The intensity of bands related to O–Si–O bond bending vibration, symmetric stretching vibrations of the Si–O–Si(Al) bridges,
anti symmetric stretching vibrations Si (Al)–O of GBFS activated by SH (I) is higher than those of GBFS-NC14 (B) while
the intensity of bands related to bending H–O–H vibration, and stretching of O–H groups of GBFS-NC14 is higher than
those of GBFS activated by SH.