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Simultaneous Unlocking Optoelectronic and Interfacial Properties of C <sub/>60</sub> for Ultrasensitive Immunosensing by Coupling to Metal?Organic Framework
摘要： Due to exceptional electron-accepting ability, light-absorption and delocalized conjugated structure, buckminsterfullerene (C60) has attracted fascinating interests in the field of organic solar cells. However, poor delocalization and accumulation of electrons for pristine C60 in physiological aqueous solution and difficulties in conjugation with biomolecules limit its extended photovoltaic applications in bioassay. Herein, we reported the non-covalent coupling of C60 to an electronically complementary porphyrin-derived metal-organic framework (PCN-224) with carboxyl-group terminals. Such assembly not only offered a friendly interface for bioconjugation but also resulted in a long-range ordering C60@PCN-224 donor-acceptor system that demonstrated an unprecedented photocurrent enhancement up to 10 times with respect to each component. As an example, by further cooperating with Nanobodies, the as-prepared C60@PCN-224 was applied to a photoelectrochemical (PEC) immunosensor for S100 calcium-binding protein B with by far the most promising detection activities. This work may open a new venue to unlock the great potential of C60 in PEC biosensing with excellent performances.
关键词： photoelectrochemical immunosensor,S100 calcium-binding protein B,Nanobodies,metal-organic framework,C60
更新于2025-09-11 14:15:04
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3D water-stable europium metal organic frameworks as a multi-responsive luminescent sensor for high-efficiency detection of Cr <sub/>2</sub> O <sub/>7</sub><sup>2?</sup> , MnO <sub/>4</sub><sup>?</sup> , Cr <sup>3+</sup> ions and SDBS in aqueous solution
摘要： A microporous europium metal–organic framework (Eu-MOF), namely, {[Eu3(bpydb)3(HCOO)(OH)2(DMF)]·3DMF·2H2O}n (1) with asymmetric trinuclear metal clusters extended by 4,40-(4,40-bipyridine-2,6-diyl) dibenzoic acid has been synthesized via the solvothermal method. PXRD of 1 confirms that it possesses excellent water stability and pH stability. The photo-luminescence properties of 1 exhibit effective recognition of Cr2O72?, MnO4?, and Cr3+ ions and SDBS. Furthermore, a wide linear range, high quenching constant and a low detection limit reveal that 1 can potentially act as a luminescence-based sensor for quantitative and highly sensitive detection of Cr2O72?, MnO4?, and Cr3+ ions as well as SDBS in aqueous solutions. To the best of our knowledge, the detection limit of 1 is the lowest value reported for Ln-MOF-based luminescent sensors to detect Cr2O72? ions (0.5 mM) in aqueous solutions. The use of a rare earth fluorescent probe for detecting MnO4? ions is not common. It is the first time that Ln-MOF as a fluorescence probe is used for detecting SDBS. Moreover, fluorescent-based test papers of 1 have also been prepared, which can be helpful to develop visual detection for Cr2O72?, MnO4?, and Cr3+ ions as well as SDBS in daily applications.
关键词： aqueous solution,SDBS,MnO4?,luminescent sensor,Cr2O72?,europium metal–organic framework,Cr3+ ions
更新于2025-09-10 09:29:36
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Preparation of amine functionalized g-C3N4@H/SMOF NCs with visible light photocatalytic characteristic for 4-nitrophenol degradation from aqueous solution
摘要： At ambience temperature, a facile and large-scale sonochemical synthesis route was used to synthesize graphitic carbon nitride@[Ti4C24H39N3O29] metal-organic framework nanocomposites (g-C3N4-X@YTi-MIL125-NH2 NCs, where X and Y stood for the weight percentages of g?C3N4 and the synthesis method of Ti-MIL125-NH2, respectively) having 2-Amino-1,4-benzenedicarboxylic acid (2-ATA) ligand with amine functional free groups. The obtained NCs were characterized by FT-IR, PXRD, FE-SEM, BET, UV-DRS, PL, EIS, and zeta potential. Moreover, g-C3N4-X@YTi-MIL125-NH2 capability to eliminate 4-nitrophenol (4-NP) contaminant from water via visible light illumination was explored. Our synthesized NCs under a facile, green ultrasonic technique (i.e. g-C3N4-30@STi-MIL125-NH2) had a higher percentage of degradation than those from hydrothermal technique (i.e. g-C3N4-30@HTi-MIL125-NH2) with degradation percentages of 75% and 57%, respectively, which resulted in effective mass transfer and separation of photo?generated charge carriers. Additionally, this higher percentage of degradation could be attributed to the larger surface area and unique morphology of the ultrasonically synthesized particles with higher homogeneity and better and non-agglomerated distribution. Furthermore, excellent reusability and stability were observed for g-C3N4-30@STi-MIL125-NH2. We also explored the role of some scavengers in the degradation procedures to investigate the effect of active species. The experimental results were used to describe the suggested mechanism capability for improved photocatalysis.
关键词： Sonochemistry,Photocatalytic degradation,4-Nitrophenol,Metal-organic Framework,g-C3N4@Ti-MIL125-NH2 NCs
更新于2025-09-10 09:29:36
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Metal Organic Frameworks Based Materials for Heterogeneous Photocatalysis
摘要： The increase in environmental pollution due to the excessive use of fossil fuels has prompted the development of alternative and sustainable energy sources. As an abundant and sustainable energy, solar energy represents the most attractive and promising clean energy source for replacing fossil fuels. Metal organic frameworks (MOFs) are easily constructed and can be tailored towards favorable photocatalytic properties in pollution degradation, organic transformations, CO2 reduction and water splitting. In this review, we ?rst summarize the different roles of MOF materials in the photoredox chemical systems. Then, the typical applications of MOF materials in heterogeneous photocatalysis are discussed in detail. Finally, the challenges and opportunities in this promising ?eld are evaluated.
关键词： solar energy,heterogeneous photocatalysis,metal-organic framework
更新于2025-09-10 09:29:36
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Evaluation of the reaction mechanism for photocatalytic degradation of organic pollutants with MIL-88A/BiOI structure under visible light irradiation
摘要： In this study, we synthesized novel visible light photocatalyst MIL-88A/BiOI using depositing BiOI particles on the surface of a metal–organic framework (MIL-88A). Photocatalytic application of binary composite MIL-88A/BiOI was obtained by discoloration of Methylene Blue (MB) and Acid Blue 92 (AB92) in aqueous solution under visible light source. The photodegradation experiments for treating organic dyes show that the MIL-88A/BiOI heterojunction structure possess a higher rate for decomposition of dyes due to the decreased aggregation of the BiOI nanoparticles, effective charge carrier separation and the synergistic effect between MIL-88A and BiOI samples as a heterojunction. Also, the MIL-88A/BiOI structure shows better photocatalytic degradation performance for anionic dyes (AB92) than for a cationic dye (MB). It was further found that ?OH and ?O2? radicals were the most important species responsible for the photodegradation test.
关键词： Visible light-driven,Photocatalyst,BiOI,MIL-88A metal organic framework
更新于2025-09-10 09:29:36
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Incarceration of iodine in a pyrene-based metal-organic framework
摘要： A pyrene-based metal–organic framework (MOF) SION-8 captures iodine (I2) vapour with a capacity of 460 mg g–1 MOF and 250 mg g–1 MOF at room temperature and at 75 °C, respectively. Single-crystal X-ray diffraction analysis and van der Waals-corrected density functional theory calculations confirm the presence of I2 molecules within the pores of SION-8 and their interaction with the pyrene-based ligands. The I2-pyrene interactions in the I2-loaded SION-8 lead to a 104-fold increase of its electrical conductivity compared to the bare SION-8. Upon adsorption, ≥95% of I2 molecules are incarcerated and cannot be washed out, signifying the potential of SION-8 towards the permanent capture of radioactive I2 at room temperature.
关键词： charge transfer,conductivity,impedance spectroscopy,iodine capture,metal–organic framework
更新于2025-09-10 09:29:36
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A Mixed-Ligand Metal-Organic Framework for Two-Photon Responsive Photocatalytic C-N and C-C Coupling Reactions
摘要： Multiple-photon photochemical process breaks the existing energy limitation of visible-light photocatalysis. Through careful incorporation of both bis(3,5-dicarboxyphenyl)-pyridine and bis(3,5-dicarboxyphenyl)methylpyridinium ligands into a single metal?organic framework, we reported herein photocatalytic C?N and C?C oxidative coupling reactions that evidenced the direct two-photon response process. Time-dependent luminescence decays studies demonstrated that the framework reached the same excited state by a two-photon absorption process as that reached via a single-photon absorption process, and the excited state could activate substrates even under NIR light irradiation. Under a 660 nm LEDs irradiation, both the photooxidative C?N coupling reaction of benzylamine to form benzylidene-1-phenylmethanamine, and the C?C coupling reaction between nitromethane and N-phenyl-trtrahydroisoquinoline were accelerated directly in a heterogeneous manner. Control experiments suggested that the minimal by-products were formed under the NIR light irradiation comparing to those of the UV light catalytic reactions. Importantly, photon intensity-dependent studies exhibited a nonlinear correlation between catalytic efficiency of MTV-MOFs and photon power intensity, verifying the two-photon responsive nature, which indicated that metal?organic framework with high-density and ordered photoactive motifs could enhance the two-photon absorption ability, thereby improve photocatalytic efficiency even under LEDs irradiation.
关键词： coupling reactions,two-photon photocatalysis,metal?organic framework,nonlinear optics,visible-light
更新于2025-09-09 09:28:46
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Metal-Organic Framework Derived Hierarchical Co/C@V2O3 Hollow Spheres as a Thin, Lightweight and High-Efficiency Electromagnetic Wave Absorber
摘要： Developing high-efficiency electromagnetic (EM) wave absorbing materials with light weight, thin thickness and wide absorption bandwidth is highly desirable for ever-developing electronic and telecommunication devices. Herein, hierarchical metal-organic framework (MOF)-derived Co/C@V2O3 hollow spheres were designed and synthesized through a facile hydrothermal, precipitation and pyrolysis method. The composite exhibits both excellent impedance matching and light weight due to the rational combination of hollow V2O3 spheres and porous Co/C. Additionally, multiple components enable a large dielectric and magnetic loss of the composite, giving rise to enhanced EM wave absorption performance with a maximum reflection loss (RL) of -40.1 dB and a broad effective absorption bandwidth (RL < -10 dB) of 4.64 GHz at a small thickness of 1.5 mm. This work provides insights into the design of hierarchical hollow and porous composites as a thin and lightweight EM wave absorbers with efficient absorption, which can also be extended to energy storage, catalysis and sensing.
关键词： Co/C@V2O3 composites,metal-organic framework,hierarchical hollow spheres,dielectric/magnetic composites,electromagnetic wave absorption
更新于2025-09-09 09:28:46
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Design of a Highly-Stable Pillar-Layer Zn(II) Porous Framework for Rapid, Reversible, and Multi-Responsive Luminescent Sensor in Water
摘要： The Hard-Soft-Acid-Base (HSAB) and dual-ligand strategies have been used to construct a pillar-layer luminescent metal–organic framework (MOF) {[Zn2(TRZ)2(DBTDC-O2)]?DMAc}n (1), in which H2DBTDC-O2 = S,S-dioxodibenzothiophen-3,7-dicarboxylic acid and HTRZ = 1,2,4-triazole. Thanks to its high stability in water and quadrangle microporous channels, MOF 1 can be served as a platform of recyclable multi-responsive luminescent sensor for Fe3+, Al3+, SiF6 2–, Cr2O7 2–, nitrofurantoin (NFT), and nitrofurazone (NFZ) in water. This is the first MOF-based sensor for detecting SiF6 2– anion via luminescent enhancement effect. Significantly, 1 also represents a unique example to probe NFZ or NFT by using transition metal MOFs in water, which exhibits the most sensitive sensing ability for NFZ (Ksv = 5.2 × 104 M–1) and NFT (Ksv = 1.8 × 105 M–1) via luminescent quenching.
关键词： Multi-responsive,Metal–organic framework,Water stability,Antibiotics detection,Luminescent sensor
更新于2025-09-09 09:28:46
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Ratiometric Monitoring of Thorium Contamination in Natural Water using a Dual-Emission Luminescent Europium Organic Framework
摘要： Traditional analytical methods of thorium contamination suffer from several disadvantages such as time-consuming procedure and equipment-intensive nature, leading to substantial challenges in rapid and onsite monitoring of thorium concentration in complex natural water systems. We report here the first case of luminescent metal organic framework based probe (ThP-1) for highly sensitive and selective self-calibrated sensing of Th4+ contamination in natural fresh water media with a notably facilitated detection procedure. The detection limit of ThP-1 was determined to be 24.2 μg/L, much lower than the thorium contamination standard of 246 μg/L in drinking water defined by the World Health Organization. Importantly, the detection procedure based on the rarely reported self-calibration manner is greatly beneficial on improving the detection accuracy. The self-calibrated luminescence evolution process is of great anti-interference ability capable of detecting thorium contamination in a wide concentration range from 24.2 μg/L to 300 mg/L, which can not be achieved directly by the traditional methods. The Th4+-selective luminescence response originates from the selective uptake and efficient enrichment of Th4+ by the host framework of ThP-1 through inner-sphere coordination, which is further confirmed by batch experiments, X-ray absorption spectroscopic study, and DFT calculations.
关键词： natural water,Th4+ detection,self-calibrated sensing,thorium contamination,luminescent metal organic framework
更新于2025-09-09 09:28:46