SEPARATION SCIENCE AND TECHNOLOGY
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2018
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IF 1.2
Yajuan Li,Yanyang Wu,Kui Chen,Bin Wu,Lijun Ji,Jiawen Zhu
A polymer–salt aqueous two-phase system based on polyethylene glycol and sulfates was applied to explore the partition behavior of spiramycin. Binodal curves were measured by the turbidimetric titration method. The influence of temperature, salt concentration, and pH on the distribution behavior was investigated in detail by determining the partition coefficient and extraction efficiency. As pH and salt concentration increase, the partition coefficients increase accordingly. It was found that pH displays a significant influence on the partition behavior. The partition coefficient and extraction efficiency can reach 42.46 and 97.8%, respectively, at pH 9.0 and 15.80% (w/w) salt concentration.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Wanzhen Zhong,Wencong Hao,Shuhao Liang,Xinshenghui Zhu,Siyi Luo,Weiqiang Tan,Zongliang Zuo,Kangshuai Lin,Dongdong Ren
Polyethylene glycols (PEG) are widely employed and frequently detected in wastewater, and between 0.5 and 68 mg L −1 of PEG were found in river water and seawater. It puts significant pressure on COD treatment of the water environment. Nevertheless, PEG is not easily broken down by biological processes, and other treatment methods include drawbacks such as membrane blockage and stringent pH requirements. Ozone oxidation technology can overcome these drawbacks, but low ozone utilization and higher catalytic costs limit the industrialization of the technology to some extent. In this research, discarded copper slag was used as an in situ iron donator, and modified into a catalyst for ozone catalytic oxidation, which achieved lower costs and waste reuse. Based on the Response Surface Methodology simulation and experimental tests, to achieve the greatest catalytic performance, the copper slag was calcined at 710 °C for 3.5 h. Under optimal conditions, with the introduction of CS-710,3.5 to ozone oxidation, the removal rate of PEG was improved from 79.27 % to 97.40 % in 10 min with an initial PEG concentration of 20 mg L −1 . In addition, the COD removal rate was increased by 18.3 % and the first-order rate constant (k) was 2.66 times higher than that of the individual ozone system. After 10 cycles of reuse, the removal rate still reached 73.8 %, indicating the catalyst's good stability. The concentration of Pb and Zn dissolved was 1.6 and 4.4 μg L −1 , respectively, sufficient to meet Environmental quality standards for surface water (GB 3838-2002, China). Thus, the safety of the catalyst is proven. The reaction process based on the free radical mechanism, according to density functional theory (DFT), CS-710,3.5 enhanced the conversion of ozone to OH, O− 2, and 1 O 2 , and hastened the degradation of PEG. Despite taking a while to mineralize fully, PEG was effective in breaking down macromolecules into smaller ones. As such, it can be regarded as a successful PEG pretreatment technique.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ziqiang Wang,Yile Wang,Hugang Zhang,Hongjie Yu,You Xu,Kai Deng,Hongjing Wang,Liang Wang
Glycolic acid is used as a high-value-added chemical in a wide range of biological, chemical, and medical applications, and current large-scale production of glycolic acid usually suffers from harsh synthesis conditions and low selectivity. In this work, we report the coproduction of glycolic acid and hydrogen by electroreforming ethylene glycol using palladium–copper hydrides with hyperbranched nanocrystals (PdCu-H HNCs) as highly active electrocatalysts. The anodic ethylene glycol oxidation reaction (EGOR) requires only a low overpotential of 0.808 V at 100 mA cm–2. In a two-electrode system, PdCu-H HNCs show a low voltage of 0.824 V at 100 mA cm–2 for continuous production of glycolic acid and H2, with maximum Faraday efficiencies of 93% and nearly 100%, respectively. This work highlights the concurrent production of high-value glycolic acid and hydrogen with low energy consumption using palladium hydride-based electrocatalysts.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Xuemin Sun,Xiao Liu,Qiang Chen,Pingxia Guo,Yanyan Bai,Kun Zou,Ming Yi,Shuyan Yang,Meirong Cai,Feng Zhou,Weimin Liu
Two novel amino acid-based ionic liquids (AAILs) were synthesized and their tribological properties as water-ethylene glycol (W-EG) lubricant additives were investigated. The addition of 1 wt% of both AAILs to W-EG can significantly enhance the anti-corrosion, friction-reducing and anti-wear properties of the lubricants. Compared to W-EG, the coefficient of friction and wear volume are reduced by about 50% and 75%, respectively. The physical adsorption film and the tribochemical reaction film derived from AAILs collectively establish a protective barrier at the friction interface, endowing the lubricants with superior lubricity and load-carrying capacity. These two sulfur-free and halogen-free AAILs are promising for application in metal working fluids and hydraulic fluids.
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LANGMUIR
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2012
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IF 4.186
Jiang Wu,Shengfu Chen
The strong surface hydration layer of nonfouling materials plays a key role in their resistance to nonspecific protein adsorption. Poly(ethylene glycol) (PEG) is an effective example of materials that can resist nonspecific protein adsorption and cell adhesion. Thus, the strong interaction between water molecules and PEG was investigated through each T2 component in water/PEG mixtures using multiexponential inversion of T2 relaxation time measured by the Carr–Purcell–Meiboom–Gill (CPMG) sequence of low-field nuclear magnetic resonance (LF-NMR). Results show that about one water molecule is tightly bound with one ethylene glycol (EG) unit, and additional water molecules over 1:1 ratio mainly swell the PEG matrix and are not tightly bound with PEG. This result was also supported by the endothermic behavior of water/PEG mixtures measured by differential scanning calorimetry (DSC). It is believed that the method developed could be also applied to investigate various interactions between macromolecules and other small molecules without using deuterium samples, which might open a novel route to quantitatively measure guest–host interactions in the future.
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PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
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IF 4.4
Yangengchen Zhong,Mingjie Liu,Chuyang Xiang,Yeying Lin,Youjun Guan,Kunyu Ren,Chengyun Ning,Lei Zhou,Limin Lu,Rumin Fu,Guoxin Tan
Conductive hydrogels are characterized by their extraordinary stretchability, flexibility, and biocompatibility, making them ideal materials for flexible wearable sensors. However, they often encounter challenges such as freezing and water loss, which can adversely affect their conductivity and stretching performance. In this study, we introduce a conductive hydrogel incorporating polyethylene glycol (PEG), acrylic acid (AA), acrylamide (AM), and lithium chloride (LiCl), which exhibits low-temperature tolerance, resistance to drying, self-adhesion, and mechanical robustness. The hydrogel’s excellent mechanical properties, including an elongation at break of 1120% and a toughness of 2.9 MJ m–3, are attributed to the formation of a tight polymer network between P(AA-AM) and PEG through hydrogen bonding. The multiple hydrogen bonding system between PEG and the polymer networks, combined with the hydration of LiCl and electrostatic interactions between the carboxyl group and Li+, significantly enhances the hydrogel’s freezing resistance (down to −60 °C), water retention (with only 20% water loss after 15 days), and self-adhesion (with an adhesion strength to pig skin of up to 55.08 kPa). When employed as a flexible sensor, the P(AA–AM)/PEG/LiCl hydrogel exhibited excellent sensing properties for monitoring various human motions, with an impressive gauge factor of 1.91 and electrical conductivity of 4.50 S m–1 Moreover, it maintained a high electrical conductivity (3.82 S m–1) even at −20 °C. The conductive hydrogel consistently produced stable and reliable electrical signals in response to external mechanical stimuli, making it a preferred material for human motion monitoring.
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JOURNAL OF FOOD SCIENCE
·
2024
·Vol. 89
·期 10
·6707-6719
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IF 3.2
Qilei Wang,Zhenzhen Feng,Chan Shi,Xingang Lyu,DaiDi Fan
Sulforaphane-loaded nanoparticles (NP-SF) were prepared in this study to improve their biological effects. Based on propylene glycol alginate and zein as wall materials and anthocyanin and CaCl 2 as crosslinking agents, the NPs were encapsulated by the crosslinking method and freeze-dried. With the increasing contents of anthocyanin and Ca 2+ , the encapsulation efficiency and loading capacity of NP-SF were both increased. In vitro simulated digestion experiments showed controlled release of SF from the NPs. The pharmacokinetics confirmed that NP-SF exerted a slower release effect in rats, with improved SF bioavailability and protective effects on liver injury induced by N -diethylnitrosamine in mice. NP-SF reduced serum indicators of liver injury, increased the activities of antioxidant enzymes and GSH levels, and reduced malondialdehyde levels in the liver. In addition, SF activated the Keap1/Nrf2 signaling pathway and upregulated the expression of the Nrf2 downstream genes NQO1 and heme oxidase 1. High doses of NP-SF, in particular, had a higher therapeutic effect. In conclusion, encapsulation enhanced the biological activity of SF and promoted physiological function.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Huanbo Wang,Yuan Fu,Yue Liu,Jinpeng Li,Xianzu Sun,Tian Liu
Dynamic covalent networks exhibit intriguing reprocessing and self-healing properties, but they usually require complex synthesis procedures and frequently use hazardous solvents. Herein, we proposed a green synthesis strategy for dynamic polyurethane that was conducted in a one-pot, solvent-free manner that addresses the aforementioned problems. A new type of low-transition-temperature mixture (LTTM) was prepared by blending pyrogallol and poly(ethylene glycol), which allowed the reagents to remain as liquids at room temperature. The formation of LTTMs was ascribed to the presence of intermolecular hydrogen-bonding and van der Waals interactions between the molecules of the two reagents. Self-healing and reprocessable dynamic polyurethane with dissociative exchangeable phenol–carbamate bonds was synthesized by incorporating a hexamethylene diisocyanate trimer as the third component into the LTTMs, followed by thermal curing. The properties of the dynamic polyurethane could be adjusted by modifying the pyrogallol content in the LTTMs. The preparation of LTTMs and dynamic polyurethane did not require any purification steps and solvents, which provides an innovative approach to polymer synthesis that is efficient and environmentally friendly.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
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IF 6.3
Qiyuan Liu,Fangrui Chang,Jiangpeng Su,Yuanying Zhang,Daili Feng
Phase change materials (PCMs) are a crucial focus of research in the field of photothermal energy storage. However, due to their inherently low photothermal conversion efficiency, traditional PCMs absorb solar energy scarcely. The photothermal conversion ability of PCMs are usually enhanced by incorporating photothermal conversion nanoparticles. Polydopamine (PDA) is widely used in various fields due to its excellent photothermal conversion and adhesion performance. We dispersed PDA into PEG containing CuNPs to test the effect of PDA on thermal properties of cPCMs. Our team has conducted experiments to test the thermal characteristics and photothermal conversion ability of cPCMs. Results demonstrated that the addition of PDA mitigated the enthalpy loss caused by integrating CuNPs. The enthalpy of melting of cPCMs with addition of polydopamine is greater than that without polydopamine for the composites with different mass fractions. The addition of PDA in cPCMs enhanced their photothermal conversion capacity, resulting in higher temperatures being achieved within the same exposure time compared to samples without PDA. Therefore, the cPCMs with dispersed polydopamine can store higher energy. Meanwhile, PDA also improved the overall thermal conductivity of the material. Our work provided a new method to utilize the photothermal properties of polydopamine. Meanwhile, it can reduce the cost of photothermal energy storage PCMs and further improve the potential of PCM energy storage.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
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IF 3.7
Qinglian Wang,Dingbang Zhao,Huaifang Li,Xin Gao,Weifeng Shen,Chen Yang,Changshen Ye,Ting Qiu
The production of high-purity Propylene Glycol Monomethyl Ether Acetate (PMA) through the transesterification of Propylene Glycol Monomethyl Ether (PM) and Methyl Acetate (MeOAc) is traditionally catalyzed by sodium methoxide. However, the practical application of this method is significantly hindered by the inherent limitations of sodium methoxide, such as its high sensitivity to moisture and propensity for solid precipitation, which impede its effective use in continuous processes. This work proposed a continuous catalytic distillation (CD) process utilizing Amberlyst 15 cation exchange resin as the catalyst. A comprehensive series of reaction kinetic and CD experiments were conducted to evaluate the performance of the proposed process. The results demonstrate that under the optimal operating conditions, namely an ester-to-ether molar ratio of 6:1, a reflux ratio of 5:1, a total feed rate of 0.92 g‧min −1 , and an evaporation rate of 266.47 m 3 ‧m −2 ‧h −1 , the conversion rate of PM achieves 99.95%, and the PMA yield is 97.31%. Based on these findings, a process flowsheet for a continuous CD process tailored for the production of electronic-grade PMA is presented. This design incorporates light and heavy removal steps to ensure the production of PMA with a purity of 99.99%. Additionally, the process utilizes pressure swing distillation to recover MeOAc, thereby enhancing the overall efficiency and sustainability of the production process. The proposed continuous CD process offers a highly efficient, cost-effective, and environmentally sustainable solution for the production of electronic-grade PMA.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qin Yang,Yue Zhang,Zechuan Yu,Ke Lv,Yong Ye,Ji Zhou,Ning Lin
Hydrogels have gained increasing attentions on account of their “soft and wet” nature, but the inherent low mechanical performance and poor structural stability severely limits their practical application. Herein, a hybrid method was developed to achieve the reinforcement of polyacrylamide (PAM) based on grafting with polyethylene glycol diglycidyl ether (PEGDE) and combination with amination-modified cellulose nanocrystals (ACNCs). By constructing the PEGDE and MBAA dually cross-linked PAM hydrogel, its energy dissipation efficiency was increased by 4.6 times. The flexible PEGDE chain effectively realizes the dissipation of mechanical energy and the optimal distribution of stress, even in the swollen state. Furthermore, the incorporation of ACNC effectively facilitates the development of a polymer-nanoparticle composite architecture. The result demonstrated that ACNC-reinforced hydrogel achieves a three-fold improvement in both mechanical stiffness and energy dissipation capacity. ACNC and PEGDE form a chain-entangled network via covalent bonding, while the “sacrificial bond”-like structures constructed on their surfaces exhibit a unique energy dissipation mechanism, as further clarified by structural simulations. Moreover, the hydrogels demonstrated minimal cytotoxicity toward mammalian cells, demonstrating excellent biocompatibility. The proposed strategy of this study is expected to inspire the researchers to design structural or load-bearing hydrogels for potential biomedical applications.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Fan Li,Yimeng Liu,Jun Wang,Yu Zhou,Junjie Tan,Hongxiang Chen,Hongye Yan,Xinghua Liao
To increase the water solubility of chitosan and enhance the mechanical strength of chitosan-based in-situ hydrogel, poly(ethylene glycol) monomethyl ether-grafted chitosan (PCS) was fabricated by a simple and efficient modification method with hexamethylene diisocyanate (HDI) as bridging agent, and then a series of poly(ethylene glycol)/chitosan-based in situ hydrogels (PCS@gel) were prepared from PCS and aldehyde-terminated poly(ethylene glycol) (DF-PEG) as cross-linking agent. The resultant PCS shows good water solubility in the absence of acid and its solid content is up to 8 wt%. By studying the effects of the mass ratio of PCS to DF-PEG and their solid content on the gel time and properties of PCS@gel, the results demonstrate that increasing the solid content of precursor solution can significantly shorten the gel time and improve its mechanical properties and adhesion strength. When the mass ratio of PCS to DF-PEG is 1:1, PCS@gel has a shorter gel time and higher mechanical strength. While the mass ratio of PCS to DF-PEG is 5:1, PCS@gel has better adhesion properties. Besides, PCS@gel also has good self-healing ability, antibacterial effect, low cytotoxicity and the ability to promote cell migration. Therefore, PCS@gel will have a promising application as a wound dressing.
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