Abstract by ZHENG ZHOU
Chemistry and Biochemistry
Synthesis, Characterization, Carbon Dioxide Capture and Steam Stability of Covalently Grafted Amine Modified Multi-walled Carbon Nanotubes
Development of materials suitable for sustainable CO2 capture in the post combustion process is important for global CO2 reduction. Covalently grafted polyethyleneimine (PEI) modified multi-walled carbon nanotubes (MWCNT) are synthesized via the amination of acylated MWCNT. The material was analyzed with multiple characterization methods, while the covalent amide bonds were identified using X-ray photoelectron spectroscopy. Analysis with multiple linear regression indicated that surface area and total functional group loading were found to be the dominant factors that contributed to PEI loading. CO2 capture and stability of the material were evaluated under dry and steam conditions. The CO2 capture of materials under steam conditions was 1.12 mmol g-1, higher than that under dry conditions (0.98 mmol g-1). The PEI loading and MWCNT surface chemistry was stable under steam conditions in CO2 capture, while CO2 capture and PEI loading decreased by 77% and 33% respectively for the physisorbed PEI-MWCNT. The result indicates that supported amine materials with high stability and sustainability to humidity can be achieved via covalent grafting method.