Absorption Desorption Research Articles

Sustainable Processing of Ultralow-Cost Petroleum Cokes Into Ultrastable Self-Doped Fe3C@CNT Catalysts for High-Efficiency HER.

Petroleum cokes are largely used as low-cost anodes in aluminum industries and general fuels in cement industries, where large amounts of CO2 are generated. To reduce CO2 release, it is challenging to develop green strategies for processing abundant petroleum cokes into high-value products, because there are abundant hetero-atoms in petroleum cokes. To overcome such issues, a sustainable electrochemical approach is proposed to convert ultralow-cost high sulfur petroleum coke and iron powders into high-efficiency catalysts for hydrogen evolution reaction (HER). During molten-salt electrolysis, raw petroleum cokes are converted into CNTs via heteroatom removal and the catalytic effect of Fe, forming Fe3C nanoparticles on the sulfur and nitrogen co-dopped carbon nanotubes (Fe3C@S, N-CNTs). The electrochemical reaction analysis using the continuum model suggested that the rate-determining step referred to the slow transport of mobile ions inside the porous cathode. Because the self-doped S and N atoms massively alleviated the energy barrier for H* absorption and H2 desorption (i.e., promoting HER kinetics), the as-prepared Fe3C@S, N-CNTs exhibited low overpotentials at 10mAcm-2 in acidic (96mV) and alkaline (106mV) solutions with ultralong-term duration (200h). This study offers a sustainable approach to convert ultralow-cost petroleum cokes into ultrastable catalysts for high-efficiency HER.

Enhanced efficiency and selectivity of carbon monoxide absorption by cuprous-based bimetallic deep eutectic solvents via iron activation

The absorption/utilization of carbon monoxide (CO) is critical due to its wide application in chemical production processes (e.g., acylation), and its toxicity/environmental impact. However, traditional copper-ammonia solutions in industry have limitations such as the deactivation of copper ions and high viscosity, which hinder efficient CO absorption under atmospheric conditions. In this work, a series of low-viscosity bimetallic deep eutectic solvents (DESs) with high CO absorption capacity were developed by mixing metal chlorides with [Emim]Cl and CuCl in specific molar ratios. Comprehensive studies of their physical properties (density and viscosity) and CO absorption performance revealed that [Emim]Cl-CuCl-1.0FeCl3 exhibited the lowest viscosity (57.4 cP) and a nearly equimolar CO absorption capacity (0.9 mol/mol). Moreover, the selectivity for CO/N2 (730), CO/CO2 (22), and CO/H2 (52) at 298.2 K and 100 kPa was also satisfied. The data of Raman and FT-IR spectra demonstrated that FeCl3 effectively activated cuprous sites in CuCl and significantly enhanced the CO absorption performance of cuprous-based bimetallic DESs. Furthermore, [Emim]Cl-CuCl-1.0FeCl3 showed excellent reusability after six absorption–desorption cycles. Therefore, we believe that this work provides a route for the effective activation of cuprous sites in cuprous-based bimetallic DESs to achieve efficient and reversible CO absorption at atmospheric conditions.

CO2 absorption with polyethyleneimine solution intensified by a rotating packed bed with liquid detention

This study explored the absorption of CO2 by the polyethyleneimine (PEI) solution in a rotating packed bed (RPB). In order to boost the CO2 absorption effect, the liquid detention phenomenon in the RPB was utilized to overcome the short residence time of liquid. The effects of different operating parameters on CO2 absorption efficiency (η) and gas-phase volumetric mass transfer coefficient (KGav) in the RPB were investigated. The experimental results indicated that the RPB can greatly intensify the absorption of CO2. η and KGav increased from 3.3 % and 0.041 kmol·m−3·h−1·kPa−1 to 76.0 % and 1.634 kmol·m−3·h−1·kPa−1, respectively, as the rotational speed of the RPB rose from zero to 700 rpm with 250 mL detained liquid. It was also found that the liquid detention phenomenon can significantly elevate η and KGav as a result of extended liquid residence time and increased liquid holdup in the RPB. When the detained liquid volume increased from zero to 250 mL, η and KGav increased by 55.6 % and 113.1 %, respetively. In addition, it was observed that CO2 load in the rich PEI solution increased from 9.650 to 11.189 molCO2/kg PEI while η remained around 85 % after five cycles of absorption–desorption, suggesting an excellent cyclic stability of PEI. This work contributes to the development of viable CO2 capture technologies by intensifying the CO2 absorption process in the RPB with an efficient absorbent.

A novel ionic liquids phase change absorption system for carbon dioxide capture and utilization

In order to achieve low cost, and reduce energy consumption during regeneration, a novel ionic liquid phase change absorbent composed of tetraethylenepentamine [TEPA] imidazole [Im] and diethylene glycol dimethyl ether (DGME) and water was designed for CO2 capture applications. The absorbent [TEPAH][Im]+DM+H2O can achieves a CO2 absorption capacity of 2.08 mol CO2/mol ILs, the rich phase volume accounts for 15.6 vol%, and the mass fraction of CO2 is 99 %, this greatly reduces the regenerative volume of the absorption system, showing the potential of energy saving and emission reduction. After five absorption–desorption cycles, the regeneration efficiency of the system remained above 96 %. The CO2 capture mechanism was analyzed using both 13C NMR spectroscopy and density functional theory (DFT) calculations to elucidate its underlying processes. The cation [TEPAH]+ and the anion [Im]- each undergo a reaction with CO2 to produce carbamate, followed by hydrolysis of carbon dioxide to yield carbonate. The absorption system’s phase transition behavior primarily arises from variations in CO2 product solubility across solvents. Moreover, the ionic liquid facilitated the conversion of CO2 into quinazoline-2,4 (1H, 3H)-dione with a remarkable yield of 98 %. Even after five cycles, the ILs maintained substantial catalytic activity.

Study on Shipboard Carbon Capture Technology with the MEA-AMP-Mixed Absorbent Based on Ship Applicability Perspective.

Ocean-going ships powered by diesel engines were the main source of CO2 emissions in the marine environment, and it was imperative to study shipboard carbon capture technology. Based on this, the whole process of CO2 absorption and desorption was studied with a mixed amine (MEA + AMP). The effective cycle time, CO2 absorption capacity, desorption efficiency, energy consumption, foaming and volatilization characteristics, and other key parameters were compared and analyzed under the conditions of required capture efficiency by ships. The MEA20% + AMP10% solution showed good CO2 absorption performance. At 80% capture efficiency, the desorption efficiency was more than 50%. The absorption capacity was close to that of the MEA30% solution, and the cycle time was basically the same. The effective cycle time under the reaction time of 2 s was also determined, which was an important parameter for setting the desorption frequency and had a great effect on reducing the desorption energy consumption. This work can provide an important reference value for the real ship application of carbon capture devices.

Enhancing CO2 desorption efficiency with Non-Aqueous Catalyst-Enhanced Tri-Blend amines

The substantial energy demand of CO2-loaded solvent regeneration constitutes a significant economic challenge for the industrial applications of CO2 capture and utilization technologies. The nano-catalysts have the capability to improve CO2 desorption while reducing the energy demands for solvent regeneration. This study focuses on examining the absorption–desorption performance of non-aqueous tri-blend amines (monoethanolamine (MEA), methyl diethanol amine (MDEA), and piperazine (PZ)) utilizing different amounts of catalysts including HZSM-5, H-ferrierite (FER), and H-mordenite (MOR), γ-aluminium-oxide (Al2O3), titanium-oxide (TiO2), magnesium oxide (MgO), indium-oxide (In2O3). The incorporation of solid catalysts leads to a substantial enhancement in the desorption performance of tri-blend amines and reduced energy consumption in comparison to blank tests. Higher desorption efficiency occurred with the presence of lower catalyst amounts. The sequence of CO2 desorption heat duty performance reduction with 0.125 g catalyst, was as follows: MgO (70.9 %) > In2O3 (80.2 %) > HZSM-5 (84.1 %) > Al2O3 (84.2 %) > FER (87.1 %) > MOR (88.4 %) > TiO2 (89.7 %), relative to blank test (100 %). HZSM-5 exhibited the highest desorption factor as 4.25*10-7 mol3/kJmin while increasing the desorption rate to 2.37*10-3 mol/min. This study provides the desorption performance of non-aqueous amine blends with energy-efficient catalysts, highlighting their potential as promising materials for carbon capture and storage applications with improved energy efficiency.

Development of a high-pressure 700 bar metal hydride hydrogen compressor

HySA Systems and TF Design have recently developed a single-stage prototype high-pressure metal hydride hydrogen compressor (MHHC) which is able to compress hydrogen from 100 to >700 bar at the working temperatures from 20 to 150 °C, with estimated productivity about 1 Nm3/h. The MHHC comprises of two 2 m-long fibre-wound high-pressure MH containers developed by the authors earlier and assembled in two modules operating in a mode of a cyclic lower-pressure H2 absorption (on cooling) and high-pressure H2 desorption (on heating). The containers operate using a self-developed multicomponent C14 Laves type Ti–based AB2 intermetallic alloy. The article considers phase-structural and hydrogen sorption properties of the utilized metal hydride material, hydrogen compression performances of the metal hydride container, as well as layout and the expected performance characteristics of the compressor assembly.

Economic and environmental benefits of novel process of ionic liquids-based toluene absorption from exhaust gas at atmospheric pressure

The traditional toluene absorption process typically operates at high absorption pressure and desorption temperature, imposing a significant burden on the process. In this work, a novel process of atmospheric pressure toluene absorption using ionic liquids (ILs) is first proposed, which involves introducing a stripping column after the desorption unit to perform secondary purification of the circulating ILs, further decreasing the toluene content in ILs from 106–215 ppm to 5–13 ppm. Moreover, the novel process reduces the absorption pressure from 18 bar to 1 bar, and decreases the desorption temperature from 310 °C to approximately 150 °C. A comprehensive comparison of the traditional and novel process is carried out using nine ILs composed of imidazolium cations ([BMIM]+, [HMIM]+, [OMIM]+) and anions ([BF4]-, [PF6]-, [NTf2]-), considering both process economics and life cycle environmental impacts. The results indicate that in comparison to the traditional process using same ILs, the proposed novel processes exhibit superior economic performance and lower environmental impact, achieving savings of 68.9–76.9% in total annual cost and reducing global warming potential by 56.4–74.8%.

Experimental study on freeze-thaw resistance of mortar: An attempt to modify hydrophobic materials with hydrophobic nano-silica

In this study, a novel superhydrophobic additive (MPSANS) was developed to enhance the freeze-thaw (F-T) resistance of mortar by modifying mica powder with stearic acid and hydrophobic nano-silica. Firstly, the effects of hydrophobic nano-silica content on the hydrophobic properties of MPSANS modified mortar were studied, and MPSA10NS5 exhibited the best hydrophobic property, the water absorption and water desorption of modified mortar decreased by 65.42 % and 35.84 %, respectively. On this basis, abundant tests were conducted to analyze the effects of MPSA10NS5 content on the F-T resistance of mortar. Analytical findings suggested that MPSA10NS5 noticeably reduced the loss of relative dynamic modulus of elasticity and compressive strength of mortar. Furthermore, the microstructure was determined by using the scanning electron microscopy and mercury intrusion porosimetry. According to the test results, MPSA10NS5 refined the pore structure inside mortar and inhibited the crack development. Meanwhile, MPSA10NS5 effectively reduced the most probable aperture of mortar, resulting in an increase of harmless pores and a decrease of harmful pores.

A Novel Phase Change Absorbent for CO2 Capture with Low Viscosity and Effective Absorption–Desorption Properties

Excessive carbon dioxide (CO2) emissions can lead to environmental problems, and the use of phase change absorbents for CO2 capture has received much attention due to their excellent absorption and desorption properties. Herein, a novel liquid–liquid phase change absorbent consisting of N‐aminoethylpiperazine (AEP), diethylene glycol dimethyl ether (DEGDME), and H2O is utilized. Under the optimal absorption conditions, the absorption capacity is 1.23 mol CO2·mol−1 amine. The rich‐phase viscosity of the AEP/DEGDME/H2O solution is only 6.2 mPa s−1, and the rich phase‐to‐volume ratio is 52.7%, which is suitable for industrial applications. After five cycles of absorption–desorption experiments, the cyclic capacity reaches 0.62 mol CO2·mol−1 amine. However, it should be noted that this leads to an increase in the viscosity of the solution with time. The 13C Nuclear Magnetic Resonance characterization is used to analyze the material distribution and phase separation mechanism, and it is found that during the absorption process, the carbamate and carbonate products generated by the reaction of the amino group in the AEP with CO2 are mainly located in the rich phase, while the DEGDME and H2O mainly remain in the lean phase. In the desorption process, most of the absorbed products are decomposed, and the regeneration efficiency is 66.8%. Through the regeneration energy consumption experiment, when the regeneration efficiency is 56%–67%, the total regeneration energy consumption is 2.71–2.89 GJ t−1 CO2, which is 0.91–1.09 GJ t−1 CO2 lower than that of the regeneration efficiency of 30 wt% MEA solution at 63%, which indicates that this absorbent has certain energy‐saving advantages.

Effect of superabsorbent polymer on 3D printing characteristics as rheology-modified agent

This study aims to investigate the effects of two superabsorbent polymer (SAP) types, S1 and S2 (with continual absorption and rapid desorption, respectively) as rheology-modified agent on 3D printing characteristics. Three base mixtures were selected with different thixotropic behaviors (i.e., mixtures with high re-flocculation (τfloc), high structuration rate (Athix), and both low τfloc and Athix, respectively). The initial mini-slump flow of 190±10 mm was secured by adjusting superplasticizer (SP) or water demand (increasing w/b by either 0.025 or 0.05). An extrudable region was determined within the range of τfloc (200–890 Pa) and Athix (15–60 Pa/min). The use of the S2 SAP significantly improved extruded performance for mixtures with τfloc higher than 1000 Pa. The use of the S1 SAP without increasing w/b (only with extra SP demand) significantly improved the resistance against plastic collapse for the mixtures with τfloc lower than 300 Pa. The reduction in 28-day compressive strength for printed specimens was correlated with τfloc. A high τfloc value led to inadequate interlayer bond and an increased propensity for surface defects of printed structure. The S2 SAP acted as a rheology-modified agent to reduce τfloc and improved the interlayer bond performance by 10 %-20 %.

Precise construction of RuPt dual single-atomic sites to optimize oxygen electrocatalytic behaviors for high-performance Zn-air batteries

The development of redox bifunctional electrocatalysts with high performance, low cost, and long lifetimes is essential for achieving clean energy goals. This study proposed an atom capture strategy for anchoring dual single atoms (DSAs) in a zinc–zeolitic imidazolate framework (Zn–ZIF), followed by calcination under an N2 atmosphere to synthesize ruthenium–platinum DSAs supported on a nitrogen-doped carbon substrate (RuPt DSAs-NC). Theoretical calculations showed that the degree of Ru 5dxz − *O 2px orbital hybridization was high when *O was adsorbed at the Ru site, indicating enhanced covalent hybridization of metal sites and oxygen ligands, which benefited the adsorption of intermediate species. The presence of the RuPtN6 active center optimized the absorption–desorption behavior of intermediates, improving the electrocatalytic performance of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). RuPt DSAs-NC exhibited a 0.87 V high half-wave potential and a 268 mV low overpotential at 10 mA cm−2 in an alkaline environment. Furthermore, rechargeable zinc–air batteries (ZABs) achieved a peak power density of 171 mW cm−2. The RuPt DSAs-NC demonstrated long-term cycling for up to 500 h with superior round-trip efficiency. This study provided an effective structural design strategy to construct DSAs active sites for enhanced electrocatalytic performance.

Catalytic behavior of aluminum-modified SAPO-34 catalysts for reducing the energy penalty of CO2-rich amine solutions regeneration

The goal of this research is to develop a potential strategy to significantly decrease the heat duty for the amine-based CO2 capture process. Here, a variety of Al2O3-modified SAPO-34 composite catalysts with varying Al2O3 contents are synthesized and utilized to catalytically facilitate the CO2 desorption process. The catalytic CO2 desorption characteristics of various catalysts, Al-SAPO-34, SAPO-34, and γ-Al2O3 are investigated in a CO2-loaded 5 M monoethanolamine (MEA) solution. The results indicate that all catalysts accelerate CO2 desorption, while the Al-SAPO-34 catalysts work better than the parent Al2O3 and SAPO-34 catalysts. Especially, the 15 % Al-SAPO-34 increases the CO2 desorption rate by 78.4 % and reduces the relative energy requirement by 37 % at a desorption time of 1440 s. The catalysts are characterized by different methods and their structure–activity relationship is analyzed. The increased acid sites and mesoporous surface area of the Al-SAPO-34 catalyst may be responsible for its greater catalytic activity. The intermediates of the catalytic CO2 desorption process are identified by FT-IR and NMR, and then a possible catalytic regeneration mechanism is put forward. Additionally, the cyclic stability of the Al-SAPO-34 catalyst for cyclic CO2 absorption–desorption is evaluated. This work demonstrates that the Al-SAPO-34 exhibits greater catalytic CO2 desorption performance, and outstanding stability, and has the opportunity to become an attractive industrial catalyst for the amine-based CO2 capture process.

A new methodology for extra enhancement of hydrogen storage capacity of Mg–Ni based alloys: The role of gaseous O2/H2 mixture

In the present study, Mg–5Ni and Mg–15Ni alloys are prepared, and their (de)hydrogenation properties are investigated by thermal desorption spectroscopy (TDS). A new hydrogenation condition is developed to improve the hydrogen uptake properties of the Mg–Ni alloy. It is found that the hydrogen absorption and thermal desorption properties of both alloys are extremely sensitive to the presence of 3% O2 in the hydrogenation environment. Although O₂ accelerates hydrogen absorption, it lowers the desorption temperature and reduces the hydrogen storage capacity of the Mg–Ni alloy by consuming Mg₂Ni if it is added in every cycle. The hydrogen storage capacity of Mg–Ni alloys can be significantly increased by adding oxygen only in the second cycle instead of in all cycles. In the early stages of hydrogenation, only two TDS peaks are observed, while in later cycles a new peak appears at higher temperatures. These peaks correspond to the decomposition of Mg₂NiH₄ (peak 1), MgH₂ (peak 2), and the release of hydrogen from the bulk material (peak 3). It is also evident that the Mg–15Ni sample has a better hydrogen storage capacity than the Mg–5Ni sample.

A comprehensive model analysis of activity coefficients and thermodynamic properties of EAE-1DMA2P blended solvent

Solubility has an important influence on industrial applications of amine solvents. The CO2 equilibrium solubilities of EAE-1DMA2P solvents were obtained in 1:2, 1.5:1.5, and 2:1 ratios at 298–333 K and CO2 partial pressures of 8–100 kPa. Using these data, the accurate prediction of CO2 equilibrium solubility of EAE-1DMA2P solvent was achieved by constructing an activity coefficient model with an AARD of only 0.79%. In addition, by constructing the solubility prediction model of EAE-1DMA2P system based on an empirical model, KE model, Austgen model, Li-Shen model, Hu-Chakma model, Helei Liu model, and Liu et al. model the results were compared to confirm introduction of the activity coefficient has effectively improved the accuracy of the model prediction. Based on thermodynamic parameters of solubility, ΔrGm and ΔrHm, EAE-1DMA2P solvent was screened against other solvents. The results showed that EAE-1DMA2P solvent had excellent absorption, reaction rate and low desorption energy consumption, confirming its potential in CO2 capture.

Epoxy resin bioactive dental implant capped with hydroxyapatite and curcumin nanoparticles: a novel approach.

In this study, the developed bioactive dental implant (BDI) from epoxy resin (ER), hydroxyapatite (HA), and curcumin nanoparticles (CUNPs). The prepared BDI were characterized using their physicochemical, mechanical, antimicrobial, bioactive, and biocompatibility study. The scanning electron microscopy (SEM) morphology of the BDI was observed HA mineralized crystal layer after being immersed in the stimulated body fluids (SBF) solution. The mechanical properties of the BDI exhibited tensile strength (250.61 ± 0.43MPa), elongation at break (215.66 ± 0.87%), flexural modulus (03.90 ± 0.12 GPa), water absorption (05.68 ± 0.15%), and water desorption (06.42 ± 0.14%). The antimicrobial activity of BDI was observed in excellent zone of inhibition against the gram-negative (15.33 ± 0.04%) and gram- positive (15.98 ± 0.07%) bacteria. The biocompatibility study of BDI on osteoblasts cell line (MG-63) was analyzed using MTT (3-[4, 5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide) assay. The results were observed 85% viable cells present in the BDI compared to the control (only ER) samples. Based on the research outcome, the BDI could be used for biomaterials application, particularly tooth dental implantation.

Regenerated products from leather industrial solid waste: Future perspective and current advances

The removal of chrome waste (CW) has been identified as a significant environmental problem due to chromium's toxicity. This study tried to make a regenerated flexible sheet (RFS) with a leather alternative effect from chrome waste powder (CWP), cardboard waste fiber (CBWF), and protein binder (PB) fabricated by the hydraulic wet and hot press method. The prepared RFS was characterized by its High-resolution scanning electron microscopy (HR-SEM), thermo gravimetric analysis (TGA), mechanical analysis, and biodegradation properties. The result showed the strong binding achieved with fiber/polymer membrane for RFS. In this regard, RFS with suitable mechanical properties such as tensile strength (37.54 ± 1.32 MPa), elongation at break (33.64 ± 0.52 %), flexibility (5.34 ± 0.67 %), water absorption (27.74 ± 1.56 %), and water desorption (27.46 ± 0.76 %) properties. RFS possessed the required mechanical properties for leather sheet production and it was also biodegradable. The study proves that these composites could be successfully used for the production of cost-effective leather goods and footwear production. Production of useful byproducts from waste is income generating and at the same time reduces environmental pollution and a feasible technology for waste recycling has been proved in this study.

Flash spinning polyethylene/Fe3O4 magnetic drive fibers for oil absorption underwater

Oil pollution in water has destructive effect on the ecological environment of water bodies. However, the treatments for oil pollution underwater in irregularly shaped and non-open environments face a challenge owing to the difficulty in driving oil absorption materials underwater. Herein, this work reports a facile strategy to prepare flash spinning magnetic polyethylene fibers (FSMPFs) for oil absorption application in irregularly shaped and non-open underwater environments. The as-prepared FSMPFs exhibit good oil absorption performance, of which the oil absorption in air and underwater is 76.70 g/g and 65.32 g/g, respectively, and the FSMPFs can maintain their oil absorption performance in environments with different salinities (1–5 %) and pH values (2–12). Also, the FSMPFs show good magnetic responsiveness and controllability when applied to oil–water separation underwater in irregularly shaped pipes, and the oil–water separation efficiency of FSMPFs for oil–water emulsion reaches 99.6 %. Besides, the FSMPFs have good mechanical properties and reusability, of which the tensile strength and elongation at break is 185.9 cN and 41.2 %, respectively, and oil absorption is 76.28 g/g (99.5 % of the initial value) after 10 cycles of absorption–desorption. The FSMPFs have great potential in practical applications for oil absorption under irregularly shaped and non-open environments.

In–situ modification of UiO–66(Zr) organic ligand to synthesize highly recyclable solid acid for biodiesel production

To transfer high free fatty acid oil into biodiesel in mild conditions is still facing challenge, thereinto, the key is efficient acid catalyst. In this study, 2,5–dimercaptoterephthalic acid was adopted to substitute terephthalic acid as ligand for UiO–66–(SH)2 synthesis, then the sulfydryl (–SH) was in-situ oxidized by hydrogen peroxide and acidified via sulfuric acid thus generating sulfonic catalyst UiO–66–(SO3H)2. To further reveal the relationship between physico–chemical property and catalytic activity, catalyst was characterized via thermogravimetry analysis (TG), X–ray diffraction (XRD), N2 absorption–desorption, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and pyridine absorption–Fourier transform infrared spectroscopy (Py–FTIR). Results indicate the in–situ modification increases the quantity of acid sites for UiO–66(Zr), where the acidity is aggrandized from 0.02 mmol/g to 2.28 mmol/g. The maximum conversion of oleic acid to biodiesel was 86.52 % with catalyst amount of 10 wt% and molar ratio of methanol/oleic acid of 15 at 90 °C within 4 h. Moreover, UiO–66–(SO3H)2 exhibited favorable reusability and water resistance, which maintained an excellent esterification conversion after four cycles and no obvious impact was detected as the water content was 10 wt%. The quality of obtained biodiesel in this study satisfied the European Union standard of EN 14214, which could be used as transport fuel.

Dual-bioinspired and ultra-flexible photothermal eutectogels for highly efficient passive anti-freezing

Icing and frosting always cause troubles in present-day human activities, appealing for effective anti-freezing strategies to break through the bottleneck. Inspired by “predominant metabolites in the body fluid of cold-tolerant animals” and “poikilotherms that increase body temperature by absorbing solar energy”, natural deep eutectic solvents (NADES) and carbon nanotubes (CNTs) were incorporated within calcium alginate (CA) backbone to fabricate dual-bioinspired and ultra-flexible photothermal eutectogels (CNTs/NADES@CA). Normal CNTs (nCNTs) and hydroxylated CNTs (hCNTs) were used to investigate the effects of hydrogen-bonding networks of NADES on the dispersal/aggregation behaviours of nCNTs/hCNTs. Molecular dynamics (MD) simulation proved that hCNTs could form intense hydrogen-bonding interactions with NADES and disperse more uniformly, ultimately contributing to better mechanical properties. Spectral characteristics covering solar absorption and infrared emissivity showed that higher nanofiller loading could cause increased infrared emissivity, leading to more thermal energy loss during photothermal conversion. Besides, moisture absorption–desorption tests further confirmed the excellent function reproducibility and sustainability of the materials. One of the hCNTs-based eutectogels (4%-hCNTs) behaving the best in photothermal conversion was selected for anti-freezing tests concerning anti-frosting, anti-icing, and deicing capacities, announcing that the CNTs/NADES@CA could be highly efficient for passive anti-freezing. This study proposed a highly efficient nanofiller dispersion strategy enabled by NADES to fabricate ultra-flexible photothermal eutectogel by a physically simple method, and it is hoped that this work could open up new avenues for bioinspired materials and attract more concerns for the proposed dual-bioinspired anti-freezing strategy.