Fig. 8
High resolution X-ray photoemission C 1s spectra of F71A29 a before and b after CaCl2 treatment. ATR-FTIR spectra of F71A29 c before and d after CaCl2 treatment. TG, DTG and DTA curves of F71A29 e before and f after CaCl2 treatment carried out in air atmosphere with heating speed 10 °C/min