Bi2WO6 Nanosheets Research Articles

Enabling Interfacial Lattice Matching by Selective Epitaxial Growth of CuS Crystals on Bi2WO6 Nanosheets for Efficient CO2 Photoreduction into Solar Fuels.

Photocatalytic CO2 reduction serves as an important technology for value-added solar fuel production; however, it is generally limited by interfacial charge transport. To address this limitation, a two-dimensional/two-dimensional (2D/2D) p-n heterojunction CuS-Bi2WO6 (CS-BWO) with highly connected and matched interfacial lattices was designed via a two-step hydrothermal tandem synthesis strategy. The integration of CuS with BWO created a robust interface electric field and provided fast charge transfer channels due to the work function difference, as well as highly connected and matched interfacial lattices. The p-n heterojunctionpromotedelectron transfer from the Cu to Bi sites, leading to coordination of Bi sites with high electronic density and low oxidation state. The Bi sites in BWO nanosheets facilitated the adsorption and activation of CO2, and generation of high-coverage key intermediate b-CO32-, while broad light-harvesting CuS (CS)provide abundant photoinduced electrons that were injected into the conduction band of BWO for CO2 photoreduction reaction. Remarkably, the p-n heterojunction CS-BWO exhibited CO and CH4 yields of 135.7 and 62.5 µmol g-1, respectively, which were significantly higher than those of CS, BWO, and physical mixture CS-BWO nanosheets. This work provided an innovative design strategy for developing high-activity heterojunction photocatalyst for converting CO2into value-added solar fuels.

Ultrathin 2D/2D MoS2/Bi2WO6 S-scheme heterojunction for boosting photocatalytic degradation of ciprofloxacin

A series of 2D/2D MoS2/Bi2WO6 S-scheme heterojunctions consisting of ultrathin MoS2 nanosheets (MS, 1.6 nm) and ultrathin Bi2WO6 nanosheets (BWO, 1.5 nm) were developed for photocatalytic degradation of ciprofloxacin. The samples with 5 % mass ratio of MS (5 %MS/BWO) exhibits the almost complete degradation of ciprofloxacin (≈100 %) under visible light. It is evidenced that the formation of S-scheme heterojunction with close interfacial interaction facilitates the photoinduced carrier separation and the generation of surface acid sites. The activation of ciprofloxacin molecules is realized through the coordinately interaction of C-N and C=O with the surface W sites. Moreover, the OVs in BWO side is a convenient pathway for activated of O2, embodying in the generation of •O2− and •OH under visible light over photocatalyst. Such an association of charge transfer mechanism with coordination activation shows the enhanced photocatalytic performance toward ciprofloxacin. This work provides a motivation which designs an S-scheme heterojunction photocatalyst with the ability to activate the specific group in molecules to comprehend the degradation of antibiotics.

Wavelength-dependent photoelectrochemical sensor array based on Bi2WO6/TiO2 electrospun nanoheterojunction for multiple antioxidants identification and total antioxidant capacity analysis in natural tea

Evaluating total antioxidant capacity (TAC) have been playing a vital role in health guidelines, the analysis of nutritional composition in foods, and the diagnosis and treatment of oxidative stress-induced disease. However, numerous antioxidants with similar physicochemical properties make them very difficult to be discriminated because of the similarly analytical signal output. In this work, a novel wavelength-dependent and three-channel photoelectrochemical (PEC) sensor array based on Bi2WO6/Vo-TiO2 electrospun nanostructures was established for the identification of antioxidants in natural teas. The formation of heterojunction interfaces between Bi2WO6 nanosheet and Vo-TiO2 NFs, and the introduction of the oxygen vacancies in TiO2 NFs promoted the visible light absorption ability and electron transfer rate of Bi2WO6/Vo-TiO2 NFs, causing the differences of photocurrent response to different antioxidants under different wavelengths. Furthermore, excited wavelengths, antioxidant types, and photocurrent were regarded as three-factors of fingerprint to accurately discriminate five antioxidants via linear discriminant analysis (LDA). Finally, the PEC sensor array was able to estimate TAC in five actual tea samples (green, yellow, black, white, and dark teas). This development of LDA-assisted multiplex PEC fingerprinting sensor array showed a good promise for the identification and authentication of agricultural products, and the establishment of the database.

Hierarchical MXene (Nb2C, V2C)/Bi2WO6 heterostructure via face-to-face coupling for enhanced pollutant removal

To improve the photocatalytic performance of single-phase Bi2WO6, the heterojunction construction is usually employed to effectively separate and transport photo-induced carriers. Herein, MXene/Bi2WO6 heterojunction (NB2 and VB2) with face-to-face contact and hierarchical structure was constructed by growing ultrafine Bi2WO6 nanosheets on the surface of two-dimensional MXene (Nb2C and V2C) materials. Compared with the original Bi2WO6, the hybrids exhibited a larger specific surface area (42.17 m2∙g−1 for NB2, 50.15 m2∙g−1 for VB2), and displayed significant enhancements in the photodegradation of anionic MO (13.8-fold, 6.5-fold), cationic RhB (9.1-fold, 4.5-fold), and neutral phenol (8.5-fold, 6.1-fold), respectively. This is mainly attributed to the heterostructures via face-to-face coupling which can facilitate the tuning of the photoresponsive properties and internal energy level structure, as well as the generation of free radicals (•O2-, •OH, and h+) for the stepwise redox process in photodegradation. Therefore, this work is expected to expand the diverse use of Non-Ti3C2 MXene in photocatalysis, meanwhile provide important guidance for the harmless treatment of organic pollutants.

Preparation of core-shell like Bi2WO6/BiOCl heterojunction with excellent visible light photocatalytic activity

Constructing a ‘Z-scheme’ heterojunction is an effective method for improving photocatalyst activity. Core-shell like Z-scheme Bi2WO6/BiOCl heterojunction was synthesized through a two-step method. The arbutus-like BiOCl microsphere core was first gained by a solvothermal method. Then the Bi2WO6 nanosheet shell was in situ on the surface of the BiOCl microsphere through another solvothermal process. The Bi2WO6/BiOCl heterojunction had a much better photocatalytic performance than that of the single Bi2WO6, which was owing to the enlarged BET surface area, enhanced light absorption, and photocarriers migration. The photocatalytic mechanism of the Bi2WO6/BiOCl heterojunction was also proposed.

Customized Ultrathin Oxygen Vacancy-Rich Bi2W0.2Mo0.8O6 Nanosheets Enabling a Stepwise Charge Separation Relay and Exposure of Lewis Acid Sites toward Broad-Spectrum Photothermal Catalysis.

Designing robust photocatalysts with broad light absorption, effective charge separation, and sufficient reactive sites is critical for achieving efficient solar energy conversion. However, realizing these aims simultaneously through a single material modulation approach poses a challenge. Here, a 2D ultrathin oxygen vacancy (Ov)-rich Bi2W0.2Mo0.8O6 solid solution photocatalyst is designed and fabricated to tackle the dilemma through component and structure optimization. Specifically, the construction of a solid solution with ultrathin structure initially facilitates the separation of photoinduced electron-hole pairs, while the introduction of Ov strengthens such separation. In the meantime, the presence of Ov extends light absorption to the NIR region, triggering a photothermal effect that further enhances the charge separation and accelerates the redox reaction. As such, photoinduced charge carriers in the Ov-Bi2W0.2Mo0.8O6 are separated step by step via the synergistic action of 2D solid solution, OV, and solar heating. Furthermore, the introduction of OV exposes surface metal sites that serve as reactive Lewis acid sites, promoting the adsorption and activation of toluene. Consequently, the designed Ov-Bi2W0.2Mo0.8O6 reveals an enhanced photothermal catalytic toluene oxidation rate of 2445µmolg-1h-1 under a wide spectrum without extra heat input. The performance is 9.0 and 3.9 times that of Bi2WO6 and Bi2MoO6 nanosheets, respectively.

In-situ deposition of Ag and AgFeO2 on Bi2WO6 nanosheet for enhancing visible-light-driven photocatalysis toward degradation of tetracycline

A series of novel ternary Bi2WO6/Ag/AgFeO2 composites were successfully prepared by in-situ deposition AgFeO2 onto Bi2WO6 nanosheets, followed by reduction of Ag+ to Ag0 on the surface of Bi2WO6/AgFeO2 via ultrasound-assisted reduction process. The structural characterizations revealed that Ag0 and AgFeO2 was loaded on the smooth surface of Bi2WO6 nanosheets, forming a tightly contact interface. Meanwhile, Bi2WO6 nanosheets as substrates suppressed the aggregation of AgFeO2 nanoparticles. Bi2WO6/Ag/AgFeO2 composites achieved full-spectrum absorption of visible light due to the formation of p-n heterojunction between the Bi2WO6 and AgFeO2 interface and the local surface plasmon resonance (LSPR) of Ag0, as confirmed by UV–vis DRS. Photoelectrochemical results indicated that the formation of both p-n heterojunction and the noble Ag0 improved the separation efficiency of photogenerated electrons and holes. Photocatalysis performance of Bi2WO6/Ag/AgFeO2-80 composite showed that a removal rate of 92.4 % for tetracycline hydrochloride (TC-HCl) under visible light irradiation within 120 minutes, with a kinetic constant 0.01743 min-1, which was 20 times, 15 times, and 3 times higher than that of AgFeO2, Ag/AgFeO2 and Bi2WO6, respectively, and the composite exhibited excellent stability in the fourth cycle experiment. The radical capture experiments proved that superoxide radicals (⸱O2-) play a major role in the degradation process, and the holes (h+) as the second active species. Based on the above results and in situ XPS, a possible electron transfer pathway was proposed.

Nanoengineering construction of g-C3N4/Bi2WO6 S-scheme heterojunctions for cooperative enhanced photocatalytic CO2 reduction and pollutant degradation

S-scheme heterojunction photocatalysts featuring efficient charge transport paths provide a promising strategy for cooperative achieving photocatalytic CO2 reduction reaction (CO2RR) and Rhodamine B (RhB) degradation. In this work, S-scheme heterojunctions composed of g-C3N4 nanosheets coated on Bi2WO6 nanosheets were prepared by a one-step hydrothermal method, resulting in broad-spectrum light absorption, high electron–hole separation efficiency, and excellent photocatalytic CO2 reduction and RhB oxidization performance. Mechanistic analysis revealed the formation of a directional charge transport path at the interface of the heterojunction, which maintained a high oxidation and reduction potential and improved the efficiency of photoexcited carrier separation. In particular, the synergistic reaction system showed excellent photoredox activity compared with the two separate half-reactions. The optimal catalyst 15CN/BWO displayed the highest CO2 conversion efficiency, with CO and CH4 generation rates of 4.3 and 2.7 μmol g−1h−1, respectively, and the degradation efficiency of the composite heterojunction was significantly higher than that of its constituent materials. This work provides a new possibility for designing a novel dual-function photocatalytic reaction system.

Retraction Note: Designing of CuS growing on Bi2WO6 nanosheet heterostructures based on a photoelectrochemical aptasensor for detecting ofloxacin.

Retraction Note: Designing of CuS growing on Bi2WO6 nanosheet heterostructures based on a photoelectrochemical aptasensor for detecting ofloxacin.

A two-dimensional Aurivillius oxide for enhanced solar energy driven hydrogen evolution and waste water treatment

Bi2WO6 has attracted extensive attention in photocatalysts in recent years as a typical Aurivillius oxide. However, it suffers from severe electron-hole recombination due to the large charge transfer distance from bulk to surface. Unfortunately, strong chemical bonds between the neighboring layers in Aurivillius oxides lead to difficulties in the construction of 2D materials. Here, a facile NaBH4-assisted hydrothermal method is developed to construct 2D Bi2WO6 nanosheets with adjustable thickness from 4.03 to 1.51 nm and O vacancies density (named as BWO-x, x = 15, 30, 45, 60). By balancing the thickness and the O vacancy density in the nanosheets, the charge separation efficiency can be tuned and consequently, the photocatalytic activity can be optimized, leading to over 11 times enhancement in photocatalytic hydrogen evolution. Furthermore, the best performed nanosheets demonstrate universality in dye polluted water treatment. Nearly 100% degradation can be reached after only 5, 50, and 30 min with degradation rate constant of 29.73, 3.21, and 6.62 min−1g−1 for Rhodamine B, methyl orange, and methylene blue, respectively. This work provides a comprehensive approach to produce ultrathin 2D nanosheets of Aurivillius photocatalysts for enhanced charge separation and photocatalytic activity.

Construction of dual vacancies and frustrated Lewis Pairs-modified Bi2WO6 nanosheets for efficient photocatalytic conversion of CO2 to CO

Surface vacancy engineering is an attractive modification strategy for constructing efficient photocatalysts. However, the monovacancy-modified photocatalysts exhibit limited activity in the CO2 reduction reaction (CO2RR), primarily due to their low efficiency in separating electron-hole pairs and weak CO2 binding affinity. Herein, a photocatalyst (In2O3-x(OH)y/Bi2WO6-VBi,O) was developed, consisting of Bi/O vacancies-rich Bi2WO6 (Bi2WO6-VBi,O) and In2O3-x(OH)y modified by surface frustrated Lewis pairs (SFLPs). Bi vacancies (VBi) and O vacancies (VO) are categorized as cationic and anionic vacancies, respectively. In comparison to monovacancy-modified photocatalysts, the above photocatalyst can bind the O and C atoms of CO2 to VBi and VO in a bidentate-bonding mode, as opposed to a monodentate-bonding mode, thus achieving robust adsorption and rapid activation of CO2 molecules. The findings from the molecular simulation suggest that dual vacancies and SFLPs enhance CO selectivity by accelerating the desorption step of the intermediate product *CO to CO. Moreover, the directional transfer of electrons from VO to VBi favors the separation of electron-hole pairs. The optimal sample (4.3 %In2O3-x(OH)y/Bi2WO6-VBi,O) has an excellent CO production rate of 191.8 μmol·gcat-1·h−1, 6.6 times that of Bi2WO6, and superior CO selectivity around 100 %. By manipulating dual vacancies and SFLPs, this research contributes to developing novel photocatalysts and elucidates the underlying mechanism of CO2 photoreduction.

Au-Cu dual-single-atom sites on Bi2WO6 with oxygen vacancy for CO2 photoreduction towards multicarbon products

CO2 photoreduction into high-value-added C2+ products struggles with energetic challenges in forming critical intermediates and multiple C−C bonds. Herein, an effectively synthesized photocatalyst, Bi2WO6 nanosheets with oxygen vacancies anchoring Au and Cu dual single atoms on the surface, can convert CO2 and H2O vapour into C3H6 and C2H4. The high product selectivity of 18.2 % for C3H6 and 65.4 % for total C2+ hydrocarbons are achieved under concentrated light irradiation (2.4 W·cm−2). Au-Cu dual-single-atom sites and defect engineering strategies exhibit synergistic effects on optimizing the reaction thermodynamics and charge kinetics for CO2 conversion. Theoretical calculations provide reference values for reaction pathways of C3H6 and C2H4 formation, with the C−C couplings being potential determining steps of multicarbon product formation. Our work offers a promising strategy with a combination of concentrated light irradiation technology and catalyst modification to achieve high selectivity of C2+ products.

Efficient piezo-assisted near-infrared-light-driven Cr(VI) reduction over Bi2S3 nanowires transformed from ultrathin Bi2WO6 nanosheets

Efficient piezo-assisted near-infrared-light-driven Cr(VI) reduction over Bi2S3 nanowires transformed from ultrathin Bi2WO6 nanosheets

Halogen-doped ultrathin Bi2WO6 for promoted separation of photogenerated carriers and efficient photocatalysis

Although photocatalysis is a viable and sustainable technique to remove refractory pollutants from wastewater, it is plagued by the low separation efficiency of photo-generated carriers. Herein, in situ surfactants (CTAC, CTAB, and DTAI) assisted synthesis of halogen-doped ultra-thin Bi2WO6 (BWO) nanosheets with oxygen vacancies, which efficiently degraded RhB and TC under visible light. Surfactant as a halogen source can also prevent the formation of BWO layered structures, thus making the sample thinner and thus reducing the transmission distance of photogenerated electrons. The degradation rates of rhodamine B (RhB) and tetracycline (TC) by BWO-Cl-90 and BWO-Br-90 upon visible light illumination are 5.8 times / 5.5 times and 2.5 times / 2.8 times by those of pure BWO, respectively. The free radical trapping experiments and ESR reveal that singlet oxygen (1O2) and photogenerated holes (h+) are the main active free radicals in the degradation of organic pollutants by BWO-Cl-90, while the superoxide radical (·O2-) and photogenerated holes (h+) play the main roles for BWO-Br-90. The photocatalytic mechanism is proposed. In addition, the EIS, photocurrent and photoluminescence (PL) experiments show that halogen doping improves the separation ability of photogenerated carriers. This study reveals a practical method to modify Bi2WO6-based materials for effective wastewater treatment and purification.

Designed synthesized step-scheme heterojunction of Bi2WO6 nanosheet supported on CuBi2O4 nanorod with remarkable photo-assisted gas sensing for N-butyl alcohol

Photo-assisted gas sensors for n-butyl alcohol detection have attracted considerable attention due to their great potential in safety production and human health. However, the sensitivity, selectivity and stability should be further improved for practical application. Herein, Bi2WO6 nanosheet supported on CuBi2O4 nanorod sensor was realized by the two-step hydrothermal method, and it exhibited excellent sensitivity and stability for n-butyl alcohol detection under blue LED light illumination at the operating work temperature of 110 °C with gas concentration from 0.5 to 800 ppm. Meanwhile, the gas concentration of n-butyl alcohol obtained from the sensor was comparable to that of GC analysis. Furthermore, the sensor showed lower responses to other 25 kinds of common organic gases including alcohols, aldehydes, benzenes and ketones compared with that of n-butyl alcohol. More attractively, the Bi2WO6/CuBi2O4 sensor maintained its stable photo-assisted sensing activity over 3 months. The excellent gas-sensing property was caused by light illumination and formation of Bi2WO6/CuBi2O4 heterojunction, leading to abundant active electrons and superoxide radicals. The S-scheme mode of charge transfer at the Bi2WO6/CuBi2O4 heterojunction was revealed by the in-situ XPS and in-situ ESR analyses. The results gained herein may be useful for rational design of S-scheme heterojunction in photo-assisted gas sensor for n-butyl alcohol analysis.

Synergistic photoactivity regulation of Bi2WO6 with highly exposed {0 0 1} facets and oxygen vacancies by base-metal-ion dopant for enhanced reduction of pharmaceutical compounds

Herein, base metal-doped Bi2WO6 nanosheets with a large proportion of exposed {001} facets and oxygen vacancies were prepared and exhibited greatly enhanced photoactivity for removing four kinds of pharmaceutical compounds under visible-light irradiation. Results in this study indicated that both Zn- and Cu-doped nanosheets possessed optimal photocatalytic activity due to their improved light-harvesting ability and transport efficiency of photo-induced carriers, but Cu-doped nanosheets showed better activity than Zn-doped samples attributed to the existence of high-oxidation-state Cu3+ ions. Meanwhile, it was found that the optimal photodegradation condition for the metal ion-doped photocatalysts was neutral pH, 10 mg/L of pollutants concentration and 0.3 g/L of catalyst dosage. The degradation rate of Zn-doped samples was different from Cu-doped ones, while the Zn-doped samples showed almost 100 % degradation rate for hydrocortisone and 87.8 % for atenolol but the Cu-doped ones showed 100 % for hydrocortisone, 99.3 % for bezafibrate, and 82.1 % for carbamazepine. It was found that O2− and 1O2 were the dominant active species for photodegradation and the breakdown products were identified to be hypotoxic generally.

Surface plasmon resonance-enhanced photoelectrochemical immunoassay with Cu-doped porous Bi2WO6 nanosheets

The development of rapid screening sensing platforms to improve pre-screening mechanisms in community healthcare is necessary to meet the significant need for portable testing in biomarker diagnostics. Here, we designed a portable smartphone-based photoelectrochemical (PEC) immunoassay for carcinoembryonic antigen (CEA) detection using Cu-doped ultrathin porous Bi2WO6 (CuBWO) nanosheets as the photoactive material. The CuBWO nanosheets exhibit a fast photocurrent response and excellent electrical transmission rate under UV light due to their surface plasmon resonance effect (SPR). The method uses glucose oxidase-labeled secondary antibody as a signal indicator for sandwich-type immune conjugation. In the presence of the target CEA, the electrons and holes generated at the surface of the photo-excited ultrathin porous CuBWO were rapidly consumed by the production of H2O2 from glucose oxidase oxidizing glucose, resulting in a weakened photocurrent signal. The photocurrent intensity increased logarithmically and linearly with increasing CEA concentration (0.02–50 ng mL−1), with a detection limit of 15.0 pg mL−1 (S/N = 3). The system provides a broader idea for inferring the electron-hole transport mechanism in ultrathin porous nanosheet layer materials and developing efficient PEC sensors.

LDH/MXene Synergistic Carrier Separation Effects to Improve the Photoelectric Catalytic Activities of Bi2WO6 Nanosheet Arrays.

Photoelectric catalysis is a green and efficient way to degrade pollutants, which has been paid more and more attention by researchers. Among them, Bi2WO3 has been proved to have excellent photocatalytic oxidation activity on its {001} facets. In this study, {001}-oriented facets with high exposure were successfully integrated into Bi2WO6 nanoplate arrays (Bi2WO6 NAs) to create a photoelectrode. This structure was grown in situ on an indium tin oxide (ITO) substrate. To promote photogenerated carrier separation efficiency and reduce agglomeration of Bi2WO6 photocatalysts, the electrochemical deposition of NiFe-layered double hydroxide (NiFe-LDH) and Ti3C2 (MXene) were introduced in this research to synergistically catalyze pollutant degradation. Morphology, spectral characterization, and electrochemical analysis jointly confirmed that the outstanding performance of hole capture behavior with LDH and electron conduction properties with MXene were the main reasons for the improvement in catalytic activity of the photoelectrode. Taking bisphenol A (BPA) as the model pollutant, the rate constant k of the NiFe-LDH/Ti3C2/Bi2WO6 NAs photoelectrode reaches 0.00196 min-1 under photoelectrocatalytic (PEC) conditions, which is 4.5 times that of the pure Bi2WO6 NAs photoelectrode. This work provides a new way to improve the reaction kinetics of the PEC degradation of pollutants.

Novel Ag-Bridged Z-Scheme CdS/Ag/Bi2WO6 Heterojunction: Excellent Photocatalytic Performance and Insight into the Underlying Mechanism

The construction of semiconductor heterojunction photocatalysts that improve the separation and transfer of photoinduced charge carriers is an effective and widely employed strategy to boost photocatalytic performance. Herein, we have successfully constructed a CdS/Ag/Bi2WO6 Z-scheme heterojunction with an Ag-bridge as an effective charge transfer channel by a facile process. The heterostructure consists of both CdS and Ag nanoparticles anchored on the surface of Bi2WO6 nanosheets. The photocatalytic efficiency of the CdS/Ag/Bi2WO6 system was studied by the decontamination of tetracycline (TC) and Rhodamine B (RhB) under visible light irradiation (λ ≥ 420). The results exhibited that CdS/Ag/Bi2WO6 shows markedly higher photocatalytic performance than that of CdS, Bi2WO6, Ag/Bi2WO6, and CdS/Bi2WO6. The trapping experiment results verified that the •O2− and h+ radicals are the key active species. The results of photoluminescence spectral analysis and photocurrent responses indicated that the CdS/Ag/Bi2WO6 heterojunctions exhibit exceptional efficiency in separating and transferring photoinduced electron−hole pairs. Based on a series of characterization results, the boosted photocatalytic activity of the CdS/Ag/Bi2WO6 system is mostly due to the successful formation of the Ag-bridged Z-scheme heterojunction; these can not only inhibit the recombination rate of photoinduced charge carriers but also possess a splendid redox capacity. The work provides a way for designing a Z-scheme photocatalytic system based on Ag-bridged for boosting photocatalytic performance.

Directional growth of Bi2WO6 with highly exposed facets on 2D‐Co3O4 for different properties under two light sources

AbstractA composite of two or more materials usually results in enhanced specific properties. In this paper, a kind of composite material composed of Bi2WO6 with highly exposed {010} facets and 2D‐Co3O4 was prepared by a one‐pot reaction and then applied to decontaminate hydrocortisone in wastewater. The Bi2WO6/Co3O4 composite possessed a rose‐like surface microtopography self‐assembled from Bi2WO6 and Co3O4 nanosheets. The micro‐interface analysis showed that {110} facets of Co3O4 and {010} facets of Bi2WO6 were glued in situ and formed heterojunction. Additionally, the removal ability of hydrocortisone through Bi2WO6/Co3O4 varied under different light sources, which was 85.0 % under ultraviolet light and 97.3 % under visible light within 60 min. It was considered that Bi2WO6/Co3O4 was similar to a traditional heterojunction and the major reactive species was H2O2 under ultraviolet light, while it played a role as a Z‐scheme photocatalyst and the major reactive species was ⋅OH under visible light. Finally, product analysis of hydrocortisone demonstrated that the dexter chain broke whatever under ultraviolet or visible light, but the breakage of parent nucleus appeared only under visible light. This research revealed the enhanced catalytic properties of p‐n heterojunction catalysts and indicated the specifically exposed facets are promising for organic contaminants in water.