Adsorption of carbon dioxide on 3-aminopropyl-triethoxysilane modified graphite oxide

An awareness of the seriousness and symptoms of global warming is encouraging the development of technologies designed to reduce the emissions of CO₂, a representative greenhouse gas, which contributes to global warming. The reduction of CO₂ emissions has become a major environmental concern, and various methods such as absorption, adsorption, and membrane separation have been employed in CO₂ capture. In recent times, technology designed to capture CO₂ by adsorption has received considerable attention due to its low energy consumption and easy regenerability. In this study, 3-aminopropyl-triethoxysilane modified graphite oxide (Gr-APTS) was synthesized via the functionalization of graphite oxide (GO) with amine molecules for the development of a new CO₂ adsorbent. GO was prepared to hold extensive oxygen-containing functionalities through oxidizing graphite with highly concentrated acid. Then, the amine molecules were grafted onto the surface of the GO, which provided an enhancement of the CO₂ affinity and increased the CO₂ adsorption uptake at a temperature of 30 C and a pressure of ∼1 atm. Gr-APTS also showed a highly stable CO₂ adsorption uptake in the adsorption/desorption cycles.