Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122145
·
IF 7.5
Qing Zeng,Zhihui Zhou,Hongdan Wu,Wenming Fu,Xianyuan Fan,Guoyuan Lei,Junlin Peng
Polydimethylsiloxane (PDMS) membranes have shown potential for organic-organic pervaporation separations. However, their practical application is often limited by excessive swelling and insufficient selectivity, particularly in polar azeotropic systems. To address these challenges, a synergistic strategy integrating in situ growth of ZIF-8 nanoparticles with OTES-mediated interfacial alkylation was developed to fabricate a ZIF-8@PDMS mixed-matrix membrane for the separation of dimethyl carbonate (DMC)/methanol (MeOH) azeotropic mixtures. ZIF-8 nanoparticles were grown in situ within the PDMS matrix to establish selective transport pathways. Meanwhile, n -octyltriethoxysilane (OTES) was introduced to functionalize the membrane surface via alkylation, thereby modulating interfacial solvent affinity and mitigating membrane swelling. Under the optimized fabrication conditions (OTES content of 5 wt%, reaction temperature of 100 °C, and reaction time of 4 h), the resulting OTES-ZIF-8@PDMS membrane exhibited a high permeation flux of 9544.20 g·m −2 ·h −1 and a separation factor of 4.63 at 40 °C with a feed composition containing 30 wt% DMC. The membrane maintained stable separation performance over 20 days of continuous operation, demonstrating good operational durability. This study provides a rational membrane design strategy for the efficient pervaporation separation of organic-organic azeotropic systems.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Wenlu Song,Meng Guo,Junzhu Chen,Ting Qi,Xiuxiu Ren,Dongliang Jin,Jing Zhong
Dimethyl carbonate (DMC), as an environmentally friendly green chemical, has been widely used in industrial, pharmaceutical, and food applications. However, the utilization of methanol (MeOH) in its production process leads to the formation of azeotropic mixtures that are difficult to be separated. Similarly, this problem also presents a critical challenge in toluene (TOL) production process. Pervaporation technology has emerged as an effective solution to this challenge, due to its characteristics of energy-efficient and high-performance. Nevertheless, the development of membrane materials that simultaneously exhibit high flux and excellent selectivity remains a significant challenge. In this study, bis(triethoxysilyl)ethane (BTESE) was employed as a precursor to fabricate organosilica membranes by adjusting the H 2 O/BTESE molar ratio, and their separation performance for MeOH/DMC and MeOH/TOL systems was systematically investigated. The results illustrated that the optimized BTESE membrane exhibits outstanding pervaporation performance, achieving separation factor of 1868/113 and high fluxes of 2.12/1.55 kg m −2 h −1 for MeOH/TOL and MeOH/DMC mixtures, respectively. Further studies reveal that membrane performance is closely correlated with the H 2 O/BTESE ratios, and tuning the molecular sieving properties effectively balances flux and separation factor. Additionally, gas permeation experiments elucidate the mass transfer mechanisms of organic solvent molecules in the membranes, providing theoretical guidance for the design of high-performance organosilica membranes. This study offers an energy-efficient membrane-based solution for methanol separation in MeOH/DMC and MeOH/TOL mixtures.
研究领域:
材料科学
·
化学工程
·
膜分离技术
·
绿色化工
·
能源与环境工程
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-17
·
IF 4.38
Liu Ju,Chen Fei,Yang Wenbing,Guo Jianjun,Xu Guangwen,Jia Fenglei,Shi Lei
The activities of various MgO catalysts, which were prepared from different methods such as hydration synthesis, thermal decomposition, combustion, sol–gel and co-precipitation, were conducted in dimethyl carbonate (DMC) synthesis via transesterification of ethylene carbonate with methanol. MgO-P-Na 2 CO 3 -3.14 synthesized by the excess Na 2 CO 3 precipitation compared the best catalytic activity and stability, which could be reused for seven times without obvious deactivation. The DMC yield was as high as 69.97% at 68 °C. The transesterification reaction could be separated into two steps, and the samples obtained by NaOH precipitant exhibited better ring-opening capability, while the catalysts acquired by Na 2 CO 3 precipitant displayed superior transesterification ability. The structure-performance relationship was evaluated by multiple characterization methods. The results indicated that the as-synthesized catalyst derived from dried precursors with more crystalline magnesium carbonate was favorable for the promotion of DMC yield, and MgO-P-Na 2 CO 3 -3.14 with more Mg-O pairs, which were the active center for the transesterification of 2-hydroxyethyl methyl carbonate (HEMC) intermediate with methanol, resulted in more moderately basic sites left that was in accordance with the DMC yield variation. MgO-P-Na 2 CO 3 -3.14 with greater BET surface area and mesopore volume, relative low surface oxygen content and larger moderately basic sites amount compared the excellent activity in DMC synthesis.
研究领域:
化学工程
·
催化材料科学
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PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Chaofan Ma,Huiyu Su,Yazhou Yang,Chaoqi Zhu,Jiahong Tang,Kechen Zhou,Dawen Zeng
Dimethyl carbonate (DMC), the primary component of lithium-ion battery (LIBs) electrolytes, is volatile at room temperature and can serve as a key indicator for detecting electrolyte leakage. In this work, leaf-like Cs3Sb2Cl9 was synthesized via a single solvent solubility difference method, with its surface exhibiting strong orientation on the (110) crystal plane. The sensor demonstrated excellent gas-sensing performance toward detecting DMC (50 ppm of DMC of 3.94), with relatively short response and recovery times of 104 and 66 s, respectively (when tested 25 ppm of DMC), and a low detection limit of 100 ppb. In situ infrared spectroscopy first revealed that Cs3Sb2Cl9 catalyzes the decomposition of DMC into the byproduct methanol during the adsorption process. Density functional theory (DFT) calculations further elucidated the adsorption behavior of DMC on different active sites of the Cs3Sb2Cl9 (110) plane, indicating that the Sb site possesses a stronger adsorption affinity for DMC. Provides strong evidence that the B site of the perovskite serves as a highly active site. This study not only presents a preliminary exploration of Cs3Sb2Cl9 in gas sensing but also provides valuable insights into the sensing mechanisms of lead-free halide perovskites.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yinhua Hu,Xuanyu Ren,Xuyang An,XinXin He,Ping Guo,Tiezhu Liu,Jia Zhang
Early fault detection of lithium-ion batteries (LIB) is crucial for the safe operation of electrical measurement systems. Detecting the dimethyl carbonate (DMC) vapor in the LIB electrolyte can effectively improve the early warning time. However, the response speed of the existing semiconductor resistive gas sensors is significantly slower compared with the commonly used temperature and pressure sensors. To address the issue within gas sensors, a DMC gas sensor with an extremely fast response speed was developed based on mixed-phase bismuth oxide, which can effectively respond to 20 ppm DMC within 6 s. Moreover, the sensor successfully triggered the alarm approximately 15 min before the start of thermal runaway and within 22 s after the mechanical rupture of the battery in the simulated abuse test, demonstrating the application potential of gas sensor in the early fault warning of LIB.
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ACS Sensors
·
2025
·
IF 9.1
Chaoqi Zhu,Kechen Zhou,Huiyu Su,Yazhou Yang,Jiahong Tang,Xiaoxia Wang,Wulin Song,Dawen Zeng
The development of highly sensitive electrolyte leakage monitoring sensors is critical for enabling early fault detection and ensuring the safe operation of lithium-ion battery (LIBs) systems. In this study, perovskite LaFeO3 hollow microspheres with an average diameter of 850 nm were synthesized via a hydrothermal method. Gas-sensing tests demonstrated that the LaFeO3 hollow microsphere sensor exhibited exceptional responsiveness to dimethyl carbonate (DMC) gas, achieving a remarkable response value of 67.9 toward 10 ppm DMC at an operating temperature of 150 °C. The sensor also showed a fast response/recovery rate (170/90 s), excellent selectivity, long-term stability, and a low detection limit of 20 ppb. This excellent gas-sensing performance may be attributed to the high specific surface area and well-developed mesoporous structure of the hollow structure. Moreover, it demonstrated rapid response capabilities in simulated leakage detection scenarios. This work presents a novel perovskite LaFeO3-based sensor that can effectively detect DMC gas leakage and provide an effective strategy for enhancing safety monitoring in LIB applications.
研究领域:
材料科学
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电化学
·
传感器技术
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能源安全
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纳米材料
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功能材料
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PubMed
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 11
·7373-7388
·
IF 5.7
Zhang Hao,He Shiqi,Hu Yanli,Li Fengyan,Zhou Baoming
In this study, a chitosan-based high polymer antibacterial agent CS-g-DMC with high water solubility was synthesized via an environmentally friendly initiator system of H 2 O 2 and ascorbic acid (Vc). The CS-g-DMC is used for the long-effective antibacterial finishing of cotton fabric. SEM, EDS, FTIR, XPS, and XRD were conducted to characterize the finished fabric. After the treatment, the CS-g-DMC were cross-linked with cellulose by 1,2,3,4-Butane tetracarboxylic acid BTCA thus immobilized on cotton fabrics. Results showed CS-g-DMC had linked with cellulose by stable chemical bond and uniformly distributed on the surface of cotton fiber. The antibacterial test shows that after treatment, the inhibition rates of the cotton fabric against E. coli and S. aureus are above 99.9%. Moreover, the inhibition rates of the two bacteria reach 94.3% and 95.3% after washing ten times, respectively. The finished cotton fabric had significantly improved hydrophily; its contact angle decreased from 107° to 104°. Its breaking force significantly increased from 173.38 to 219.33 N, while its breaking elongation and moisture transmission rate had no significant decrease. In general, CS-g-DMC-finished cotton fabrics achieve long-lasting antibacterial properties and higher mechanical properties while retaining a high degree of wearing comfort.
研究领域:
材料科学
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高分子科学
·
纺织工程
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抗菌技术
·
表面化学
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Molecular Catalysis
·
2024
·
IF 3.9
Yulong Wu,Yingfang Nie,Li Sun,ZhenHao Xi,Zhen Liu
Zinc glutarate (ZnGA) is a prominent catalyst for the production of CO 2 -based poly(propylene carbonate). The original catalysts, ZnO-GA ( Cat 1 ) and ZnAc 2 -GA ( Cat 3 ), were prepared using ZnO and ZnAc 2 as Zn sources, respectively. ZnO-GA-H 2 O ( Cat 2 ) and ZnAc 2 -GA-H 2 O ( Cat 4 ) were prepared by water treatment of Cat 1 and Cat 3 , respectively. After water treatment, both Cat 2 and Cat 4 showed enhanced performance for copolymerization of CO 2 and propylene oxide. The characterizations demonstrated that H 2 O is a critical component that not only improves the crystallinity and external surface area of ZnGA, but also increases the number of surface Zn-OH groups. By adding a portion of cyanide, further modification on Cat 4 resulted in a group of ZnAc 2 -GA-H 2 O/DMC catalysts ( m-Cat 4 ). The polymerization reached a high yield of 1729 g poly/g Cat and a selectivity of 98.7 % at molar ratio of DMC/ZnGA = 1: 10 ( t = 24 h; T = 70 °C; P = 4 MPa). The modified ZnGA/DMC catalyst exhibited remarkable yield and selectivity for the copolymerization of CO 2 and propylene oxide to produce high molecular weight alternating copolymers (2.3 × 10 5 g/mol).
研究领域:
化学
·
材料科学
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Xiaoyan Leng,Wei Qin,Ning Guo,Xinliang Liu,Ming Wang,Yingfei Hou
Dimethyl carbonate (DMC) is an eco-friendly organic compound, but its production process generates a methanol (MeOH)/DMC azeotrope, resulting in high energy consumption for separation. With its low energy consumption and environmental benefits, pervaporation membrane separation technology presents a promising solution for separating azeotropic organic mixtures. In this study, polyethyleneimine (PEI) is employed as the membrane material for the separation of MeOH/DMC, owing to its strong affinity for MeOH. However, the poor organic solvent swelling resistance is a significant challenge for the PEI matrix. Therefore, ultrahigh molecular weight PEI (Mn = 750,000) is utilized, and graphene oxide (GO) is incorporated to improve the organic solvent resistance of the PEI-based membrane. The results indicate that the optimized membrane demonstrates a total flux of 0.67 kg·m -2 ·h -1 and a separation factor of 89 for a 10 wt% MeOH/DMC mixture at 60°C. Notably, enhancing the molecular weight of PEI and introducing GO contribute to a significant improvement in the membrane's resistance to solvent swelling, breaking the trade-off between separation performance and swelling resistance. This work demonstrates the strong potential of PEI membrane materials for effective application in the separation of MeOH/DMC.
研究领域:
膜科学
·
化学分离
·
高分子材料
·
环境工程
·
化学工程
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RSC Advances
·
2017
·Vol. 7
·期 10
·6114-6122
·
IF 3.108
Bingzhi Liu,Huaili Zheng,Xiangrui Deng,Bincheng Xu,Yongjun Sun,Yongzhi Liu,Jianjun Liang
A template assembly method was introduced to obtain a cationic hydrophobic micro-block structure based amphiphilic electrolyte poly(acrylamide-co-2-methacryloxyethyltrimethyl ammonium chloride) P(AM-DMC) in this work, thereby increasing charge density and enhancing charge neutralization ability at the same charge density. The alteration of copolymerization or homo-polymerization was evaluated by the changes in reactivity ratios, so as to unravel the mechanism of template assembly. The micro-blocks generated by the new distribution of sequences were demonstrated by 1H nuclear magnetic resonance spectroscopy (1H NMR) and differential thermal-thermogravimetric analysis (DSC-TGA). Two negative controls were employed in sludge dewatering experiments to further evaluate the advanced properties of the template-assembled polymer. The results further verified that the positive effect of template assembly on flocculation performance of the polymer was achieved mainly through two ways: improving charge density and generating the micro-block structure. It can be concluded that the introduction of template assembly into polymerization can improve the performance of the polymer.
研究领域:
环境科学
·
高分子化学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 26
·12477-12486
·
IF 3.3
Guanling Yang,Haobo Wang,Aizhong Jia,Jingde Li,Yanji Wang
Hierarchically porous CexZr1−xO2 materials were prepared using a simple and scalable method of solvent volatilization and used in the direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol. The effect of cerium sources and the Zr-doping amount on the textural properties of the synthesized CexZr1−xO2 materials was investigated in detail. The characterization results indicated that the sample Ce0.9Zr0.1O2 had the largest specific surface area (152.1 m2 g−1) and the highest oxygen vacancy concentration (34%) and displayed the highest catalytic activity with a DMC yield of 257.14 mmol g−1. Zr-doping plays a key role in improving the catalytic properties and stability of the synthesized catalyst.
研究领域:
催化化学
·
材料科学
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高影响因子
RSC Advances
·
2026
·Vol. 16
·期 2
·1202-1211
·
IF 4.6
Qiuyun Huang,Shiyu Liu,Weihua Shen,Yunjin Fang
For the carbonylation of methyl nitrite (MN) to dimethyl carbonate (DMC), a series of Ce(x)-UiO-66 were synthesized and utilized as supports for Pd/Ce(x)-UiO-66 catalysts. The characteristics of the carriers were investigated using XRD, SEM, TG, NH3-TPD and BET analyses. The results showed that doping cerium in the UiO-66 significantly enhanced the catalytic activity by improving the surface area, acidity and CO adsorption of the catalysts. Ce(0.1)-UiO-66, with the highest thermal stability (547.26 °C), presented the highest catalytic stability in DMC synthesis. It was proven that the damage of CO and the migration of Pd atoms occurred due to the replacement of ligands and metal clusters, which led to catalytic deactivation.
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