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Integration of Metallic TaS <sub/>2</sub> Co-catalyst on Carbon Nitride Photoharvester for Enhanced Photocatalytic Performance
摘要： The efficient separation of photogenerated electron-hole (e--h+) pairs is the key point for photocatalytic reactions. The integration of co-catalysts, especially noble-metals, can improve the e--h+ separation efficiency dramatically. However, the high-cost would limit their large-scale application. Therefore, the exploration of noble-metal-free co-catalysts is still important for the development of photocatalysis. In this work, we report a series of metallic TaS2 based catalysts that can effectively boost the photocatalytic performance of a metal-free semiconductor (2D-C3N4). The advantages of the as-prepared catalysts were demonstrated as follows: (i) noble-metal-free; (ii) outstanding electrical conductivity; and (iii) superior stability. As demonstrated in photocatalytic degradation reaction, the optimal removal rate of pollutant Rhodamine B (RhB) reached to 92 % after 100 min of irradiation, which is enhanced by almost 25 % more than pure two-dimensional graphitic carbon nitride nanosheets (2D-C3N4). This work may provide insight into finding new low-cost metallic materials as co-catalyst to promote phototcatalytic performance. This article is protected by copyright. All rights reserved
关键词： TaS2,2D-C3N4,photocatalysis,co-catalyst
更新于2025-09-04 15:30:14
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A specifically-exposed cobalt oxide/carbon nitride 2D heterostructure for carbon dioxide photoreduction
摘要： Photocatalytic reduction of CO2 provides an opportunity to reach carbon neutrality, by which CO2 emissions from fuel consumption can be converted back to fuels. The challenge is to explore materials with high charge separation efficiency and effective CO2 adsorption capacity to boost the photoreduction of CO2. Here we report that 2D heterostructure comprised of Co3O4/2D g-C3N4 (COCN) can provide enhanced photocatalytic performance of reducing CO2 to CO, yielding a CO production rate of 419 μmol g-1 h-1 with selectivity of 89.4%, which is 13.5 and 2.6 times higher than that of pure 2D g-C3N4 and Co3O4. The enhanced photocatalytic performance arises from: (i) enhanced light absorption ability and charge separation efficiency originated from the unique 2D heterostructure connected through specifically-exposed facet interface and (ii) favorable CO2 adsorption capacity. The study may provide insight for the establishment of heterostructure-based photocatalytic system toward CO2 reduction.
关键词： g-C3N4,Co3O4,Composite photocatalysts,CO2 conversion
更新于2025-09-04 15:30:14
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Fabrication of large surface area nitrogen vacancy modified graphitic carbon nitride with improved visible-light photocatalytic performance
摘要： In this work, nitrogen vacancy modified graphitic carbon nitride (g-C3N4) with large surface area was synthesized and analyzed by a series of instruments, including XRD, FTIR, XPS, EPR SEM, TEM, DRS and PL, etc. and the photocatalytic H2-evolution activity was investigated. The results indicated that the as-synthesized g-C3N4 with nitrogen vacancy exhibited stronger visible light response capability, enlarged specific surface area and notably separated rate of photoinduced charge carriers, which caused the as-synthesized photocatalyst possessing the higher hydrogen evolution rate (5250 μmol h?1 g?1) and excellent recycle stability. Evidently, this work could provide a new insight for preparing highly efficient photocatalyst.
关键词： Large surface area,Nitrogen vacancy,Photocatalysis,g-C3N4,Photocatalytic performance
更新于2025-09-04 15:30:14
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Surface defect and rational design of TiO2?x nanobelts/ g-C3N4 nanosheets/ CdS quantum dots?hierarchical structure for enhanced visible-light-driven photocatalysis
摘要： TiO2-x/g-C3N4/CdS ternary heterojunctions are fabricated through thermal polymerization-chemical bath deposition combined with in-situ solid-state chemical reduction approach. The prepared materials are characterized by X-ray diffraction, Fourier transform infrared spectra, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption, and X-ray photoelectron spectroscopy. The results show that the ternary heterojunctions are formed successfully and CdS quantum dots (QDs) and TiO2 are anchored on surface of g-C3N4 nanosheets simultaneously. The visible-light-driven photocatalytic degradation ratio of Bisphenol A and hydrogen production rate are up to 95% and ~254.8 mmol h-1, respectively, which are several times higher than that of pristine TiO2. The excellent visible-light-driven photocatalytic activity can be ascribed to the synergistic effect of TiO2-x, g-C3N4 and CdS QDs which extend the photoresponse to visible light region and favor the spatial separation of photogenerated charge carriers.
关键词： Photocatalysis,Ti3+ self-doping,g-C3N4 nanosheets,CdS quantum dots,TiO2 nanobelts
更新于2025-09-04 15:30:14
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Facile Synthesis of Visible Light-Induced g-C3N4/Rectorite Composite for Efficient Photodegradation of Ciprofloxacin
摘要： A novel kind of g-C3N4/rectorite composite with high visible-light photoactivity was developed via a mild and cost effective two-step process. Cipro?oxacin (CIP), a typical antibiotic, was applied to evaluate the photoactivity of the received catalysts. Furthermore, the by-products of CIP photodegradation were analyzed and the possible degradation pathways were also discussed. Compared with bare photocatalysts, the received composite possessed well reusability and higher photoactivity towards CIP. According to the characterization analysis results, layered g-C3N4 was successfully immobilized on layered rectorite, which could not only promote its adsorption capacity but also provide more reactive sites for CIP adsorption and photodegradation. Compared with bare g-C3N4, the photoactivity of the prepared composite was signi?cantly enhanced. The enhancement should be mainly due to the lower recombination rate of photogenerated carriers and the improved adsorption capacity toward CIP. This study demonstrated that the obtained g-C3N4/rectorite composite should be a promising alternative material in wastewater treatment.
关键词： rectorite,wastewater treatment,photocatalysis,cipro?oxacin,g-C3N4
更新于2025-09-04 15:30:14
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Hydroxy-carbonate-assisted synthesis of high porous graphitic carbon nitride with broken of hydrogen bonds as a highly efficient visible-light-driven photocatalyst
摘要： Graphite carbon nitride (g-C3N4) is a promising candidate as an efficient, affordable, and sustainable alternative photocatalyst owing to its unique physical and chemical properties. However, the photocatalytic activity of pristine g-C3N4 is still far below what is expected, because of its insufficient active site and high electron-hole recombination rates. Herein, we develop a novel strategy ― a one-step hydroxy-carbonate-assisted route ― to try to overcome these disadvantages in g-C3N4 nanosheets by creating substantial pores ranging from mesoporous to macropore, which are mainly caused by the partial breaking of hydrogen bonds and removing of magnesium oxide. Luxuriant pores in g-C3N4 not only serve as a reaction center by providing a large number of active sites at pore edges, but also effectively improve the photogenerated carrier separation by shortening their transfer lengths. The highly efficient visible-light photocatalytic activity of porous g-C3N4 nanosheets are demonstrated by degrading methyl blue (MB) and gentian violet (GV) as models, which its degradation rate constant is respectively more than 109 times and 12 times higher than those of pristine g-C3N4. Meanwhile, the high porous g-C3N4 has robust stability. The simple and effective strategy proposed here provides a direct route to highly functionalized g-C3N4 nanosheets and other layered semiconductors for various applications.
关键词： transfer of electrons,one-step route,high porous g-C3N4,hydroxy-carbonate-assisted route,photocatalysis
更新于2025-09-04 15:30:14
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Visible-light-responsive bismuth oxybromide/graphite-like C3N4 hybrid material and its application in photocatalysis via internal electric field
摘要： In this work, we propose a facile route to obtain BiOBr/ graphite-like C3N4 hybrid material, which was constructed by in situ depositing BiOBr onto the surface of g-C3N4 as a template via self-assembly procedure at room temperature. This method describes the use of g-C3N4/BiOBr nanocomposite for the superior photocatalytic performances under visible light excitation (λ > 420 nm). The crystalline phase, morphology, textile structure and components of the samples were studied by several tools such as X-ray diffraction, transmission electron microscopy, N2 adsorption–desorption, energy dispersive X-ray spectrum, Fourier transform infrared spectroscopy and Raman spectroscopy. The optical, photoelectrochemical properties and band structure were measured by ultraviolet–visible diffuse reflectance spectroscopy, steady-state photoluminescence spectra, photocurrent response analysis, electrochemical impedance spectra and valence-band X-ray photoelectron spectroscopy techniques, respectively. In addition, the catalytic activities of the hetero-structural material were broadly investigated and compared with single BiOBr or g-C3N4 alone in the same reaction. The as-obtained BiOBr/g-C3N4 composite showed distinctive advantages over BiOBr alone and universality for various substrate, i.e., dichloronaphthol degradation and reduction efficiency of Cr (VI) over BiOBr/g-C3N4 was increased by up to 3 and 2.5 times, respectively. The enhanced photocatalytic activity of the as-prepared BiOBr/g-C3N4 complex was mainly contributed to the effective charge transfer, which can further cause the establishment of the internal electric field in the interface between BiOBr and g-C3N4 to boost the space charge separation. This work gives a new route for designing high efficient semiconductor hybrid photocatalyst with broad absorption region as well as quick charge separation.
关键词： Graphite-like C3N4,BiOBr,Self-assembly,Photoelectrochemical,Internal electric field
更新于2025-09-04 15:30:14
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Combination of CuS and g-C3N4 QDs on upconversion nanoparticles for targeted photothermal and photodynamic cancer therapy
摘要： Combined therapy with multimodal therapeutic agents based on nanomaterials has been shown as a promising approach to cancer treatment. In this report, a highly efficient multifunctional anti-cancer nanocomposite was fabricated by assembling a photothermal agent (CuS nanoparticles) and a photodynamic agent (g-C3N4 quantum dots) on upconversion nanoparticles (UCNPs) after mesoporous silica coating. Then, the surface modification of the obtained nanocomposite (abbreviated as CUSCs) with polyethylene glycol (PEG) and folic acid (FA) endows the final sample (denoted as CUSCs-PEG-FA) with an excellent cancer cell targeting effect and biocompatibility. In this nanoplatform, CuS nanoparticles are an inorganic substance with low toxicity and high photothermal conversion efficiency. g-C3N4 QDs have excellent biocompatibility and are beneficial for cellular uptake due to their small size. UCNPs can be excited by near-infrared (NIR) light to produce ultraviolet and visible (UV-vis) light emission, which overlaps with the UV absorption peak of high fluorescence g-C3N4 quantum dots (QDs). Therefore, when the nanocomposite is excited by 808 nm NIR light, a synergistic treatment effect will be presented. Since the wavelengths absorbed by the chosen photothermal agent and the photosensitizer are different, sufficient utilization of energy can be achieved. Combining photothermal therapy (high photothermal conversion efficiency of 27.4%) and photodynamic therapy can inhibit cancer more effectively compared to any monotherapy. Moreover, as a result of the inherent performance ability of the doped rare earth ions, excellent applicability for computed tomography (CT), upconversion luminescence (UCL) and magnetic resonance imaging (MRI) has been achieved.
关键词： CuS,Upconversion,g-C3N4,Synergistic treatment,Biocompatibility
更新于2025-09-04 15:30:14
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Enzyme-free multicolor biosensor based on Cu2+-modified carbon nitride nanosheets and gold nanobipyramids for sensitive detection of neuron specific enolase
摘要： In this work, we have synthesized Cu2+-modified carbon nitride nanosheets (Cu2+-C3N4) as peroxidase mimic catalytic substance, which is more active than the horseradish peroxidase enzyme in extreme environments. Gold nanobipyramid (Au NBP) is a good chromogenic substrate for multicolor display because the longitudinal plasmon bands of AuNRs can be easily tuned by adjusting their aspect ratios and used as an excellent indicator for colorimetric detection of immunoassays. The generation of TMB2+ from sandwich complex (peroxidase-like catalysis) efficiently etches Au NPBs to produce multicolor variations from brown to olive, green, blue, purple, purple, red, pink, and colorless in presence of varied concentrations of neuron specific enolase (NSE). The experimental results show that the colorimetric detection ranging from 312.5 to 20,000 pM with a detection limit of 92.8 pM, which is higher than other multicolor based sensors. The Cu2+-C3N4 nanosheets and Au NBPs based colorimetric visual (naked eye) semi-quantitative method as a potential platform towards the detection of important biomolecules in clinical and therapeutic applications. The proposed method is simple, low-cost and enzyme-free to detect NSE for the first time.
关键词： Gold nanobipyramids,Cu2+-C3N4 nanosheets,Mimic enzyme activity,Neuron specific enolase,Biosensor
更新于2025-09-04 15:30:14
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Bimetallic PtAu Alloy Nanoparticles-Integrated g-C <sub/>3</sub> N <sub/>4</sub> Hybrid as an Efficient Photocatalyst for Water-to-Hydrogen Conversion
摘要： Herein, we report the synthesis of metal (Pt and Au) and metal alloy (PtAu) nanoparticles (NPs) integrated graphitic carbon nitride (g?C3N4) hybrid using a facile solvothermal route for water splitting application. The metal and metal alloy NPs with varying percentages of Pt and Au are found to be in the size range of 3?5 nm and uniformly distributed on the g?C3N4 sheets. The metal and metal alloy NPs act as cocatalyst for g?C3N4 to enhance the photocatalytic activity for hydrogen (H2) generation through higher light absorption and efficient charge separation. The alloy composition plays an important role to maximize the photoactivity, with an optimized PtAu/g?C3N4 sample delivered 1009 μmol g?1 h?1 of H2. The visible light assisted photocatalytic H2 evolution is further investigated with the optimized PtAu alloy NPs integrated g?C3N4. This study presents a robust, stable, and easily synthesizable PtAu/g?C3N4 hybrid material as a promising photocatalyst for H2 generation through water splitting.
关键词： alloy nanoparticles,heterostructure,g?C3N4,water splitting,bimetallic,photoelectrochemical
更新于2025-09-04 15:30:14