The thermal analysis (TG-DTA) of raw pumice was found to be in accordance with XRF analysis, and showed that silica powder contains water molecules bonded physically and chemically to its surface by silanol groups via the hydrogen bond.
Thethermal analysis (TG-DTA) of raw pumice was found to bein accordance with XRF analysis, and showed that silicapowder contains water molecules bonded physically andchemically to its surface by silanol groups via the hydrogenbond.