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首页> 外文期刊>Journal of industrial and engineering chemistry >Heavy metal ions retention by bi-functionalized lignin: Synthesis, applications, and adsorption mechanisms
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Heavy metal ions retention by bi-functionalized lignin: Synthesis, applications, and adsorption mechanisms

机译：双功能木质素保留重金属离子的合成，应用和吸附机理

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摘要

Bi-functionalized lignin with amino and sulfonic groups (ASL) was synthesized via Mannich reaction and sulfomethylation. It was systematically characterized by FT-IR, element analysis, surface charge and XPS. Effects of initial pH, contact time and initial metal ion concentration on the adsorption of Cu(II)and Pb(II) onto ALS were studied. Results indicated that the biosorbent showed excellent performance for metals even from low pH solutions. The adsorption kinetics and isotherms could be described well with Pseudo-second-order and D-R model, respectively. Further investigation of the metal-loaded ASL by FT-iR and XPS elucidated the amino and sulfonic groups reacted with metals in different way.
机译：通过曼尼希反应和磺甲基化反应合成具有氨基和磺酸基团的双功能木质素（ASL）。通过FT-IR，元素分析，表面电荷和XPS对它进行了系统表征。研究了初始pH，接触时间和初始金属离子浓度对ALS吸附Cu（II）和Pb（II）的影响。结果表明，即使在低pH溶液中，该生物吸附剂对金属也显示出优异的性能。吸附动力学和等温线可以分别用伪二级和D-R模型很好地描述。 FT-iR和XPS对负载金属的ASL进行了进一步研究，阐明了氨基和磺酸基团以不同方式与金属反应。

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