Issue 80, 2015

Preparation of cage-like nano-CaCO3 hollow spheres for enhanced CO2 sorption

Abstract

Cage-like nano-CaCO3 hollow spheres with different cavity diameters for CO2 sorption were prepared using the template-directed synthesis method. Carbon sphere templates with different diameters were synthesized via a hydrothermal reaction of starch under variable conditions. Field emission scanning electron microscopy (SEM) and transmission electron microscope (TEM) images indicated that the synthesized cage-like nano-CaCO3 hollow spheres had different cavity diameters of 0.52 μm, 1.62 μm and 2.93 μm. The hollow sphere shells were composed of many uniform nanoparticles with diameters of approximately 80 nm, as supported by the X-ray diffraction (XRD) results. Furthermore, the CO2 sorption properties of the cage-like nano-CaCO3 hollow spheres were analyzed by thermo-gravimetric analysis (TGA). The sorption capacity of the optimum sample with a diameter of 1.62 μm reached the maximal theoretical value of 0.786 gCO2 gCaO−1 at 600 °C and exceeded the sorption capacity of the reference nano-CaCO3 sorbents by 45%. The sorption properties of the sample within the rapid reaction stage at the different temperatures of 550 °C, 600 °C and 650 °C were also evaluated. The results demonstrated that the sample exhibited a 30% higher sorption rate than nano-CaCO3. Therefore, cage-like nano-CaCO3 hollow spheres possess enhanced CO2 sorption capacity and higher sorption rates.

Graphical abstract: Preparation of cage-like nano-CaCO3 hollow spheres for enhanced CO2 sorption

Article information

Article type
Paper
Submitted
25 Jun 2015
Accepted
24 Jul 2015
First published
24 Jul 2015

RSC Adv., 2015,5, 65052-65057

Author version available

Preparation of cage-like nano-CaCO3 hollow spheres for enhanced CO2 sorption

H. Ping and S. Wu, RSC Adv., 2015, 5, 65052 DOI: 10.1039/C5RA12251A

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