Fe2O3 Ratio Research Articles

Effect of surfactants on the stability, rheological properties, and thermal conductivity of Fe3O4 nanofluids

Stability is the major factor that enables the application of nanofluids in energy conversion systems. Excellent rheological and thermal conductivity is the key for nanofluids to be an ideal heat transfer medium. In this work, we investigated the stability of Fe3O4 nanofluids by four characterization techniques, mainly from the viewpoint of surfactant type and mass ratio, and systematically studied its rheological and thermal conductivity properties by different experimental methods and analyzed the behavior of magnetic fluid thermal anisotropy by mathematical methods. The experimental results show that the surfactant Tetramethylammonium hydroxide (TMAH) has the best stability effect and can keep the Fe3O4 nanofluids more than 120 h. And the best ratio is when the mass ratio of Fe3O4 to TMAH is 1:4. The surfactant Polyvinylpyrrolidone (PVP) has the greatest effect on nanofluids viscosity. The increase in TMAH mass leads to a Newtonian fluid behavior of the nanofluids at low temperatures and low shear rates, besides shifting its shear thinning towards the high temperature region. However, from the curve relationship between the shear rate and shear stress, the Fe3O4 nanofluids belongs to the expansion fluid among non-Newtonian fluids. The surfactant Sodium dodecyl sulfate (SDS) have the greatest effect on the thermal conductivity of Fe3O4 nanofluids. Theoretical calculations show that as the concentration increases, the rate of heat transfer in the direction of the parallel magnetic field is significantly greater than in the direction of the perpendicular magnetic field, while the rate of heat transfer in the absence of a magnetic field is somewhere in between.

Effect of Fe2O3–TiO2-Sm2O3 composite additive on sintering behavior and thermal properties of Al2O3 ceramics for thermal storage

Al2O3 ceramics were prepared by introducing Fe2O3–TiO2-Sm2O3 composite additive, in which the content and ratios of Fe2O3 and TiO2 remained constant, but Sm2O3 was variable. The phase transformation, micromorphology, physical properties and thermal properties were investigated. The results showed that Fe2O3 and TiO2 made the grains high sintering activity through a solid solution mechanism, which promoted grain growth, but Sm2O3 preferred to form SmFe4Al8O19 at the grain boundaries, which slowed grain growth and refined the grains. With the increase in Sm2O3, the grain refinement of SmFe4Al8O19 became outstanding, and the grain diameter gradually decreased, which is favorable for denser sintering. However, only a proper amount of Sm2O3 in the Fe2O3–TiO2-Sm2O3 composite additive resulted in better thermal shock resistance. The Al2O3 ceramics with 9 wt% Fe2O3-1 wt% TiO2-5 wt% Sm2O3 sintered at 1520 °C exhibited the optimum properties, yielding an increase in the bending strength by 6.60% after 30 thermal shocks, a thermal conductivity of 13.33–5.64 W/(m·K) (25–800 °C) and a specific heat capacity of 0.94–1.25 J/(g·K) (25–800 °C), all of which demonstrate the potential for thermal storage.

Efficient extraction and separation of zinc and iron from electric arc furnace dust by roasting with FeSO4·7H2O followed by water leaching

Electric arc furnace dust (EAFD) formed during steelmaking in electric arc furnace is rich in iron and zinc. Due to the negative effects of zinc, directly recycling as raw materials for ironmaking does not work so that it is still mostly accumulated. In this study, a novel process was proposed, wherein EAFD was roasted with FeSO4·7H2O followed by water leaching for the effective and selective extraction and separation of zinc and iron from EAFD. The optimal roasting conditions were determined as mass ratio of FeSO4·7H2O/EAFD of 1.5, roasting temperature of 675 °C, holding time of 3 h. The transfer mechanism of elements in EAFD was analyzed. 98.79% of zinc and only 0.11% of iron were dissolved in the leaching solution, respectively, avoiding the iron-removing step before the subsequent zinc electrodeposition. Meanwhile, most of Ca, Mg and Mn ions transformed into corresponding sulfates during roasting experiments and then entered leaching solution after water leaching. Thus, the leaching residue with 91.36% mass ratio of Fe2O3 could be applied as raw material for ironmaking industry. In addition, the majority of heavy metals (Pb and Cr) were remained and immobilized in the leaching residue, meeting the requirement of leaching toxicity standard. Results from this work provide a new insight into selective recovery of valuable metals from EAFD while at the same time exploiting the solid waste of Copperas.

The effect of aluminosilicate in anionic–nonionic surfactant mixture on wetness and interfacial tension in its application for enhanced oil recovery

In particular, this study aims to investigate the effect of aluminosilicate nanoparticle in the mixture of anionic (Sulfonated Alkyl Ester) and nonionic (Fatty Ester Oleate) surfactants on the interfacial tension and wettability related to EOR processes. Various experiments were conducted such as measuring interfacial tension between oil and brine using spinning drop tensiometer, measuring contact angle between surfactant-NPs-brine solution and Buff Berea core using optical tensiometer, conducting spontaneous imbibition, and core flooding tests.It is observed that the more anionic surfactant in the mixture the more significant aluminosilicate reduces contact angle and increases interfacial tension (IFT), which promotes contradicting effect on oil recovery. In this study, the IFT prevails and eventually reduces ultimate oil recovery. At spontaneous imbibition tests the ultimate oil recovery is decreased from 58% to 47% and from 63% to 46% for SAE-01A and SAE-01B, respectively. The ultimate oil recovery is reduced from 54% to 35% and from 50% to 39% at core flooding tests (Figure 16) for SAE-01A and SAE-01B, respectively. The aluminosilicate nanoparticle contributes positively as the ratio of SAE and FEO becomes smaller. At surfactant formulation ratio of 1:2 (SAE-01C), the IFT is decreased slightly from 4.36 x 10−3 mN/m to 2.36 x 10−3 mN/m and contact angle is also slightly reduced from 41.9° to 40.3° by adding 250 ppm NPs. The results show that ultimate oil recovery is increased 52% to 61% and from 47% to 49% at spontaneous imbibition tests and core flooding tests, respectively.

Optimized conditions for reduction of iron (III) oxide into metallic form under hydrogen atmosphere: A thermodynamic approach

Incomplete reduction of Fe2O3(s) iron oxide into metallic Fe(s), under hydrogen, is a challenge for iron-based catalysts limiting their industrialization for methane reforming or decomposition. This work provides thermodynamic models generated using the HSC 7.1 Chemistry software, based on minimization of total Gibbs free energy and provides amount of species resulting from the reduction of iron oxide under hydrogen. Molar ratios of Fe2O3 to H2(g) were varied from stoichiometric till hydrogen excess. An optimum molar ratio for highest reduction degree of iron oxides into metal was defined. Results show that direct reduction of Fe2O3(s) into Fe(s) is not possible, but a series of H2-induced reduction steps along with other side-reactions take place yielding, partially reduced iron oxides species. An optimized Fe2O3:H2 molar ratio exceeding 0.25:3 is needed to favor reduction of FeO(s) into Fe(s)0. For validation, simulated values were compared with experimental ones from literature (reduced amounts of iron oxide).

Variation of gas composition and energy utilization in biomass CLG process with Fe and Ca oxides through thermodynamic simulation

Chemical looping gasification (CLG) proves to be effective route for biomass thermal conversion for quality gas production. Fe2O3 and CaO were applied in sawdust thermal decomposition as oxygen carrier and CO2 absorption agent to improve syngas composition and yield. The CLG process was investigated based on experiment and process model simulation. Process model was developed based on thermodynamic equilibrium and kinetics of 22 representative reforming reactions in CLG, with the model applicability validated with experimental results. The effect of Fe2O3 and CaO addition on CLG process, including product distribution, gas composition, energy balance and exergy efficiency, was analyzed through extensive simulation under varied combination of reaction temperature(773 ∼ 1273 K), blending ratio of Fe2O3 (0 ∼ 2) and CaO (0 ∼ 2) conditions in order to clarify the effect of variables. Especially the interaction between Fe2O3 and CaO addition on process performance was discussed to discover the potential synergetic effect on mechanism. The blending of Fe2O3 or CaO changed the gas composition with improved oxidation and reforming reactions. Optimum syngas production with maximum H2 and CO yield 682 mL/g was achieved at 1073 K CLG process. And the blending ratio of oxidant was an important factor influencing the energy balance and exergy efficiency, with the equivalent point between CLG reaction heat and char combustion heat appeared at 0.4–0.45 Fe2O3 addition. The results achieved from process simulation would be informative for CLG process mechanism understanding and efficient syngas conversion.

The impact of Fe2O3 on the dispersion parameters and gamma/fast neutron shielding characteristics of lithium borosilicate glasses

50.4B2O3 – 30SiO2 – (19.6−x) Li2O – x Fe2O3, x = (0 ≤ x ≤ 2 mol%) glasses are studied for optical, and radiation characteristics. XRD was used to determine the structural characteristics of the proposed glasses. The chief objective of this article is to fabricate high density samples with replacing Li2O with Fe2O3 to investigate the optics and radiation characteristics. Density, and refractive index of fabricated glasses have all been found to be higher. As the concentration of Fe2O3 rises, energy bandgap reduces. The radiation shielding characteristics were examined using Phy-X/PSD. Increases in the Fe2O3 ratio have a positive impact on MAC values. These results reveal G 5 as the best candidate for shielding against gamma radiation.

Modification of Cathode Material Lithium Iron Phosphate by Silicon Doping Using Solid State Reaction

Lithium iron phosphate (LiFePO4) based material is one of the most prospective candidates as a cathode material in lithium-ion batteries because of its lower cost, safer, and environmental benignity compared to lithium cobalt oxide (LiCoO2), which is commonly used for lithium-ion batteries manufacturing. However, its low conductivity is the obstacle of this material to solve, so that modification with the addition of silicon (Si) is expected to improve the electrochemical performance. Meanwhile, solid state reaction is considered simple and effective in LiFePO4 crystal growth process. Therefore, Si-doped LiFePO4 using solid state reaction in this research aims to study its structure and morphology as well as the effect of adding Si to its conductivity. The synthesis began with mixing LiH2PO4, Fe2O3, carbon black, and six-mole ratio variation of Si to LiFePO4 using agate with ethanol: acetone addition then dried in an oven at 80°C and heated at 550°C in a furnace for 6 hours under argon atmosphere and sintering temperature of 870°C for 16 hours with the same condition. The sample of 3% mole ratio performed the highest conductivity of all variations with 3.01 x 10-6 S.cm-1, and was identified as Li0.93Fe1.07P0.93O4Si0.7 with orthorhombic structure, Pnma space group (Ref. Code: ICSD 98-016-1792) with the highest peak at 2θ = 35.556° from XRD analysis with rectangular-like shape particle.

Synthesis of Fe3O4@mZrO2-Re (Re = Y/La/Ce) by Using Uniform Design, Surface Response Methodology, and Orthogonal Design & Its Application for As3+ and As5+ Removal.

In this study, iron oxide (Fe3O4) was coated with ZrO2, and doped with three rare earth elements((Y/La/Ce), and a multi-staged rare earth doped zirconia adsorbent was prepared by using uniform design U14, Response Surface methodology, and orthogonal design, to remove As3+ and As5+ from the aqueous solution. Based on the results of TEM, EDS, XRD, FTIR, and N2-adsorption desorption test, the best molar ratio of Fe3O4:TMAOH:Zirconium butoxide:Y:La:Ce was selected as 1:12:11:1:0.02:0.08. The specific surface area and porosity was 263 m2/g, and 0.156 cm3/g, respectively. The isothermal curves and fitting equation parameters show that Langmuir model, and Redlich Peterson model fitted well. As per calculations of the Langmuir model, the highest adsorption capacities for As3+ and As5+ ions were recorded as 68.33 mg/g, 84.23 mg/g, respectively. The fitting curves and equations of the kinetic models favors the quasi second order kinetic model. Material regeneration was very effective, and even in the last cycle the regeneration capacities of both As3+ and As5+ were 75.15%, and 77.59%, respectively. Adsorption and regeneration results suggest that adsorbent has easy synthesis method, and reusable, so it can be used as a potential adsorbent for the removal of arsenic from aqueous solution.

Preparation and Characterization of PU/PET Matrix Gradient Composites with Microwave-Absorbing Function

In the field of microwave-absorbing materials, functional powder has always been the focus of research. In order to fabricate lightweight and flexible garment materials with microwave-absorbing function, the current work was carried out. Firstly, the general properties of polyurethane (PU) matrix composites reinforced with various microwave-absorbing powders were studied, and the carbon nanotubes (CNTs)/Fe3O4/PU film was proven to have the best general properties. Secondly, the needle-punched polyester (PET) nonwoven fabrics in 1 mm-thickness were impregnated into PU resin with the same composition of raw material as Fe3O4/CNTs/PU film, thereby the microwave-absorbing nonwovens with gradient structure were prepared. Moreover, the absorbing properties of the CNTs/Fe3O4/PU/PET gradient composites were tested and analyzed. Finally, the relationship between the mass ratio of CNTs and Fe3O4, and the microwave-absorbing properties was studied. The results show that the mass ratio of CNTs/Fe3O4 has a significant effect on the microwave-absorbing property of CNTs/Fe3O4/PU/PET. When the mass ratio of CNTs/Fe3O4 is 1:1, the prepared CNTs/Fe3O4/PU/PET gradient composite can achieve effective reflection loss in the range of more than 2 GHz in Ku-band (12–18 GHz), and the minimum reflection loss reaches −17.19 dB.

Performance evolution of Fe3O4 used in the production of sustainable self-healing asphalt materials

Studies have shown that the sustainable self-healing ability of asphalt materials under microwave radiation is related to the microwave absorption of the constituent materials. As a typical absorbing material, Fe3O4 and its derivatives have the potential to heal the micro cracks of asphalt materials multiple times by themselves, and enhance the sustainable self-healing properties. However, former researchers have neglected the fact that Fe3O4 will be gradually oxidized at high temperatures, such as 100 °C, resulting in the changes in material properties, microwave absorption and heat-generating capability. Therefore, the effects of different temperatures on the properties of controllable synthesized Fe3O4 were studied at 125 °C (mixing temperature of WMA), 150 °C (mixing temperature of HMA), 175 °C (mixing temperature of HMA with modified binder) and 200 °C (extreme mixing temperature). The phase compositions, chemical structure of synthesized Fe3O4 were characterized firstly. Then, their electromagnetic parameters, reflection loss were studied at a microwave frequency ranging from 1 to 18 GHz. Additionally, heat-generating abilities of them were characterized at usual microwave frequency of 2.45 GHz. Finally, the effects of different content of Fe3O4 on the rheological properties of pure asphalt were studied. The results show that the proportion of γ-Fe2O3 in the samples gradually increase with exposure temperature, and the static magnetic properties gradually deteriorate. The reflection loss of the modified asphalt decreases firstly and then increases. The F-150 modified asphalt has the strongest microwave absorption capacity. Under the 2.45 GHz microwave radiation, the F-150 modified asphalt presents the strongest heat-generating capability and is consistent with the results of reflection loss. It can be seen that the ratio of γ-Fe2O3 and Fe3O4 in F-150 has the best attenuation effect on microwave radiation, and Fe3O4 is more suitable as microwave absorber for self-healing enhancement of HMA.

Preparation and Thermal Conductivity of Epoxy Resin/Graphene-Fe3O4 Composites.

By modifying the bonding of graphene (GR) and Fe3O4, a stable structure of GR-Fe3O4, namely magnetic GR, was obtained. Under the induction of a magnetic field, it can be orientated in an epoxy resin (EP) matrix, thus preparing EP/GR-Fe3O4 composites. The effects of the content of GR and the degree of orientation on the thermal conductivity of the composites were investigated, and the most suitable Fe3O4 load on GR was obtained. When the mass ratio of GR and Fe3O4 was 2:1, the thermal conductivity could be increased by 54.8% compared with that of pure EP. Meanwhile, EP/GR-Fe3O4 composites had a better thermal stability, dynamic thermomechanical properties, and excellent electrical insulation properties, which can meet the requirements of electronic packaging materials.

Experimental Study on Influence of Al2O3, CaO and SiO2 on Preparation of Zinc Ferrite

Gossan ore of sulfide zinc deposit contains abundant zinc, iron, and other metal elements, which is a significant resource with complex components and can be utilized. In this study, a new technology of preparing zinc ferrite from zinc sulfide deposit gossan was proposed. The effects of Al2O3, CaO, and SiO2 in gossan on the formation of zinc ferrite were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and specific surface area and pore size analysis (BET). The results show that the presence of Al2O3 and CaO could hinder the formation of zinc ferrite, while silica had no effect on the formation of zinc ferrite. Under the conditions of the molar ratio of ZnO and Fe2O3 to Al2O3, CaO, and SiO2 of 1:1:1, an activation time of 60 min, and a roasting temperature of 750 °C for 120 min, the products, which had good crystallinity, smooth particle surface, and uniform particle size could be obtained. In addition, compared to the roasted products with Al2O3 and CaO, the specific surface area, pore volume, and pore size of the products with SiO2 were the largest.

Application of calcium oxide/ferric oxide composite oxygen carrier for corn straw chemical looping gasification

Biomass chemical looping gasification (CLG) technology is an important utilization form of renewable energy. In order to obtain high-quality syngas, CaO/Fe2O3 was used as a composite oxygen carrier for biomass CLG in this study. The CLG experiment of corn straw and the study of oxygen carrier recycling were carried out, simultaneously, the reaction mechanism was further discussed. Results shown adding CaO to oxygen carrier could significantly improve the quality of syngas through increasing the H2 and reduce Greenhouse gas (CO2 and CH4, about 14% reduction). Besides, the ratio of Fe2O3 to CaO, steam to biomass, and oxygen carrier to biomass all affected the syngas composition (the H2/CO variation from 1.82 to 2.19), while the temperature had obvious influence on the gas yield of CLG. The most possible reaction mechanism shown that the variation of Ca might be the main factor of gas composition fluctuation.

Inhibiting effects by Fe2O3 on combustion and explosion characteristics of ABS resin

The global increase in the use of, and reliance on, plastics has prompted the demand for acrylonitrile-butadiene-styrene (ABS) resin in various fields. With this increased requirement, numerous failures have occurred in the ABS process. Those incidents, resulting from electrostatic discharge, powder accumulation, heat accumulation, construction sparks, and plant fires, have caused dust fire and explosions.In this study, the ABS resin was gleaned from the site and tested for its explosion parameters, including minimum ignition temperature of dust cloud (MITC), minimum ignition energy (MIE), and minimum explosion concentration (MEC). To improve loss prevention in the manufacturing process, ferric oxide (Fe2O3) as an inert additive was added in the ABS powder. According to the MIE test, Fe2O3 has an apparent inhibiting effect on dust explosion for the ABS dust. With the proportion of Fe2O3 increased from 25 to 50 mass% in ABS, the MIE increased from 67 to 540 mJ. The explosion tests via 20-L apparatus indicated that Fe2O3 mixed with ABS could not increase the MEC significantly. However, the explosion pressure dropped by increasing in the ratio of Fe2O3 in ABS. This inerting strategy of ABS was deemed to substantially lessen the probability and severity of fire and explosion.

Density functional theory of transition metal oxide (FeO, CuO and MnO) adsorbed on TiO2 surface

Titanium dioxide (TiO2) is widely used as a catalyst due to its high redox activity. To explore the metal oxide-TiO2 supported interactions and their effects, the electronic structure, adsorption energies and physical properties of different metal oxides (FeO, CuO and MnO) adsorbed anatase TiO2 (101) surface have been studied by means of density functional theory (DFT) calculations, compared with that on pure TiO2 surface. On the basis of the study, three different kinds of adsorption ratio among the metal oxides mentioned above (single metal oxide adsorption model, different metal oxide adsorption models with 2:2 ratio and 1:3 ratio), as a whole, 12 models were investigated to study the influence of different proportion of metal oxide adsorbed in the TiO2 carrier in order to find the best metal oxide adsorption ratio. The calculated results show that the different adsorption ratios of metal oxides have influences on the reactivity of catalysts. A small amount of CuO will increase the reactivity of the catalyst, but the overall catalytic effect of the catalyst containing CuO is not comparable to those only containing FeO or MnO. In terms of the structural stability of catalysts, the catalysts containing FeO are more stable than those only containing CuO and MnO, and the more FeO adsorption ratio, the more stable the catalyst structure will be. The results of binding energy and bandgap show that the structure of the 1:3 adsorption model is more stable than the other two models, and the mixed adsorption leads to the reduction of bandgap. The order of influence is 1:3 ratio adsorption model >2:2 ratio adsorption model > single metal oxide adsorption model.

Self-assembly of superstructures at all scales

Summary Controllable assembly of molecular and nanoscale building blocks into uniform superstructures up to bulk dimensions remains a key challenge in the next phase of nanotechnology development. Here, we report the self-assembly of superstructures at all scales by taking advantage of the partial miscibility of water and 1-butanol to generate transient aqueous emulsion droplets that can encapsulate the target materials and introduce them into template holes. Further diffusion of water into 1-butanol depletes the emulsion droplets, assembling the building blocks into one well-defined superstructure in each hole. Superstructuring of various types and shapes of nanoparticles, biomolecules, and inorganic compounds could be achieved without the need for surfactants and chemical modifications. The versatility, scalability, low-cost, and accurate positioning are crucial advantages for the future development of advanced precision manufacturing.

Ampicillin adsorption onto amine-functionalized magnetic graphene oxide: synthesis, characterization and removal mechanism

There are various chemical, physical and biological methods that have been applied to remove antibiotic residuals from aqueous environment. We investigated the removal of ampicillin (AMP) by a novel nanometer-size Fe3O4/graphene oxide/aminopropyltrimethoxysilane (FGOA). Based on the sol-gel method, the graphene oxide (GO) was first modified by aminopropyltrimethoxysilane (APTMS) to form GOA material containing both acidic and basic surface functional groups. The nanomagnetic iron oxide was then decorated to the GOA surface at various weight ratios by ultra-sonication in ethanol, resulting in different FGOA samples. The as-synthesized FGOA had single-layer structure and parallel array-like well-distributed Fe3O4. In laboratory-scale, the AMP treatment efficiency by FGOA with the ratio of Fe3O4: GOA as 1:5 ratio reached the highest value around 94% within 100 min and only lost 1% after five regeneration cycles. The maximum adsorption capacity of FGOA was 294mg g−1, significantly much higher than the previously published materials applied to AMP uptake. Interestingly, the optimum pH of FGOA ranged extensively from 4 to 9, revealing high application potential to real wastewater without any pH adjustment. The reasonable mechanism might be mainly attributed to electrostatic attraction, hydrophilic, and π-π interaction.

Nanostructured Fe2O3/TiO2 composite particles with enhanced NIR reflectance for application to LiDAR detectable cool pigments.

Nanostructured Fe2O3/TiO2 composite pigments with improved NIR reflectance were prepared by a homogeneous precipitation method using urea and NH4OH. The optical and morphological properties of the resulting pigment were investigated by varying the weight ratio of Fe2O3 to TiO2 and the calcination temperature. The resulting composite pigment has a nanostructure in which Fe2O3 nanoparticles of 20–30 nm size are well coated on the surface of TiO2 (∼100 nm) and the reflectance is greatly improved in the wavelength range of 620–1350 nm. The ratio of Fe2O3 to TiO2 and the calcination temperature were optimized to provide both high NIR reflectance and red color, which were 0.1 and 700 °C. As a result, compared with pure Fe2O3 (Eg = 2.06 eV, a* = 22.6), the optimized Fe2O3/TiO2 composite pigment (Eg = 2.09 eV, a* = 24.8) showed similar color properties and improved NIR reflectance by about 23.8%. In addition, the Fe2O3/TiO2 composite pigment showed about 62.7% larger reflectance at 905 nm than Fe2O3. According to a temperature rise test under IR illumination, the Fe2O3/TiO2 composite pigment was confirmed to have improved heat shielding properties. Therefore, the nanostructured Fe2O3/TiO2 powder could be potentially applied as a LiDAR detectable cool red pigment for autonomous vehicles.

Synthesis of a hollow-structured flower-like Fe3O4@MoS2 composite and its microwave-absorption properties.

In order to realize the characteristics of new types of wave-absorbing materials, such as strong absorption, broad bandwidth, low weight and small thickness, a hollow-structured flower-like Fe3O4@MoS2 composite was successfully prepared by simple solvothermal and hydrothermal methods in this paper. The structural properties were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Besides, the microwave properties and magnetic properties were measured using a vector network analyzer and via a hysteresis loop. SEM and TEM images revealed that MoS2 nanosheets grew on the surface of hollow nanospheres. The results showed that the composite exhibited excellent absorbing property. When the molar ratio of Fe3O4 and MoS2 was 1 : 18, the minimum reflection loss value reached −49.6 dB at 13.2 GHz with a thickness of 2.0 mm and the effective absorption bandwidth was 4.24 GHz (11.68–15.92 GHz). Meanwhile, the effective absorption in the entire X-band (8–12 GHz) and part of the C-band (4–8 GHz) and Ku-band (12–18 GHz) could be achieved by designing the sample thickness. In addition, the hollow structure effectively reduced the density of the material, which was in line with the current development trend of absorption materials. It could be predicted that the hollow core–shell structure composite has a potential application prospect in the field of microwave absorption.