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镉（II）在木质素和多糖基聚合物上的吸附比较

Comparison Adsorption of Cd (II) onto Lignin and Polysaccharide-Based Polymers.

作者信息

Ungureanu Elena, Fortună Maria E, Țopa Denis C, Brezuleanu Carmen O, Ungureanu Vlad I, Chiruță Ciprian, Rotaru Razvan, Tofanica Bogdan M, Popa Valentin I, Jităreanu Doina C

机构信息

"Ion Ionescu de la Brad" Iasi University of Life Sciences, 3 Mihail Sadoveanu Alley, 700490 Iasi, Romania.

Institute of Macromolecular Chemistry "Petru Poni", 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania.

出版信息

Polymers (Basel). 2023 Sep 17;15(18):3794. doi: 10.3390/polym15183794.

DOI:10.3390/polym15183794
PMID:37765646
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10535642/
Abstract

Given the predominantly negative impact of heavy metals on living organisms, the present study proposed to evaluate the adsorption performances under static conditions of Cd (II) from aqueous solutions on unmodified Sarkanda grass lignin compared to the adsorption performances of polysaccharide polymers chemically functionalized, obtained by synthesis and in their native state, but which, although effective, have a cost price that does not allow for large-scale expansion. To improve the retention of Cd (II) on this aromatic component of the biomass resulting from the processing of lignocellulosic materials, different experimental conditions (pH, concentration, dose and contact time) were followed. The Freundlich and Langmuir isotherms were used to describe the equilibrium conditions. Adsorption kinetics were assessed using the Lagergren I and Ho and McKay II kinetic models, furnishing informative insights into the process mechanism. Lignin adsorption capacity was also analyzed by performing biological tests on tomato seeds (), since heavy metals are known to be a stress factor for seeds by disturbing the osmotic equilibrium. Through the prism of the investigated parameters and under precisely established experimental conditions, unmodified Sarkanda grass lignin-an aromatic biopolymer-can be recommended as a promising adsorbent for the retention of Cd (II) from aqueous solutions, successfully replacing polysaccharide, especially cellulose-based polymers.

摘要

鉴于重金属对生物有机体主要产生负面影响，本研究旨在评估未改性的蔗茅木质素在静态条件下对水溶液中Cd (II) 的吸附性能，并与通过合成获得的化学功能化多糖聚合物及其天然状态下的吸附性能进行比较，尽管这些多糖聚合物有效，但其成本价格不允许大规模扩展。为了提高Cd (II) 在木质纤维素材料加工产生的生物质的这种芳香成分上的保留率，研究了不同的实验条件（pH值、浓度、剂量和接触时间）。采用Freundlich和Langmuir等温线来描述平衡条件。使用Lagergren I和Ho以及McKay II动力学模型评估吸附动力学，为过程机制提供了有益的见解。还通过对番茄种子进行生物测试来分析木质素的吸附能力，因为已知重金属会通过干扰渗透平衡成为种子的胁迫因素。通过所研究参数的视角以及在精确设定的实验条件下，未改性的蔗茅木质素——一种芳香生物聚合物——可被推荐为从水溶液中保留Cd (II) 的有前景的吸附剂，成功替代多糖，尤其是纤维素基聚合物。

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