Preparation of macroporous ion-exchange resin organic amine composite material by using waste plastics and its application in CO₂ capture

ABSTRACT

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.

GRAPHICAL ABSTRACT

KEYWORDS:

• Solid adsorption material
• capture of CO₂
• recycling of waste plastic
• quantum chemical calculations
• adsorption kinetics

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

All data, models, and code generated or used during the study appear in the submitted article.

Additional information

Funding

This work was supported by Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [grant number 2021-K20]; National Natural Science Foundation of China [grant number 21706141].