Synthesis and Characterization of Chitosan-Schiff‑Bases as absorbent bio-polymers forCopper(II) Ion in Aqueous solution

In this paper, four modified chitosan compounds were prepared by reaction between chitosan (CS)and carbonyl groups such as salicylaldehyde (SA), benzaldehyde (BA), para-chloro benzaldehyde (PCBA) andacetanilide (A) as an amide compound. The corresponding Schiff-bases were characterized by FTIR, EDX,FESEM, BET and TGA-DTA techniques. The BET analysis on the prepared Schiff bases shows that the totalvolume of the pores and their specific surface area is different. The synthesized compounds have got less than۱۰ nm in diameter. The adsorption of copper ion in the aqua medium by prepared Schiff bases was studied. Acomparison of the adsorption percentage of prepared compounds indicates that Schiff-base CS-A has slightlybetter adsorption than CS-SA. The adsorption efficiency of Cu۲+ per molar unit changes as: CS-A (۹۲.۵%) > CSSA(۸۰.۴%) > CS-BA (۴۳.۲%) > CS-PCBA (۴۲.۲%) > CS (۳۰.۵%).

کلیدواژه ها:

Chitosan ، Schiff-base ، Adsorption ، Copper(II) ، ·Biopolymer