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用于从水溶液中去除Pb(II)离子的壳聚糖化学改性

Chemical Modification of Chitosan for Removal of Pb(II) Ions from Aqueous Solutions.

作者信息

Popa Adriana, Visa Aurelia, Maranescu Bianca, Hulka Iosif, Lupa Lavinia

机构信息

Organic Chemistry Department, "CoriolanDragulescu" Institute of Chemistry, 24 Mihai Viteazul Blv, 300223 Timisoara, Romania.

Department of Biology-Chemistry, Faculty of Chemistry, Biology, Geography, West University Timisoara, 16 Pestalozzi Street, 300115 Timisoara, Romania.

出版信息

Materials (Basel). 2021 Dec 20;14(24):7894. doi: 10.3390/ma14247894.

DOI:10.3390/ma14247894
PMID:34947486
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8707187/
Abstract

Biomacromolecule have a significant contribution to the adsorption of metal ions. Moreover, chitosan is one of the most studied biomacromolecule, which has shown a good performance in the field of wastewater treatment. In this context, a new adsorbent of the aminophosphonic modified chitosan-supported Ni(II) ions type was prepared from the naturally biopolymer, chitosan. In the first step, modified chitosan with aminophosphonic acid groups was prepared using the "one-pot" Kabachnik-Fields reaction. It was characterized by different techniques: FTIR, SEM/EDAX, TGA, and P-NMR. In the second step, the modified chitosan with aminophosphonic acid was impregnated with Ni(II) ions using the hydrothermal reaction at different values of pH (5, 6 and 7). The physical-chemical characteristics of final products (modified chitosan carrying aminophosphonic groups and Ni(II) ions) were investigated using FTIR, SEM images, EDAX spectra and thermogravimetric analysis. In this work, the most important objective was the investigation of the adsorbent performance of the chitosan modified with aminophosphonic groups and Ni(II) ions in the process of removing Pb(II) ions from aqueous solutions by studying the effect of pH, contact time, and Pb(II) ions concentration. For removal of Pb(II) ions from the aqueous solution, the batch adsorption method was used.

摘要

生物大分子对金属离子的吸附有重要贡献。此外，壳聚糖是研究最多的生物大分子之一，在废水处理领域表现出良好的性能。在此背景下，以天然生物聚合物壳聚糖为原料制备了一种氨基膦酸改性壳聚糖负载镍（II）离子型新型吸附剂。第一步，采用“一锅法”卡巴奇尼克-菲尔德反应制备了含氨基膦酸基团的改性壳聚糖。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜/能谱仪（SEM/EDAX）、热重分析（TGA）和磷核磁共振（P-NMR）等不同技术对其进行了表征。第二步，在不同pH值（5、6和7）下，利用水热反应将含氨基膦酸的改性壳聚糖用镍（II）离子浸渍。采用傅里叶变换红外光谱、扫描电子显微镜图像、能谱仪光谱和热重分析等方法研究了最终产物（含氨基膦酸基团和镍（II）离子的改性壳聚糖）的物理化学特性。在这项工作中，最重要的目标是通过研究pH值、接触时间和铅（II）离子浓度的影响，考察氨基膦酸基团和镍（II）离子改性壳聚糖在从水溶液中去除铅（II）离子过程中的吸附性能。采用分批吸附法从水溶液中去除铅（II）离子。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e3/8707187/342f63d10c9f/materials-14-07894-sch002.jpg
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