Layered double hydroxides (LDHs) are positively charged layered hydroxide compounds that has been found capable of carbon dioxide (CO2) adsorption ranging from ambient temperature up to 400°C. The purpose of the research is to identify different modifications and configurations of LDHs and their derived oxides which could maximize the adsorption capacity of CO2. Modifications of LDH such as the attachment of polyethylenimine (PEI) on LDH surface and the deposition of thin carbon layer by hydrothermal synthesis in the present of glucose are explored. It is believed that different treatment and modifications would affect the overall structure and affinity of the LDH particles towards CO2. Adsorption tests are performed by using thermal gravimetry analysis under pure CO2 environment at atmospheric pressure and different temperatures ranging from 40oC to 240oC. So far, it was found that the adsorption capacity of up to 0.86 mmol CO2/gram was obtained with the carbon coated LDHs at 40oC. The structure of LDH and composition of the LDH and modifiers are further investigated and analysed with the aid of X-Ray Diffraction Analysis (XRD) and a Scanning Electron Microscope (SEM).

Synthesis and modification of layered double hydroxides with carbon-based materials for CO2 adsorption

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