March 3, 2026ACS Materials Letters0 citations

Locking of CO 2 in a Bioinspired Porous-Organic-Polymeric Prison: Impact of Aliphatic Odd–Even Linker Combination

NDNitumani DasIndian Institute of Chemical Technology CBChandan BiswasIndian Institute of Chemical Biology SVSai V. C. VummaletiAgency for Science, Technology and Research

Key Points

LPOP-2 demonstrates the highest CO2 uptake at 3.50 mmol/g and 3.02 mmol/g at 273 K and 298 K, respectively, with notable selectivity.
Breakthrough experiments indicate LPOP-2's efficiency, showing a longer breakthrough time for CO2 compared to N2, crucial for practical applications.
Synthesis of allomelanin-inspired porous organic polymers (POPs) was conducted to enhance CO2 capture efficiency.
Density functional theory calculations reveal that noncovalent interactions play a key role in differentiating CO2 adsorption behaviors across the LPOP-n series.

Abstract

The critical need for better sorbents for CO2 capture and separation (CCS) is at the forefront of the current research scenario, which is addressed here by synthesizing allomelanin-inspired porous organic polymers (POPs) LPOP-n (n = 1–5). An investigation into the effect of different linkers on CO2 adsorption revealed an interesting performance trend, with LPOP-2 showing the highest CO2 uptake, 3.50 and 3.02 mmol/g at 273 and 298 K, respectively, with impressive CO2/N2 selectivity. Moreover, a dynamic breakthrough experiment revealed a longer breakthrough time for CO2 than that for N2, verifying the feasibility of LPOP-2 for its practical application in the CCS process. Density functional theory (DFT) calculations indicated that noncovalent interactions (NCIs), like π-quadrupole interaction and H-bonding, were crucial in dictating the varying CO2 adsorption behaviors across the LPOP-n series. This work underscores how simple materials originating from biologically active units can produce biocompatible materials for gas adsorption and separation applications.

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