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Theoretical characterizations, and quantum chemical modeling (DFT and MCs) of waste plastic composites for CO2 capture and climate change mitigation

Food Safety and Health 2025
Doha E. Abdelsattar, Alaa Elaraby, Hamdy M. Naguib, Safinaz H. El‐Demerdash, E. G. Zaki, Asmaa B. El-Meligy

Summary

Researchers used DFT quantum mechanical calculations and Monte Carlo simulations to characterize the molecular and electronic structures of polyethylene, PVC, and PET, finding that these waste plastics could potentially enhance dicalcium silicate properties and improve CO2 capture efficiency.

B3LYP/6-311++g(d,p) quantum mechanical calculations were conducted to study the molecular structure, vibrational frequencies and electronic absorption spectra of polyethylene (PE), polyvinyl chloride (PVC) and polyethylene terephthalate (PET). The examined polymers were characterized experimentally and theoretically via FT-IR, Raman, UV–Visible and NMR spectra. From FMOs (Frontier molecular orbitals), the energy gap value, and electron density (ED) distribution analysis were carried out. Also, theoretical investigation was conducted on the examined PE, PVC, and PET to gather additional information regarding the correlation between their molecular and electronic structures and their capacity to enhance the properties of dicalcium silicate (C2S) and facilitate CO2 capture using DFT (Density Functional Theory) and MCs (Monte Carlo simulation).

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