Design, synthesis, and physicochemical study of a biomass-derived CO2 sorbent 2,5-furan-bis(iminoguanidine)

Qianzhong Zhang,Yi Jiang,Yinwu Li,Xianheng Song,Xiang Luo,Zhuofeng Ke,Yong Zou

doi:10.1016/j.isci.2021.102263

Abstract

SummaryIn this study, the concept of biomass-based direct air capture is proposed, and the aminoguanidine CO2 chemical sorbent 2,5-furan-bis(iminoguanidine) (FuBIG) was designed, synthesized, and elucidated for the physicochemical properties in the process of CO2 capture and release. Results showed that the aqueous solution of FuBIG could readily capture CO2 from ambient air and provided an insoluble tetrahydrated carbonate salt FuBIGH2(CO3) (H2O)4 with a second order kinetics. Hydrogen binding modes of iminoguanidine cations with carbonate ions and water were identified by single-crystal X-ray diffraction analysis. Equilibrium constant (K) and the enthalpies (ΔH) for CO2 absorption/release were obtained by thermodynamic and kinetic analysis (K7 = 5.97 × 104, ΔH7 = −116.1 kJ/mol, ΔH8 = 209.31 kJ/mol), and the CO2-release process was conformed to the geometrical phase-boundary model (1-(1-α)1/3 = kt). It was found that the FuBIGH2(CO3) (H2O)4 can release CO2 spontaneously in DMSO without heating. Zebrafish models revealed a favorable biocompatibility of FuBIG.

Highlights

The heavy reliance and massive consumption of fossil resources in modern society has caused continuous rising of atmospheric CO2 concentration and resulted in an alarming change of global climate (Cox et al, 2020; Davis et al, 2018; Anderson et al, 2018; Jin et al, 2020)
The FuBIG showed an improved aqueous solubility (0.4029 M, 25C) than PyBIG (0.0012 M, 25C), and when the aqueous solution of FuBIG was left open to ambient air for a few days, the formation of prism shaped, yellowish-brown single crystals was found, which was consistent with the composition of a tetrahydrated carbonate FuBIGH2(CO3) (H2O)4 by Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), and single-crystal X-ray diffraction analysis (CCDC: 2038310, Table S1, Figures S8 and 2A)
Single-crystal X-ray diffraction analysis of FuBIGH2(CO3)(H2O)4 displayed that the hydrogen bonding between FuBIG, CO2, and heat capacity of FuBIGH2(CO3) (H2O)

Summary

Introduction

The heavy reliance and massive consumption of fossil resources in modern society has caused continuous rising of atmospheric CO2 concentration and resulted in an alarming change of global climate (Cox et al, 2020; Davis et al, 2018; Anderson et al, 2018; Jin et al, 2020). Solid-supported amine-based sorbents are solid adsorbents which incorporate amine moieties into solid supports including zeolites, carbons and organic resins, etc (Thakkar et al, 2017; Pang et al, 2017; Holewinski et al, 2017; Sarazen and Jones, 2017). These adsorbents offer advantages such as high selectivity for CO2 and relatively low cost, but they displayed lower CO2 capacities compared to other sorbents.

Methods

Results

Conclusion