ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Zongze Yao,Shu Mi,Bin Chen,Fei Liu,Haining Na,Jin Zhu
The acylation modification of cellulose to make it processable is an important method to utilize this green, renewable material with broad prospects. However, it usually takes several hours or even more than 20 h to obtain products with a high degree of substitution (DS) through the methods reported in the existing literature, especially for cellulose acetate (CA). In this study, rapid homogeneous acylation of cellulose is achieved in a novel CO2 switchable solvent system by using microwave heating. CA products with DS ranging from 1.83 to 2.91 can be obtained within 3–15 min by using acetic anhydride as the acylation reagent. This strategy can also be applied for the synthesis of a series of cellulose esters with different side chain lengths, and it takes only 10 min to produce cellulose esters with a DS higher than 2.20 under microwave heating. This study suggests a facile and effective method for the synthesis of cellulose esters.
研究领域:
材料科学
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化学工程
·
绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xiang Wang,Haoran Wang,Min Li,Qingtao Guo,Ben Ge,Xingyu Xiong,Zhibin Yang
This work focuses on the development of high-performance La 0.1 Sr 1.9 TiFeO 6-δ (LSTF)-based fuel electrode materials through targeted Co substitution at the Ti site and Fe site. By selectively substituting Ti or Fe with Co element, lattice contraction and change of the Fe 3 ⁺/Fe 4 ⁺ ratio in LSTF double perovskite are achieved. La 0.1 Sr 1.9 Ti 0.8 Co 0.2 FeO 6-δ (LSTCF) material obtains higher oxygen vacancy concentration and better CO 2 adsorption capacity. Electrochemical impedance spectroscopy (EIS) test demonstrates that the La 0.1 Sr 1.9 TiFe 0.8 Co 0.2 O 6-δ (LSTFC) electrode exhibits superior performance in gas transport process, while the LSTCF electrode demonstrates significant advantages in oxygen ion conductivity and dissociative adsorption of CO 2 species. The single cell with the LSTCF electrode exhibits superior electrolysis performance, achieving a current density of 1.07 A·cm −2 at 800 °C and 1.8 V for CO 2 electrolysis. This work provides a novel pathway for the development of catalysts for solid oxide electrolysis cell (SOEC) fuel electrodes.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaochang Cao,Zhi Wang,Zhihua Qiao,Song Zhao,Jixiao Wang
Developing mixed matrix membranes (MMMs) is challenging because the interface between different matrices often forms undesirable structures. Herein, we demonstrate a method of creating suitable CO2-selective channels based on interface regulation that greatly enhances membrane separation performance. The poly(vinylamine), which also acts as a polymer matrix, was immobilized onto covalent organic frameworks (COFs) to obtain polymer–COF hybrid materials (COFp). The COFp and polymer matrix are highly compatible because they have the same segment. The polymer matrix was induced to penetrate the oversized COFp, resulting in an amino-environmental pore wall and appropriately sized CO2-selective channels dispersed in MMMs. The MMMs exhibited satisfactory membrane performance for CO2/N2, CO2/CH4, and CO2/H2 separation. A CO2 transport model for preferential adsorption and transport is clearly presented for the first time. The membrane separation mechanism is also discussed. This work demonstrates potential applications for material, interface, and membrane investigations.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Chaoqi Ge,Menglong Sheng,Ye Yuan,Fei Shi,Yi Yang,Song Zhao,Jixiao Wang,Zhi Wang
Mixed matrix composite membranes (MMCMs) are considered as one of the potential directions for the development of CO 2 capture membranes. Nevertheless, the high cost and the challenging nature of improving separation performance are significant obstacles that prevent MMCMs from being widely applied in practice. In this study, we developed a cost-effective modified pore-optimized MOF-808 (MOF-808@PVAm) and utilized it to fabricate high-performance CO 2 capture MMCMs. Specifically, MOF-808 and polyvinylamine (PVAm) were cross-linked by γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560), which improved the pore structure characteristics of MOF-808 and led to high-performance MMCMs. For 2 bar feed gas (CO 2 /N 2 , 15/85), the MMCM with 33.33 wt.% MOF-808@PVAm loading displayed remarkable CO 2 permeance of 2753 GPU and selectivity of 181. The prepared MMCM demonstrated good operational stability in simulated flue gas and exhibited potential for application in various gas purification fields (CO 2 /CH 4 , CO 2 /H 2 ) through gas permeation tests.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mufan Wang,Shiying Fan,Shaomin Liu,Xinyong Li
5-Hydroxymethylfurfural (HMF) serves as a key platform molecule for producing high-value chemicals via green and efficient photocatalytic oxidation. Transition metal oxides, particularly spinel substances, are promising heterogeneous catalysts due to their ability to promote interfacial electron transfer. However, the impact of interfacial electron transfer in HMF photocatalytic oxidation on spinel catalysts remains largely unexplored. In this study, we engineered Mn 4+ -O V -Co 2+ active sites in cobalt-based spinel by in-situ (MCO 4-δ -1) and post-doping (MCO 4-δ -2) strategies to investigate their impact on photocatalytic HMF oxidation. The microstructure morphology, chemical valence states, and band structure of prepared catalysts were systematically characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectra (DRS) techniques. The results revealed that the post-doping catalyst (MCO 4-δ -2) exhibited a higher density of surface oxygen vacancy (Ov), significantly enhancing charge transfer and HMF photocatalytic conversion activity. Specifically, MCO 4-δ -2 achieved an outstanding HMF oxidation product yield of 356.55 μmol g −1 under visible light over 4 h. Furthermore, density functional theory (DFT) calculations provided mechanistic insights, revealing that the oxygen in the aldehyde group of HMF preferentially occupies surface Ov sites at Mn 4+ -Ov-Co 2+ interfaces, thereby facilitating selective HMF oxidation pathways. This study not only expand the application scope of cobalt-based spinel photocatalysts in biomass valorization but also provides an insight on the effects of doping-induced interfacial electronic effects in photocatalytic oxidation reactions.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 11
·e202405440
·
IF 2
Chenxiao Pei,Nan Wang,Yuqi Zhang,Yuhang Zhong,Xingang Liu,Jianyuan Hou,Yuan Yuan,Renxi Zhang
Graphical A novel UIO-66/Pebax® 1657 mixed matrix membrane is developed via air plasma modification, significantly enhancing CO₂ separation performance. The plasma treatment introduces ─NH₂ groups and active sites, improving interfacial compatibility and CO₂ adsorption. The membrane achieves a CO₂ permeability of 453 Barrer and CO₂/N₂ selectivity of 37.8 demonstrating superior gas separation efficiency and stability. This paper synthesized a new mixed matrix membrane for CO 2 separation. First, the metal-organic framework UIO-66 was treated with air plasma for modification and then embedded in Pebax® 1657. The 10% UIO-66/Pebax® 1657 mixed matrix membranes treated with air plasma significantly improved interfacial compatibility and CO 2 adsorption capacity, showing excellent performance. Its permeability reached 453 Barrer as CO 2 and the selectivity was 37.8 as CO 2 /N 2 . It was confirmed by characterization techniques such as FTIR, XRD, XPS, TGA, NMR, and SEM that the plasma successfully introduced ─NH 2 groups and active sites on the UIO-66 surface, thereby significantly improving the interfacial compatibility and adsorption characteristics of the mixed matrix membrane. In this study, the high-performance CO 2 separation membrane aP-UIO-66/Pebax was innovatively enhanced through the synergistic effects of graft modification and defect engineering on UIO-66 using nonthermal plasma technology. This approach offers a novel strategy for membrane performance optimization.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Artificial Cells Nanomedicine and Biotechnology
·
2020
·
IF 3.343
Baiji Xue,Jinxiang Huang,Haoxiang Zhang,Bingliang Li,Man Xu,Yuelan Zhang,Maobin Xie,Xuefeng Li
Curcumin (CM) is a natural polyphenolic compound with multiple biomedical functions. However, clinical applications face more challenges due to its low dissolution rate and poor bioavailability. Micronization is an effective strategy to overcome these drawbacks. Herein, CM nanoparticles (CM NPs, ∼300 nm) were fabricated using solution enhanced dispersion by supercritical CO2 (SEDS). The solubility of CM NPs was remarkably enhanced. Aim to study the effects of micronization on the biological functions of CM, we investigated the antibacterial activity of original CM and CM NPs upon Pseudomonas aeruginosa. In vitro, the minimal inhibitory concentrations (MIC) assay, solid-medium spot assay, growth kinetics assay and morphologic observation using atomic force microscopy (AFM) confirmed that the anti-P. aeruginosa activity of CM NPs was enhanced compared to original CM. Moreover, CM NPs also showed stronger inhibition for adhesion and biofilm formation of P. aeruginosa compared to original CM. Experiments on mice infected with P. aeruginosa showed that CM NPs have a better therapeutic effect than the original CM in vivo. In summary, CM NPs may be a novel and promising therapeutic candidate for bacterial infection.
研究领域:
药剂学
·
纳米技术
·
微生物学
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生物医学工程
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药理学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1064-1069
·
IF 3.1
He Huan,Zou Zhengxi,Hua Weiming,Yue Yinghong,Gao Zi
A series of ZnO-modified cobaltous ion exchanged ZSM-5 catalysts is prepared using incipient wetness impregnation and characterized by X-ray diffraction (XRD), N 2 adsorption, transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DR UV-Vis), X-ray photoelectron spectroscopy (XPS), pyridine-adsorbed Fourier transform infrared (Py-IR) and Raman. Their catalytic performance towards CO 2 -assisted dehydrogenation of ethane to ethylene has been evaluated. The addition of ZnO onto CoZSM-5 obviously improved the yield of ethylene as well as the conversion of CO 2 . The promoting effect is attributed to the good activity of ZnO for the reverse water gas shift (RWGS) reaction, which enhances the coupling between RWGS and ethane dehydrogenation.
研究领域:
催化化学
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化学反应工程
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材料科学
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环境化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Shixiong Yuan,Daiming Song,Liang Li
Adsorption and activation of CO 2 are among the most intractable challenges of electrochemical CO 2 reduction reaction (CO 2 RR). Various metal-organic frameworks (MOFs), such as Calgary Framework 20 (CALF-20), have demonstrated superior CO₂ adsorption capabilities. However, given the exceptional stability of CO₂ molecules and the significant challenge in breaking their chemical bonds, there is a pressing need to develop electrocatalysts that can effectively activate CO₂. Herein, we explored a MOF pyrolysis modification strategy that utilizes the electronic properties of different functional ligands to promote CO 2 activation. The derivatives of Zn-based MOFs with three ligands, namely 1,2,4-triazole in CALF20, 2-methylimidazole in zeolitic imidazolate framework-8 (ZIF-8) and 2,5-dihydroxyterephthalic acid in Zn-MOF-74, were studied in an H-type cell. CALF-20-derived ZnO/nGNC was proved to be an efficient electrocatalyst towards CO 2 reduction with high selectivity to CO. After pyrolysis, electrons are transferred from carbon to metal, resulting in electron-rich active center Zn, effectively activating CO 2 and accelerating the reaction kinetics, thus leading to a superior performance. The result show that ZnO/nGNC exhibited a high Faradaic efficiency (FE) in the -0.85 ∼ -1.15 V vs RHE (maximum of 87.3 ± 0.6 %). This study gives a practical idea for the synthesis of electrocatalysts with electron-rich active centers.
研究领域:
材料科学
·
电化学
·
催化反应
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产品关联
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Siying Che,Jiachen Guo,Lu Gan,Qiaoxin Xiao,Haoran Li,Yuanbin She,Congmin Wang
An interesting phenomenon was found that fluorophore was introduced into ionic liquid (IL) to magnify fluorescence signal via the thermally activated delayed fluorescence process; thus up to 15 fold enhancements were achieved. Hence, we reported a succinct enhanced luminescence strategy to reduce single-triplet energy split by the tunability of ILs. This strategy could be extended to more kinds of ILs by the virtue of a preliminary DFT calculation screening. Moreover, the optical feature of IL sensor made it a promising candidate as a gas fluorescence sensor.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Haoyue Deng,Tiehu Li,Hao Li,Alei Dang,Yongkang Han
In this study, a composite material composed of Mg-MOF-74 and graphene oxide (GO) was synthesized to overcome MOFs’ limitations in CO 2 capture. At 273 K/101 kPa, the Mg-MOF-74 composite containing 6 wt% GO achieved 3.46 mmol/g CO 2 uptake and 114.4 CO 2 /N 2 selectivity, demonstrating 25.8 % and 29.3 % enhancements compared with pristine Mg-MOF-74. This enhancement is due to the optimization of CO 2 adsorption by the new pores formed at the interface and the strong affinity of GO functional groups for CO 2 molecules. Furthermore, due to the excellent properties of GO and its strong interaction with Mg-MOF-74, the composites show notable improvements in thermal, adsorption–desorption cycling, and moisture stability. Notably, the Mg-MOF-74 composite containing 6 wt% urea-modified GO exhibits optimal CO 2 adsorption/stability. This is not only due to the synergy between GO and Mg-MOF-74, but also because the amine groups and polar C O bonds in urea can boost adsorption/separation and enhance stability through amine-Mg 2+ coordination. These findings highlight Mg-MOF-74@GO composites as promising candidates for industrial CO 2 capture.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Liang Wang,Jinqiang Zhang,Jun Huang,Qun Cui,Yuezhao Zhu,Haijun Chen
Supported Ni and Ir nanocatalysts have been used in CO2 dry reforming of methane (DRM); however, their fast deactivation limited further applications. In this research, we introduced NiO nanoparticles (NPs) on the SiO2 surface ahead of the addition of the Ir source for the bimetallic Ir–Ni/SiO2 catalyst. The homogeneous NiO NPs provide finite spaces to prohibit the agglomeration of Ir NPs under H2 reduction. The Ir–Ni/SiO2 catalyst was obtained with ultrasmall bimetallic NPs (1.4 nm) uniformly distributed on the SiO2 surface. Owing to the synergistic effects within the bimetal, the catalytic performance on the fabricated bimetallic catalyst into the DRM reaction is significantly enhanced, with 1.2 times higher than the sum of the Ir and Ni monometallic catalysts. Besides, the side reaction of the reverse water–gas shift reaction is effectively suppressed, and the stability is also improved. This facile strategy provides another approach to fabricate ultrasmall and homogeneous bimetallic catalysts for efficient storage and conversion of fossil fuels.
研究领域:
化学工程
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）