# Ionic Liquids Hybridization for Carbon Dioxide Capture: A Review
## 6 Conclusions  
Research related to ILs utilization for CO\({}_{2}\) capture has been ongoing for more than two decades. Based on preceding discussions, the research landscape surrounding utilization of ILs as sorbents for CO\({}_{2}\) capture is continuously advancing with a wide array of different classes of ILs being synthesized and studied. In general, ILs have undergone various structural modifications in which each class was developed to address the limitations of the earlier generation of ILs. To further enhance ILs performance, a new method known as ILs hybridization was proposed with the ultimate goal of developing sustainable solutions for CO\({}_{2}\) capture. Absorbent mixtures containing ILs/amine blending exhibit lower viscosity and better thermal stability compared to the pristine materials. Besides that, the addition of amine into IL has significantly improved the CO\({}_{2}\) absorption capacity. The incorporation of ILs into amines also reduces the energy requirements during the CO\({}_{2}\) desorption and absorbent regeneration process. Meanwhile, the incorporation of ILs into porous materials such as activated carbon, mesoporous silica and MOF has led to pore blocking, thus resulting in a reduction in the adsorbent's surface area. As the gas adsorption performance is highly dependent on the total surface area, the presence of ILs within the pores of porous materials leads to a significant reduction in CO\({}_{2}\) adsorption capacity. However, the selectivity of adsorbent towards CO\({}_{2}\) increases compared to pristine material. In the case of ILs/cellulose hybrid material, the morphology of cellulose has been altered after the introduction of ILs. While the IL/cellulose combination exhibits good CO\({}_{2}\) solubility, ILs anions do still play a significant role in determining the overall adsorption capacity. In the meantime, the utilization of cellulose as solid support has also significantly reduced the ILs amount usage in CO\({}_{2}\) capture. On top of that, among the various ILs hybrid materials discussed in the previous section, IL/cellulose emerges as a particularly promising candidate for industrial-scale applications. Its potential is underscored not only by its promising performance towards CO\({}_{2}\) capture, but also by the abundant availability of lignocellulosic biomass which serves as the primary source of cellulose. This approach not only mitigates environmental concerns linked to biomass waste disposal, but also presents a sustainable and viable solution. Additionally, the blending of amine/ILs also holds significant promise for the industry. The technology involving the use of amines as CO\({}_{2}\) absorbents has been well-developed and extensively studied. Incorporating ILs into amine solutions offers a cost-effectivesolution, potentially eliminating the need for extensive modifications to existing CO2 capture infrastructure to accommodate the blended mixture. ILs hybridization offers a promising approach to overcome ILs' main limitation, which is viscosity. Through various processes of ILs hybridization, such as blending, encapsulation and immobilization, novel ILs hybrid material with better stability, selectivity and functionality for CO2 capture has been produced. Additionally, hybridization not only enhances the properties of the individual ILs, but also contributes to the improvement of the pristine material's properties. However, several recommendations have been suggested to improve the research for its potential application at industrial scale. Current study focuses on lab-scale production of hybrid materials. Therefore, comprehensive study on developing IL hybrid material that are compatible with the existing system of CO2 capture is required. Concurrently, it is recommended to conduct a study related to the environmental implications of employing ILs hybrid materials, with particular emphasis on the characterization of degradation products and the development of effective waste management strategies.