N-Aminorhodanine modified chitosan hydrogel for antibacterial and copper ions removal from aqueous solutions

A novel adsorbent based on N-Aminorhodanine modified chitosan hydrogel was synthesized and evaluated for antibacterial and copper ions removal from aqueous systems. N-Aminorhodanine was reacted with glutaralde-hyde to yield Schiff base followed by reaction with chitosan to obtain the new hydrogel adsorbent. The new ad-sorbent was analyzed using FTIR, H-1 NMR, XRD, TGA, HR-SEM and EDX in addition to the swelling behavior. The maximum adsorption capacities of chitosan and modified chitosan for copper ions were 38 and 62.5 mg/g respec-tively. The adsorption isotherm belongs Freundlich model and pseudo second order kinetics regime. The adsorp-tion was reach to maximum within 15 min for modified chitosan hydrogel while take about 360 min for chitosan. Regeneration of adsorbent showed only 23% decline after 6 cycles which indicate the stability of the new adsor-bent and it can be reused several times with good efficiency. N-Aminorhodanine modified chitosan hydrogel showed good activity towards gram positive bacteria. (C) 2020 Elsevier B.V. All rights reserved.