Polydopamine (PDA) functionalized ultrathin carbon layer encapsulated magnetite nanoparticle and graphene oxide (Fe3O4@C-GO@PDA) as recyclable and stable nanoadsorbent for enhanced removal of metal ions
Efficiently eliminating metal ions from water remains a formidable challenge, primarily because of the intricate nature of impurities within the aqueous environment. In this study, magnetite nanoparticles encapsulated by an ultrathin carbon layer and graphene oxide (Fe3O4@C-GO) nanocomposite was fur...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Chemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715625005624 |
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| Summary: | Efficiently eliminating metal ions from water remains a formidable challenge, primarily because of the intricate nature of impurities within the aqueous environment. In this study, magnetite nanoparticles encapsulated by an ultrathin carbon layer and graphene oxide (Fe3O4@C-GO) nanocomposite was further functionalized with polydopamine (PDA) to prepare Fe3O4@C-GO@PDA nanoadsorbent with improved adsorption capabilities for the effective elimination of metal ions from aqueous solutions. The Fe3O4@C-GO@PDA nanoadsorbent showed outstanding adsorption potential. Under the optimal the experimental conditions, the Fe3O4@C-GO@PDA nanoadsorbent effectively removed Zn(II), Cu(II), Pb(II), and Cd(II) ions from aqueous solutions at pH 6, with rates of 99.1 %, 97.7 %, 94.6 %, and 91.1 %, respectively. In comparison with Fe3O4@C-GO nanocomposite, the removal rate, removal capacity and removal equilibrium time of Pb on Fe3O4@C-GO@PDA nanoadsorbent all showed a great improvement. The adsorption of Pb(II) follows pseudo-second-order kinetics (R2 = 0.9993), indicating that chemical adsorption is the dominant mechanism. XPS and FTIR analyses revealed synergistic interactions between Pb(II) and surface functional groups (–NH₂, CO, –COOH). The slightly decrease in the the removal rate in the recovery and recyclability investigations after 5 cycles indicated that Fe3O4@C-GO@PDA nanoadsorbent can be repeatedly used for the removal of for Zn(II), Cu(II), Pb(II) and Cd(II) ions from water. As a result, the Fe3O4@C-GO@PDA nanoadsorbent not only realize the removal of Pb ions from water with efficient removal but also show potential application in the separation and purification of other common metal ions. |
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| ISSN: | 2211-7156 |