Study of biopolymer modified with arginine for CO₂ adsorption

Abstract

Biopolymer was modified with arginine for carbon dioxide adsorption study. Biopolymer was reacted with arginine in 2-(N morpholino) ethane sulfonic acid sodium salt solution (MES solution) of l-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC.HCl) and N-hydroxysulfosuccinimide sodium salt (sulfo-NHS). The effects of the ratios of the coupling agents to biopolymer, ratios of arginine to biopolymer, and reaction time were studied. The degree of substitution was determined by high-performance liquid chromatography (HPLC) and the functional groups of the biopolymer-arginine composite were detected by Fourier transform infrared spectroscopy (FT-IR). The most suitable ratio of coupling agents to biopolymer was 1:1, which give the highest degree of substitution (%DS) as compared with the ratios of 2:1 and 3:1. The most suitable reaction time was 72 hours as compared with 24 hours and 48 hours. The effect of arginine ratio was to vary the ratio of arginine to biopolymer as 1:1, 2:1 and 3:1. The ratio of biopolymer to arginine at 1:1 give the most suitable %DS. The obtained material was used as an adsorbent for a CO2 adsorption study.