Physical and Adsorptive Characterization of Precipitated Magnesium Silicate from Rice Hull Ash Silica

✍ Scribed by P. Sayan; S. Titiz-Sargut; S. Ozgul-Yucel; B. Kiran

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 420 KB
• Volume: 34
• Category: Article
• ISSN: 0930-7516
• DOI: 10.1002/ceat.201000478

✦ Synopsis

Precipitation of magnesium silicate from sodium silicate and MgCl 2 and MgSO 4 solutions was investigated at four different reactant feed rates and two temperatures (25 °C and 50 °C). Sodium silicate solutions were produced from rice hull ash silica. The final product was characterized by scanning electron microscopy, X-ray diffraction, thermogravimetric analysis/differential thermal analysis, crystal size distribution, and filtration rate measurements. Physical characteristics of the studied magnesium silicates were determined by the Brauner-Emmett-Teller method and their adsorption capacities were compared to commercial magnesium silicate (Florisil). The adsorption was spontaneous and endothermic. The best fit of the kinetic results was achieved by a pseudo-second-order equation. The equilibrium data were found to be well represented by the Freundlich isotherm equation.