查找使用阿拉丁产品的科研文献

Physicochemical Properties of Ethylene Glycol-Based Deep Eutectic Solvents for CO2 Capture

Minjie Gao,Congfei Zhu,Yasen Dai,Bingru Wang,Shuhang Ren,Weize Wu

Deep eutectic solvents (DESs) show great potential in the field of CO2 capture; however, the lack of systematic physicochemical property data remains a bottleneck constraining their rational design and industrial application. This study prepared six representative DESs and systematically characterized their key fundamental properties as absorbents: density, viscosity, thermal stability, and specific heat capacity. The results indicate that the chemical structure of the hydrogen bond acceptor has a decisive influence on the properties of the DESs. The viscosity and density of all DESs decreased significantly with increasing temperature. Thermogravimetric analysis revealed their varying thermal stabilities, with the onset decomposition temperature ranging from 366.52 K (menthol–ethylene glycol) to 415.17 K (choline chloride–ethylene glycol). The measurement of specific heat capacity data provides a key basis for evaluating solvent regeneration energy consumption. This study fills the gap in systematic property data of various DESs. Comprehensive analysis indicates that the choline chloride-ethylene glycol system achieves the best balance among viscosity, thermal stability, and specific heat capacity, making it a highly promising candidate based on its physicochemical property profile for CO2 capture among the studied systems. This work provides solid data support and theoretical guidance for the screening, design, and energy optimization of DESs in CO2 capture processes.

Polyethylene glycol mediated ZIF-8 encapsulation of catalase for enhanced catalytic activities

Hailong Guo,Jian Lu,Jianlong Zhang,Zhibin Feng,Shujie Liang

The limited recovery and high sensitivity of free enzymes to aggressive environments constrain their use in industrial processes. Metal-organic frameworks offer a promising protective matrix, with zeolitic imidazolate framework-8 (ZIF-8) widely studied as an enzyme immobilization carrier. However, enzyme deactivation frequently occurs due to the harsh synthetic conditions, which collectively compromise the structural integrity and catalytic activity of the biomacromolecule. In this paper, a one-pot synthesis strategy was employed to prepare polyethylene glycol (PEG)-mediated ZIF-8 immobilized catalase (CAT). Structural and morphological analyses using XRD, SEM, BET, and other techniques confirmed the successful encapsulation of CAT within the MOF matrix. The introduction of PEG as a surfactant significantly enhanced the stability and catalytic efficiency of CAT, resulting in an increased Michaelis constant (K M , 2.28 mM) and maximum reaction rate (V max , 33.81 μM/s). This study provides an effective approach to improve enzyme performance through MOF-based immobilization, offering valuable insights for advancing biocatalysis in industrial applications.

Polyethylene glycol/wood-derived porous carbon composites for solar–thermal energy storage

Zijiao Guo,Fankai Lin,Qianchao Ma,Mengyao Yang,Xianjie Liu,Mingyong Liu,Yue'na Jiang,Xin Min,Zhaohui Huang

To address the high cost, low thermal conductivity, and limited solar-thermal conversion efficiency of conventional composite phase change materials, this study develops a wood-derived composite phase change material based on polyethylene glycol and a wood-derived porous carbon skeleton. Wood chips and phenolic resin were used as carbon sources to fabricate an integrated porous carbon framework through dry pressing and carbonization, and polyethylene glycol was subsequently incorporated as the phase change component. The phenolic resin promoted the formation of a continuous and mechanically stable carbon skeleton, resulting in a thermal conductivity of 0.57 W/(m·K), approximately three times that of pure polyethylene glycol, and a compressive strength of 0.85 MPa. As a further enhancement, silicon carbide nanowires were generated in situ by introducing silicon powder into the carbon skeleton. The nanowires improved heat-transfer pathways and regulated the pore structure, increasing the thermal conductivity to 1.13 W/(m·K) while enabling a polyethylene glycol loading of 62%. The resulting composite exhibited good shape stability during phase transition, which were attributed to the capillary confinement and interfacial interactions provided by the porous carbon framework. In addition, the combined effects of the biomass-derived carbon skeleton and silicon carbide nanowires contributed to a solar–thermal conversion efficiency of 78.7%. These results demonstrate that wood-derived porous carbon can serve as a low-cost and effective supporting framework for polyethylene glycol, while the in-situ-formed silicon carbide nanowires provide an additional route for improving heat transfer and solar–thermal conversion. This study offers a practical strategy for developing biomass-based composite phase change materials with favorable thermal storage, mechanical, and solar-thermal conversion performance.

Advantages of ethylene glycol diacetate as a potential solvent for herbicide formulations

Menghan Li,Longfei Jin,Bin Liu,Yifang Qian,Haofu Hu,Xin Wang,Yang Zhang,Wenping Xu

Emulsifiable concentrates and oil suspensions are typical pesticide formulations. Many pesticides on the market use aromatic hydrocarbons as solvents. However, studies have revealed their potential risks to humans and the environment. Ethylene glycol diacetate (EGDA) is a low-toxicity and eco-friendly solvent with low utilization in pesticides. This study explores EGDA’s potential to replace xylene. Results indicate that EGDA formulations enhance droplet adhesion to leaves, boosting pesticide efficiency. They exhibit lower surface tension and contact angles, with a 24%–40% increase in leaf retention. Bioassays show that 15% cyhalofop-butyl EC and 10% nicosulfuron OF with EGDA offer weed control that is superior to xylene-based formulations by 9.1%–30.5% in greenhouses and 4.8%–6.7% in fields. Xylene preparations are 2–3 times more cytotoxic to human bronchial cells than EGDA-based ones. Thus, EGDA is a promising pesticide solvent, outperforming traditional aromatic solvents in environmental friendliness and reducing adverse effects.

Multiarm-polyethylene glycol-polyglutamic acid peptide dendrimer: Design, synthesis, and dissolving thrombus

Shao-Fei Zhang,Shaoyu Lü,Chunmei Gao,Jiandong Yang,Xiang Yan,Tao Li,Na Wen,Mengjie Huang,Mingzhu Liu

Thrombotic events affect many individuals in a number of ways, all of which can cause significant morbidity and mortality. Nattokinase (NK), as a novel thrombolytic drug, has been used for thrombolytic therapy. It not only possesses plasminogen activator activity, but also directly digests fibrin through limited proteolysis. However, it may undergo inactivation and denaturation in the harsh external environment. In this study, a multiarm-polyethylene glycol-polyglutamic acid peptide dendrimer was fabricated and used as a carrier for NK protection and delivery. Different arm numbers of polyethylene glycol-polyglutamic acid peptide dendrimers ( x -PEG(G 3 ) x , x = 2, 4, 6, 8) were designed, prepared, and characterized by 1 H NMR and FTIR. Then, x -PEG(G 3 ) x were loaded with NK to form nanocomposites. Their size and morphology were determined by dynamic light scattering and transmission electron microscopy. Enzyme activity was evaluated via UV–Vis absorbance spectra, fluorescence spectra, circular dichroism spectra, and zeta potential measurements. The study reveals that the obtained x -PEG(G 3 ) x /NK nanocomposites possess high enzyme activity. In addition, the nanocomposites show increased viability of rat macrophage cells, and excellent thrombolysis ability in vitro and in vivo . This work establishes a multiarm-polyethylene glycol-polyglutamic acid peptide dendrimer with potential application in NK carrier and thrombolytic therapy. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1687–1696, 2018.

Fabrication of dopamine modified polylactide-poly(ethylene glycol) scaffolds with adjustable properties

Jiali Shen,Dongjian Shi,Chang Shi,Xiaojie Li,Mingqing Chen

Carbon Dioxide Absorption by Polyethylene Glycol Dimethyl Ether Modified by 2-methylimidazole

Yan Wu,Zicheng Wang,Hui Yu,Bin Ding,Ke Fei,Xueli Ma,Baoshen Xu,Yonghu Zhang,Xiaoning Fu,Bowen Ding,Nan Li

Developing and utilizing capture and storage technologies for CO2has become a critical research topic due to the significant greenhouse effect caused by excessive CO2emissions. A conventional physical absorption process for CO2capture is polyethylene glycol dimethyl ether (NHD); however, its limited application range is caused by its poor absorption of CO2at low pressures. In this work, the CO2absorption of NHD was enhanced by combining NHD with a novel chemical absorbent 2-methylimidazole (2-mIm)-ethylene glycol (EG) solution to improve CO2absorption. Viscosity and CO2solubility were examined in various compositions. The CO2solubility in the mixed solution was found to be at maximum when the mass fractions of NHD, 2-mIm, and EG were 20%, 40%, and 40%, respectively. In comparison to pure NHD, the solubility of CO2in this mixed solution at 30 °C and 0.5 MPa increased by 161.2%, and the desorption heat was less than 30 kJ/mol. The complex solution exhibits high selectivity and favorable regeneration performance in the short term. However, it is more sensitive to moisture content. The results of this study can provide important data to support the construction of new low-energy solvent systems and the development of novel CO2capture processes.

Catalytic conversion of cellulose to ethylene glycol using functionalized covalent organic frameworks

Yu Zhao,Yuan Ju,Baozhen Guo,Peng Gan,Pengfei Lv,Jingli Yang,Chengcheng Qiao,Kai Zhang

The utilization of abundant and renewable cellulose as an alternative to fossil resources provides a promising pathway for the sustainable production of bio-based chemicals. The development of multifunctional catalysts is key to achieving the efficient conversion of cellulose into high value-added chemicals. In this study, a combination of in situ and post-synthetic strategies was employed to synthesize functionalized covalent organic frameworks (COFs). Using aldehyde monomers containing phenolic hydroxyl groups and amine monomers with triazine structure as raw materials, COFs (TATP) rich in acidic active sites were successfully synthesized via the solvothermal method. Subsequently, a multifunctional catalyst (Ru-WOx/TATP) capable of catalyzing hydrolysis, hydrogenolysis, and hydrogenation reactions was developed by loading active metals ruthenium (Ru) and tungsten (W). Finally, this catalyst was applied to the research on one-step catalytic conversion of cellulose to ethylene glycol (EG). The results showed that Ru–WOx/TATP exhibited good crystallinity and thermal stability, and showed excellent catalytic performance and high selectivity for EG in the one-pot aqueous-phase conversion of cellulose. Under the optimal reaction conditions of 245 °C, an initial hydrogen pressure of 5 MPa, a substrate concentration of 1%, and a reaction time of 3 h, complete cellulose conversion was achieved, with an ethylene glycol yield of up to 62.9%. This work innovatively developed a functionalized COF with catalytic capabilities for hydrolysis, hydrogenolysis, and hydrogenation, and applied it to the catalytic conversion of cellulose into EG, thereby expanding the application scope of COFs in biomass catalysis.

Polyethylene glycol/carboxymethyl cellulose/montmorillonite composite phase change materials for thermal management

Hangyu Hu,Chaoming Wang,Shuaiao Xie,Lei Zhang,Junjie Liu,Xiangyu Li

The fabrication of composite phase change materials (CPCMs) with excellent shape stability, reasonable thermal conductivity and good mechanical properties using simple process to obtain an effective energy storage and conversion maintains an issue of the utmost importance. In this work, carboxymethylcellulose sodium (CMC)/montmorillonite (MMT) aerogels with various MMT loading is initially prepared by gelation and freeze-drying technique. The prepared CMC/MMT aerogels have a uniformly distributed pore structure, of which the compressive strength can reach 26.4 kPa when the MMT loading content is 40 wt%. When the MMT loading content is 40 wt%, the thermal conductivity of the PEG/CMC/40MMT CPCM can reach up to 0.78 W/m·K, which is 225 % higher than that of pure PEG. In particular, the rigid CMC/MMT composite aerogel is conducive to the storage of PEG, obtaining a maximum loading percentage of 96.8 %, phase change enthalpy of 179.2 J/g, and high enthalpy efficiency of 98.6 % for CMC/40MMT aerogel. The rigid supporting matrix and adsorption capacity of the CMC/MMT framework meliorate the shape stability and cyclic stability during the phase transition, which can also cool the surface temperature of a simulated central processing unit (CPU) from 90 °C to 54.7 °C. In summary, the as-prepared novel PEG/CMC/40MMT CPCM offers a novel strategy for thermal management of next-generation electronic devices.

Solubility and crystallization kinetics of NH4Cl in Water-Ethylene glycol binary systems

Ya-Yuan Zheng,Ting M. A.,Huai-Ming D. U.

Ammonium chloride (NH 4 CI) finds extensive applications across numerous sectors such as chemicals, pharmaceuticals, and agriculture, necessitating enhancement in the quality of crystal products and precision in designing the NH 4 CI crystallization process. In this paper, we conducted an investigation into the solubility and supersolubility of NH 4 CI in H 2 O-Ethylene Glycol(EG) binary system with various proportions via dynamic laser method. We utilized the Apelblat model, Van’t Hoff model, and Redlich-Kister model to correlate the experimental findings, and derived thermodynamic parameters through these correlations. Further, we determined the solid-liquid surface tension and crystal surface entropy factor of NH 4 CI in the system using the Mersmann equation and Barata equation, thereby providing essential input for understanding crystallization kinetics. Afterward, we meticulously examined the crystallization kinetics of NH₄Cl in the H₂O-EG solvent by utilizing the batch dynamic approach. We established equations that correlated the rates of crystal nucleation and growth obtained through regression analysis. Additionally, we explored in - depth the effects of supersaturation and suspension density on the crystallization kinetics of NH₄Cl. Our results reveal that the dissolution of NH 4 CI in the binary solvent system under different proportions takes place as a non-spontaneous endothermic process, and importantly, the Redlich-Kister model appears to offer a superior comprehension of the solubility of NH 4 CI. An increase in supersaturation and stirring rate augments both the growth and nucleation rates, while an increase in suspension density elevates the nucleation rate. These research findings are expected to be advantageous for those designers involved in the industrial crystallization process of NH₄Cl.

Thermodynamic analysis of highly efficient H2S absorption in diamine-ethylene glycol blends

Bo Wang,Tan Li,Xuhao Xie,Wenbo Zhao,Zhiyong Xu,Yongming Luo

The efficient removal of hydrogen sulfide (H 2 S) is crucial for clean energy and environmental protection, with amine-based absorption being the mainstream due to its cost-effectiveness and high efficiency. This work designed eight hybrid absorbents using organic diamines and ethylene glycol (EG). Absorption capacity measurements revealed that at 303.15 K and 1 bar, short-chain diamines exhibited ~1 mol/mol, while long-chain ones reached ~2 mol/mol. Notably, the 1,4-butanediamine-EG reached a remarkable capacity of 1.7 mol/mol at 0.2 bar, and the N , N , N ′, N ′-tetramethyl-1,6-hexanediamine-EG reached 2.06 mol/mol at 1 bar. Absorption capacity positively correlated with diamine chain length, and primary/secondary amines outperformed tertiary amines at low partial pressures. A reaction equilibrium thermodynamic model was established to verify the structure–capacity relationship via parameters like equilibrium constant K . The selectivity of H 2 S/CO 2 was studied. This provides theoretical guidance for H 2 S absorbent design and industrial applications.

Facile Synthesis of Polyethylene Glycol@Tannin-Amine Microsphere towards Cr(VI) Removal

Chengbing Yuan,Yan Zhang,Jinshui Yao,Qinze Liu,Fan-Gong Kong

Herein, a synthetic strategy for a rough microsphere Cr(VI)-adsorbent via the reaction of tannic acid (TA) and 1,6-hexanediamine (HA) and using polyethylene glycol (PEG) as surface modifier was presented. This adsorbent was characterized by a Fourier Transform Infrared spectrometer (FTIR), thermogravimetic analysis (TGA), X-ray photoelectron spectroscopy (XPS), etc. Certain factors, including contact time, PEG@poly(tannin-1,6-hexanediamine) (PEG@PTHA) dosage, initial concentration, and experimental temperature affecting the Cr(VI) adsorption performance of adsorbent were explored. PEG@PTHA can adsorb Cr and the Cr(VI) was reduced up to Cr(III) due to the existence of phenolic hydroxyl groups. Its adsorption capacity can reach up to 300 mg/g within 10 min and approximately 100% removal percentage below the initial concentration of 100 mg/L. Its behavior matched well with the Langmuir isotherm model and pseudo-second-order kinetic model. A PEG@PTHA adsorbent with maximum adsorption capacity (450 mg/g) has great prospects in Cr(VI)-sewage treatment.