High efficient adsorption of W(VI) with a novel lignin-based biosorbent functionalized with Zn2+ and polyamine

作者：Zhang, Baoping^*; Fang, Shiyuan; Ke, Jing

来源：International Journal of Biological Macromolecules, 2023, 250: 126083.

DOI：10.1016/j.ijbiomac.2023.126083

• Zn2+/polyamine lignin
• W(VI)
• Amination
• Metallization

Functionalized lignin-based biosorbent has become popular in wastewater treatment and extraction of valuable metals. Amination and metallization modification can effectively improve the adsorption performance of adsorbent. Zn2+/polyamine lignin for adsorption of W(VI) was synthesized by quaternization, amination and metallization from lignin with 3-chloro-2-hydroxypropyl trimethylammonium chloride, tetraethylenepentamine and ZnCl2. The adsorbent was characterized by SEM-EDS, FTIR and XRD. The adsorption performance of Zn2+/polyamine lignin for W(VI) was investigated in batch system. The adsorption mechanism was revealed by zeta potential, SEM-EDS and FTIR and XPS. It was shown that Zn2+/polyamine lignin exhibited great adsorption capacity at pH of 2, 25 degrees C, oscillation rate of 400 r/min, initial tungsten concentration of 700 mg center dot L-1 and adsorption time of 720 min. The maximum adsorption capacity of 0.5 g center dot L-1 Zn2+/polyamine lignin for W(VI) reached 488.28 mg center dot g(-1). The adsorption followed Langmuir model and quasi-second-order kinetic model, indicating that the adsorption was monolayer homogeneous chemisorption. W(VI) was adsorbed through electrostatic attraction of hydrogen bond and Zn2+, ion exchange with Cl- and coordination with -NH2. The adsorption capacity reduced by only 6.47 % after seven cycles of adsorption-desorption, which indicated that Zn2+/polyamine lignin had a great application prospect.