Abstract
Biomacromolecule have a significant contribution to the adsorption of metal ions. Moreover, chitosan is one of the most studied biomacromolecule, which has shown a good performance in the field of wastewater treatment. In this context, a new adsorbent of the aminophosphonic modified chitosan-supported Ni(II) ions type was prepared from the naturally biopolymer, chitosan. In the first step, modified chitosan with aminophosphonic acid groups was prepared using the “one-pot” Kabachnik-Fields reaction. It was characterized by different techniques: FTIR, SEM/EDAX, TGA, and 31P-NMR. In the second step, the modified chitosan with aminophosphonic acid was impregnated with Ni(II) ions using the hydrothermal reaction at different values of pH (5, 6 and 7). The physical-chemical characteristics of final products (modified chitosan carrying aminophosphonic groups and Ni(II) ions) were investigated using FTIR, SEM images, EDAX spectra and thermogravimetric analysis. In this work, the most important objective was the investigation of the adsorbent performance of the chitosan modified with aminophosphonic groups and Ni(II) ions in the process of removing Pb(II) ions from aqueous solutions by studying the effect of pH, contact time, and Pb(II) ions concentration. For removal of Pb(II) ions from the aqueous solution, the batch adsorption method was used.
Highlights
Chitosan is derived from natural sources, such as insects’ skeletons, crustaceans and fungi that act to be biocompatible and biodegradable [1,2]
The present paper mainly focuses on the chemical modification of chitosan with 1phosphonopropyl groups (α-aminophosphonic acid groups) and nickel ions and its adsorption performance
These results suggest the interactions between Ni and chitosan, which lead to obtaining an amorphous sample with a higher specific surface area, which is expected to develop a higher adsorption capacity
Summary
Chitosan is derived from natural sources, such as insects’ skeletons, crustaceans and fungi that act to be biocompatible and biodegradable [1,2]. Particular attention is paid to chitosan due to its very efficient biosorbent properties and low cost (compared to active carbon) and its high content of functional hydroxyl and amino groups [2,3] This biopolymer is a smart substitute for other biomaterials because of its physicochemical characteristics: high reactivity, excellent chelation behavior, chemical permanence and high selectivity to pollutants [8,9,10]. The present paper mainly focuses on the chemical modification of chitosan with 1phosphonopropyl groups (α-aminophosphonic acid groups) and nickel ions and its adsorption performance. The efficient synthesis of modified chitosan with 1-phosphonopropyl groups (α-aminophosphonic acid groups) and Ni(II) ions was analyzed by varying the reaction pH. The effects of pH, initial lead concentration, and contact times upon adsorption properties were investigated in detail
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