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

Abstract

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

CO2 Methanation on Nickel Catalysts Supported on Mesoporous High‐Surface‐Area MgSiO3

“…The synthetic magnesium silicate is a white powder with an amorphous structure and a high surface area . Magnesium silicate can be prepared by different methods such as hydrothermal method, laser ablation, condensation of gaseous phase to solid state, and sol‐gel method . Narasimharao et al prepared magnesium silicate by hydrothermal and sol‐gel methods and compared the structural properties of the synthesized sample.…”

“…Recently, synthesized magnesium silicate has been widely used in industries for catalysis and adsorption . The synthetic magnesium silicate is a white powder with an amorphous structure and a high surface area . Magnesium silicate can be prepared by different methods such as hydrothermal method, laser ablation, condensation of gaseous phase to solid state, and sol‐gel method .…”