Preparation of macroporous ion-exchange resin organic amine composite material by using waste plastics and its...

Two new types of solid adsorption material (macroporous cation exchange resin (MCER) and macroporous ion-exchange resin organic amine composite material (MCER-DEA)) were prepared from waste television plastics outer shell (WTPS) and used to capture CO₂ in flue gas from coal-fired power plants. The results showed that the CO₂ adsorption capacity of MCER-DEA was 2.87 mmol/g, while MCER was 1.87 mmol/g. The preparation mechanism and action mechanism of MCER and MCER-DEA was studied by Fourier transform infrared and quantum chemical calculations. The results showed that the electrophilic substitution occurs in between an H atom of meta position on the benzene ring and H₂SO₄. The electron energy of MCER-DEA was calculated to be 1.14 ev, indicating these MCERs formed acid-base coordination with diethanolamine (DEA). Besides, the electron energy of between MCER and CO₂ was 0.27 ev, and the interaction force was dominated by hydrogen bonds. The electron energy of the MCER-DEA and CO₂ was 3.02 ev, and the interaction force was mainly controlled by coordination bonds. It indicated that MCER and CO₂ were primarily based on physical adsorption, while MCER-DEA and CO₂ were mainly based on chemisorption adsorption. Adsorption kinetics studies showed that internal diffusion was a rate-controlling step.