Hydrothermal Synthesis Of Tobermorite Doped With Phosphorus Species For Removing Heavy Metal Ions

A new type of tobermorite for removing heavy metal ions in waste water was prepared by hydrothermal treatment of slurries containing quartz, calcium hydroxide and disodium hydrogen phosphate. X-ray diffraction and X-ray fluorescence analysis showed that tobermorite with a high Ca/Si molar ration is formed and contains phosphate species after the treatment. The incorporation of phosphate species in tobermite induced the increase in the amount of Ca2+ ions. Tobermite containing phosphate species showed a higher heavy metal ion adsorption capacity than tobermite without phosphate.