pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

摘要

Titanium phosphates were prepared from titanium chloride and sodium pyrophosphate at various pH in hydrothermal process as a novel white pigment for cosmetics.Their chemical composition,powder properties,photo catalytic activity,colour phase and smoothness were studied.The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide.The samples prepared at pH=4 had particles smaller than 100μm.Titanium phosphates had less photo catalytic activity to protect the sebum on the skin.The obtained materials in hydrothermal process and their thermal products at 100°Cshowed high reflectance in the range of visible light.