Fig. 4: Hydrochar characterization from the DTPH reaction in H2O and D2O.
a FTIR spectra. The stretching vibration band of aromatic C−D is beyond the range of the FTIR (<450 cm−1). b 1H NMR spectra. Reaction conditions: 200 °C, 20 MPa. c Solid product from the hydrothermal process of different substrates at 200 °C and 20 MPa.
