A magnetic composite microsphere, calcium alginate (CA)/carboxymethyl cellulose (CMC)@MnFe2O4, was prepared using CA and CMC encapsulated MnFe2O4 through blending and cross-linking for the removal of Cu(II) from aqueous solution. The CA/CMC@MnFe2O4 was characterized in detail by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and X-ray phosphorescence spectroscopy. In addition, various adsorption conditions including the initial pH of Cu(II) solution, equilibrium contact time, and initial Cu(II) concentration were tested. The adsorption data fit better to the Langmuir isotherm and follow the pseudo-second-order model, suggesting that it is a monolayer adsorption process with chemisorption as the rate-limiting step. The maximum adsorption capacity of the CA/CMC@MnFe2O4 was 77.22 mg g−1 at 25 ℃ and pH 5. Cu(II) removal mechanisms of CA/CMC@MnFe2O4 follow ion exchange as well as the formation of complexes as evidenced based on the microstructure analysis and adsorption data fitting.
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This study was supported by the natural Science Foundation of Hainan Province of China (Project No. 219QN208); the Key Research and Development Project of Hainan Province of China (Project No. ZDYF 2020079), the Education Department of Hainan Province (Project No. Hnky2019-33).
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Yu, C., Li, H., Ma, H. et al. Characteristics and mechanism of Cu(II) adsorption on prepared calcium alginate/carboxymethyl cellulose@MnFe2O4. Polym. Bull. (2021). https://doi.org/10.1007/s00289-021-03555-7
- Sodium alginate
- Carboxymethyl cellulose