Syntheses of D-glucamine and N-methyl-D-glucamine modified chitosan for boron adsorption

Abstract

Two types of biodegradable chitosan-base boron adsorbents were synthesized by introducing D-glucamine and N-methyl-D-glucamine functional groups. Structural analysis was carried out using 1H-NMR. The maximum boron adsorption values were 3.5 mg g[Formula: see text] (equilibrium concentration, [Formula: see text] ppm), and 7.3 mg g[Formula: see text] ([Formula: see text] ppm) for D-glucamine and N-methyl-D-glucamine type chitosan adsorbents, respectively. The obtained boron adsorption capacity of N-methyl-D-glucamine modified chitosan was found to be 7.3 mg g[Formula: see text] ([Formula: see text] ppm) higher than that of the boron absorbent Amberlite IRA743. Thus, the biodegradable [Formula: see text]-methyl-D-glucamine-modified chitosan synthesized in this study is expected to be useful as a commercial product.