Mechanisms of Phosphate Removal by Synthesized Calcite

摘要

Calcite was synthesized through different drying processes and characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). By bath experiments, the mechanisms of phosphate removal by synthesized calcite were investigated. It appears that synthesis calcite has a strong capacity to remove phosphate from solution. The adsorption of phosphate mainly depends on total concentration of phosphate and pH in solution. Magnesium favors the phosphate adsorption during pH range of 8-13.5; while inhibits the adsorption at around pH 7. The experimental results suggest that the synthesized calcite with aged process can be used effectively as an adsorbent to remove phosphate from an alkaline aqueous solution.