Work

Functionalization of Ti3C2 MXene with cholinium amino acid ionic liquids for enhanced CO2 adsorption performance

Year: 2025

Type: article

Abstract: The 2D structure and unique properties of MXenes have attracted significant research interest. In this study, Ti 3 C 2 MXene was functionalized with cholinium amino acid ionic liquids ([Cho][AA]s) to synthesize IL@Ti 3 C 2 MXene, aiming to expand interlayer spacing, enhance surface functionality, and improve CO 2 adsorption performance. The modification effectively increased the interlayer spacing, facilitating superior adsorption properties compared to pristine Ti 3 C 2 MXene. The IL@Ti 3 C 2 MXene composites were characterized using X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Raman Spectroscopy, Scanning Electron Microscopy (SEM) with Energy-Dispersive X-ray Spectroscopy (EDX), and Brunauer–Emmett–Teller (BET) surface area analysis, while CO 2 adsorption was evaluated via Quartz Crystal Microbalance (QCM) at 288.15–308.15 K and pressures up to 1 bar. Adsorption isotherms followed the Langmuir model, suggesting a predominant chemisorption mechanism involving amine functionalities. At 298.15 K and 1 bar, Ti 3 C 2 MXene exhibited a CO 2 adsorption capacity of 1.95 mmol/g, while IL@Ti 3 C 2 MXene composites displayed enhanced adsorption: [Cho][Arg]@Ti 3 C 2 (3.25 mmol/g), [Cho][His]@Ti 3 C 2 (2.92 mmol/g), and [Cho][Tyr]@Ti 3 C 2 (2.64 mmol/g). These improvements were resulted from electrostatic interactions, hydrogen bonding, Lewis acid–base interactions, and interlayer expansion. The exothermic nature of adsorption, confirmed by negative enthalpy (ΔH) values, indicates an energetically favorable process.

Source: Scientific Reports

DOI: 10.1038/s41598-025-29529-7

Authors: Narmin Noorani, Abbas Mehrdad

Institution: University of Tabriz

Language: English

Topic: Carbon Dioxide Capture Technologies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Climate action

Open Access status: gold

Estimated APC paid: $2,690