The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China.
Int J Biol Macromol. 2023 Oct 1;250:126083. doi: 10.1016/j.ijbiomac.2023.126083. Epub 2023 Aug 1.
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. Zn/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 ZnCl. The adsorbent was characterized by SEM-EDS, FTIR and XRD. The adsorption performance of Zn/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 Zn/polyamine lignin exhibited great adsorption capacity at pH of 2, 25 °C, oscillation rate of 400 r/min, initial tungsten concentration of 700 mg·L and adsorption time of 720 min. The maximum adsorption capacity of 0.5 g·L Zn/polyamine lignin for W(VI) reached 488.28 mg·g. 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 Zn, ion exchange with Cl and coordination with -NH. The adsorption capacity reduced by only 6.47 % after seven cycles of adsorption-desorption, which indicated that Zn/polyamine lignin had a great application prospect.
功能化木质素基生物吸附剂在废水处理和提取有价值的金属方面变得很受欢迎。胺化和金属化修饰可以有效地提高吸附剂的吸附性能。通过季铵化、胺化和金属化，从木质素与 3-氯-2-羟丙基三甲基氯化铵、四乙烯五胺和 ZnCl 反应，合成了用于吸附 W(VI)的 Zn/多胺木质素。通过 SEM-EDS、FTIR 和 XRD 对吸附剂进行了表征。在批处理系统中研究了 Zn/多胺木质素对 W(VI)的吸附性能。通过动电位、SEM-EDS 和 FTIR 以及 XPS 揭示了吸附机理。结果表明，在 pH 值为 2、25°C、振荡速率为 400 r/min、初始钨浓度为 700 mg·L 和吸附时间为 720 min 的条件下，Zn/多胺木质素对 W(VI)表现出很大的吸附能力。0.5 g·L Zn/多胺木质素对 W(VI)的最大吸附容量达到 488.28 mg·g。吸附符合 Langmuir 模型和拟二级动力学模型，表明吸附是单层均相化学吸附。W(VI)通过氢键和 Zn 的静电吸引、Cl 的离子交换和-NH 的配位被吸附。经过七次吸附-解吸循环后，吸附容量仅降低了 6.47%，这表明 Zn/多胺木质素具有很大的应用前景。
