The chemical precipitation method was used to prepare CaCO3/TiO2 composite particles.Calcium carbonate was directly added to water to prepare a calcium carbonate slurry,and the previously prepared tetrabutyl titanate precursor solution was added dropwise to the calcium carbonate slurry.In the process,hydrolysis and nucleation grown to obtain CaCO3/TiO2 composite particles.The results shown that the surface of the CaCO3/TiO2 was rough,there were a large number of TiO2 particles with a dense particle size of about 5~8nm.When the concentration of the calcium carbonate slurry was 10g/L,the tetrabutyl titanate sol was partially formed: the hydrolysis reaction [n(H2O):n(Ti(OC4H9)4)=2:1].The mass ratio of calcium carbonate to titanium dioxide was 1g:0.75g,and the reaction for 2h,the wanted composite particles were obtained.The dissolved Ca2+ concentration of the composite particles in the potassium hydrogen phthalate-sodium hydroxide buffer solution was the smallest,and the acid resistance was the best.
Zhou Wanpeng, Ma Miaolian
. Study on preparation of CaCO3/TiO2 composite particles by chemical precipitation[J]. New Chemical Materials, 2020
, 48(8)
: 177
-180
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.08.039
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