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Attenuated Total Reflection (ATR) spectra of raw and (a) thermal treatment (TT) at 120 °C for 1 h and acid (H2SO4, H3PO4, HCl) pretreatment, at the concentration of 20 g/100 gTS; (b) TT at 80 °C for 24 h and alkali (NaOH) pretreatment at the concentration of 20 g/100 gTS, respectively.
