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Self-assembled BiOCl/Ti3C2T composites with efficient photo-induced charge separation activity for photocatalytic degradation of p-nitrophenol
摘要： Cocatalysts play an important role in increasing the photogenerated electron-hole separation rate of catalytic materials. Here, we selected a novel 2D material Ti3C2Tx (Tx = –OH, –O) as a cocatalyst and synthesized BiOCl/Ti3C2Tx (named as BT-n n = 0, 0.5, 1.0, 2.0, 4.0) composite materials by electrostatic self-assembly. We carefully characterized the structure, morphology and photoelectric performance of the composites, finding that we successfully synthesized 2D/2D BiOCl/Ti3C2Tx materials. The photocatalytic performance of the composites was evaluated by degradation of p-nitrophenol as a pollutant under simulated illumination. Among the composites obtained, BT-2.0 showed the best photocatalytic performance; specifically, its removal rate reached 97.86% and its degradation rate was about 3.3 times that of BT-0. Free radicals in the photocatalytic process were tested by electron paramagnetic resonance, which showed that superoxide radicals and holes are the most active free radicals in the system due to the higher photogenerated electron separation efficiency of BT-2.0. Therefore, constructing a heterojunction with Ti3C2Tx as a cocatalyst can improve the photocatalytic activity of BiOCl, which may provide new insights into the selection of novel co-catalytic materials in the field of photocatalysis.
关键词： p-nitrophenol,photocatalytic degradation,MXene,superoxide radicals,BiOCl
更新于2025-09-23 15:21:01
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BiOCl Nanoplates Decorated on g-C3N4 for Enhanced Photocatalytic Activities
摘要： A facile solvothermal method has been successfully developed for the preparation of BiOCl/g-C3N4 nanocomposite using sodium dodecyl benzene sulfonate as the surfactant. The results revealed that BiOCl nanoplates with thickness below 5 nm and widths of 20~30 nm were uniformly dispersed on the surface of g-C3N4 nanosheets, indicating the formation of a close contact between the BiOCl and g- C3N4. The catalytic activity of the obtained BiOCl/g-C3N4 composite has been evaluated by the degradation process of rhodamine B under visible light irradiation. It has been demonstrated that the catalytic activity of BiOCl/g-C3N4 composite was significantly enhanced compared with the bare component due to the synergistic effect between BiOCl and g-C3N4.
关键词： BiOCl,Nanocomposite,Surfaces,Photocatalyst,g-C3N4
更新于2025-09-23 15:21:01
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Enhancing the performance of pollution degradation through secondary self-assembled composite supramolecular heterojunction photocatalyst BiOCl/PDI under visible light irradiation
摘要： A novel n-n type inorganic/organic heterojunction of flaky-like BiOCl/PDI photocatalyst was constructed by water bath heating method. Meanwhile, a simple method - secondary self-assembly was used to prepare the BiOCl/PDI with a special band structure. The photocatalytic activities were evaluated by degrading aqueous organic pollutants under visible light (λ > 420 nm). The removal rates of 5 mg L?1 phenol (non-ionic type), methyl orange (MO, anionic type), rhodamine B (RhB, cationic type) and 10 mg L?1 RhB by secondary self-assembly BiOCl/PDI (BiOCl/PDI-2) were 8.0%, 3.4%, 27.8% and 78.9% higher than self-assembly BiOCl/PDI (BiOCl/PDI-1) under visible light (λ > 420 nm). The better photocatalytic activity for BiOCl/PDI-2 was attributed to the optimization of energy-band structures, which arose from different exposed surfaces, narrower interplanar spacing and stronger visible light absorption performance. Under acidic condition, BiOCl/PDI-2 showed a good photocatalytic activity, which was not affected by neutral ionic intensity and had good recycling properties. Moreover, the photocatalytic mechanism was explored by free radical capture test and electron paramagnetic resonance (EPR), and contribution of active species was calculated. The main active species of BiOCl/PDI-2 were ?O2?, 1O2 and h+. Our work may provide a route to design efficient inorganic/organic heterojunctions for organic pollutants degradation.
关键词： Supramolecular,Visible light photocatalysts,Perylene diimide,BiOCl,Heterojunction
更新于2025-09-23 15:19:57
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One dimensional hierarchical BiOCl microrods: their synthesis and their photocatalytic performance
摘要： In this work, one dimensional hierarchical BiOCl microrods were controllably synthesized via a hydrothermal method using sodium citrate as the structure-directing agent. Each hierarchical BiOCl structure is made up of many BiOCl nanosheets in which the size and thickness are controlled by the concentration of sodium citrate. The high-resolution transmission electron microscopy (HRTEM) measurements show that each nanosheet consists of the BiOCl hierarchical structure with exposed (001) (top surface) and (110) (side surface) facets. With the amount of sodium citrate increasing, the ratio (110)/(001) gradually increases. These hierarchical BiOCl architectures exhibit a more outstanding photocatalytic activity than BiOCl nanosheets with exposed (001) facets, and rhodamine B (RhB) and methyl orange (MO) can be degraded in 3 and 4 min, respectively. This enhanced photocatalytic performance is ascribed to the fast separation and transfer of photogenerated electron–hole pairs, the formation of hierarchical architectures and the large BET surface areas. Radical scavenger experiments indicate that holes (h+) and superoxide radicals (˙O2?) are the main active species for MO degradation during the photocatalytic process.
关键词： BiOCl,hydrothermal synthesis,photocatalytic activity,hierarchical structure,sodium citrate
更新于2025-09-19 17:15:36
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Oxygen vacancy-assistant enhancement of photoluminescence performance of Eu3+ and La3+-codoped BiOCl ultrathin nanosheets
摘要： The Eu3+ and La3+ co-doped BiOCl ultrathin nanosheets were prepared through a facile solvothermal method. The samples were characterized using different techniques to study the structure, morphology, and luminescence. The solvothermal derived samples exhibit the morphology of ultrathin nanosheet. The photoluminescence spectrum of the Eu3+ ions doped BiOCl sample shows a broad emission band in the wavelength range of 380–480 nm due to the oxygen vacancies present in the sample. The spectrum also shows sharp characteristic emission peaks of Eu3+ ions. The intensity of this broad emission band increases with the incorporation of La3+ ions, due to the increase in oxygen vacancies. These results were demonstrated by the XPS spectra for all the samples. It was found that the overall luminescence intensity for the BiOCl: Eu3+, La3+ ultrathin nanosheet was about 300% stronger than the BiOCl: Eu3+ ultrathin nanosheet. As the La3+ ions concentration increases the CIE values shift from bluish-white region to white.
关键词： Oxygen vacancy,Solvothermal,Photoluminescence,BiOCl,Ultrathin nanosheet
更新于2025-09-19 17:15:36
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One-step <i>in situ</i> synthesis of BiOCl/(BiO) <sub/>2</sub> CO <sub/>3</sub> composite photocatalysts with exposed high-energy {001} facets
摘要： Tailoring the chemical composition and morphology of a composite photocatalyst is a key way to achieve superior photocatalytic activity. In this work, a simple method has been developed to controllably prepare BiOCl/(BiO)2CO3 composite photocatalysts with exposed {001} facets. The chemical composition and morphology of the BiOCl/(BiO)2CO3 composites can be easily tuned by simply changing the ethanol/water volume ratio in the initial reaction system. The precursor of guanidine hydrochloride not only acts as the source of chloride and carbonate ions to form the BiOCl/(BiO)2CO3 composites, but also acts as the crystal growth inhibitor to control the growth of BiOCl nanosheets. The composites exhibit superior photocatalytic activity towards the degradation of rhodamine B under visible light irradiation, which can be ascribed to the type-II band alignment and intimate interfacial contacts between BiOCl nanosheets and (BiO)2CO3 nanoparticles, as well as their exposed high-energy facets. Both the formation mechanism of the BiOCl/(BiO)2CO3 composite and the photocatalytic degradation mechanism have been investigated and proposed.
关键词： BiOCl/(BiO)2CO3 composite,solvothermal synthesis,exposed {001} facets,photocatalytic degradation,photocatalyst
更新于2025-09-19 17:15:36
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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
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Study of the photocatalytic performance and carrier migration of reduced graphene oxide-modified infrared-responsive photocatalyst β-NaYF4:Yb3+, Er3+@BiOCl-rGO
摘要： To further enhance the photocatalytic performance of BiOCl, a facile hydrothermal reduction reaction was used to synthesize the reduced graphene oxide- (rGO-) modified ternary compound photocatalyst β-NaYF4:Yb3+, Er3+@BiOCl-rGO (NYF–Bi-rGO). rGO prepared using a hydrothermal method showed good conductivity. Furthermore, the specific surface area of NYF-Bi-rGO was 20-fold larger than that of NYF, which is a quality that could prove highly advantageous for use in pollutant adsorption. In addition, the ternary photocatalytic system produced by rGO increased the absorption intensity of NYF-Bi in the visible light region, and caused a red-shift of the entire absorption cross-section. In particular, analysis of carrier migration showed the introduction of rGO promoted the separation of the photoelectron-hole pairs of BiOCl, inhibited its recombination and improved the photocatalytic efficiency of the ternary photocatalyst NYF-Bi-rGO.
关键词： Photocatalytic degradation,Characterization,BiOCl nanosheets,Reduced graphene oxide (rGO)
更新于2025-09-16 10:30:52
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Enhanced Photocatalytic Degradation of Levofloxacin by Fe-doped BiOCl nanosheets under LED light irradiation
摘要： In this research, Fe-doped BiOCl nanosheets were successfully synthesized through controlled hydrothermal method and applied in the degradation of levofloxacin (LVX) by sulfate radical-based photo-Fenton process. The conduction band of Fe-doped BiOCl was calculated as 2.77 eV compared to BiOCl (3.24 eV), and showed remarkable visible-LED-light driven photocatalytic activity with the expanded visible light absorption. Certain parameters were studied, with the addition persulfate (1 mM) and catalyst dosage (0.5 g L-1) at natural pH, the LVX reached over 95% degradation efficiency in 60 min during at least five successive experiments which displayed excellent catalytic activity and stability. LVX degradation was confirmed to depend on the formation of free reactive oxidant species through radical scavenger reagents and EPR analysis. On the basis of the experimental results and density functional theory calculations, the role of photocatalytic degradation mechanism of LVX degradation by the Fe-BiOCl sample was investigated. Moreover, the LVX degradation pathway was induced according to the intermediates detected by LC-MS. The results of this research demonstrated the good feasibility of Fe-doped BiOCl nanosheets which would enhance the utilization of photocatalysts under visible light irradiation.
关键词： LED light,Fe-BiOCl,levofloxacin (LVX),photocatalytic degradation
更新于2025-09-16 10:30:52
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Synthesis of BiOCl: Eu3+ Microarchitectures and their WLED’s, Fingerprint Detection and Anticounterfeiting Applications
摘要： BiOCl: Eu3+(1-9mol %) microarchitectures were synthesized by the solution combustion method by employing Barbituric acid as fuel. The crystal structure, morphologies and luminescence properties of Eu3+ doped BiOCl have been systematically investigated by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM) and spectroscopy respectively. The prime objective of the current effort was first to fabricate highly luminescent nanophosphor for revelation of latent fingerprints, lips prints including infiltrating and non-filtrating surfaces and also to develop luminescent ink for anticounterfeiting applications. Presently the fingerprints developed by using conventional powders have several disadvantages including low sensitivity, high background hindrance, complicated procedure and high toxicity. To encounter this challenge, we explored the optimized BiOCl:Eu3+(3mol %) nanophosphor for detection of latent fingerprints and luminescent anti-counterfeiting ink. The morphology of the phosphor was tuned by adjusting the concentration of fuel. Photoluminescence studies of BiOCl:Eu3+(1-9mol %) exhibited the peaks 5D0 → 7FJ (J = 0, 1, 2, 3, 4) transitions. The CIE and CCT characteristics specify that the synthesized nanophosphor might be immensely show potential red factor for promising applications in WLED’s. The BiOCl: Eu3+ (1-9 mol %) nanopowder also showed clear ridge patterns of level I and level II and further showed sharp image of label when observed in the UV light. The results indicated that the present phosphor could be used in both forensic as well as in anti counterfeiting applications.
关键词： Barbituric acid,BiOCl,morphology,luminescence,photoluminescence,nanophosphor,Eu3+
更新于2025-09-12 10:27:22