前驱物沉淀法制备硅藻土/TiO_2/TiO_x的研究

Synthesis of Diatomite/TiO_2/TiO_x by pH Control Co-precipitation Method

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.

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.