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A novel core–shell structured biosorbent derived from chemi-mechanical pulp for heavy metal ion removal

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Abstract

Carboxymethylated cellulose fiber (CMF), a cellulose-based biosorbent, was prepared from chemi-mechanical pulp. The CMF biosorbent showed a high stability/recovery and an excellent adsorption capacity during the metal ion removal due to its unique core–shell structure: (1) the CMF maintained a good fiber formwork even at a high carboxyl content level (175.40 mmol/100 g) due to the protection of carboxymethyl-free lignin shell on the fiber surface, thus facilitating the follow up separation/recovery of CMF; (2) the high carboxyl content in the core of CMF cellulose enabled its strong adsorption capacity towards metal ions. The results showed that the adsorption behavior fitted well to the pseudo-second-order kinetic and the CMF had high selective adsorption towards Pb(II). The CMF also exhibited an excellent recycling performance. Therefore, the as-prepared CMF with high adsorption capacity, good solid–liquid separation and high regeneration performance indicates that the novel core–shell CMF biosorbent can provide a method to remove metal ion in practical wastewater treatment.

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Acknowledgments

This work was financially supported by Key Program of Shaanxi Provincial Science and Technology Department (2017GY-184), High-level Foreign Experts Project (GDT20186100425), and Key Scientific Research Group of Shaanxi Province (2017KCT-02).

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Correspondence to Jian Wang.

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Wang, J., Hu, N., Liu, M. et al. A novel core–shell structured biosorbent derived from chemi-mechanical pulp for heavy metal ion removal. Cellulose 26, 8789–8799 (2019). https://doi.org/10.1007/s10570-019-02693-6

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  • DOI: https://doi.org/10.1007/s10570-019-02693-6

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