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CO2 adsorption profiles on layered double hydroxide (LDH)-based nanomaterials at different temperatures

https://doi.org/10.1186/s11671-018-2471-z

“CO2 adsorption performance of amine-modified LDHs was investigated by TGA at different testing temperatures. As it is shown in Fig. 7, CO2 adsorption amounts on APS/LDHs increased dramatically within the first 30 min, followed by a slow saturation stage. A CO2 adsorption capacity as high as 2.09 mmol/g during this saturation stage was obtained, much higher than that of LDHs (typically less than 1.0 mmol/g [29,30,31]). Therefore, the incorporated amino groups contributed to CO2 capturing significantly. It should be noted that APS/LDHs exhibited a CO2 adsorption amount of 1.55 mg/g at 25 °C while it showed a rather stable adsorption capacity at a temperature range from 30 to 75 °C. APS begins to react with CO2 from 28 °C [21]. Thus, the higher viscosity of APS at 25 °C would generate greater mass transfer limitation and further weaken its function for CO2 capturing.”

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