Work

Characterization and SO2 Sorption Performance of Zn3[OAc]8[C2mim]2, a Metal-Based Ionic Liquid

Year: 2025

Type: article

Abstract: The metal-containing ionic liquid, Zn3[OAc]8[C2mim]2, was synthesized, characterized, and incipiently impregnated onto the high-surface-area, nanoporous coconut-shell-activated carbon to evaluate its potential for acidic gas capture using SO2 as the probe gas molecule. The Zn3[OAc]8[C2mim]2-impregnated sorbents were tested for SO2 sorption performance under a simulated polluted air environment of 10 ppm of SO2, relative humidity of 50%, and a temperature of 28 °C relevant to fuel cells. Surprisingly, the 5 wt % Zn3[OAc]8[C2mim]2 sorbent had the highest SO2 breakthrough performance compared to the 10 wt %, as well as the pure activated carbon. The material properties were elucidated by using FTIR, TGA, DSC, SEM, and EDS techniques. The absorption of SO2 was directly confirmed as S–O vibrations at 1100 cm–1 in ATR-FTIR spectra and sulfur peaks in EDS. The results clearly indicate that metal-containing ionic liquids are good candidates for practical acidic gas mitigation at low contaminant concentrations in the future.

Source: ACS Omega

DOI: 10.1021/acsomega.4c11605

Authors: Isabella Kotsol, Godwin Severa

Institution: University of Hawaiʻi at Mānoa

Language: English

Topic: Industrial Gas Emission Control

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,935

Funder: Office of Naval Research