N掺杂木质素对钨的吸附

张保平; 柯晶; 方诗媛; 李文灿

doi:10.3969/j.issn.1000-1565.2024.03.006

河北大学学报(自然科学版) >

2024 , Vol. 44 >Issue 3: 269 - 280

DOI: https://doi.org/10.3969/j.issn.1000-1565.2024.03.006

N掺杂木质素对钨的吸附

张保平 ,
柯晶 ,
方诗媛 ,
李文灿

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张保平(1974—),男,武汉科技大学副教授,博士,主要从事生物质吸附剂改性与应用研究.
E-mail:zhangbaoping@wust.edu.cn

收稿日期: 2023-12-28

网络出版日期: 2024-07-01

基金资助

国家自然科学基金资助项目(U1960108)

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Adsorption of tungsten by N-doped lignin

ZHANG Baoping ,
KE Jing ,
FANG Shiyuan ,
LI Wencan

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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 date: 2023-12-28

Online published: 2024-07-01

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摘要

木质素经胺化和季铵化改性后制备了N掺杂木质素,并用于吸附钨,通过SEM-EDS和FTIR对吸附剂进行表征,考察pH值、钨初始质量浓度、吸附时间和吸附剂用量对吸附容量的影响,利用SEM-EDS、FTIR和XPS分析揭示吸附过程的机制.结果表明,N掺杂木质素表面疏松多孔且含有大量的酚羟基、胺基和季铵官能团,在总钨浓度为0.005 mol/L、pH<4.7时,钨的存在形态为H₂W₁₂O^6-₄₀.H₂W₁₂O^6-₄₀通过与N掺杂木质素中氢键的静电吸引、胺基的配合和氯离子的离子交换作用而被吸附.在pH=4.0、钨初始质量浓度为800 mg/L、吸附时间为960 min的条件下,1 g/L N掺杂木质素对钨的饱和吸附容量为421.68 mg/g.吸附过程遵循Langmuir模型和准二级动力学模型,表明吸附过程为单分子层均质化学吸附.

关键词： N掺杂木质素; 钨; 吸附行为; 吸附机制

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张保平 , 柯晶 , 方诗媛 , 李文灿 . N掺杂木质素对钨的吸附[J]. 河北大学学报(自然科学版), 2024 , 44(3) : 269 -280 . DOI: 10.3969/j.issn.1000-1565.2024.03.006

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 H₂W₁₂O^6-₄₀. H₂W₁₂O^6-₄₀ 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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