A Novel Chitosan/Nano-Hydroxyapatite Composite for the Adsorptive Removal of Cd(II) from Aqueous Solutionopen access
- Authors
- El Kaim Billah, Rachid; Ayouch, Ikrame; Abdellaoui, Youness; Kassab, Zineb; Khan, Moonis Ali; Agunaou, Mahfoud; Soufiane, Abdessadik; Otero, Marta; Jeon, Byong-Hun
- Issue Date
- Mar-2023
- Publisher
- MDPI
- Keywords
- nano-hydroxyapatite; chitosan; bio-composite; cadmium; adsorption mechanism
- Citation
- POLYMERS, v.15, no.6, pp.1 - 17
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMERS
- Volume
- 15
- Number
- 6
- Start Page
- 1
- End Page
- 17
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185461
- DOI
- 10.3390/polym15061524
- Abstract
- A novel polymer bio-composite based on nano-hydroxyapatite (n-Hap) and chitosan (CS) (CS/n-Hap) was synthesized to effectively address toxic cadmium ions removal from water. The composition and structure of CS/n-Hap bio-composite were analyzed through different characterization techniques. XRD patterns affirmed that the crystalline structure of n-Hap remained unaltered during CS/n-Hap synthesis, while FT-IR spectrum sustained all the characteristic peaks of both CS and n-Hap, affirming the successful synthesis of CS/n-Hap. Adsorption studies, including pH, adsorbent dosage, contact time, initial Cd(II) concentration, and temperature, were carried out to explain and understand the adsorption mechanism. Comparatively, CS/n-Hap bio-composite exhibited better Cd(II) adsorption capacity than pristine CS, with an experimental maximum uptake of 126.65 mg/g under optimized conditions. In addition, the kinetic data were well fitted to the pseudo-second-order model, indicating the formation of chemical bonds between Cd(II) and CS/n-Hap during adsorption. Furthermore, the thermodynamic study suggested that Cd(II) adsorption onto CS/n-Hap was endothermic and spontaneous. The regeneration study showed only about a 3% loss in Cd(II) uptake by CS/n-Hap after five consecutive cycles. Thus, a simple and facile approach was here developed to synthesize an eco-friendly and cost-effective material that can be successfully employed for the removal of toxic heavy metal ions from water.
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