Effect of the dispersion behavior of cerium oxygen species on CO2 adsorption performance.

The dispersion behaviors of metal oxygen species on the carrier surface have an important effect on the performances of them. The dispersion behaviors of cerium oxygen (CeO x) species on the surface of Canna indica L. based biochar are investigated via anchoring the different amounts of Ce(NO 3) 3 onto the surface of biochar by a hydrothermal reaction method. The dispersion behaviors are characterized by XRD, SEM, EDS. The effect of dispersive behavior on its own properties can be characterized by Raman, XPS and BET. The CO 2 adsorption performances of the different dispersive behaviors are detected by gas chromatography. Results showed that the dispersion behaviors of CeO x species on the biochar is affected by the molar ratio of CeO x species and biochar. In addition, the specific surface area, pore volume and average pore diameter of the composites, the interaction between with CeO x species and carrier biochar and the concentration of oxygen vacancy in CeO x species are all affected by the dispersion behaviors of the loaded CeO x species. Most importantly, the CO 2 adsorption performance of the composites are different duo to the different dispersion behaviors. CeO x -5/bio-C (the composite with the molar ratio of CeO x species and biochar is 5%) has the highest CO 2 adsorption performance and the adsorption capacity is 112.88 μmol/g CeO2. Therefore, the dispersion behavior of the CeO x species on the surface of the carrier has a great influence on its own properties and adsorption performance. [Display omitted] • CeO x -based composites were successfully prepared for CO 2 capture. • A CO 2 adsorption capacity of 112.88 μmol/g CeO 2 was attained at ambient condition. • Oxygen vacancies on the surface of CeO 2 promoted adsorption performance • Effect of dispersion behavior on the adsorption performance was discussed. • In situ adsorption property and adsorption mechanism of CO 2 on CeO x were proposed. [ABSTRACT FROM AUTHOR]