[Retracted] Experimental Investigation to Utilize Adsorption and Absorption Technique to Reduce CO₂ Emissions in Diesel Engine Exhaust Using Amine Solutions

Table 1

Properties of amines.

Properties	L-aspartic acid	L-alanine	L-arginine	Sodium hydroxide
Molecular formula	C4H7NO4	C3H7NO2	C6H14N4O2	NaOH
Appearance	Powder	Crystalline	Powder	Powder
Color	White	White	Colorless	White
pH at 25°C	2.7	5.6	11.24	12-13
pKa	1.88, 9.61	2.35,9.86	2.18, 9.08	13.7
Melting point (°C)	260	314	240	315
Boiling point (°C)	323	188	365	140
Density (g/cm^3)	1.662	1.422	1.662	2.11
Molecular weight (g/mol)	133.1	89.09	174.2	40.00