【摘要】 采用搅拌共沉淀法,用表面活性剂CMC调控合成微米级CaCO₃微球。利用SEM、粒径分布、N2吸附/脱附测试、微球表面ζ电势、TGA对所得CaCO₃微球进行表征。探讨了CMC浓度、搅拌速率、搅拌时间对微球形貌的影响,优化制备工艺条件,搅拌速率2600 r×min^-1（15 min）,20℃静置60 min得CaCO₃（n）微球粒径为1.5～2.5μm,平均孔径为30 nm,比表面积为7.03 m²×g^-1,孔体积为0.09 cm³×g^-1,表面电荷为+12.6 mV;在CMC质量浓度为0.5 g×L-1,搅拌速率2600 r×min^-1（15min）,沉积温度20℃,沉积时间8h,得CaCO₃（CMC）微球中CMC量约为w=3.9%,粒径为3～5μm,平均孔径为3.84 nm,比表面积为44.0 m2×g^-1,孔体积为0.07 cm3×g^-1,表面电荷为-33.6 mV。结果表明,CMC的加入对CaCO₃微球的形貌、微结构和表面电荷起到调控作用。更多还原

【Abstract】 CaCO₃ micropaticles were synthesized by addition of carboxymethylcellulose（CMC） via stirring co-precipitation. The microparticles were characterized by SEM, size distribution measurement, N2 adsorption/desorption, zeta potential and TGA. Effects of CMC concentration, stirring speed, and stirring time on morphology were discussed and the conditions were optimized. Microparticles with size 1.5～2.5 mm, average pore diameter 30 nm, specific surface area 7.03 m²×g^-1, pore volume 0.09 cm3×g^-1 and surface charge +12.6 m V was prepared at the stirring speed of 2600 r×min^-1 for 15 min and standing for 60 min at 20 ℃ without CMC. When the CMC mass concentration was 0.5 g×L^-1 and prepared under stirring speed of 2600 r×min^-1 for 15 min and deposition temperature of 20 ℃ for 8 h, CaCO₃（CMC） microparticles containing w=3.9 % CMC are obtained with particle size, average pore size, specific surface area, pore volume and surface charge of 3～5 mm, 3.84 nm, 44.0 m2×g^-1, of 0.07 cm3×g^-1 and-33.6 m V, respectively. These results indicate that the morphology, microstructure and surface charge of CaCO₃ microparticles are affected by CMC.更多还原