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Adsorption of BSA on carbon-coated Fe3O4 microspheres activated with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride

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Abstract

Carbon-coated Fe3O4 (Fe3O4/C) microspheres activated with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC) were prepared, characterized and applied to adsorb bovine serum albumin (BSA). The prepared magnetic microspheres had spherical core-shell structure with a uniform and continuous carbon coating coupled with activation by EDC, and possessed superparamagnetic characteristics. The experimental results showed that the adsorption amount of BSA on the EDC-activated Fe3O4/C (Fe3O4/C-EDC) microspheres was higher than that on the Fe3O4/C microspheres. The maximum adsorption of BSA on Fe3O4/C-EDC microspheres occurred at pH 4.7, which was the isoelectric point of BSA. At low concentrations (below 1.0 M), salt had no noticeable effect on BSA adsorption. The BSA adsorption of Fe3O4/C-EDC microspheres had a better fit to the Langmuir model than the Freundlich isotherm and Temkin isotherm model, and the kinetic data were well described by the pseudo-second-order model. The adsorption equilibrium could be reached within 20 min. High desorption efficiency (97.6%) of BSA from Fe3O4/C-EDC microspheres was obtained with 0.5 M Na2HPO4 (pH 9.4) as the desorbent.

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Authors and Affiliations

  1. College of Science, Northeastern University, Shenyang, 110819, China

    Jiamin Shan  (单嘉敏), Cholhwan Kim, Zefei Zhang, Linshan Wang  (王林山) & Ting Sun

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  1. Jiamin Shan  (单嘉敏)
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  2. Cholhwan Kim
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  3. Zefei Zhang
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  4. Linshan Wang  (王林山)
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  5. Ting Sun
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Corresponding author

Correspondence to Linshan Wang  (王林山).

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Funded by the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2013ZX07202-010)

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Shan, J., Kim, C., Zhang, Z. et al. Adsorption of BSA on carbon-coated Fe3O4 microspheres activated with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 1–8 (2018). https://doi.org/10.1007/s11595-018-1777-0

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  • DOI: https://doi.org/10.1007/s11595-018-1777-0

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