ACS Applied Materials & Interfaces
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2021
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IF 9.229
Wenxiu Li,Wei Li,Zanwu Guo,Yi Song,Shaoru Tang,Yanan Ma,Xueqing Xing,Qian Wang
The atomically thin nanosheets of graphitic carbon nitride (g-C3N4) with mesopores have been successfully exfoliated with supercritical CO2 (scCO2). The thickness of the as-synthesized samples could be directly tailored by simply regulating the scCO2 pressure. The obtained bilayer mesoporous g-C3N4 nanosheets doped with monatomic Co through a microwave-assisted approach havve been employed as single-atom catalysts to enhance the photocatalytic hydrogen evolution performance. The as-prepared Co/P/CN-sc sample exhibited a boosted H2 production performance due to its unique structural advantages by exposing more active sites and facilitating the separation of charge carriers. Based on X-ray photoelectron spectroscopy, steady-state and time-resolved photoluminescence spectroscopy, X-ray absorption fine structure measurement, and density functional theory (DFT) calculations, a possible mechanism has been proposed. The work shows a new perspective for designing an inexpensive photocatalyst with a unique structure through a facile and green approach for photocatalytic hydrogen evolution.
研究领域:
材料科学
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催化化学
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能源化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
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2022
·Vol. 37
·期 18
·3049-3059
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IF 2.909
Ma Chang,Xu Chengcheng,Meng Qingfang,Yang Haili,Xie Rui,Zhang Huiping,Tu Haoyu,Zhao Yueqiang,Wang Mingyan,Xu Guoxiang,Zhu Jing
In this paper, with cellulose microsphere as the substrate, a polyaniline/cellulose composite was prepared by means of in situ polymerization in supercritical CO 2 (SCCO 2 ) environment, and the effect of experimental pressure, temperature, and reaction time on the morphology and electrochemical properties of the composite were explored. In addition, the electrochemical properties of the composite were compared with the one prepared under normal temperature and pressure condition (NPT). The results show that the polymerization time of aniline in SCCO 2 is greatly shortened comparing with chemical oxidation of 6 h, and the capacitance of the composite prepared in SCCO 2 can reach 391 F·g −1 at the scanning rate of 5 mV·s −1 , which is higher than 286 F·g −1 under NPT. After 300 charge–discharge cycles, the capacitance retention of the composite prepared in SCCO 2 and NPT are 91% and 83%, respectively. The stability of the composite material prepared in SCCO 2 is significantly improved. Graphical abstract
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2023
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IF 3.9
Tianping Zhang,Shun Yao,Lu Wang,Weijun Zhen,Ling Zhao
Silicone rubber foam was prepared by direct rapid depressurization foaming process using supercritical CO 2 as foaming agent. It was found that under high temperature and pressure, the dissolution of CO 2 and the vulcanization reaction occurred simultaneously. The vulcanization degree range with good cell morphology was between 19.8% and 48.2%. When the saturation pressure exceeded 16 MPa, the cell morphology did not depend on foaming pressure. When the temperature was increased from 110 °C to 140 °C, the degree of vulcanization increased from 1.8% to 60.5%, and the cell size ranged from 13.9 µm to 646.4 µm, with an order of magnitude variation in cell density. This study identified the key control factors for supercritical CO 2 relief foaming of silicone rubber and provided a fast and efficient preparation method, as well as theoretical guidance, for obtaining lightweight microporous silicone rubber foams.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
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2023
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IF 7.7
Qin Fang,Huanda Zheng,Shengnan Li,Tao Cai,Fuer Zheng,Laijiu Zheng
Large degree of orientation, crystallinity, and high glass transition temperature of aramid make the fibers exhibit ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight and other excellent properties. However, the resulting poor dyeability and water pollution problems of aramid greatly limits its application in protective areas. An eco-friendly supercritical CO 2 assisted printing strategy for meta-aramid was developed firstly in this study. The effects of treatment temperature, time, pressure and dye concentration on the printing properties were investigated. The obtained results showed that the K/S values of the printed meta-aramid increased with the enhancing of CO 2 temperature, treatment time and CO 2 pressure. Compared to tradition printing, higher color depth can be obtained by supercritical CO 2 assisted printing with 40% sodium carboxymethyl cellulose and 20% guar gum as original paste. The K/S values of the meta-aramid with Cationic Pink X-FG in supercritical CO 2 was 12.18 while that of the samples with Cationic Yellow 5GL was 5.42. Washing and rubbing colorfastness rated above 4 were reached at 180 °C for Cationic Pink X-FG and at 160 °C for Cationic Yellow 5GL in supercritical CO 2 . In addition, up to 99% outline sharpness and acceptable stiffness, air permeability and mechanical properties was obtained, which demonstrated that the meta-aramid fabrics with supercritical assisted printing could better meet the wearability requirements.
研究领域:
纺织科学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
ENERGY & FUELS
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2023
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IF 5.3
Chen Huang,Ying Zhang,Shuofan Li,Quan Shi,Suoqi Zhao,Linzhou Zhang
With the escalating global energy crisis and burgeoning environmental concerns as a result of the accumulation of used lubricating oil, the urgency and economic potential of recycling this waste is undeniably critical. Conventional methods, such as distillation and hydrogenation, often stumble upon operational difficulties as a result of thermochemical decomposition, while advanced procedures, like molecular distillation and membrane separation, face industrial scale-up, owing to prohibitive costs and limited separation capabilities. Herein, this study heralds the emergence of supercritical CO2 (SC-CO2) extraction, which can exemplify superior efficacy in addressing these concerns. Leveraging the high solvency under extreme pressure and low-temperature conditions, SC-CO2 can selectively separate undesirable components, reducing coke formation and simplifying subsequent refining stages. The comprehensive analysis, conducted using gas chromatography–mass spectrometry and high-resolution mass spectrometry, revealed the selectivity of SC-CO2 toward saturates with a smaller molecular weight. On the basis of this analysis, the optimal extraction condition was determined. Implementing a two-stage process at 70 °C and 10–20 MPa, we effectively eradicated residual small molecules and large polar compounds, yielding an intermediate fraction rich in isoparaffins and 1–4 ring naphthenes with a carbon distribution of C25–40. Notably, the recovery rate of saturates was 60%. Critically, the removal rate of undesirable components in recycled lubricating oil is remarkably high, reinforcing the practical viability and exceptional advantages of SC-CO2 extraction for lubricating oil recycling as a sustainable and economically rewarding solution to pressing global energy and environmental predicaments.
研究领域:
化学工程
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环境科学
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能源技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 5
·3541-3550
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IF 3.201
Ruyi Fang,Chengwei Lu,Wenkui Zhang,Zhen Xiao,Hongfeng Chen,Chu Liang,Hui Huang,Yongping Gan,Jun Zhang,Yang Xia
A novel synthetic strategy has been successfully developed, which utilizes supercritical CO2 (SC-CO2) to fabricate sulfur-modified zeolites (zeolites@S) for Hg2+ removal from water. Owing to the low viscosity, high diffusivity and excellent dissolving capacity of SC-CO2 as well as the nontoxicity, noninflammability and being a low-cost solvent it exhibits the strong ability to expand the crystal structure of zeolite and the high-efficiency transfer of sulfur in zeolite matrices. Benefiting from this unique microstructure, zeolites@S adsorbents provide abundant pores and voids for absorbing Hg2+, and synchronously offer extra active sites for chemically trapping Hg2+ with sulfur. The pseudo-first-order kinetic/pseudo-second-order kinetic models and Langmuir/Freundlich isotherm models have been employed to study the adsorption behaviors and adsorption kinetic parameters. The results demonstrated that zeolites@S-15 (sulfur content = 15 wt%) exhibited the highest adsorption capacity and the best kinetic parameters for Hg2+ relative to other samples. This work will not only provide important reference for the rational design of zeolite based adsorbents for Hg2+ removal from aqueous solution, but also pave a new way to boost the commercialization of low-cost and high-efficiency functionalized adsorbents for purifying wastewater.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2013
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IF 2.206
Hong Xu,Fangfang Tong,Jian Yu,Lixiong Wen,Jun Zhang,Jiasong He
Poly(methyl methacrylate) (PMMA) and sodium montmorillonite (Na-MMT) were melt-blended with 1-dodecyl-3-methylimidazolium hexafluorophosphate (C12mimPF6) to prepare nanocomposites containing well-dispersed MMT layers in nanoscale and freely existed excess C12mimPF6. A synergistic effect of MMT and C12mimPF6 on the foaming behavior of nanocomposites was revealed in this study. At the mild conditions of 17 MPa and 35 °C, neat PMMA and PMMA/C12mimPF6 and PMMA/Na-MMT samples were not foamed, while cells were induced in nanocomposites containing a certain amount of free C12mimPF6. At 25 MPa/90 °C, foamed nanocomposites exhibited higher nucleation efficiency and cell density, and smaller cell sizes with narrower size distribution than that of neat PMMA and those binary samples. The results indicated that the MMT nanoparticles produced heterogeneous nucleation, and increased the modulus of polymer matrix to depress cell coalescence. The presence of free C12mimPF6 decreased the energy barrier for cell nucleation and facilitated the dispersion of MMT nanoparticles via in situ organic modification.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2021
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IF 2.475
Jia-Lun Zhong,Nadeem Muhammad,Shun-Quan Chen,Li-Wei Guo,Jia-Sheng Li
The essential oils of Artemisia argyi Lévl. et Vant were extracted and separated using three methods, hydrodistillation (HD), supercritical fluid extraction (SFE), and SFE coupled molecular distillation (SFE-MD). Various extraction parameters of SFE were optimized by process modeling of Hansen solubility parameters which are 30 MPa, temperature 45°C, no co-solvents, extraction time 2 h, and flow rate of 90 kg/h. The essential oils obtained by HD and SFE-MD have similar major compositions. The antimicrobial activities were examined according to the agar well diffusion method and the minimum inhibition concentrations against Staphylococcus aureus and Escherichia coli were compared.Abbreviations A. argyi, Artemisia argyi; CFU, Colony Forming Unit; DMSO, dimethylsulfoxide; E. coli, Escherichia coli; GC-MS, Gas Chromatography-Mass Spectrometer; HD, hydrodistillation; HSP, Hansen solubility parameters; MIC, minimum inhibition concentration; OSE, organic solvents extraction; RSM, response surface methodology; SCCO2, supercritical-CO2; SFE, supercritical fluid extraction; SFE-MD, SFE coupled molecular distillation; SMILES, Simplified Molecular Input Line Entry Syntax; S. aureus, Staphylococcus aureus;
研究领域:
植物化学
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分离技术
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药用植物研究
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
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2022
·
IF 8.321
Ye Qu,Yanglin Chen,Yifei Ye,Ping Xu,Jianmin Sun
Heterogenization of homogeneous catalysts without the loss of activity is still a huge challenge. Herein, homogeneous [HTMG][His][I] amino acid ionic liquid (IL), consisting of 1,1,3,3-tetramethylguanidine cation, histidine anion and iodine anion, were introduced into the pore channels of SBA-15 substrate with the assistance of supercritical CO 2 (scCO 2 ) media. Due to its low viscosity, high diffusivity and absence of surface tension, scCO 2 enabled [HTMG][His][I] to highly disperse in SBA-15 pore channels. Surprisingly, [HTMG][His][I]/SBA-15 heterogeneous catalyst displayed higher CO 2 cycloaddition activity (95% propylene carbonate yield) than equivalent molar pristine [HTMG][His][I] homogeneous catalyst (69% propylene carbonate yield) under the identical conditions. The significantly enhanced activity was resulted from the synergistic effect of [HTMG][His][I] and SBA-15 support. Moreover, [HTMG][His][I]/SBA-15 performed outstanding universality of various epoxides and reusability. This work developed a promising strategy to heterogenization of homogeneous IL catalyst assisted by scCO 2 as synthetic media and provided an efficient catalyst for CO 2 conversion.
研究领域:
化学工程
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催化材料
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绿色化学
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产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2023
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IF 3.9
Sijia Cheng,Shengnan Li,Huanda Zheng,Bing Du,Laijiu Zheng
An ecofriendly printing strategy was developed for meta-aramid using supercritical CO 2 as treatment medium. With 40% sodium carboxymethyl cellulose and 60% guar gum as original paste, violet and yellow hue were obtained for the meta-aramid fabric. After supercritical CO 2 treatment, 40% printing permeability with basic violet 16% and 60% printing permeability of basic yellow 40 were reached. Moreover, the fluctuation of stiffness, the air permeability and the breaking strength of the printed meta-aramid can meet on the wearable requirement. Compared with the water-based printed aramid , washing and rubbing color fastness rated above 4 were obtained at 160 °C for basic violet 16 and at 180 °C for basic yellow 40. In addition, the printed samples presented two-photo fluorescence, and the fluorescence emission uniformly distributed throughout the entire fabric surface, which demonstrates that the printed meta-aramid can be utilized as warning materials.
研究领域:
材料科学
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纺织工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
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2022
·
IF 8.321
Zi-Dan Wang,Hu-Hong Peng,Yi-Xin Guan,Shan-Jing Yao
Bioavailability of oral administration is quite limited due to hydrophobicity of most of cancer drugs. Emphasis has been placed on the development of oral drug delivery systems to enhance solubility and stability of chemotherapeutics. In this work, a novel oral drug delivery system based on emulsion was implemented to encapsulate curcumin , in which ethylcellulose was employed as oil phase polymer while gum arabic was selected as emulsifier and wall material. After processed by ultrasonic emulsification , oil-in-water emulsion loaded with curcumin was transformed from liquid state to solid particles by an improved supercritical CO 2 assisted atomization technique (SAA-HCM) to achieve its long-term stability. Effects of SAA-HCM operating conditions on sizes and distributions of microparticles were investigated in detail and particle formation mechanism was discussed. The chemical stability and amorphous form of microparticles were identified by solid characterization. In vitro drug release behavior of curcumin-loaded microparticles exhibited controlled release and enzyme triggered properties, which implies the potential in the application of colon targeted delivery. This work expands the application of SAA-HCM technique to emulsion, which will be of great importance in the design of water-insoluble drug loaded microparticles with elaborate structures.
研究领域:
药剂学
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生物医学工程
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Wenxiang Wang,Hongxin Guo,Yutong Ding,Zhou Chen,Ling Yu,Songdi Wu,Tairong Kuang
Polymer foams, particularly those prepared using supercritical carbon dioxide (Sc-CO 2 ), are extensively utilized in diverse applications like thermal insulation and packaging due to their lightweight and efficient properties. However, the effectiveness of Sc-CO 2 foaming is often limited by low cell density and large cell size, mainly resulting from insufficient nucleation control and inadequate gas management. In this study, hollow metal-organic frameworks (MOFs) (HZIF-8) were introduced as effective nucleating agents in Sc-CO 2 -assisted polystyrene (PS) foaming. Owing to their unique hollow structure and high internal surface area, HZIF-8 significantly enhances gas adsorption and storage capacity, thereby improving nucleation efficiency during the foaming process. The results show that incorporating HZIF-8 into PS significantly increases the cell density (up to 1.4 × 10 9 cells cm −3 ) and decreases the average cell size (to 8.6 μm) under optimal foaming conditions (13.8 MPa, 100 °C). Compared to conventional ZIF-8 nanoparticles, the hollow structure of HZIF-8 facilitates more efficient CO 2 uptake, leading to a finer microcellular morphology, more stable foam expansion, and enhanced mechanical properties. These results demonstrate the potential of hollow MOFs in creating high-performance microcellular foams, with promising applications in energy-efficient insulation, lightweight packaging, and functional materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）