Abstract
Mesoporous SrCO 3 spheres with diameter ranging from 200 to 400 nm were synthesized via refluxing the solution of SrCl 2 · 6H 2O and sodium hydroxide in 1,1,3,3-tetramethylguanidinium lactate at 140 °C in the presence of CO 2. The morphology and structure of the as-prepared products were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Nitrogen sorption measurements revealed that the obtained products exhibited high BET surface area of 69.4 m 2 g −1 and average pore size of 5.7 nm with narrow pore size distribution. For comparison, CaCl 2 was used to synthesize CaCO 3 at the same experimental conditions, resulting in hollow calcite spheres and peanut-like structure calcite whose shell thickness and core diameter were about 100 nm and 200 nm, respectively. The BET surface area of the hollow calcite spheres calculated from N 2 adsorption is 17.03 m 2 g −1.
Published Version
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