Impregnation of ionic liquids in mesoporous silica using supercritical carbon dioxide and co-solvent

Xu, Qinqin; Yin, Jinling; Zhou, Xue-Ling; Yin, Guomao; Liu, Yifan; Cai, Pei Yang; Wang, Aiqin

doi:10.1039/c6ra20287j

Cited by 22 publications

(9 citation statements)

References 30 publications

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“…72 For the SCFD method, since supercritical carbon dioxide (scCO 2 ) has low surface tension and can dissolve ILs by adding little cosolvent to lower the viscosity of IL, the IL loading and dispersion are improved compared to those prepared by the impregnation method with higher CO 2 capacity. 73 Moreover, Wu et al 74 found that when there is polar organic compounds such as acetone and ethanol, the IL will be dramatically dissolve in scCO 2 , especially adding more than 10 mol% of the compounds in scCO 2 . Yin et al 54 The supported conventional IL adsorbents are summarized in Table 1.…”

Section: Supported Il Adsorbentsmentioning

confidence: 99%

State of the art of ionic liquid‐modified adsorbents forCO₂capture and separation

Zheng

Zeng

et al. 2021

AIChE Journal

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The enormous emission of carbon dioxide (CO 2 ) from industries has triggered a series of environmental issues. In recent years, ionic liquids (ILs) as novel absorbents are widely used for CO 2 capture owing to their low vapor pressure and tunable structures. IL-modified adsorbents have the advantages of both ILs and porous supports, such as high CO 2 selectivity and high specific surface area, which are novel agents to capture CO 2 with broad application prospects. In this review, more than 140 IL-modified adsorbents for CO 2 capture in recent years were systematically summarized. The types of ILs including conventional ILs and functionalized ILs on CO 2 separation performance of different IL hybrid adsorbents, and their adsorption mechanisms were also discussed. Finally, future perspectives on IL-modified adsorbents for CO 2 separation were further posed.

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Section: Supported Il Adsorbentsmentioning

confidence: 99%

State of the art of ionic liquid‐modified adsorbents forCO₂capture and separation

Zheng

Zeng

et al. 2021

AIChE Journal

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“…The impregnation method 29 was applied to the synthesis of the EDA-M-SiO 2 . In a typical experiment, 2 g of EDA was dissolved in 20 g of anhydrous ethanol and stirred at room temperature for 40 min until the EDA completely dissolved.…”

Section: Chemical Modification Of M-siomentioning

confidence: 99%

A Novel Mesoporous SiO₂ Material with MCM-41 Structure from Coal Gangue: Preparation, Ethylenediamine Modification, and Adsorption Properties for CO₂ Capture

Liu

et al. 2018

Energy Fuels

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A novel mesoporous SiO2 material (M-SiO2) with MCM-41 structure was readily fabricated from the inexpensive coal gangue via a hydrothermal reaction in the presence of cetyltrimethylammonium bromide (CTAB) for CO2 capture. On the basis of orthogonal experimental results, the optimum conditions for the preparation of M-SiO2 were identified as follows: the SiO3 2– leaching of 21 g/L from coal gangue, the CTAB concentration of 0.25 mol/L, the HCl concentration of 2.5 mol/L, the hydrothermal temperature of 393.15 K, and the hydrothermal time of 20 h. Under the optimum condition, the M-SiO2 exhibited an adsorption capability of 9.61 mg/g to 8% CO2 at 298.15 K. To further improve the CO2 adsorption performance, the M-SiO2 was chemically modified using ethylenediamine (EDA), and the optimum conditions for the modification of M-SiO2 were identified as follows: the impregnation time of 10 h, the drying temperature of 343.15 K, and the ratio of EDA/M-SiO2 = 2:1. Under the optimum conditions, the adsorption capability of EDA-modified M-SiO2 (EDA-M-SiO2) was increased by 83.5 mg/g. The obtained M-SiO2 and EDA-M-SiO2 were systemically characterized by N2 adsorption–desorption isotherms, thermogravimetric analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction measurements techniques. The analytical results indicated that the M-SiO2 was mainly composed of O and Si in the form of SiO2 with a specific surface area of 156 m2/g, and part of M-SiO2 exhibited a structure similar to MCM-41. Moreover, the mechanisms of EDA modification and CO2 adsorption were investigated and discussed in detail.

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“…Supercritical carbon dioxide (scCO 2 ) was also an eco-friendly medium. It could be gas-like or liquid-like by adjusting the temperature and pressure, so it was widely utilized in many chemical and biological processes. − Combining the ILs and scCO 2 as one medium has received much attention nowadays. − Brennecke et al used scCO 2 to extract low-volatility organic compounds such as naphthalene from ILs. The recoveries of organic could reach 94–96%. − That is because ILs could absorb plenty of CO 2 , but IL solubility in the organic and scCO 2 phase was negligible. − …”

Section: Introductionmentioning

confidence: 99%

Enhancement of a Double Cosolvent on Solubility of [Bmim][Ac] and [Bmim][NTf₂] in Supercritical CO₂

Xiang

Sun

et al. 2020

J. Chem. Eng. Data

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Solubility of 1-butyl-3-methylimidazolium bis-[(trifluoromethyl)sulfanilamide] ([Bmim][NTf 2 ]) and 1-butyl-3methylimidazolium acetate ([Bmim][Ac]) in supercritical carbon dioxide (scCO 2 ) using ethanol (EtOH) and ethylene glycol (EG) as a double cosolvent was measured at 40 °C and pressure from 8.0 to 15.0 MPa which was shown as the mole fraction of ionic liquids (ILs). The influence of ratios of EtOH to EG, pressures, concentrations of the cosolvent, and anions on enhancing the solubility of ILs in scCO 2 was investigated in this paper. The ability of the cosolvent with different ratios of EtOH to EG to enhance the solubility of [Bmim][Ac] followed the order y 1 /y 2 = 10:1 > y 1 / y 2 = 20:3 > y 1 /y 2 = 5:1 > y 1 /y 2 = 20:1. The maximum solubility of [Bmim][Ac] in scCO 2 was 5.6 × 10 −4 , which was about 30 times higher than its solubility using EtOH as a single cosolvent. The ability of the cosolvent with different ratios of EtOH to EG to enhance the solubility of [Bmim][NTf 2 ] followed the order y 1 /y 2 = 20:1 > y 1 / y 2 = 10:1 > y 1 /y 2 = 20:3. The maximum solubility of [Bmim][Ac] in scCO 2 was 2.4 × 10 −4 , about 1.5 times higher than its solubility using EtOH as a single cosolvent. The difference in ability to enhance solubility could be explained by solubility parameters. Finally, the modified Chrastil model, modified Meńdez-Santiago−Teja model, and modified Adachi−Lu model were employed to correlate the solubility data. The modified Chrastil model possessed the highest accuracy whose average absolute relative deviations were 2.88−7.06%.

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Impregnation of ionic liquids in mesoporous silica using supercritical carbon dioxide and co-solvent

Abstract: Impregnation of ILs on SBA-15 was successfully prepared in supercritical CO2. It was superior to the sample prepared using impregnation method.

Cited by 22 publications

References 30 publications

State of the art of ionic liquid‐modified adsorbents forCO₂capture and separation

State of the art of ionic liquid‐modified adsorbents forCO₂capture and separation

A Novel Mesoporous SiO₂ Material with MCM-41 Structure from Coal Gangue: Preparation, Ethylenediamine Modification, and Adsorption Properties for CO₂ Capture

Enhancement of a Double Cosolvent on Solubility of [Bmim][Ac] and [Bmim][NTf₂] in Supercritical CO₂

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Impregnation of ionic liquids in mesoporous silica using supercritical carbon dioxide and co-solvent

Abstract: Impregnation of ILs on SBA-15 was successfully prepared in supercritical CO2. It was superior to the sample prepared using impregnation method.

Cited by 22 publications

References 30 publications

State of the art of ionic liquid‐modified adsorbents forCO2capture and separation

State of the art of ionic liquid‐modified adsorbents forCO2capture and separation

A Novel Mesoporous SiO2 Material with MCM-41 Structure from Coal Gangue: Preparation, Ethylenediamine Modification, and Adsorption Properties for CO2 Capture

Enhancement of a Double Cosolvent on Solubility of [Bmim][Ac] and [Bmim][NTf2] in Supercritical CO2

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Product

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State of the art of ionic liquid‐modified adsorbents forCO₂capture and separation

State of the art of ionic liquid‐modified adsorbents forCO₂capture and separation

A Novel Mesoporous SiO₂ Material with MCM-41 Structure from Coal Gangue: Preparation, Ethylenediamine Modification, and Adsorption Properties for CO₂ Capture

Enhancement of a Double Cosolvent on Solubility of [Bmim][Ac] and [Bmim][NTf₂] in Supercritical CO₂