Figure 7.
FTIR spectra of all coal samples (from top to bottom along the dotted line were the FTIR spectra of IL-untc, [N8,8,8,1]Cl-tc, [N2,2,2,2]Cl-tc, [C12MIm]Br-tc, [C14MIm]Br-tc, [HOEtMIm][BF4]-tc, and [HOEtMIm][NTf2]-tc).
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