Journal of Hebei University(Natural Science Edition) ›› 2024, Vol. 44 ›› Issue (3): 269-280.DOI: 10.3969/j.issn.1000-1565.2024.03.006

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Adsorption of tungsten by N-doped lignin

ZHANG Baoping1,2, KE Jing1,2, FANG Shiyuan1,2, LI Wencan1,2   

  1. 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; 2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
  • Received:2023-12-28 Online:2023-05-25 Published:2024-07-01

Abstract: N-doped lignin used for adsorption of tungsten was synthesized by polyamination and quaternization from lignin. The adsorbent was characterized by SEM-EDS and FTIR. The effects of pH, initial mass concentration of tungsten, adsorption time and amount of adsorbent on the adsorption capacity were investigated. The adsorption mechanism was revealed by SEM-EDS and FTIR and XPS. The results showed that N-doped lignin was loose and porous and contained a large amount of phenolic hydroxyl, amine and quaternary ammonium functional groups. When the total concentration of tungsten was 0.005 mol/L and the value of pH was smaller than 4.7, the existing form of tungsten was H2W12O6-40. H2W12O6-40 was adsorbed by N-doped lignin through electrostatic attraction of hydrogen bond and coordination with amino and ion exchange with Cl-. The saturated adsorption capacity of 1 g/L N-doped lignin for tungsten reached 421.68 mg/g at pH of 4.0, with initial tungsten mass concentration of 800 mg/L and adsorption time of 960 min. The adsorption followed Langmuir model and quasi-second-order kinetic model, indicating that the adsorption was monolayer homogeneous chemisorption.

Key words: N-doped lignin, tungsten, adsorption behavior, adsorption mechanism

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