Porosity Of Metal-organic Frameworks Research Articles

In-situ one-step synthesis of activated Carbon@MIL-101 (Cr) composites for hydrogen storage

Metal-organic frameworks (MOFs) unlocked new prospects of developing novel adsorbing materials for H2 storage. However, MOF porosity is not yet fully utilized. To compensate for that disadvantage, we synthesized MIL-101(Cr) MOF-based activated carbon AC@MIL-101 (Cr) composites using in situ hydrothermal method. Different amounts of activated carbon (AC) derived from fir bark were added to adjust the pore structure of the resulting MOF-based composites. The pore number and their sizes increased and decreased, respectively, after pristine MIL-101(Cr) was combined with AC. The surface area and pore volume of pristine MIL-101(Cr) were equal to 2299 m2/g and 1.06 cm3/g, respectively. These values became equal to 3367 m2/g and 1.64 cm3/g after AC was combined with MIL-101(Cr) to form AC@MIL-101(Cr) composite. The highest H2 uptake by AC@MIL-101(Cr) was equal to 6.93 wt % at 77 K and 40 bar. Such excellent hydrogen storage performance (a 32.3% increase than what was observed for unmodified MIL-101(Cr) material) was attributed to a synergy between AC and MIL-101(Cr).

A Potential Roadmap to Integrated Metal Organic Framework Artificial Photosynthetic Arrays.

Metal organic frameworks (MOFs), a class of coordination polymers, gained popularity in the late 1990s with the efforts of Omar Yaghi, Richard Robson, Susumu Kitagawa, and others. The intrinsic porosity of MOFs made them a clear platform for gas storage and separation. Indeed, these applications have dominated the vast literature in MOF synthesis, characterization, and applications. However, even in those early years, there were hints to more advanced applications in light-MOF interactions and catalysis. This perspective focuses on the combination of both light–MOF interactions and catalysis: MOF artificial photosynthetic assemblies. Light absorption, charge transport, H2O oxidation, and CO2 reduction have all been previously observed in MOFs; however, work toward a fully MOF-based approach to artificial photosynthesis remains out of reach. Discussed here are the current limitations with MOF-based approaches: diffusion through the framework, selectivity toward high value products, lack of integrated studies, and stability. These topics provide a roadmap for the future development of fully integrated MOF-based assemblies for artificial photosynthesis.

Synthesis of metal-organic framework HKUST-1 via tunable continuous flow supercritical carbon dioxide reactor

Scaling-up synthesis of metal–organic framework (MOF) materials is critical for their practical applications. Due to its unique properties, supercritical carbon dioxide (scCO2) is an attractive media single-step synthesis of MOFs. This paper, for the first time, presents a rapid synthesis of the high-quality copper-based MOF HKUST-1 in a continuous flow scCO2 flow reactor, evaluating the effects of pressure, scCO2 injection temperature, scCO2 mass fraction, and the reactor residence time on HKUST-1 properties over 23 experiments. The morphology, crystallinity, and porosity of MOF are characterized by scanning electron microscopy, X-ray diffraction, and physisorption analysis. Four sets of experiments showed excellent repeatability in particle size and specific surface area yielding high-quality HKUST-1 MOFs. The particle sizes ranged from 55 to 300 nm with an average of 135 nm, and the BET surface -- from 1,374 to 2,389 m2·g−1 with an average of 1,712 m2·g−1. Longer residence time increased particle size and led to MOF shape change from spherical to octahedral; however, these did not significantly correlate with MOF surface area. Pressure variation in the 8–10 MPa range did not impact HKUST-1 properties. Reactant temperature variations between 80 and 120 °C showed a weak correlation with particle size. Increasing reactor section temperature independently of the reactant temperature had a statistically significant negative correlation to particle size, r-value = -0.86, and p-value = 0.04. The scCO2-assisted synthesis yielded high-quality MOFs under all studied conditions with residence time in the range of 70–170 s, demonstrating the robustness and high throughput of the method.

Two Solvent-Induced In(III)-Based Metal-Organic Frameworks with Controllable Topology Performing High-Efficiency Separation of C2H2/CH4 and CO2/CH4.

For pure acetylene manufacturing and natural gas purification, the development of porous materials displaying highly selective C2H2/CH4 and CO2/CH4 separation is greatly important but remains a major challenge. In this work, a plausible strategy involving solvent-induced effects and using the flexibility of the ligand conformation to make two In(III) metal-organic frameworks (MOFs) is developed, showing topological diversity and different stability. The X-shaped tetracarboxylic ligand H4TPTA ([1,1':3',1″-terphenyl]-4,4',4″,6'-tetracarboxylic acid) was selected to construct two new heteroid In MOFs, namely, {[CH3NH3][In(TPTA)]·2(NMF)} (MOF 1) and {[In2(TPTA)(OH)2]·2(H2O)·(DMF)} (MOF 2). MOF 1 is a (4, 4)-connected net showing a pts topology with a large channel that is not conducive to fine gas separation. By contrast, with the reduction of SBU from uninucleated In to an {In-OH-In}n chain, MOF 2 has a (4, 6)-connected net with the fsc topology with an ∼5 Å suitable micropore to confine matching small gas. The permanent porosity of MOF 2 leads to the preferential adsorption of C2H2 over CO2 with superior C2H2/CH4 (332.3) and CO2/CH4 (31.2) separation selectivities. Meanwhile, the cycling dynamic breakthrough experiments showed that the high-purity C2H2 (>99.8%) capture capacities of MOF 2 were >1.92 mmol g-1 from a binary C2H2/CH4 mixture, and its separation factor reached 10.

Low‐Temperature Melting and Glass Formation of the Zeolitic Imidazolate Frameworks ZIF‐62 and ZIF‐76 through Ionic Liquid Incorporation

AbstractHybrid glass formation offers a potential route for processing metal‐organic frameworks (MOFs) in bulk shapes, however, only a small number of MOFs have proven to be meltable. For the non‐meltable zeolitic imidazolate framework ZIF‐8, ionic liquid (IL) incorporation has recently been found to reduce the melting temperature to below the thermal decomposition temperature, thus, enabling the formation of IL@ZIF‐8 glasses. Here, the effect of IL incorporation on the enthalpic response of some zeolitic imidazolate frameworks (ZIFs) and other MOFs upon heating is reported. For ZIF‐62, ZIF‐67, ZIF‐76, and MIL‐68, the accessibility of the metal site and MOF porosity govern the meltability of IL@MOF composites. IL incorporation enables the formation of ZIF‐76 glasses, and significantly reduces the melting temperature of ZIF‐62 but does not seem to facilitate the melting of ZIF‐67 or MIL‐68 (before thermal decomposition). Although the thermal stability limit of the IL plays an important role in governing the melting window of the IL@MOF composite, by careful selection of the melting temperature, thermal decomposition and compositional changes upon melting can be avoided to a greater extent. IL incorporation seems to offer a more universal route for melting MOFs, but requires careful adaption to the specific MOF architecture.

Engineering of metal-organic framework nanomaterials on long-period fiber grating for acetone vapor sensing.

Metal-organic framework (MOF) material is one of the most promising porous nanomaterials for volatile organic compound (VOC) adsorption and sensing. The large surface area and the high porosity of MOF contribute to the high sensitivity of MOF-based VOC sensors. In this study, we engineer the coating of the zeolitic imidazolate framework material ZIF-8 grown on the surface of a long-period fiber grating (LPFG) for acetone vapor sensing. Being a periodic structure formed in a single-mode optical fiber, an LPFG is designed to couple light from the core to the cladding of the fiber at a specific resonance wavelength. Adsorption of acetone vapor molecules in the framework of the ZIF-8 coating can change the refractive index of the coating and cause a shift in the resonance wavelength of the LPFG. The sensitivity of the resonance shift of the LPFG to the acetone vapor concentration depends strongly on the thickness of the ZIF-8 coating. To create a dense ZIF-8 coating, at least five growth cycles of ZIF-8 (30 min growth for one cycle) are required, and nine growth cycles can create a 500 nm thick coating. The LPFG coated with nine growth cycles of ZIF-8 provides a high sensitivity of 21.9 nm ppm-1, a low detection limit of 1.4 ppm, and a wide detection range of about 1500 ppm. Our results can facilitate the development of high-performance optical fiber sensors based on MOF for VOC detection.

Vapor-Phase Processing of Metal-Organic Frameworks.

ConspectusPorous metal-organic frameworks (MOFs), formed from organic linkers and metal nodes, have attracted intense research attention. Because of their high specific surface areas, uniform and adjustable pore sizes, and versatile physicochemical properties, MOFs have shown disruptive potential in adsorption, catalysis, separation, etc. For many of these applications, MOFs are synthesized solvothermally as bulk powders and subsequently shaped as pellets or extrudates. Other applications, such as membrane separations and (opto)electronics, require the implementation of MOFs as (patterned) thin films. Most thin-film formation methods are adapted from liquid-phase synthesis protocols. Precursor transport and nucleation are difficult to control in these cases, often leading to particle formation in solution. Moreover, the use of solvents gives rise to environmental and safety challenges, incompatibility issues with some substrates, and corrosion issues in the case of dissolved metal salts. In contrast, vapor-phase processing methods have the merits of environmental friendliness, control over thickness and conformality, scalability in production, and high compatibility with other workflows.In this Account, we outline some of our efforts and related studies in the development and application of vapor-phase processing of crystalline MOF materials (MOF-VPP). We first highlight the advances and mechanisms in the vapor-phase deposition of MOFs (MOF-VPD), mainly focusing on the reactions between a linker vapor and a metal-containing precursor layer. The characteristics of the obtained MOFs (thickness, porosity, crystallographic phase, orientation, etc.) and the correlation of these properties with the deposition parameters (precursors, temperatures, humidity, post-treatments, etc.) are discussed. Some in situ characterization methods that contributed to a fundamental understanding of the involved mechanisms are included in the discussion. Second, four vapor-phase postsynthetic functionalization (PSF) methods are summarized: linker exchange, guest loading, linker grafting, and metalation. These approaches eliminate potential solubility issues and enable fast diffusion of reactants and guests as well as a high loading or degree of exchange. Vapor-phase PSF provides a platform to modify the MOF porosity or even introduce new functionalities (e.g., luminescence photoswitching and catalytic activity). Third, since vapor-phase processing methods enable the integration of MOF film deposition into a (micro)fabrication workflow, they facilitate a range of applications with improved performance (low-k dielectrics, sensors, membrane separations, etc.). Finally, we provide a discussion on the limitations, challenges, and further opportunities for MOF-VPP. Through the discussion and analysis of the vapor-phase processing strategies as well as the underlying mechanisms in this Account, we hope to contribute to the development of the controllable synthesis, functionalization, and application of MOFs and related materials.

FeCo alloy encased in nitrogen-doped carbon for efficient formaldehyde removal: Preparation, electronic structure, and d-band center tailoring

Formaldehyde is a typical indoor air pollutant that has posed severely adverse effects on human health. Herein, a novel FeCo alloy nanoparticle-embedded nitrogen-doped carbon (FeCo@NC) was synthesized with the aim of tailoring the transition-metal d-band structure toward an improved formaldehyde oxidation activity for the first time. A unique core@shell metal–organic frameworks (MOFs) architecture with a Fe-based Prussian blue analogue core and Co-containing zeolite imidazole framework shell was firstly fabricated. Then, Fe and Co ion alloying was readily achieved owing to the inherent MOF porosity and interionic nonequilibrium diffusion occurring during pyrolysis. High-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectra confirm that small FeCo alloys in situ form in FeCo@NC, which exhibits a higher formaldehyde removal efficiency (93%) than the monometallic Fe-based catalyst and a remarkable CO2 selectivity (85%) at room temperature. Density functional theory calculations indicate the number of electrons transferred from the metal core to the outer carbon layer is altered by alloying Fe and Co. More importantly, a downshift in the d-band center relative to the Fermi level occurs from − 0.93 to − 1.04 eV after introducing Co, which could alleviate the adsorption of reaction intermediates and greatly improve the catalytic performance.

Ionic Salts@Metal-Organic Frameworks: Remarkable Component to Improve Performance of Fabric Filters to Remove Particulate Matters from Air.

The elimination of particulate matters (PMs) from the air is very important for our sustainability. In this study, highly porous metal-organic frameworks (MOFs) like MIL-101 and UiO-67 were first modified, coated onto cotton, and applied in PM removal via filtration. Ionic salts (ISs) like CaCl2 and LiCl, after loading onto the MOFs, remarkably increased the PM removal efficiency. For example, CaCl2(20)@MIL-101/cotton shows 5.7 times the quality factor (QF, which is the most important parameter in filtration) of that of bare cotton and has the most competitive performances in PM removal (with the highest QF of 0.085 Pa-1) compared to any filter modified with porous materials or commercial filters. The noticeable performances of ISs@MOFs can be explained by the contribution of charge separation (that is effective for electrostatic interactions with PMs) of ISs and the high porosity of MOFs. Moreover, how MOFs with small pores of a few nanometers or less can remove large PMs with sizes in the micron range could be explained. Finally, loading ISs onto highly porous materials can be a promising strategy to improve the performances of filters to remove PMs from the air.

Slippery liquid-infused porous surface based on MOFs with excellent stability

Slippery liquid-infused porous surface (SLIPS) with good water repellency has attracted many attentions. However, its durability should be enhanced for practical application. Herein, a durable SLIPS is designed based on metal-organic frameworks (MOFs) for the first time, which serve as reservoirs to trap and store the lubricant. Owing to the strong interaction with lubricant, rough surface structure, as well as the abundant porosity of MOFs, the so-obtained SLIPS based on MOFs (SLIPS-M) possesses good water repellency with a sliding angle of approx. 2° and excellent stability even under O2 plasma etching, water boiling and acid immersing.

(Invited) Defective Hierarchical Porous Copper-Based Metal-Organic Frameworks Synthesised Via Facile Acid Etching Strategy

Introducing hierarchical pore structure to microporous materials such as metal-organic frameworks (MOFs) can be beneficial for reactions where the rate of reaction is limited by low rates of diffusion or high pressure drop. This advantageous pore structure can be obtained by defect formation, mostly via post-synthetic acid etching, which has been studied extensively on water-stable MOFs. Here we show that a water-unstable HKUST-1 MOF can also be modified in a corresponding manner by using phosphoric acid as a size-selective etching agent and a mixture of dimethyl sulfoxide and methanol as a dilute solvent. Interestingly, we demonstrate that the etching process which is time- and acidity- dependent, can result in formation of defective HKUST-1 with extra interconnected hexagonal macropores without compromising on the bulk crystallinity. These findings suggest an intelligent scalable synthetic method for formation of hierarchical porosity in MOFs that are prone to hydrolysis, for improved molecular accessibility and diffusion for catalysis. Figure 1

Direct X-ray and electron-beam lithography of halogenated zeolitic imidazolate frameworks.

Metal-organic frameworks (MOFs) offer disruptive potential in micro- and optoelectronics because of the unique properties of these microporous materials. Nanoscale patterning is a fundamental step in the implementation of MOFs in miniaturized solid-state devices. Conventional MOF patterning methods suffer from low resolution and poorly defined pattern edges. Here, we demonstrate the resist-free, direct X-ray and electron-beam lithography of MOFs. This process avoids etching damage and contamination and leaves the porosity and crystallinity of the patterned MOFs intact. The resulting high-quality patterns have excellent sub-50-nm resolution, and approach the mesopore regime. The compatibility of X-ray and electron-beam lithography with existing micro- and nanofabrication processes will facilitate the integration of MOFs in miniaturized devices.

A fluorometric metal-organic framework oxygen sensor: from sensitive powder to portable optical fiber device

Abstract Nowadays, the development of high-sensitivity oxygen probes and portable detection devices are urgent required. Lanthanide metal-organic frameworks (MOFs), combining the advantages of lanthanide luminescent features and the inherent porosity of MOFs, show great potential for highly sensitive O2 sensing. At the same time, optical fiber sensors have proven to be a simple and effective detection platform for portable and actual monitoring. In this work, we designed an O2-sensitive porous lanthanide MOF by elaborately selecting organic ligand with the suitable high triplet-state level. The luminescent intensity of as-synthesized EuNDC (1,4-H2NDC = 1,4-naphthalenedicarboxylic acid) can be effectively quenched by O2, giving rise to the most outstanding detection performance than other reported lanthanide MOFs with high sensitivity (93.5% quenched at 1 bar O2, I0/I100 = 15.4, KSV = 13.3 bar-1, LOD = 0.21 mbar), good reversibility, and short response/recovery times (10/70 s). After that, we proposed and developed a reflection type optical fiber sensor by integrating EuNDC and silica fiber in PDMS film for remote, in-field and real-time O2 monitoring.

Electrically Conductive Metal-Organic Frameworks.

Metal–organic frameworks (MOFs) are intrinsically porous extended solids formed by coordination bonding between organic ligands and metal ions or clusters. High electrical conductivity is rare in MOFs, yet it allows for diverse applications in electrocatalysis, charge storage, and chemiresistive sensing, among others. In this Review, we discuss the efforts undertaken so far to achieve efficient charge transport in MOFs. We focus on four common strategies that have been harnessed toward high conductivities. In the “through-bond” approach, continuous chains of coordination bonds between the metal centers and ligands’ functional groups create charge transport pathways. In the “extended conjugation” approach, the metals and entire ligands form large delocalized systems. The “through-space” approach harnesses the π–π stacking interactions between organic moieties. The “guest-promoted” approach utilizes the inherent porosity of MOFs and host–guest interactions. Studies utilizing less defined transport pathways are also evaluated. For each approach, we give a systematic overview of the structures and transport properties of relevant materials. We consider the benefits and limitations of strategies developed thus far and provide an overview of outstanding challenges in conductive MOFs.

Mitigation of Pressure-Induced Amorphization in Metal-Organic Framework ZIF-8 upon EPR Control.

Pressure-induced amorphization is one of the processes inhibiting functional properties of metal-organic frameworks (MOFs). Such amorphization often occurs when MOFs are being shaped for practical applications, as well as during certain exploitations. Typically, the porosity of MOFs, which is crucial for sorption, separation, and catalysis, suffers under external pressure. We report a new experimental approach for efficient monitoring of pressure-induced processes in MOFs that employs trace amounts of spin probes (stable nitroxide radicals) embedded in the pores of MOF and detection by electron paramagnetic resonance (EPR). EPR spectra of spin probes in MOF ZIF-8 demonstrate significant changes upon pressure-induced amorphization, whose extent can be quantitatively determined from the spectral shapes. Moreover, stabilization of ZIF-8 against amorphization via reversible adsorption of various guests was studied using this approach. Mitigation effect depends on diffusion parameters and localization of guest molecules in the cavity, and maintaining of the structure and permeability up to 80% was achieved even at 1.15 GPa applied. Therefore, the proposed methodology allows significant mitigation of MOF amorphization under external pressure and conveys further perspectives of the controlled adjustment of stabilizing agents for various MOFs and their applications.

Highly sensitive detection to gallic acid by polypyrrole-based MIES supported by MOFs-Co2+@Fe3O4

Supported by metal-organic frameworks (MOFs), a new molecular imprinted electrochemical sensor (MIES) taking nano-structure Co2+@Fe3O4 as the support point of receptor was developed for highly sensitive detection of GA in this paper. Gold electrode was modified with Co2+@Fe3O4, then Co2+@Fe3O4/Au was soaked and compounded to Fe3O4@ZIF-67/Au. MIPs film was obtained by potentiostatic polymerization with polypyrrole as monomer and GA as template. SEM, EDS, FTIR, XRD, DPV and EIS characterizations indicate the success of the preparation of the modified electrode. By optimization, the Δi response of MIP/Fe3O4@ZIF-67/Au was strengthened from 25.38 μA to 30.84 μA. The MIP/Fe3O4@ZIF-67/Au sensor showed a superior sensitivity with a lower LOD of 0.297pM (S/N = 3) and a wider linear range of 6–600pM for GA detection, which profits from the combination of high surface area of Co2+@Fe3O4 and high porosity of MOFs. Because of the specificity of molecular imprinted polymers (MIPs), our sensor showed advanced selectivity and not affected by similar structure interfering substances. In addition, the stability, reproducibility and real-sample detection were also satisfactory with the recovery rates between 89.5% and 118.4% and the RSD were lower than 5.5%. This sensitive and simple method can be further used to prepare polypyrrole-based MIES suported by MOFs-Co2+@Fe3O4 for highly sensitive detection of other small and weight molecules.

A historical overview of the activation and porosity of metal-organic frameworks.

Since the first reports of metal-organic frameworks (MOFs), this unique class of crystalline, porous materials has garnered increasing attention in a wide variety of applications such as gas storage and separation, catalysis, enzyme immobilization, drug delivery, water capture, and sensing. A fundamental feature of MOFs is their porosity which provides space on the micro- and meso-scale for confining and exposing their functionalities. Therefore, designing MOFs with high porosity and developing suitable activation methods for preserving and accessing their pore space have been a common theme in MOF research. Reticular chemistry allows for the facile design of MOFs from highly tunable metal nodes and organic linkers in order to realize different pore structures, topologies, and functionalities. With the hope of shedding light on future research endeavors in MOF porosity, it is worthwhile to examine the development of MOFs, with an emphasis on their porosity and how to properly access their pore space. In this review, we will provide an overview of the historic evolution of porosity and activation of MOFs, followed by a synopsis of the strategies to design and preserve permanent porosity in MOFs.

Understanding phonon properties in isoreticular metal-organic frameworks from first principles

Metal-organic frameworks (MOFs) are crystalline materials consisting of metal centers and organic linkers forming open and porous structures. They have been extensively studied due to various possible applications exploiting their large amount of internal surface area. Phonon properties of MOFs are, however, still largely unexplored, despite their relevance for thermal and electrical conductivities, thermal expansion, and mechanical properties. Here, we use quantum-mechanical simulations to provide an in-depth analysis of the phonon properties of isoreticular MOFs. We consider phonon band structures, spatial confinements of modes, projected densities of states, and group velocity distributions. We find that more complex linkers shift the spectral weight of the phonon density of states towards higher frequencies, while increasing the mass of the metal atoms in the nodes has the opposite effect. Due to the high porosity of MOFs, we observe a particularly pronounced polarization dependence of the dispersion of acoustic phonons with rather high group velocities for longitudinal acoustic modes. Interestingly, also for several optical phonon modes group velocities amounting to several thousand m/s are obtained. For heterogeneous systems like MOFs, correlating group velocities and the displacement of modes is particularly relevant. Here we find that high group velocities are generally associated with delocalized vibrations, while the inverse correlation does not necessarily hold. To quantify anharmonicities, we calculate mode Gr\"uneisen parameters, which we find to be significant only for phonons with frequencies below ~3 THz. The presented results provide the foundations for an in-depth understanding of the vibrational properties of MOF, and, thus, pave the way for a future rational design of systems with well-defined phonon properties.

A metal organic framework-ultrafiltration hybrid system for removing selected pharmaceuticals and natural organic matter

In this study, we combined metal organic frameworks (MOFs) with ultrafiltration (UF) hybrid systems (MOF-UF) to treat selected pharmaceutically active compounds (PhACs), including ibuprofen and 17α-ethinyl estradiol, and natural organic matter (NOM) (humic acid and tannic acid; ratios of 10:0, 5:5, and 0:10). Due to the high tunable porosity of MOFs, these materials have strong potential for removing contaminants and reducing fouling in adsorbent-UF hybrid systems. The average retention rate of PhACs in MOF-UF (53.2%) was enhanced relative to the UF only (36.7%). The average retention rate of NOM in the MOF-UF (86.1%) was higher than that with UF only (75.7%). Also, the average normalized flux of NOM in the MOF-UF (0.79) was better than that with UF only (0.74). This is because the PhACs were effectively adsorbed on the MOF due to their strong porous characteristics. We compared MOF-UF and powdered activated carbon-UF (PAC-UF) systems in terms of retention rates and flux decline. The average retention rates for the MOF-UF were higher relative to PAC-UF, by 4.6% for PhACs and 6.9% for NOM. However, although the normalized flux in the MOF-UF was better than that in the PAC-UF, for both PhACs and NOM, severe flux decline for NOMs was seen for with the MOF-UF and PAC-UF. We evaluated the effects of NOM with respect to fouling by applying a resistance-in-series model and found that fouling was dominantly affected by the molecular sizes of the solutes in the solution.

Metal-Organic Frameworks for Food Safety.

Food safety is a prevalent concern around the world. As such, detection, removal, and control of risks and hazardous substances present from harvest to consumption will always be necessary. Metal-organic frameworks (MOFs), a class of functional materials, possess unique physical and chemical properties, demonstrating promise in food safety applications. In this review, the synthesis and porosity of MOFs are first introduced by some representative examples that pertain to the field of food safety. Following that, the application of MOFs and MOF-based materials in food safety monitoring, food processing, covering preservation, sanitation, and packaging is overviewed. Future perspectives, as well as potential opportunities and challenges faced by MOFs in this field will also be discussed. This review aims to promote the development and progress of MOF chemistry and application research in the field of food safety, potentially leading to novel solutions.