Abstract
In order to investigate the influence of synthesis methods on the CO2 adsorption capacity of Mg3Al-CO3 hydrotalcite (HT) derived adsorbents, six different synthesis methods were evaluated in this paper. We demonstrated that synthesis methods had great effect on the adsorption capacity of CO2. The HT samples synthesized from Na2CO3 as precipitating agent all had much higher CO2 adsorption capacity than those from urea. However, with the same precipitating agent, the aging conditions (e.g., room temperature, hydrothermal, or microwave, etc.) had little effect on the final CO2 adsorption capacity. The effect of adding surfactant such as cetyl trimethylannmonium bromide during the synthesis of HTs was also been studied. The results indicated that more regular plate-like nanoparticles with unique lateral size of ca. 200-300 nnn. Although different HT samples possessed different morphologies, no correlation can be found between morphology and CO2 capture capacity. According to this study, it is believed that the main probably influencing factor is the charge compensating anion.