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Sorption of Pb(II) on carboxymethyl chitosan-conjugated magnetite nanoparticles: application of sorbent dosage-dependent isotherms

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Abstract

Carboxymethyl chitosan (CMCS)-conjugated magnetite (Fe3O4) nanoparticles (MNPs), which are denoted as CMCS-MNPs, were synthesized by covalently binding CMCS onto the surface of the MNPs via carbodiimide activation in a paraffin-acetic acid medium. The CMCS-MNPs exhibited a high level of CMCS binding (∼24.7 wt.%) and a spherical morphology with a mean diameter of 15 nm. In particular, they showed good water dispersity and a strong magnetic response. The sorption of Pb(II) on the CMCS-MNPs in aqueous solutions at different sorbent dosages (C s), pH, electrolyte (NaNO3) concentrations (C NaNO3), and temperatures (T) was investigated. The CMCS-MNPs showed high sorption capacity for Pb(II). The equilibrium amount increased with increasing pH but decreased with increasing C NaNO3 or T. In addition, a significant C s-effect was observed in the sorption equilibria. Two C s-dependent models, the Langmuir-SCA and Freundlich-SCA isotherms that were derived from a surface component activity (SCA) model, could describe the C s-effect observed. The changes in pH, C NaNO3, and T have no obvious influence on the C s-effect. In addition, the changes in the thermodynamic parameters, ∆G°, ∆H°, and ∆S°, for sorption were estimated, showing that the sorption process is spontaneous and exothermic.

Carboxymethyl chitosan (CMCS)-conjugated magnetite nanoparticles (MNPs), denoted as CMCS-MNPs, were synthesized. The CMCS-MNPs showed high sorption capacity for Pb(II). The sorbent effect (C s-effect) observed in the case of Pb (II) sorption on CMCS-MNPs could be described by the Langmuir-SCA and Freundlich-SCA isotherms, which were derived from a surface component activity (SCA) model.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 21573133 and 21403128).

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Authors and Affiliations

  1. Environment Research Institute, Shandong University, Jinan, 250100, People’s Republic of China

    Song Lu & Fengrong Zhang

  2. National Engineering Research Center for Colloidal Materials, Shandong University, Jinan, 250100, People’s Republic of China

    Haiping Li

  3. Key Laboratory of Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan, 250100, People’s Republic of China

    Na Du & Wanguo Hou

Authors
  1. Song Lu
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  2. Haiping Li
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  3. Fengrong Zhang
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  4. Na Du
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  5. Wanguo Hou
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Correspondence to Wanguo Hou.

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Research highlights:

1. Carboxymethyl chitosan-conjugated Fe3O4 nanoparticles, CMCS-MNPs, were synthesized.

2. CMCS-MNPs are an effective sorbent for the removal of Pb(II) from solution.

3. A sorbent effect (C s-effect) was observed for Pb(II) sorption on the CMCS-MNPs.

4. The C s-effect could be described using the Langmuir-SCA and Freundlich-SCA models.

5. The pH, electrolyte, and temperature had no obvious influence on the C s-effect.

6. Pb(II) sorption on the CMCS-MNPs is spontaneous and exothermic in nature.

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Lu, S., Li, H., Zhang, F. et al. Sorption of Pb(II) on carboxymethyl chitosan-conjugated magnetite nanoparticles: application of sorbent dosage-dependent isotherms. Colloid Polym Sci 294, 1369–1379 (2016). https://doi.org/10.1007/s00396-016-3893-8

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  • DOI: https://doi.org/10.1007/s00396-016-3893-8

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