# Adsorption Application of Choline Chloride Modified MIL-101 (Cr) in Carbon Capture and Storage

## TL;DR

This paper presents a new method to enhance CO2 adsorption using choline chloride-modified MIL-101(Cr) for carbon capture.

## Contribution

A one-step modification of MIL-101(Cr) with choline chloride significantly improves CO2 adsorption capacity and material stability.

## Key findings

- 0.075-ChCl-MIL-101(Cr) showed a 61.191% increase in CO2 adsorption capacity.
- The modified material had a regeneration loss rate below 4%.
- Langmuir and Freundlich isotherms showed non-uniform surface bonding.

## Abstract

This study developed a new way of designing choline chloride-modified MOF-based materials with advanced gas adsorption properties. To design better carbon capture materials, MIL-101 (Cr) was prepared using the hydrothermal method, and then was modified with different concentrations of choline chloride in a one-step method to enhance its CO2 adsorption capacity. The characterization and experimental results indicated that the modified ChCl-MIL-101(Cr) significantly enhanced the adsorption capacity for CO2. Specifically, the 0.075-ChCl-MIL-101(Cr) showed a 61.191% increase in adsorption capacity compared to that of the raw material. Moreover, the regenerated adsorption loss rate of the modified material was below 4%, proving the permanence of the material synthesis. Simulating isotherms using Langmuir and Freundlich equations revealed the non-uniformity of surface bonding.