化学沉淀法制备CaCO3/TiO2复合粒子研究  

Study on preparation of CaCO/TiO composite particles by chemical precipitation

作　　者：周万鹏 马妙莲 Zhou Wanpeng;Ma Miaolian(National Center of Quality Supervision&Inspection on Xuan Paper and Calligraphy Supplies,Xuancheng 242000;School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230000)

机构地区：[1]国家宣纸及文房用品质量监督检验中心,宣城242000 [2]合肥工业大学化学与化工学院学院,合肥230000

出　　处：《化工新型材料》2020年第8期177-180,共4页New Chemical Materials

摘　　要：利用化学沉淀法制备CaCO3/TiO2复合粒子,直接将CaCO3加入水中配制CaCO3浆料,再将事先配制好的钛酸四丁酯前驱体溶液滴加到CaCO3浆料中,水解成核生长,得到CaCO3/TiO2复合粒子。结果表明:CaCO3/TiO2复合粒子表面粗糙,存在大量、排列致密的,粒径约为5~8nm的TiO2微粒;当CaCO3浆液浓度为10g/L,配制的钛酸四丁酯溶胶发生部分水解反应[n(H2O)∶n(Ti(OC4H9)4)=2∶1],CaCO3与TiO2质量比为1g∶0.75g时,反应2h条件下得到的复合粒子在邻苯二甲酸氢钾-氢氧化钠缓冲溶液中溶出的Ca^2+浓度最小,耐酸性能最好。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 5~8 nm.When the concentration of the calcium carbonate slurry was 10 g/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 1 g∶0.75 g,and the reaction for 2 h,the wanted composite particles were obtained.The dissolved Ca^2+concentration of the composite particles in the potassium hydrogen phthalate-sodium hydroxide buffer solution was the smallest,and the acid resistance was the best.

关 键 词：碳酸钙 二氧化钛 复合粒子 

分 类 号：TB332[一般工业技术—材料科学与工程]