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Synergetic utilization of photoabsorption and surface facet in crystalline/amorphous contacted BiOCl-Bi2S3 composite for photocatalytic degradation
摘要： Photoabsorption and surface property of semiconductor are two key factors to determine its photocatalytic performance. In this work, BiOCl-Bi2S3 composites composed of Bi2S3 nanoparticles bonded on BiOCl nanoplates enclosed with {001} and {110} crystal facets were synthesized through an in-situ ion exchange method at room temperature. The transformed Bi2S3 made BiOCl-Bi2S3 composites efficient visible light absorption, ensuring the quantity of photoinduced carriers as well as intimate crystalline-amorphous contact interface to benefit the separation of photoinduced carriers. Moreover, BiOCl nanoplates enclosed with {001} and {110} crystal facets can convenient transfer carriers to {001} crystal facets. The photocatalytic performance of BiOCl-Bi2S3 composites was evaluated by the methylene blue photodegradation under visible light irradiation and the results indicate that BiOCl-Bi2S3 composites have good photocatalytic ability due to enhanced light absorption, efficient separation and transfer of carriers. Based on the active species trapping experiments, transient photocurrents, electrochemical impedance spectroscopy and energy band structure, a possible photocatalytic mechanism of methylene blue over the BiOCl-Bi2S3 composites was proposed.
关键词： Surface property,Visible light,BiOCl-Bi2S3,Contact interface,Photocatalytic mechanism,Crystal facet
更新于2025-09-23 15:22:29
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Constituent substitution in hot wall deposition of Bi2S3 films by reaction with substrates
摘要： Replacement of a constituent in the overgrown layers with the materials provided by the substrates is investigated when Bi2S3 films are deposited on III-V compound semiconductors and transition metals using a hot wall epitaxy method. The substitution caused by the S atoms is stronger than that by the Se and Te atoms in deposition of Bi2Se3 and Bi2Te3 films. Mere exposure to Bi2S3 vapor of In-containing compounds (InP and InAs) and Ga-containing compounds (GaAs and GaSb) at epitaxial growth temperatures results in a capping of their surfaces by In2S3 and GaS, respectively. A temperature window is revealed to exist for the GaAs case where growth of Bi2S3 microcrystals occurs within the temperature range for the sulfide formation. The sulfurization by the material substitution is thus demonstrated to be not always identical with that using elemental sulphur. We examine furthermore the sulfides synthesized on the surfaces of Cu, Ag, Ni, Mo, and W. The sulfides produced on Cu and Ag undergo material alterations when they are irradiated by a laser light.
关键词： X-ray crystallography,Hot wall epitaxy,Material substitution,Raman spectroscopy,Bi2S3,Sulfides
更新于2025-09-23 15:22:29
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Urchin-like TiO2 structures decorated with lanthanide-doped Bi2S3 quantum dots to boost hydrogen photogeneration performance
摘要： The formation of heterojunctions between wide- and narrow-bandgap photocatalysts is commonly employed to boost the efficiency of photocatalytic hydrogen generation. Herein, the photoactivity of urchin-like rutile particles is increased by decorating with pristine as well as Er- or Yb-doped Bi2S3 quantum dots (QDs) at varied QD loadings (1–20 wt%) and doping degrees (1–15 mol%), and the best hydrogen evolution performance is achieved at Er and Yb contents of 10 mol%. Specifically, a hydrogen productivity of 1576.7 μmol?gcat?1 is achieved after 20-h irradiation for TiO2 decorated by 10 mol% Yb-doped Bi2S3 QDs. Theoretical calculations show that the introduction of defects into the Bi2S3 lattice through Er/Yb doping promotes the creation of the levels and facilitates transport of photogenerated charges during the photocatalytic process.
关键词： quantum dots,photocatalysis,TiO2,lanthanide doping,Bi2S3,hydrogen generation
更新于2025-09-23 15:21:01
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Defects Type Dependent Near-Infrared-Driven Photocatalytic Bacterial Inactivation by Defective Bi2S3 nanorods
摘要： Defects engineering is crucial in tailoring the photocatalytic efficiency, but it suffers from uncertainty to determine the vacancy type, and it is confusing which type of the vacancy can better promote the photocatalytic efficiency. In this study, Bi2S3 nanorods with bismuth or sulfur vacancies were synthesized respectively to investigate their distinct effects on the electronic structure, electron-hole separation characteristics and near-infrared (NIR)-driven photocatalytic bacterial inactivation activity. Both bismuth and sulfur vacancies can enhance the light absorption ability of Bi2S3. However, the life span of photoinduced electrons is extended by bismuth vacancy but shortened by sulfur vacancy. Due to these advantages, the bismuth vacant Bi2S3 can fully inactivated 7 log E. coli cells within 40 min of NIR irradiation, displaying a better NIR-driven photocatalytic bacterial inactivation efficiency than that of Bi2S3 with sulfur vacancy. This study disclosed the defects type dependent photocatalytic behaviors, providing new insights into designing highly efficient photocatalyst.
关键词： defect type dependent efficiency,near-infrared-driven photocatalysts,defective Bi2S3 nanorods
更新于2025-09-23 15:21:01
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Highly efficient photoelectrochemical water oxidation enabled by enhanced interfacial interaction in 2D/1D In2S3@Bi2S3 heterostructures
摘要： Van der Waals (vdW) heterostructures have received tremendous attention in low dimensional semiconductors due to interfacial surface reconstruction and electronic coupling effects. Here, we report mixed-dimensional 2D/1D In2S3@Bi2S3 heterostructures synthesized via two-step solvothermal in-situ growth. Theoretical calculations demonstrate In2S3 nanosheets and Bi2S3 nanorods are integrated together through the vdW interaction. Through theoretical calculations and experiment, the results confirm the surface potential of Bi2S3 is higher than In2S3, implying the free electrons will flow from Bi2S3 to In2S3 when the two semiconductors contact, leading to electron’s and hole’s accumulation at In2S3 and Bi2S3 surface. This redistribution of charges will induce an outward vector of built-in electric field at the In2S3@Bi2S3 interface (from Bi2S3 to In2S3), thereby improving hole’s transfer to In2S3 and electron’s transfer to Bi2S3. The advanced heterostructure aids in shortening the photogenerated electrons’ transport time (14 μs), promoting the electron-hole’s separation, and presents 13.3-fold enhancement in photocurrent density when compared to In2S3.
关键词： water oxidation,photoelectrochemical,interface interaction,In2S3@Bi2S3,heterostructure
更新于2025-09-23 15:19:57
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<i>In situ</i> synthesis of n–n Bi <sub/>2</sub> MoO <sub/>6</sub> & Bi <sub/>2</sub> S <sub/>3</sub> heterojunctions for highly efficient photocatalytic removal of Cr( <scp>vi</scp> )
摘要： Exploiting novel photocatalysts with high efficiency and durability for reduction of hexavalent chromium (Cr(VI)) has gained attention from fundamental science and industrial research. In this work, we synthesized novel two-dimensional (2D) n–n Bi2MoO6 & Bi2S3 heterojunctions by a facile in situ anion exchange process for remarkably efficient removal of Cr(VI). Results show that Bi2MoO6 & Bi2S3 heterojunctions with core–shell structures are formed through the intimate contact of Bi2MoO6 core and Bi2S3 shell. The prepared Bi2MoO6 & Bi2S3 heterojunctions exhibit unprecedented photocatalytic activity for reduction of Cr(VI) under visible light irradiation. The optimized BMO-S1 heterojunction displays the highest reduction efficiency (kapp = 0.164 min?1) for Cr(VI) reduction. To the best of our knowledge, it is one of the highest reduction rate achieved among reported photocatalysts for Cr(VI) reduction under visible-light irradiation. Detailed studies show that strong selective adsorption for Cr(VI) enhances this unprecedented photocatalytic activity. Moreover, the intimate heterojunction between Bi2MoO6 core and Bi2S3 shell can efficiently deteriorate the charge carrier recombination and Bi2S3 content can boost visible light harvesting, thereby contributing to the remarkable photocatalytic catalytic activity, which were proven by PL, EIS and transient photocurrent responses. Characterization of Mott–Schottky plots and DRS prove that the Bi2MoO6 & Bi2S3 heterojunctions established a type-II band alignment with intimate contact, accounting for the efficient transfer and separation of photogenerated carriers. This work provides a simple route for facial synthesis of heterojunction photocatalysts for Cr(VI) reduction in industrial applications.
关键词： photocatalytic,visible light,Cr(VI) reduction,heterojunctions,Bi2S3,core-shell structure,Bi2MoO6
更新于2025-09-19 17:15:36
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Flower-like Fe7S8/Bi2S3 Superstructures with Improved Near-Infrared Absorption for Efficient Chemo-Photothermal Therapy
摘要： Although various photothermal therapy (PTT) nanoagents have been developed in recent years, the rational design and easy synthesis of a PTT nanoplatform with improved near-infrared (NIR) absorption remains challenging. Herein, via a facile one-pot solvothermal strategy, hydrophilic nanosheet-assembled flower-like Fe7S8/Bi2S3 superstructures were fabricated successfully. Such nanoflowers exhibit improved NIR absorption, which is 1.54 times higher than that of pure Bi2S3 nanosheets at a wavelength of 808 nm. Attractively, these nanoflowers could be served as a drug delivery carrier with controlled release under pH/NIR stimuli, and display fascinating chemo-photothermal synergetic therapeutic effect both in vitro and in vivo. The resulting nanoflowers may open up a way for the design of other nanoagents with improved NIR absorption as well as chemo-photothermal cancer therapy effect.
关键词： Fe7S8/Bi2S3,chemotherapy,nanoflowers,photothermal therapy,near-infrared absorption,drug delivery
更新于2025-09-19 17:15:36
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Fabrication of vessel–like biochar–based heterojunction photocatalyst Bi2S3/BiOBr/BC for diclofenac removal under visible LED light irradiation: Mechanistic investigation and intermediates analysis
摘要： In this work, a novel, economical and effective vessel–like biochar–based photocatalyst Bi2S3/BiOBr/BC was synthesized by a facile one–pot solvothermal method for the first time. A series of characterization analyses demonstrated the successful preparation of photocatalyst Bi2S3/BiOBr/BC. Furthermore, diclofenac (DCF) as the target contaminant was applied to elucidate the enhanced photocatalytic performance (93.65%, 40 min) under energy–saving visible LED light irradiation. Comparison experiments among different photocatalysts and photoelectrochemical tests results illustrated that excellent photocatalytic performance of Bi2S3/BiOBr/BC 10% might be attributed to the electrons transfer of biochar and higher charge separation efficiency of heterojunction structure. Besides, lower electrical energy per order value indicated photocatalyst/visible LED light system was more energy–saving. Proper photocatalyst dosage (0.6 g/L) and relatively acidic water environment (pH=5.0) would be beneficial to DCF photodegrdation by Bi2S3/BiOBr/BC. Good reusability and stability of Bi2S3/BiOBr/BC were verified via five consecutive recycle experiments. Furthermore, the role of active species was determined through trapping experiments and ·O2– and h+ dominated the photodegradation reaction to mineralize DCF molecules. Eleven main intermediates and four possible photodegradation pathways were proposed by HRMS analysis. Accordingly, photocatalyst Bi2S3/BiOBr/BC would provide potential technical support for emerging pollutant removal in water matrix.
关键词： Diclofenac,Photocatalytic mechanism,Bi2S3/BiOBr/BC,Visible LED light,Degradation pathway
更新于2025-09-19 17:13:59
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Rod-based urchin-like hollow microspheres of Bi2S3: Facile synthesis, photo-controlled drug release for photoacoustic imaging and chemo-photothermal therapy of tumor ablation
摘要： Hollow nanostructures have been evoked considerable attention owing to their intriguing hollow interior for important and potential applications in drug delivery, lithium battery, catalysis and etc. Herein, Bi2S3 hollow microspheres with rod-based urchin-like nanostructures (denoted as U-BSHM) were synthesized through a facile and rapid ion exchanging method using a particular hard template. The growth mechanism of the U-BSHM has been investigated and illustrated by the morphological evolution of the different samples at early stages. The obtained U-BSHM exhibited strong and wide UV-vis-NIR absorption ability and outstanding photothermal conversion efficiency. Thus, the U-BSHM can be used as spatio-temporal precisely controlled carrier by loading the mixture of 1-tetradecanol (phase change material, PCM) with melting point around 38 oC and hydrophilic chemotherapeutic doxorubicin hydrochloride (denoted as DOX) into the hollow interior to form (PCM+DOX)@Bi2S3 nanocomposites (denoted as PD@BS) for photoacoustic (PA) imaging and chemo-photothermal therapy of the tumors. When exposed to 808 nm near infrared light (NIR) laser irradiation, this nanocomposites could elevate the temperature of the surroundings by absorption and conversion of the NIR photons into heat energy, which inducing the triggered release of DOX from the hollow interior once the temperature reach up to the melting point of PCM. The killing efficiency of the chemo-photothermal therapy was systematically validated both in vitro and in vivo. In the meanwhile, the implanted tumor was completely restrained through PA imaging and combined therapies. Therefore, this kind of urchin-like hollow nanostructures would be used as important candidates for the multimodal bioimaging and therapy of tumors.
关键词： chemo-photothermal therapy,sacrificed template method,photo-controlled drug release,photoacoustic imaging,Bi2S3
更新于2025-09-19 17:13:59
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Selective synthesis of Bi2S3/BiOCl composites as electrode for high performance photodetector
摘要： Bi2S3/BiOCl composites were synthesized through a facile polyol refluxing process. The as-synthesized products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), UV-vis diffuse reflectance spectrometer (UV-vis DRS). Herein, a junction was constructed by simply depositing a new Bi2S3/BiOCl nanocomposite film on FTO (Fluorine Doped Tin Oxide) substrate. The new Bi2S3/BiOCl-based photodetector exhibit high sensitivity, high on/off ratio of 330 times, fast rise time of 0.07 s and decay time of 0.07 s, which is the first report among all reported Bi2S3/BiOCl composites-based optoelectronic devices. Our results imply that the new type of photodetector based on Bi2S3/BiOCl composites has great potential in next generation high-performance optoelectronic devices. According to the sensing mechanism discussed, the good optoelectronic performance may be attributed to the Bi2S3/BiOCl composites as well as the schottky junction between FTO electrodes and Bi2S3/BiOCl products.
关键词： photodetector,polyol refluxing process,optoelectronic devices,Bi2S3/BiOCl composites
更新于2025-09-19 17:13:59