Deep eutectic solvent-modified hydrotalcite for carbon dioxide capture: A new generation of hybrid sorbents
			
	
 
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				Chemical Engineering Department, College of Engineering, University of Diyala, Baquba, Diyala,  Iraq
				 
			 
										
				
				
			
			These authors had equal contribution to this work
			 
		 		
				
		
		 
			
			
		
		
		
		
		
		
	
							
										    		
    			 
    			
    				    					Corresponding author
    					    				    				
    					Ahmed Daham Wiheeb   
    					Chemical Engineering Department, College of Engineering, University of Diyala, Baquba, Diyala,  Iraq
    				
 
    			
				 
    			 
    		 		
			
							 
		
	 
		
 
 
 
 
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ABSTRACT
The critical demand for effective CO₂ capture methods is highlighted by the mitigation of greenhouse gas emissions, particularly CO₂. This is indicative of their significant influence on human well-being and global ecosystems, as well as their essential involvement in climate change. The adsorption method is a popular technique for capturing and storing CO₂. This technique demands the use of an adsorbent, one of which is hydrotalcite (HT). The impregnation of HT with deep eutectic solvents (DES) can improve its adsorption capacity. In this study, a DES composed of choline chloride (ChCl) and monoethanolamine (MEA) at a mole ratio of 1:4 was used to modify the prepared HT by the combustion-recrystallization (HTR)-impregnation (HTI) procedure employing aluminum and magnesium nitrate precursors and carbonate solutions with a 20 wt.% DES loading. Comprehensive characterization was carried out through Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscope (FESEM), and Energy-Dispersive X-ray (EDX) analysis to identify the deviations in covalent chemical bonds of molecules, surface morphology, and elemental composition of the prepared adsorbents. The FTIR results confirmed interactions between DES functional groups and the hydroxyl layers of hydrotalcite, while SEM and EDX analyses revealed surface modification and changes in elemental composition. Remarkably, the impregnated HTI with DES exhibited a good CO₂ adsorption capacity of 0.46 mmol/g at room temperature and 1 bar. Furthermore, a remarkable recyclability validates the potential of DES-impregnated hydrotalcites for advanced CO₂ capture applications.