| Optimizing the adsorption performance of the chitosan biopolymer for heavy metal ions via imine derivatives |
| کد مقاله : 1170-ICOC |
| نویسندگان |
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راضیه نجات *1، زهره قلی زاده2 1دانشگاه کوثر بجنورد 2استان خراسان شمالی، بجنورد، جاده ارکان، بعد از بیمارستان امام حسن(ع)، دانشگاه کوثر |
| چکیده مقاله |
| Nowadays, heavy metal pollution is one of the most important environmental problems for humans. Some heavy metals, including cadmium, lead, and mercury, are the most prominent chemical concerns of public health [1]. Heavy metal ions can bind to bio-macromolecules, such as nucleic acids, proteins, and small metabolites in living organisms, and inhibit their activities [2]. Thus, these pollutants must be removed from wastewaters due to their serious effects on human health and ecological systems. For the removal of heavy metal ions from aqueous wastes, several techniques are currently used; some of them include chemical precipitation, ion exchange, electrochemical treatment, membrane technologies, and adsorption methods [1,3]. This study describes a simple and efficient preparation method for a modified chitosan (CS) capable of effectively adsorbing cadmium ions (Cd²⁺) from aqueous solutions. To introduce a high density of accessible binding sites, the Schiff-base ligand 2,2-(Propan-1,3-diyl bis(oxy))dibenzaldehyde is synthesized and covalently anchored onto the chitosan backbone. The presence of two benzaldehyde moieties connected through a propylene–dioxy linker allows the formation of multiple imine (C=N) groups by reacting with free –NH₂ functionalities of chitosan. This structural modification significantly increases the number of coordination sites, thereby enhancing the affinity of the modified CS toward Cd²⁺ ions through chelation and surface complexation mechanisms. Consequently, the developed Schiff-base-functionalized chitosan exhibits excellent potential as a selective and high-capacity adsorbent for cadmium removal from water. |
| کلیدواژه ها |
| Chitosan, Adsorption, Schiff base, Heavy metal |
| وضعیت: پذیرفته شده |