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Effect of critical micelle concentration of imidazole ionic liquids in aqueous solutions on the wettability of anthracite

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  • Wang, Hui
  • Xie, Jingna
  • Xie, Jun
  • Jiang, Hehe
  • Wen, Yongzan
  • Huang, Wanpeng
  • Wang, Gang
  • Jiang, Bingyou
  • Zhang, Chao

Abstract

In this study, the influence of ionic liquids (ILs) on the microstructure and wetting behaviour of anthracite is explored. 1H NMR and conductometry are used to determine the critical micelle concentration (CMC) for the aggregation of the ILs in an aqueous solution. XPS and zeta potential are used to analyse the changes in functional groups on the surface of coal treated with ILs and their effects on the wetting process. The results show that with an increase in the concentration of the ILs, the chemical shift of the end proton of the alkyl side chain moves forward to the high field, and the chemical shift value decreases. 1-Butyl-3-methylimidazolium chloride [Bmim][Cl] and 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4] in aqueous solution attain the CMC at 0.93 mol/L and 0.95 mol/L, respectively. XPS results show that at the CMC of [Bmim][Cl], the relative content of oxygen-containing functional groups (C–O―, CO, COO―) is higher, and the wetting effect is better. When the concentration of [Bmim][BF4] in aqueous solution is 0.5 mol/L, it has a low hydrophobic group (C–C/C–H) content and strong wetting ability to coal dust. At the CMC, [Bmim][Cl] aqueous solution has an inhibiting effect on the wetting behaviour, while [Bmim][BF4] has the opposite effect.

Suggested Citation

  • Wang, Hui & Xie, Jingna & Xie, Jun & Jiang, Hehe & Wen, Yongzan & Huang, Wanpeng & Wang, Gang & Jiang, Bingyou & Zhang, Chao, 2022. "Effect of critical micelle concentration of imidazole ionic liquids in aqueous solutions on the wettability of anthracite," Energy, Elsevier, vol. 239(PB).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pb:s0360544221023367
    DOI: 10.1016/j.energy.2021.122088
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    References listed on IDEAS

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    1. Lü, Hui-Fei & Xiao, Yang & Deng, Jun & Li, Da-jiang & Yin, Lan & Shu, Chi-Min, 2019. "Inhibiting effects of 1-butyl-3-methyl imidazole tetrafluoroborate on coal spontaneous combustion under different oxygen concentrations," Energy, Elsevier, vol. 186(C).
    2. Panchal, Balaji & Bian, Kai & Chang, Tao & Zhu, Zheng & Wang, Jinxi & Qin, Shenjun & Zhao, Cunliang & Sun, Yuzhuang, 2021. "Synthesis of Generation-2 polyamidoamine based ionic liquid: Efficient dendrimer based catalytic green fuel production from yellow grease," Energy, Elsevier, vol. 219(C).
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    4. Zhou, Yinbo & Zhang, Ruilin & Huang, Jilei & Li, Zenghua & Chen, Zhao & Zhao, Zhou & Hong, Yidu, 2020. "Influence of alkaline solution injection for wettability and permeability of coal with CO2 injection," Energy, Elsevier, vol. 202(C).
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    1. Gan, Jian & Wang, Deming & Xiao, Zhongmin & Wang, Ya-nan & Zhang, Kang & Zhu, Xiaolong & Li, Shuailong, 2023. "Experimental and molecular dynamics investigations of the effects of ionic surfactants on the wettability of low-rank coal," Energy, Elsevier, vol. 271(C).
    2. Li, Shugang & Yan, Dongjie & Yan, Min & Bai, Yang & Zhao, Bo & Long, Hang & Lin, Haifei, 2023. "Molecular simulation of alkyl glycoside surfactants with different concentrations inhibiting methane diffusion in coal," Energy, Elsevier, vol. 263(PB).

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