Preparation of mesostructured barium sulfate with high surface area by dispersion method and its characterization

Abstract

The spherical and cubic mesoporous BaSO 4 particles with high surface area were successfully produced via one-step process through precipitation reaction in aqueous solution of Ba(OH) 2 and H 2SO 4 with ethylene glycol ( n-HOCH 2CH 2OH) as a modifying agent. The BaSO 4 nanomaterial revealed that the high surface area and the mesoporous was stable up to 400 °C. Agglomerate mesoporous barium sulfate nanomaterials were obtained by the reaction of Ba 2+ and SO 2− 4 with ethylene glycol aqueous solution. The ethylene glycol was used to control the BaSO 4 particle size and to modify the surface property of the particles produced from the precipitation. The dried and calcined mesoporous BaSO 4 nanomaterials were characterized by X-ray diffraction (XRD), BET surface area and N 2 adsorption–desorption isotherm, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared resonance (FTIR) and thermogravimetric analysis (TGA). The as-prepared mesoporous dried BaSO 4 possesses a high BET surface area of 91.56 m 2 g −1, pore volume of 0.188 cm 3 g −1 ( P / P 0 = 0.9849 ) and pore size of 8.22 nm. The SEM indicates that the morphology of BaSO 4 nanomaterial shows shell like particles up to 400 °C, after that there is drastically change in the material due to agglomeration. Synthesis of mesoporous BaSO 4 nanomaterial is of significant importance for both sulphuric acid decomposition and oxidation of methane to methanol.