前驱物沉淀法制备硅藻土/TiO2/TiOx的研究

Synthesis of Diatomite/TiO2/TiOx by pH Control Co precipitation Method

摘要:

采用溶胶 凝胶法将TiO2包覆在硅藻土(Diatomite)表面，并采用前驱物沉淀法制备包覆平整致密的硅藻土/TiO2/TiOx珠光颜料，探讨了pH值和煅烧温度对最终产物形貌的影响.结果表明：当溶液的pH值为5.0时，黑色钛氧化物颗粒细小，在珠光颜料表面分散比较均匀，包覆平整致密.650 ℃煅烧时，包覆粒子颗粒细小，包覆平整致密；700 ℃煅烧时，包覆平整致密，但包覆粒子尺寸较大.

Abstract:

TiO2 coated diatomite samples were prepared by sol gel method first, and then the Diatomite/TiO2/TiOx pearlescent pigments with uniform smooth and dense coating layer were prepared by precursor precipitation. The effects of pH and calcination temperature on the morphologies of the final Diatomite/TiO2/TiOx products were studied. The results show that when pH value of the solution is 5.0, black titanium oxide particles are small, well dispersed, and the pearlescent pigments have a smooth and dense coating layer of titanium oxides on their surface. When the calcination temperature is 650 ℃, the coating particles are still small, resulting in the smooth and dense coating layer of titanium oxides. However, when the calcination temperature is 700 ℃, coating layer is still smooth and dense, but the coating particles become large.