Magnetic Porous Carbon Research Articles

Development of magnetic porous carbon nano-fibers for application as adsorbents in the enrichment of trace Sudan dyes in foodstuffs

A novel kind of magnetic porous carbon nano-fibers (Fe3O4@P-CNFs) materials was successfully prepared and used as an adsorbent. Based on the above-mentioned adsorbent, a simple and effective magnetic disperse solid-phase extraction (MSPE) method was developed and first utilized to the enrichment and purification of five Sudan dyes (including Sudan I, Sudan II, Sudan III, Sudan IV, and Sudan Red 7B) in foodstuffs for the first time. High-performance liquid chromatography was used to determine the content of the Sudan dyes. The parameters affecting the extraction performance were studied and optimized, including the amount of the adsorbent and inorganic salt, type and the volume of the eluent, pH of the sample solution and extraction time. Under the optimized experimental conditions, the results show that the proposed method has a good linear relationship (r≥ 0.9993). The limits of detection range from 0.88 μg L−1 to 1.27 μg L−1. The recoveries range from 86.6% to 99.7% with the relative standard deviations ranging from 0.6% to 7.9% in the methodology validation. The above-mentioned results indicate that the proposed method is a sensitive and reliable procedure with good reproducibility for the detection of Sudan dyes residues in foodstuffs.

Facile preparation of magnetic porous carbon monolith from waste corrugated cardboard box for solar steam generation and adsorption

Porous carbon monoliths (PCMs) were prepared from waste corrugated cardboard box (WCCB) via slurrying in FeCl3 solution followed by molding and thermal treatment. The thermal process was analyzed by a thermogravimetric analyzer coupled with a Fourier transform infrared spectrometer. The evolution of physicochemical characteristics of PCMs was studied. The photothermal conversion and solar steam generation performances of the optimal sample (PCMFe/600) were evaluated. The adsorption properties of PCMFe/600 for methylene blue (MB) were investigated. Results showed that Fe3+ promoted the breaking of cellulose chains in WCCB, leading to the occurrence of pyrolysis of WCCB at lower temperatures and the reduction of activation energy by 76.63 kJ mol−1. Char yield raised because volatile radicals were captured by FeCl3-derived amorphous Fe(III) species, then involved in char formation. Amorphous Fe(III) continuously converted into Fe3O4 crystallites with carbonization temperature increasing from 400 to 700 °C, then α-Fe was formed at 800 °C via the carbothermal reduction of Fe3O4. FeCl3 was favorable to the formation of a developed microporous structure. Surface area significantly increased with carbonization temperature increasing from 400 to 600 °C due to the removal of volatiles. The etching of carbon by Fe3O4 above 700 °C also led to the increase of surface area. PCMFe/600 exhibited higher optical absorption than other samples due to its high graphite degree and porosity. It also had excellent photothermal performance; thus, solar steam yield was 1.46 times that of the pure water with the assistance of PCMFe/600. PCMFe/600 in floating state was effective in adsorption of MB from water. Besides, the adsorption behavior fitted Langmuir model with a monolayer adsorption capacity reached up to 70.9 mg g−1.

Synthesis and characterization of rice husk-based magnetic porous carbon by pyrolysis of pretreated rice husk with FeCl3 and ZnCl2

Rice husk-based magnetic porous carbon with high porosity and magnetization was synthesized by pyrolysis of pretreated rice husk with FeCl3 and ZnCl2. Thermogravimetric analyses (TGA) of the precursors were used to characterize the mechanism of the pyrolysis progress. The effects of ZnCl2 impregnation ratio and pyrolysis temperature on the properties of magnetic porous carbon were identified by ultimate analyses, scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, X-ray diffractometer (XRD), Raman spectrometer and vibrating sample magnetometer (VSM). Based on the results, the optimum ZnCl2 impregnation ratio of 1.0 and pyrolysis temperature of 600 °C were obtained when considering both of the porous characteristics and magnetic properties. Finally, the synergistic effect of combined pretreatment of hydrothermal carbonization (HTC) and alkali leaching and simultaneous activation and magnetization was confirmed as the possible reaction mechanism of synthesis of magnetic porous carbon from rice husk with the surface area of 1344.67 m2/g and saturation magnetization of 3.64 emu/g.

Synthesis of magnetic porous carbon composite derived from metal-organic framework using recovered terephthalic acid from polyethylene terephthalate (PET) waste bottles as organic ligand and its potential as adsorbent for antibiotic tetracycline hydrochloride

The widespread overuse of antibiotics has led to the serious risks human life and environmental sustainability. Even though porous carbon composite derived from metal-organic framework (MOF) has been recognized as an efficient adsorbent for sequestering antibiotics owing to its unique properties, the major drawback is the use of the expensive material, such as terephthalic acid (H2BDC), as an organic ligand, thus weakening its cost effectiveness and practical applicability. Herein, we successfully recovered H2BDC from polyethylene terephthalate (PET) waste bottles via ultrasound-assisted, phase-transfer-catalyzed alkaline hydrolysis under mild conditions. The process conditions were statistically optimized by applying response surface methodology (RSM) based on the Box-Behnken design. As results, 99.91–100% H2BDC recovery was achieved under the following optimized conditions: NaOH concentration = 14.5%; temperature = 83.2 °C; and time = 1.5 h. High-purity H2BDC was used as an organic ligand in the synthesis of magnetic porous carbon (α-Fe/Fe3C) composite derived from iron-based MOF, and its utilization as an adsorbent for the removal of TCH from aqueous solution was investigated. The as-prepared α-Fe/Fe3C composite comprised α-Fe, Fe3C, and graphitic carbon and exhibited mesoporous structure and superparamagnetic behavior, resulting in an effective adsorption performance and magnetic separation. Its adsorption properties were examined in terms of solution pH, contact time, initial TCH concentration, and temperature. Adsorption kinetics and isotherm data were well-suited to the pseudo-second-order and Langmuir models, respectively. Considering its excellent reusability and magnetic separability, the α-Fe/Fe3C composite showed immense potential for antibiotic-contaminated wastewater remediation.

Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites

Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites

Facile preparation of monolithic magnetic porous carbon acid catalysts via surface self-assembly method and their applications in conversion of xylose into furfural

Furfural is a versatile chemical derived from pentosane-rich agricultural and forestry residues. Considered as an important platform chemical, furfural can be converted into valuable chemicals and biofuels. The furfural production from xylose was produced through the hydrolysis and subsequent cyclodehydration reaction of xylose sugar catalyzed generally by various catalysts containing SO3H. Nevertheless, their tedious multi-step preparation and the final catalysts usually in the form of fine powder make them difficult to be separated from the liquid systems after use, leading to time consumption for the industrial scale production. In the this work, novel magnetic porous carbonaceous acid catalyst (SO3H-MPBG) in the form of monoliths have successfully been prepared using sugarcane bagasse as scaffold via a self-assembly surface coating method from phloroglucinol/glyoxylic acid precursors with soft-template F127 and Fe3+ as a source for magnetic iron particles. Then facile subsequent hydrothermal sulfonation with concentrated H2SO4 at 180°C resulted in magnetic mesoporous carbon bearing SO3H group (SO3H-MPBG). The SO3H-MPBG was characterized by various techniques including XRD, FT-IR, N2 sorption analysis, elemental analysis, and VSM. A SO3HMPBG showed strong magnetism due to the presence of iron magnetic particles and possessed a BET specific surface area of 252.96 m2/g. The sample showed acceptable xylose conversion (86.13%) and furfural selectivity (55.70%) when performed at 170°C for 3 h using γ-valerolactone (GVL) as a solvent. Besides, the catalyst was easily separated after the catalytic tests using a magnet, confirming its magnetic stability.

Magnetic porous carbons derived from cobalt(ii)-based metal-organic frameworks for the solid-phase extraction of sulfonamides.

In this work, the dispersive solid-phase extraction of sulfonamide antibiotics was evaluated using magnetic porous carbons derived from cobalt(ii)-based metal-organic frameworks. By direct carbonization under the inert atmosphere of Co-SIM-1, Co-MOF-74 and Co-DABCO MOFs, different magnetic porous carbons were prepared and characterized to study their structural, morphological, chemical and textural properties. Their performance for the simultaneous extraction of three sulfonamides (sulfadiazine, sulfamerazine and sulfamethazine), prior to HPLC analysis, was also evaluated, obtaining the best results (>95%) in the case of C/Co-SIM-1 carbon, probably due to its bimodal pore structure, high surface area and large amount of surface defects. Using this adsorbent, the effect of the solution pH and contact time on the adsorption of the sulfonamides, and the reusability of the carbon were studied.

Highly efficient removal of methyl blue from aqueous solution using a novel nitrogen-doped porous magnetic carbon

Highly efficient removal of methyl blue from aqueous solution using a novel nitrogen-doped porous magnetic carbon

Synthesis of 3D magnetic porous carbon derived from a metal-organic framework for the extraction of clenbuterol and ractopamine from mutton samples.

3D magnetic porous carbon (MPCK) was prepared using the metal-organic framework (MOF) MIL-100(Fe) as the carbon precursor by carbonisation and KOH activation strategies. Carbonisation and activation ensured that MPCK possessed excellent structural and thermal stability, strong magnetic responsiveness and high surface area. MPCK was used as an adsorbent for the magnetic solid-phase extraction of clenbuterol and ractopamine from mutton samples. The concentration levels of analytes were determined by ultra-high performance liquid chromatography-mass spectrometry. Under optimised extraction conditions, the peak area responded linearly to analytes over the concentration range from 0.05 μg L-1 to 40 μg L-1 (r ≥ 0.9972). The detection limits of clenbuterol and ractopamine were found to be 0.130 μg kg-1 and 0.150 μg kg-1, respectively. The satisfactory recoveries in mutton samples ranging from 95.64% to 114.65% indicated that 3D porous carbon is a promising adsorption material for the extraction of clenbuterol and ractopamine from complex biological matrixes.

Novel Synthetic Method for Magnetic Porous Carbon Materials for Efficient Adsorption of Organic Pollutants from Aqueous Solution

A novel method for the preparation of magnetic porous carbon materials (MPMs) with high specific surfaces was developed using hydroxymethylferrocene through the combination of chloromethylation, hypercross-linked polymerization, and vacuum carbonization. The MPMs were mainly composed of porous carbon and iron nanoparticles. The specific surface and maximum specific saturation magnetization of MPMs were 295.90 m2/g and 7.45 emu/g, respectively. Furthermore, organic dyes, organic pesticides, and antibiotics were chosen as model adsorbates to test the adsorption properties of MPMs. The adsorption capacity of MPMs for methyl red was up to 199.54 mg/g at 120 min, and the adsorption isotherm was proved to fit the Langmuir isotherm model. The reuse results confirmed that MPMs had an excellent regenerative capacity and reusability stability. Moreover, MPMs showed superior removal efficiency for the rice field pesticides (emamectin benzoate, imidacloprid) and antibiotics (ampicillin). The above observations demons...

Chromium (VI) adsorption and reduction by humic acid coated nitrogen-doped magnetic porous carbon

A humic acid coated nitrogen-doped magnetic porous carbon (HA-N-MPC) adsorbent was successfully synthesized using lignin isolated from black liquor as the main carbon source. SEM, TEM, FT-IR, XPS and N2 physisorption measurements showed the HA-N-MPC to possess a high specific surface area, a porous three dimensional structure with magnetic Fe3O4 nanoparticles uniformly embedded in the N-doped porous carbon matrix, and an abundance of surface functional groups for metal ion sorption. Cr(VI) adsorption experiments were subsequently carried out in aqueous solution at pH 2 using HA-N-MPC as the adsorbent. Results revealed that HA-N-MPC had a high adsorption capacity of 130.5mgg−1 for Cr(VI), with partial reduction of toxic Cr(VI) to nontoxic Cr(III) occurring on adsorption. The adsorption kinetics and equilibrium adsorption isotherm determined for Cr(VI) on HA-N-MPC obeyed the pseudo-second-order model and Langmuir isotherm model, respectively. After magnetic separation from the sorption medium and regeneration, HA-N-MPC retained excellent adsorption performance for Cr(VI).

Removal of Elemental Mercury from Flue Gas Using Microwave/Ultrasound-Activated Ce–Fe Magnetic Porous Carbon Derived from Biomass Straw

Magnetic adsorbent shows good development prospects for separation of Hg0 from flue gas because it can be recycled. In this work, a novel magnetic biomass porous carbon adsorbent was developed by loading active ingredients (Ce and Fe mixed oxides) on renewable maize straw carbon with large specific surface area. Microwave activation and ultrasound treatment were applied to improve porous structure of maize straw carbon and distribution of active components. The influence of process parameters on Hg0 capture and the removal mechanism were also investigated. The results reveal that CeFe11%(3/5)/MSWU700 possesses the optimal Hg0 removing performance and adsorption capacity at 140 °C. The characterization results show that microwave activation can greatly increase the specific surface area of biomass carbon to form excellent porous structure, and ultrasound-assisted impregnation can facilitate the dispersion of active ingredients on the surface of adsorbent. The presence of Hg2+ on the surface of CeFe11%(3/5)...

Combustion fabrication of magnetic porous carbon as a novel magnetic solid-phase extraction adsorbent for the determination of non-steroidal anti-inflammatory drugs

Based on a one-step combustion fabrication approach, a novel magnetic porous carbon (MPC) was fabricated using filter paper as porous carbon source and iron salts as magnetic precursors. The textural properties of the MPC were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), vibration sample magnetometer (VSM) and nitrogen absorption-desorption isotherms. The as-prepared MPC possessed a high specific surface area, a microstructure comprised of mesopores and strong magnetic response. It was employed as a magnetic solid-phase extraction (MSPE) adsorbent for the determination of three non-steroidal anti-inflammatory drugs (NSAIDs) in environmental water and biological samples coupled with high performance liquid chromatography (HPLC). The main parameters affecting extraction efficiency were investigated in detail and a satisfactory performance was obtained under the optimal conditions. The calibration curves were linear over the concentration ranging from 1 to 1200 μg L−1 for ketoprofen (KET) and 2–1200 μg L−1 for naproxen (NAP) and diclofenac (DCF) with determination coefficients (R2) between 0.9995 and 0.9997. The limits of detection (LODs) were in the range of 0.2–0.4 μg L−1. The intra- and inter-day relative standard deviations (RSDs) were less than 4.03% and 8.72%, respectively. The recoveries ranged from 84.67% to 113.73% with RSDs less than 7.76%. The satisfactory results confirmed the great potential of the novel MPC adsorbent for the extraction of NSAIDs from complex sample matrices.

Wheat straw-derived magnetic carbon foams: In-situ preparation and tunable high-performance microwave absorption

Recently, biomass-derived three-dimensional (3D) porous carbon materials have been gaining more interest as promising microwave absorbers due to their low cost, vast availability, and sustainability. Here, a novel 3D interconnected porous magnetic carbon foams are in-situ synthesized via a combination of sol-gel and carbonization process with wheat straw as the carbon source and FeCl3·6H2O as the magnetic regulating agent. During the process of foams formation, the lignocelluloses from the steam-exploded wheat straw are converted into interconnected carbon sheet networks with hierarchical porous structures, and the precursor FeCl3·6H2O is converted into magnetic nanoparticles uniformly embedded in the porous carbon foams. The generated magnetic nanoparticles are benefit to enhance the interface polarization and magnetic loss ability to improve the efficient complementarities between the dielectric and magnetic loss, thus increasing the impedance matching. The obtained sample treated at 600 °C displays the best microwave absorption (MA) performance. It presents a minimal reflection loss (RL) of −43.6 dB at 7.1 GHz and the effective bandwidth (RL < −10 dB) is 3.3 GHz with the thickness of 4.7 mm. The 3D porous structure, multi-interfaces and the synergy of dielectric loss and magnetic loss make great contribution to the outstanding MA performance.

From Polymer to Magnetic Porous Carbon Spheres: Combined Microscopy, Spectroscopy, and Porosity Studies

The facile preparation of polymer waste-derived microporous carbon microspheres (SBET800 m2/g) 100-300 μm in size, is reported at first. We have taken advantage of both, the crosslinked nature and the porous texture of the poly(4-ethylstyrene-co-divinylbenzene) microspheres, which allow the incoming anions and cations present in liquid media to enter and to remain segregated into the pores of the polymer microspheres as soon as the solvent is removed. Interestingly, the ZnCl2 phase, when incorporated in the microporous molecular architecture of the polymer, prevents the collapsing of the pore structure of thermosetting polymer spheres during the pyrolysis occurring at 800°C and acts as an activating agent of the carbon phase under formation, being responsible for the formation of an extended mesoporosity (30-200 A and 300-1000 A ranges). More interestingly, porous carbon microspheres with magnetic properties have been prepared from the ZnCl2-activated porous carbon spheres after impregnation with Fe nitrate solution and thermal treatment at 800°C. A multi-technique methodology to characterize more extensively the carbons at the micro/nanoscale is reported in the paper. More in detail, the morphology, structure, porous texture and the surface properties of the carbon and of the magnetic carbon microspheres have been investigated by scanning and transmission electron microscopy, atomic force microscopy, X-ray diffraction, N2 physisorption, diffuse reflectance UV-vis, Raman and infrared spectroscopies. Furthermore, magnetic properties have been revealed at the nano- and at the macroscale by magnetic force microscopy and simple magnetically guided experiments by permanent magnets. The multi-technique methodology presented in the paper allows in elucidating more extensively about the different characteristics of activated carbons. Notwithstanding the huge amount of literature on activated carbons, the precise control of both the structure and the surface has, for the most part, hidden the relevance of other properties at the molecular scale of the assembled architectures. On the other hand, recent studies indicate that by molecular design, nanostructured and porous carbonaceous materials could also be rationally proposed.

Enhanced adsorption of Rhodamine B by magnetic nitrogen-doped porous carbon prepared from bimetallic ZIFs

Heteroatom- doped porous carbons have been proposed as promising adsorbents for wastewater treatment. Here, a nitrogen-enriched magnetic porous carbon was prepared by using bimetallic zeolitic imidazolate frameworks (ZIFs) as the precursors and polyvinyl pyrrolidone (PVP) as the auxiliary carbon/nitrogen source, with direct carbonization at 900 °C. The obtained carbon was applied for removing Rhodamine B (RhB) from an aqueous solution. The maximum adsorption capacity for RhB was 137.1 mg/g, which is much higher than those of PVP/ZIF-8 and PVP/ZIF-67 carbons (73.6 mg/g and 87.9 mg/g, respectively), and it could be magnetically separated from the aqueous solution after adsorption.

N/S doped highly porous magnetic carbon aerogel derived from sugarcane bagasse cellulose for the removal of bisphenol‑A.

In this study, highly porous N/S doped magnetic carbon aerogel (N/S-MCA) was successfully fabricated using sugarcane bagasse based cellulose and used for the removal of bisphenol‑A (BPA) from aqueous solution. The fabricated N/S-MCA nanocomposite derived from cellulose was characterized by various analytical techniques and supports the formation of the N/S-MCA in good yield and high purity. The batch adsorption studies were used for the adsorption of BPA onto N/S-MCA. The maximum removal of the BPA (98-99%) by the N/S-MCA was noted at pH 7, temperature 343 K, and initial BPA concentration of 100 ppm. The adsorption process followed pseudo-second-order reaction kinetics, as well as Langmuir isotherms. The thermodynamic parameters of the adsorption (the Gibbs free energy, entropy, and enthalpy) supported the spontaneity of the adsorption process. The results revealed that the mechanism on the synergistic adsorption between N/S doped magnetic carbon aerogel and BPA will therefore be an important guideline to design a carbon based adsorbent for high-efficient adsorption of environmental pollutants.

Exonuclease I-assisted fluorescent method for ochratoxin A detection using iron-doped porous carbon, nitrogen-doped graphene quantum dots, and double magnetic separation.

In this paper, a fluorescent method was developed for ochratoxin A (OTA) detection that uses iron-doped porous carbon (MPC) and aptamer-functionalized nitrogen-doped graphene quantum dots (NGQDs-Apt) as probes. In this method, the adsorbance of the NGQDs-Apt on the MPC due to a π-π interaction between the aptamer and the MPC results in the quenching of the fluorescence of the NGQDs-Apt. However, since OTA interacts strongly with the aptamer, the presence of OTA leads to the detachment of the NGQDs-Apt from the MPC, resulting in the resumption of fluorescence from the NGQDs-Apt. When exonuclease I (Exo I) is also added to the solution, this exonuclease specifically digests the aptamer, leading to the release of the OTA back into the solution. This free OTA then interacts with another MPC-NGQDs-Apt system, inducing the release of more NGQDs into the solution, which enhances the fluorescent intensity compared to that of the system with no Exo I. Utilizing this behavior of OTA in the presence of NGQDs-Apt, it was possible to detect concentrations of OTA ranging from 10 to 5000nM, with a limit of detection of 2.28nM. Our method was tested by applying it to the detection of OTA in wheat and corn samples. This method has four advantages: (1) the magnetic porous carbon is easy to prepare, its porosity enhances its loading capacity for NGQDs, it highly efficiently quenches the fluorescence of the NGQDs, and its magnetic properties facilitate the separation of the MPC from other species in solution; (2) applying double magnetic separation decreases the background signal; (3) Exo I digests the free aptamer effectively, which allows the resulting free OTA to induce the release of more NGQDs-Apt, ultimately enhancing the fluorescent signal; and (4) the proposed method presented high sensitivity and a wide linear detection range. This method may prove helpful in food safety analysis and new biosensor development (achieved by using different aptamer sequences to that used in the present work). Graphical abstract Exonuclease I (Exo I)-assisted fluorescent method for ochratoxin A (OTA) detection using magnetic porous carbon (MPC), nitrogen-doped graphene quantum dots (NGQDs), and double magnetic separation.

MIL-53 (Fe) derived magnetic porous carbon as a robust adsorbent for the removal of phenolic compounds under the optimized conditions

The presence of phenolic compounds in aquatic environment, derived from industrial, domestic or agricultural processes adversely affects the human and animals. This study in aimed at the new and effectiveness of an adsorbent, magnetic porous carbon (MPC), for the removal of phenolic compounds including phenol and 4-nitrophenol from aquatic environment. MPC was synthesized from the metal-organic framework MIL-53 (Fe) via the direct pyrolysis at 600 °C. The MPC structure was characterized by several physical techniques and used for the adsorption experiments. To find the best conditions for the removal of phenol and 4-nitrophenol, we empirically investigated the effects of three variables (initial concentration, dosage and pH) on the removal efficiency using the response surface methodology (RSM). Under the RSM-based optimized conditions, up to 83% phenol was removed at the concentration of 16 mg/L, dosage of 0.7, and pH of 6.6, while the figure for 4-nitrophenol was 97%, at concentration of 26.0 mg/L, dosage of 0.75 g/L, and pH of 5.6. In addition, the nonlinear adsorption kinetics and isotherms were employed to interpret the mechanism and calculate the constants of adsorption rate. The uptake results suggested that the adsorption process was controlled by the chemisorption and the monolayer adsorption. The MPC exhibited the remarkable maximum adsorption capacities, which is 4 times (for phenol) and 5 times (for 4-nitrophenol) higher than those exhibited by origin MIL-53 (Fe). Plausible adsorption mechanisms were explained through dipole-dipole H-bonding, π–π interaction and electrostatic attraction. Because of high capacity, effortless performance and good reusability, the MIL-53 (Fe) derived porous carbon can be a promising material for phenolic species remediation in water.

Achieving superior electromagnetic wave absorbers through the novel metal-organic frameworks derived magnetic porous carbon nanorods

High absorption capacity and broad absorption bandwidth electromagnetic wave (EMW) absorption materials (namely, EMW absorbers) are highly desirable due to the interference with electronics and harms on human beings’ health. In search for rational design on nanostructured absorbers, we have synthesized and demonstrated the rod-shape composites with Fe-containing magnetic nanoparticles (Fe3O4, Fe3C and Fe NPs) embedded into nano-porous carbon (NPC) through pyrolysis of Fe-based metal-organic frameworks (MOFs). The morphologies, compositions, and graphitization degree of the Fe-MOFs derived magnetic NPC nanorods can be effectively controlled via adjusting the pyrolysis temperatures. The graphitization level has a significant influence on the permittivity of the composites upon variation of pyrolysis temperatures, thereby a tunable electromagnetic wave (EMW) absorption is observed. Consequently, the resulting magnetic NPC nanorods obtained at pyrolysis temperature of 600 and 700 °C exhibit the most remarkable EMW absorption performance with a strong reflection loss of −52.9 dB and broad effective bandwidth (fe) of 4.64 GHz at 3.07 mm. With a thickness of 3.5 mm, the fe for the magnetic NPC nanorods at 600 °C covers the whole X-band from 7.92 to 12.48 GHz. The noticeable EMW absorption performances have been greatly enhanced compared to those reported Fe3O4 based absorbers, owing to the synergy of multiple components and the porous structures inherited from MOFs.