Vacuum Filtration Research Articles

Wearable, Biodegradable, and Antibacterial Multifunctional Ti3C2Tx MXene/Cellulose Paper for Electromagnetic Interference Shielding and Passive and Active Dual-Thermal Management

An energy-saving scheme that can simultaneously realize electromagnetic interference (EMI) shielding, passive solar radiative heating, and active Joule heating in a single wearable device is still a huge challenge. Here, by combining the unique properties of Ti3C2Tx MXene and biocompatible cellulose nanofibers (CNFs), a flexible, degradable, and antibacterial multifunctional Ti3C2Tx/CNF paper (∼0.6 Ω/sq) is constructed through a facile vacuum filtration strategy. The resultant device not only exhibits an admirable EMI shielding effectiveness of ∼48.5 dB at the X-band and a superior heating property including dual-driven electrothermal and photothermal conversion without energy but also possesses wide temperature range regulation and long-time stability. More impressively, both high antibacterial efficiency (toward both gram-positive and gram-negative bacteria) and good degradability with low-concentration hydrogen peroxide solution can also be achieved in Ti3C2Tx/CNF papers. This study provides a promising platform for practical applications of multifunctional Ti3C2Tx/CNFs in EMI shielding, thermotherapy, heat preservation, and antibacterial protection in harsh environments, satisfying the demands for energy-saving, environmentally friendly, and sustainable development.

Conductive and antibacterial films by loading reduced graphene oxide/silver nanoparticles on cellulose nanofiber films

The development of sustainable high-performance materials based on nanocellulose has received great attention in recent years. Herein, nanocellulose based composite films with highly electro-conductive and antibacterial properties have been developed by loading reduced graphene oxide (rGO)/silver nanoparticles (AgNPs) on cellulose nanofiber films via vacuum filtration process. The reduction effect of gallic acid on the chemical structure and electrical conductivity of rGO/AgNP composites was studied. Due to the strong reducibility of gallic acid, the obtained rGO/AgNPs exhibited a high electrical conductivity of 1549.2 S·m−1. Furthermore, the electrical conductivity, mechanical properties and antibacterial properties of the prepared rGO/AgNP-cellulose nanofiber films as a function of various proportions were investigated. The prepared composite film with a specific ratio of rGO/AgNPs to cellulose nanofibers as 7:3 exhibited the superior tensile strength of 28.0 MPa and the electrical conductivity of 1199.3 S·m−1. Meanwhile, compared with pure cellulose nanofiber films, rGO/AgNP-cellulose nanofiber films displayed strong antibacterial effect against Escherichia coli and Staphylococcus aureus. Therefore, this work demonstrated an effective approach for imparting structural and functional properties to cellulose nanofiber based films, which could hold great application prospects for flexible and wearable electronics.

Study on the evaporation characteristics of Ag@Fe3O4 nanoparticle film interface

In order to collect solar energy into vapor more efficiently, Ag@Fe3O4 nanoparticles with good photothermal properties were prepared in this study, and nanoparticle films were prepared by vacuum filtration of nanofluids to load nanoparticles on filter membrane, which exhibit good evaporation performance. The effects of fluid depth, nanoparticle loading surface density and light intensity on the evaporation performance were investigated. The experiments showed that the evaporation performance is the best at a light intensity of 2 sun, a surface density of 1.0 g/m2 and a fluid depth of 30 mm (evaporation efficiency of 0.599 and heat efficiency of 0.824). In addition, the surface density is not conducive to the increase of water temperature when it exceeds a certain range. The increase of nanoparticle film surface density is mainly beneficial to evaporation rather than heat storage.

Enhancing thermal stability of polycarbonate films with one‐sided coating of graphene oxide

AbstractIn this study, polycarbonate (PC) films were coated with a thin layer of graphene oxide (GO) or its reduced form (rGO) via vacuum filtration. The effects of the coating on PC were studied by means of modulated differential scanning calorimetry (mDSC), thermogravimetric analysis (TGA), and scanning electron microscopy. As shown by mDSC, there was no significant change in glass transition temperature (Tg), indicating little molecular interaction between the PC and the coating. In addition, GO and rGO showed poorer thermal stability than the neat PC, which is consistent with the literature. Despite these findings, both GO‐ and rGO‐coated PC films exhibited significantly higher onset thermal degradation temperatures than the neat PC. Moreover, when the rGO loading was below a certain level, the coated PC films demonstrated a comprehensive enhancement in thermal stability over the entire temperature range of TGA measurement. Such enhancement could be observed even at very low rGO loadings when the surface of the PC film was partially coated.

Mechanically strong and multifunctional nano-nickel aerogels based epoxy composites for ultra-high electromagnetic interference shielding and thermal management

With the development of highly integrated electronic equipment, electromagnetic pollution and heat congregation have become serious problems. Electromagnetic interference (EMI) shielding materials with high thermal conductivity and mechanical properties are highly desirable. Herein, the reduced graphene oxide/Ni nanowire aerogels (GNiA) were firstly prepared via hydrothermal reducing process and freeze-drying. Subsequently, using epoxy (EP) as a polymer matrix, the GNiA/EP composites with high compression strength of 147 MPa were fabricated by vacuum filtration and curing. The GNiA endows the composites with great electromagnetic wave loss, as well as improved phonon propagation efficiency, resulting in the super high EMI SE. With the GNiA content of 12.14 wt%, the EMI SE and thermal conductivity of GNiA/EP composites can reach as high as 85 dB and 1.69 W/(m·K) respectively. The obtained GNiA/EP composites provide a strategy to meet the demand for electronic equipment for new-generation EMI shielding materials.

Unraveling the control of reversibility for actuators based on cellulose nanofibers

In this work, we have prepared cellulose-based actuators taking advantage of the pH-sensitive solubility of chitosan (CH) and the mechanical strength of CNFs. Bilayer films were prepared by vacuum filtration inspired by plant structures that exhibit reversible deformation under pH changes. The presence of CH in one of the layers led to asymmetric swelling at low pH, thanks to the electrostatic repulsion between charged amino groups of CH, and the subsequent twisting with the CH layer on the outside. Reversibility was achieved by substituting pristine CNFs with carboxymethylated CNFs (CMCNFs), that are charged at high pH and thus competed with the effects of amino groups. Swelling and mechanical properties of layers under pH changes were studied by gravimetry and dynamic mechanical analysis (DMA) to quantify the contribution of chitosan and the modified CNFs on the reversibility control. This work evidenced the key role of surface charge and layer stiffness to achieve reversibility. Bending was triggered by the different water uptake of each layer, and shape recovery was achieved when the shrunk layer shower higher rigidity than the swollen layer.

Highly Stable Potassium Metal Anodes with Controllable Thickness and Area Capacity.

K metal battery is a kind of high-energy-density storage device with economic advantages. However, due to the dendrite growth and difficult processing characteristics, it is difficult to prepare stable K metal anode with thin thickness and fixed area capacity, which severely limits its development. In this work, a multi-functional 3D skeleton (rGCA) is synthesized by simple vacuum filtration and thermal reduction, and K metal anodes with controllable thickness and area capacity (K content) can be fabricated by changing the raw material mass and graphene layer spacing of rGCA. Moreover, the graphene sheet layer of rGCA can relax stress and relieve volume expansion; carbon nanotubes can serve as the fast transport channel of electrons, reducing internal impedance and local current density; Ag nanoparticles can induce the uniform nucleation and deposition of K+ . The K metal composite anodes (rGCA-K) based on the conductive skeleton can effectively suppress dendrites and exhibit excellent electrochemical performance in symmetric and full cells. The controllable fabrication process of stable K metal anode is expected to help K metal batteries move toward the stage of commercial production.

Role of alkane-[formula omitted],[formula omitted]-diamine in the nanostructure of carboxylic functionalized multiwalled carbon nanotubes grafted on amino-enriched nylon fabric toward metal ion absorption

Through a direct two-step functionalization reaction with alkane-α,ω-diamine (H2N(CH2)nNH2, n = 2, 4, 6, 8) and carboxylic functionalized multi-walled carbon nanotubes (MWCNT-COOH), the membrane labeled as C@(A[n]-nylon), is made up of nylon 6 fabric and intermediate amino-enriched nylon (A[n]-nylon) fabric. FTIR and Raman spectra confirm the efficient formation of amide bonds between the two amino heads of the alkane-α,ω-diamine, both with hydrolyzed nylon 6 and MWCNT-COOH. As a result, MWNCT-COOH were grafted to the nylon fiber side wall without causing damage to the nylon backbone. The SEM images confirm the plexus of MWCNT covering the amino-enriched nylon fibers. The long carbon chain of alkane-α,ω-diamine as an arm help amino groups reach beyond the surface of polyamide fiber, making it easier for -COOH groups of MWCNT-COOH to form amide bonds instead of being ejected when approaching CO groups on the polyamide surface. As-prepared C@(A8-nylon) membranes have metal ion rejection of more than 10% in vacuum filtration test with solution of M(CH3COO)2 (M = Ca, Co, Pb). Such membrane is long lasting for about 20 cycles, showing potential of turning polyamide fabrics with large pore sizes into highly efficient nanofiltration of reverse osmosis (RO) membranes. This unique structure opens up new possibilities for nanocomposite membranes and mass production by the proposed simple method.

Micro/nano-plastic removal from wastewater using cellulose membrane: Performance and life cycle assessment

Globally, micro- and nano-plastics (MNPs) have become a serious environmental threat due to significant pollutions caused by their multitude sources, widespread distribution, persistence, and adverse effects to ecosystem. Although MNPs can act as carriers of heavy metal ions, associated effort on simultaneous separation of MNPs and heavy metal ions is still in their infancy. Herein, we report a simple and green strategy that can simultaneously separate MNPs and heavy metal ions using cellulose membranes. The process takes advantage of vacuum filtration and in situ crosslinking using bacterial cellulose (BC) and attapulgite (APT). The purification efficiency of bacterial cellulose membrane (BAM) for MNPs is higher than 98 % and the adsorption efficiency for heavy metal ion is 97 %. The BAM also exhibits high tolerance on different aquatic conditions (strong acidic, saline and alkaline water) and adaptation to different sizes of MNPs. Life cycle assessment (LCA) is performed to evaluate the overall environmental impact for the bifunctional BAM, showing a low overall impact under 14 categories, which exceeds other filtering membranes on the aspect of environmental friendliness. This study opens an avenue for valorization of bacterial cellulose membranes on water remediation through efficient and simple separation of various types of plastic particles and heavy metal ions.

Transparent nanopaper from nanofibrillated bamboo pulp

Bamboo pulp was used to produce modified cellulose nanofiber (M-CNF) with 3,4-dichlorophenyl isocyanate through a one-step mechano-chemical method by ball milling. The structural variations of bamboo cellulose with different degrees of substitution (DS) for hydroxyl groups were studied by FTIR, XRD, TEM, AFM, and elemental analysis. The DS was as high as 0.88 after just 2 h of ball milling, and the diameter of M-CNF was 2 to 3 nm after just 1 h of ball milling. The modified nanocellulose was hydrophobic, with a water contact angle as high as 87°. The nanopaper made from the nanocellulose by vacuum filtration was transparent, with an optical transparence up to 88.8% at 550 nm. However, the transmittance of the modified nanopaper decreased to nearly 0 over the wavelength range of 200 to 300 nm. This nanopaper can be used as flexible optoelectronic material, packing material, or ultraviolet shielding material.

Bio-functional collagen/casein/chitosan scaffolds regulated porous TFC membrane for acid recovery

Applications of environmentally friendly and low-cost biomaterials for membrane preparation offer unparalleled advantages over traditional synthetic polymer membrane. Herein, a novel collagen/casein/chitosan composite material was designed to synthesize TFC membrane for acid recovery from acidic waste stream. A vacuum filtration method was used to precious adjust the thickness of the functional layer while glutaraldehyde was adopted as crosslinking agent to preserve surface charge property of anion-exchange membranes (AEM) at acidic conditions. The electrostatic interactions and hydrogen bonding of these biopolymers endowed the TFC membrane with enhanced stability. At optimized conditions with 0.15 mL collagen/casein/chitosan composites decoration, the TFC membrane with a functional layer thickness of around 628.4 nm exhibited an excellent acid permeance (UH+ = 0.034 m h−1) and a high H+/ Fe2+ separation factor up to 33.8. This facile strategy provides a useful guideline for constructing highly efficient TFC membrane for acid recovery and broadens the application of biomaterials for membrane application at harsh environments.

Manipulation of nano-metals to implement rational conduction tailoring for high-efficiency microwave absorption

Conduction tailoring (CTs) of dielectric absorbers has already been regarded an effective strategy to realize the controllable electromagnetic (EM) wave response. However, there is still lacking of elaborate understanding of the relationship between the design of CTs and microscopic properties, as well as how they relate to EM wave absorption. Here, reduction graphene oxide-based CTs is developed by nano-metal intercalation into RGO lamella via additive-assisted vacuum filtration assembly technique and in-situ metal reduction technique. After the integration of micro-/macro-evolution of composition and structure, cross-scale analog computation, and EM patterns/power loss analysis, for the first time the implementing mechanisms of CTs on the improvement of EM wave absorption properties have been acquired. Benefiting from the balance between the energy capture and EM energy transformation, effective frequency bandwidth of 6.9 GHz at 2.2 mm and 5.2 GHz at 1.8 mm can be achieved after the CTs design by silver and copper. Meanwhile, the optimum RCS reduction values reach 2.29 dB m2 when the detection theta was set as 20°. This work systematically explores the CTs-based relation chains of charges-composition-models-EM patterns, which is of great importance for the optimization of effective operating bandwidth and reflection loss properties.

Two-Dimensional Interlayer Space Induced Horizontal Transformation of Metal-Organic Framework Nanosheets for Highly Permeable Nanofiltration Membranes.

Laminar membranes comprising graphene oxide (GO) and metal-organic framework (MOF) nanosheets benefit from the regular in-plane pores of MOF nanosheets and thus can support rapid water transport. However, the restacking and agglomeration of MOF nanosheets during typical vacuum filtration disturb the stacking of GO sheets, thus deteriorating the membrane selectivity. Therefore, to fabricate highly permeable MOF nanosheets/reduced GO (rGO) membranes, a two-step method is applied. First, using a facile solvothermal method, ZnO nanoparticles are introduced into the rGO laminate to stabilize and enlarge the interlayer spacing. Subsequently, the ZnO/rGO membrane is immersed in a solution of tetrakis(4-carboxyphenyl)porphyrin (H2 TCPP) to realize in situ transformation of ZnO into Zn-TCPP in the confined interlayer space of rGO. By optimizing the transformation time and mass loading of ZnO, the obtained Zn-TCPP/rGO laminar membrane exhibits preferential orientation of Zn-TCPP, which reduces the pathway tortuosity for small molecules. As a result, the composite membrane achieves a high water permeance of 19.0Lm-2 h-1 bar-1 and high anionic dye rejection (>99% for methyl blue).

Hydrophilic imprinted MnO2 nanowires “coating” membrane with ultrahigh adsorption capacity for highly selective separation of Artemisinin/Artemether

The selective separation and purification of ART and ARE using molecularly imprinted membrane (MIM) has attracted considerable attention, but most of conventional blending MIM face low adsorption capacity and poor selectivity due to the blockage of imprinting sites. Herein, an alternative ART imprinted MnO2 nanowires “coating” membrane (MINM) withhydrophilicity was fabricated by vacuum filtration of imprinted MnO2 nanowires and graphene oxide nanosheets on PVDF membrane surface for selective ART separation. For the MINM, the imprinted MnO2 nanowires coating offers more available exposed imprinting sites on the MINM surface compared to that of the blending MIM, while the introduction of graphene oxide improves the hydrophilicity of MINM, significantly reducing the non-specific absorption. Consequently, the MINM exhibits ultrahigh ART adsorption capacity and selectivity, with the ART adsorption amount of 335 mg g−1 at 5 min using dynamic cross-flow separation system, about 12.18 times higher than that of ARE (27.5 mg g−1), and the separation factor (a) value of 12.39. Moreover, the ATR FT-IR dynamic spectrum discloses the in-situ formation of H-bond between ART and MINM, playing a key role in the selective adsorption process. This work provides an alternative strategy to prepare “coating” MIM for high-efficient and selective separation of complex analogue systems.

Scalable aqueous-phase fabrication of reduced graphene oxide nanofiltration membranes by an integrated roll-to-roll (R2R) process

Economic fractionation of multicomponent biomass-derived streams is a key challenge in biobased fuels and chemicals production. Kraft black liquor (BL) is generated at ∼1 billion tons/yr globally from biomass pulping and contains ∼15 wt% total solids including lignin, hemicellulose fragments, and inorganics. Membrane-based BL concentration is attractive but challenged by low solute rejections and poor stability in BL, which combines alkaline pH (∼13), high dissolved solids content (15+ wt%) and high temperature (70–85 °C). Here we discuss the scaled fabrication and characterization of reduced graphene oxide (rGO) nanofiltration membranes by slot die coating on a roll-to-roll (R2R) with integrated vacuum filtration. We obtain high-quality 90 × 30 cm rGO membranes (referred to as “R2R-rGO membranes” in this work) with ∼100 nm average thickness supported on porous poly(ethersulfone) (PES) sheets, and an effective area of 2700 cm2. We present characterizations of their microstructure and uniformity as mapped over large areas by scanning electron microscopy (SEM), ellipsometry, adhesion test and X-ray photoelectron spectroscopy (XPS). The constructed ellipsometry model for the rGO membrane/PES substrate composite was successfully applied to 48 different locations of the R2R-rGO membranes. The R2R-rGO membranes showed >98% lignin rejection with a steady state flux of ∼12 LMH at 50 bar in a 15.7 wt% total solids (TS) kraft BL stream at 72 °C and 2–3 gal/min crossflow rates. Slot die coating on a R2R platform with integrated vacuum filtration can enable rapid fabrication of high-quality GO membranes at scale without organic solvents or volatile organic compounds.

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

With the problem of electromagnetic interference (EMI) increasingly serious, the development of lightweight and flexible electromagnetic shielding composite films with excellent Joule heating performance and good mechanical properties is of great significance for modern electronic devices. In this study, we prepared aramid nanofiber/aramid nanofiber-poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/polydopamine-modified reduced graphene oxide (ANF/APP/PRGO) composite films with excellent electromagnetic shielding properties and electrical heating properties by stepwise vacuum filtration. With high conductivity (124.10 S/cm) and multi-interface electromagnetic wave reflection caused by the layered structure, the composite films achieve an EMI shielding effectiveness (SE) as high as 40.52 dB at 8.2–12.4 GHz (X-band) with a low thickness (∼22 μm). At the same time, the composite films also exhibit excellent electrical heating performance with fast response and cycle stability, which can reach a surface saturation temperature as high as 127.6 °C under an applied voltage of 7 V. Therefore, it can be envisaged that the ANF/APP/PRGO composite films have certain practical application value in the fields of electromagnetic shielding and electric heating.

Sb2Te3 nanoparticle-containing single-walled carbon nanotube films coated with Sb2Te3 electrodeposited layers for thermoelectric applications

Single-walled carbon nanotubes (SWCNTs) are promising thermoelectric materials owing to their flexibility and excellent durability when exposed to heat and chemicals. Thus, they are expected to be used in power supplies for various sensors. However, their thermoelectric performances are inferior to those of inorganic thermoelectric materials. To improve the thermoelectric performance while maintaining the excellent characteristics of SWCNTs, a novel approach to form inorganic thermoelectric layers on the SWCNT bundle surfaces using electrodeposition is proposed. We synthesized Sb2Te3 nanoparticle-containing SWCNT films and coated them with electrodeposited Sb2Te3 layers. The Sb2Te3 nanoparticles were synthesized via a spontaneous redox reaction, which were then added to a SWCNT dispersion solution, and films were produced via vacuum filtration. At higher nanoparticle contents in the films, the Sb2Te3 electrodeposited layers completely covered the SWCNT bundles owing to the increase in the concentration of precursor ions near the SWCNT bundle surface, which in turn was the result of melted nanoparticles. The thermoelectric performance improved, and the maximum power factor at approximately 25 °C was 59.5 µW/(m K2), which was 4.7 times higher than that of the normal SWCNT film. These findings provide valuable insights for designing and fabricating high-performance flexible thermoelectric materials.

Multidimensional nano-graphite constructed TiB2–SiC–B4C composite ceramics with the integration of mechanical and electromagnetic properties

The goal of this study is to create structure-functional integrated ceramic matrix composites with high structural strength and electromagnetic absorbing properties. The multidimensional nano-graphite (1-Dimensional rod-like nano-graphite, 0-Dimensional dispersive nano-graphite, and 2-Dimensional lamellar nano-graphite) were employed to construct TiB2–SiC–B4C composites via high-energy ball milling, vacuum filtration, and reactive SPS sintering. The microstructure of multidimensional nano-graphite was investigated using XRD and HRTEM and determined to be a crystal-amorphous coexisting. Furthermore, solid solution reaction and interfacial evolution are confirmed as the primary influence on the microstructure of TiB2–SiC–B4C composite. A significant improvement occurs on the flexural strength (647.6 MPa) and bending toughness (5.1 MPa m1/2). Meanwhile, the multi-dimensional nano-graphite gives the TiB2–SiC–B4C composite the loss ability of electromagnetic waves, and the matching thickness of the 10 vol% sample is 2.4 mm and the absorption range is 10.4–11.3 GHz.

Thiol-rich and ion-imprinted alginate hydrogel as a highly adsorptive and recyclable filtration membrane for rapid and selective Sr(II) removal

Radionuclides such as strontium 90, 90Sr, pose severe threats to the environment and humans since the wide application of nuclear power plants around the world. In the environment, rapid remediation of Sr2+ contaminated water still remains challenging. The current study developed an economical biomaterial-based hydrogel adsorbent with excellent Sr2+ adsorption performance achieved by ion-imprinting and abundant thiol groups, which was adaptable as an adsorptive filtration membrane for efficient and rapid purification of Sr2+ polluted water.The hydrogel was synthesized via a three-step route based on sodium alginate (SA). First, SA was emulsified and converted via Sr2+ complexation to hydrogel (SA-Sr); secondly, a thiol-rich carboxyethyl grafted pentaerythritol tetrakis (thioglycolic acid) ester (PA) synthesized by click chemistry was used to covalently crosslink the hydrogel (SA-PA-Sr) with abundant thiol groups simultaneously introduced and lastly, a Sr2+-imprinted adsorbent (SA-PA-H) was obtained via acid elution of the SA-PA-Sr hydrogel.The SA-PA-H demonstrated superior Sr2+adsorption capacity (∼151.7 mg/g), rapid adsorption kinetics following pseudo-second order, with a rate constant of 0.669 g mg−1 min−1, and selectivity for Sr2+, a value ∼ 1.14 × 103 mL g−1 when adsorbing 10 ppm Sr2+ from concentrated (100 ppm) solutions of competitive ions (Na+ or Mg2+). The performance was maintained over a wide pH range (4–10) and temperatures (25–40 °C). The adsorption mechanism was attributed to the prevalent Sr2+ bindings to thiol groups and Sr2+imprinted cavities.Moreover, SA-PA-H showed high elasticity with a storage shear modulus ∼ 10 kPa at low strains, and rapid and full self-recovery after being repeatedly damaged by large strains . This allowed the SA-PA-H to be adapted as a membrane for vacuum filtration, giving a high removal efficiency (>99.2%) of Sr2+ under a high liquid flux (∼40 L m-2h−1). In addition, the adsorbent could be regenerated by acid washing and after four consecutive adsorption–desorption cycles, the drop in removal efficiency was minor (53.51% to 36.88% for 100 ppm Sr2+). This investigation demonstrated a novel hydrogel adsorbent advantageous in cost, performance, processability and sustainability, being applicable for the rapid and complete decontamination of nuclear wastewater via adsorptive membrane filtration.

Thermal stability of Ni3ZnC0.7: As tunable additive for biomass-derived carbon sheet composites with efficient microwave absorption

With the rapidly development of radar detection technology and the increasingly complex application environment in military field and electromagnetic pollution surrounded by electron devices, increasingly demand is needed for electromagnetic wave absorbent materials with high absorption efficiency and thermal stability. Herein, a novel Ni3ZnC0.7/Ni loaded puffed-rice derived carbon (RNZC) composites are successfully prepared by vacuum filtration of metal-organic frameworks gel precursor together with layered porous-structure carbon and followed by calcination. The Ni3ZnC0.7 particles uniformly decorate on the surface and pores of puffed-rice derived carbon. The puffed-rice derived carbon@Ni3ZnC0.7/Ni-400 mg (RNZC-4) sample displayed the best electromagnetic wave absorption (EMA) performances among the samples with different Ni3ZnC0.7 loading. The minimum reflection loss (RLmin) of the RNZC-4 composite reaches −39.9 dB at 8.6 GHz, while widest effective absorption bandwidth (EAB) of RNZC-4 for RL < −10 dB can reach 9.9 GHz (8.1–18 GHz, 1.49 mm). High porosity and large specific surface area promote the multiple reflection-absorption effect of the incident electromagnetic waves. The Ni3ZnC0.7 nanoparticles provide a large number of interfaces and dipole factors. Analysis reveals that the RNZC-4 remained general stability under 400 °C with formation of a small amount of NiO and ZnO phases. Surprisingly, at such high temperature, the absorbing properties of the material are improved rather than decreased. Obviously, the material still maintains good electromagnetic wave performance at high temperature, and implies that the absorber shows good performance stability. Therefore, our preparations exhibit potential applications under extreme conditions and a new insight for the design and application of bimetallic carbides.