A Novel Synthesis Method of Porous Calcium Silicate Hydrate Based on the Calcium OxidePolyethylene Glycol Composites

Abstract EN

This paper proposed a novel method to prepare porous calcium silicate hydrate (CSH) based on the calcium oxide/polyethylene glycol (CaO/PEG2000) composites as the calcium materials.

The porosity formation mechanism was revealed via X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), Brunauer-Emmett-Teller (BET), and Fourier transformed infrared spectroscopy (FT-IR).

The reactivity of silica materials (SiO2) enhanced by increasing pH value.

Ca2+ could not sustain release from CaO/PEG2000 and reacted with SiO32− caused by silica to form CSH until the hydrothermal temperature reached to 170°C, avoiding the hardly dissolved intermediates formation efficiently.

The as-prepared CSH, due to the large specific surface areas, exhibited excellent release capability of Ca2+ and OH−.

This porous CSH has potential application in reducing the negative environmental effects of continual natural phosphate resource depletion.