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Updated: Jan 24, 2026
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Effect of Ionic Liquid Surfactants on Coal Oxidation and Structure
Weiqing Zhang1, Shuguang Jiang1,2, Tong Qin3
1State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China.
Journal of Analytical Methods in Chemistry
|May 31, 2019
Summary
Six ionic liquids were tested for their ability to inhibit coal oxidation. The study found that [HOEtMIm][BF4] and [HOEtMIm][NTf2] were most effective at reducing coal oxidation due to their surface activity and thermal stability.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Coal oxidation presents challenges in handling and storage.
- Ionic liquids (ILs) are being explored for their potential to modify coal properties.
Purpose of the Study:
- To investigate the effects of six surfactant-type ionic liquids on coal oxidation characteristics and functional groups.
- To identify ILs that can effectively inhibit coal oxidation.
Main Methods:
- Critical micelle concentration and surface tension measurements.
- Thermogravimetric analysis (TGA) and temperature-programmed oxidation (TPO).
- Fourier transform infrared spectroscopy (FTIR) for functional group analysis.
Main Results:
- Ionic liquids, except [N2,2,2,2]Cl, exhibited favorable surface activity.
- [HOEtMIm][BF4] and [HOEtMIm][NTf2] showed high thermal stability and effectively inhibited coal oxidation.
- IL treatment altered the content of hydrogen bonds, aliphatic, and aromatic groups in coal.
Conclusions:
- [HOEtMIm][BF4] and [HOEtMIm][NTf2] are promising for inhibiting coal oxidation due to their superior surface activity and thermal stability.
- The effectiveness of ILs in coal oxidation inhibition is linked to their chemical structure and physical properties.
- Ionic liquid treatment can modify coal's functional groups, impacting its oxidation behavior.
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