AI Article Synopsis
- The study investigates the effectiveness of chitosan-based materials (CS, CMCS, HACC) loaded with ink melanin (ME) for removing cadmium ions (Cd(II)) from solutions.
- Results showed that the modified chitosan with ME significantly enhanced the adsorption capacity, particularly HACC-ME, which achieved a removal rate of 107.18 mg/g and maintained high efficiency over multiple cycles.
- Key mechanisms for Cd(II) removal included ion exchange, complexation, electrostatic attraction, and hydrophobic interaction, suggesting HACC-ME as a promising low-cost natural adsorbent for environmental remediation.
Article Abstract
In this study, chitosan (CS), carboxymethyl chitosan (CMCS), and chitosan quaternary ammonium salt (HACC) were successfully loaded with ink melanin (ME) as efficient adsorbents for Cd(II) removal. The results of batch adsorption experiments and structural characterization showed that the modified CS loaded with ME improved the adsorption capacity of the composites for Cd(II). The pseudo-second-order kinetic and Langmuir equations were better suited to describe the batch adsorption experiments. The adsorption of Cd(II) was chemisorption with desirable adsorption effect when the concentration of the three composites was 0.5 mg/mL and the pH value was neutral. Among them, HACC-ME demonstrated remarkable Cd(II) adsorption performance (107.18 mg/g) and sustained an 85 % efficiency in Cd(II) removal over five adsorption-desorption cycles. Ion exchange, complexation, electrostatic attraction, and hydrophobic interaction were the primary mechanisms for Cd(II) removal. Overall, HACC-ME could be employed as a low-cost and highly efficient new natural adsorbent material for the removal of Cd(II) ions from wastewater. These findings illuminate pathways for the development of efficient and novel natural adsorbent materials for environmental cleanup purposes.
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| http://dx.doi.org/10.1016/j.ijbiomac.2024.137147 | DOI Listing |
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