/2D Bi5FeTi3O15/ultrathin g-C3N4 Z-scheme heterojunction photocatalysts with powerful interfacial charge transfer has been synthesized via a facile ultrasound method coupled with a photoreduction strategy for efficient photocatalytic degradation of antibiotics. The morphology analysis displays that the bridged Ag nanoparticles were anchored on the interface of layered Bi5FeTi3O15 and ultrathin g-C3N4 nanosheets. Owing to its unique 2D/2D ternary heterostructure, the Bi5FeTi3O15/2%Ag/10% ultrathin g-C3N4 composite exhibited the best tetracycline degradation performance under visible-light and simulated solar irradiation. Meanwhile, the intermediates and degradation pathways were proposed by a liquid-phase mass spectrometry system. Characterizations and density functional theory studies together verify that the matched band structure of Bi5FeTi3O15 and g-C3N4 could induce a superfast Z-scheme interfacial charge-transfer path. More importantly, bridged Ag nanoparticles in the 2D/2D heterojunction extended the light absorption range and prolonged the lifetime of photogenerated electron-holes induced by Bi5FeTi3O15. This work affords a promising approach for designing multicomponent Z-scheme heterojunction photocatalysts for highly efficient photocatalytic application.

Construction of M-BiVO4/T-BiVO4 isotype heterojunction for enhanced photocatalytic degradation of Norfloxacine and Oxygen evolution reaction

To conquer the issues of poor compatibility, confined intimate contact and limited improvement of charge anti-recombination process of a traditional heterojunction formed by interfacing of two different semiconductors, a simplistic strategy has been espoused for the fabrication of isotype heterojunction flanked with two dissimilar crystal phases of a single semiconducting material. Herein, we account the fabrication of an in-situ formed M-BiVO4/T-BiVO4 (MT-BiVO4) isotype heterojunction by a simple co-precipitation method followed by altering the calcinations temperatures. The physico-chemical properties of the fabricated MT-BiVO4 isotype hetrojunctions were analyzed by using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–Visible Diffuse reflectance spectroscopy (UV–Vis DRS) techniques. The FESEM image of MT-BiVO4 photodeposited by Au and MnOx particles was provided strong evidence for the spatial separation of photogenerated charge carriers between M and T phase of BiVO4 in an isotype heterojunction. The interfacing of T-BiVO4 with M-BiVO4 in an isotype heterojunction affords the well-built close contact between them was confirmed by the High resolution transmission electron microscopy (HRTEM) analysis. The photocatalytic reactions of all the prepared MT-BiVO4 isotype heterojunctions were examined by monitoring the degradation of Norfloxacine and oxygen evolution reaction under visible light irradiation. The optimized 65% MT-BiVO4 isotype heterojunction discloses higher photocatalytic activity around 91% of Norfloxacine degradation in 150 min and 808 µmol of O2 evolution in 2 h under visible light irradiation. On the other hand, the photoelectrochemical measurements reveals that the optimized 65% MT-BiVO4 isotype heterojunction exhibits superior photocurrent i.e. 584 µA/cm2 which is approximately 5.1 and 25.3 times higher than the neat T-BiVO4 and M-BiVO4, and these results are well consistent with the photocatalytic activities. The higher PEC and photocatalytic activities are due to the well-built close contact, superior compatibility and matching band structure between T-BiVO4 and M-BiVO4, which provides strapping driving force for the efficient enhancement of charge separation process. The Electrochemical impedance spectroscopy (EIS), photoluminescence (PL), photoelectrochemical (PEC) and bode analysis confirms the effectual diminish of charge recombination process in MT-BiVO4 isotype heterojunction relative to the neat materials. The chronoamperometric analysis authenticated that the isotype heterojunctions are more stable than the neat materials.