Silica gel (SG) was synthesized via acidification of sodium silicate solution then doped with F ˉ or Zr(IV) in molar ratios of F/Si 3/100, and Zr/Si 0.75/100 and 3.75/100 and sintered at 500°C, 800 ° C and 1000 ° C. The samples were investigated by X-ray diffractometry, infrared absorption and Raman spectra, surface area measurement, and inductively coupled plasma - optical emission spectrometry - monitored silica hydrolysis. All samples are meso porous with BET surface areas 181.5 - 523.9 m 2 ·g ˉ 1 . The surface area of the silica samples decreases as the sin tering temperature increases. The hydrolysis process of silica decreases as the sintering temperature increases and as the surface area decreases. The pH and the type of buffer solution affect the hydrolysis of silica samples due to a SN 2 reaction mechanism favored in basic media using ammonia buffer. Zr(IV) increases the stability of silica samples against the hydrolysis as confirmed by the structural investigation, surface area and silica hydro lysis. F ˉ observably decreases the silica hydrolysis process when present ing on the surface of SG.
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