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基于纤维素、半纤维素和木质素的用于去除铜（II）离子的高性能水凝胶吸附剂

High-Performance Hydrogel Adsorbent Based on Cellulose, Hemicellulose, and Lignin for Copper(II) Ion Removal.

作者信息

Shan Shuang, Sun Xiao-Feng, Xie Yangyang, Li Wenbo, Ji Tiezheng

机构信息

Shenzhen Research Institute, Northwestern Polytechnical University, Shenzhen 518057, China.

School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China.

出版信息

Polymers (Basel). 2021 Sep 10;13(18):3063. doi: 10.3390/polym13183063.

DOI:10.3390/polym13183063
PMID:34577964
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8473214/
Abstract

Cellulose, hemicellulose, and lignin are three kinds of biopolymer in lignocellulosic biomass, and the utilization of the three biopolymers to synthesize hydrogel adsorbent could protect the environment and enhance the economic value of the biomass. A novel hydrogel adsorbent was prepared using cellulose, lignin, and hemicellulose of wheat straw by a one-pot method, and the adsorbent showed excellent adsorption performance for copper(II) ions. Scanning electron microscopy and Fourier transform infrared spectroscopy analysis showed that the prepared straw-biopolymer-based hydrogel had porous structure, and cellulose fibrils had crosslinked with lignin and hemicellulose by poly(acrylic acid) chains. The effects of contact time, initial concentration, and temperature on the copper(II) ion removal using the prepared hydrogels were investigated, and the obtained results indicated that the adsorption kinetics conformed to the pseudo-second-order and Elovich equation models and the adsorption isotherm was in accord with the Freundlich model. The adsorption thermodynamics study indicated that the adsorption process was spontaneous and accompanied by heat. X-ray photoelectron spectroscopy analysis revealed that the adsorption behavior resulted from ion exchange. The prepared hydrogel based on cellulose, hemicellulose, and lignin could be used for water treatment and soil remediation because of its high performances of excellent heavy metal ion removal and water retention.

摘要

纤维素、半纤维素和木质素是木质纤维素生物质中的三种生物聚合物，利用这三种生物聚合物合成水凝胶吸附剂可以保护环境并提高生物质的经济价值。采用一锅法，以小麦秸秆中的纤维素、木质素和半纤维素制备了一种新型水凝胶吸附剂，该吸附剂对铜（II）离子表现出优异的吸附性能。扫描电子显微镜和傅里叶变换红外光谱分析表明，所制备的基于秸秆生物聚合物的水凝胶具有多孔结构，纤维素原纤维通过聚丙烯酸链与木质素和半纤维素发生了交联。研究了接触时间、初始浓度和温度对所制备水凝胶去除铜（II）离子的影响，所得结果表明吸附动力学符合准二级和埃洛维奇方程模型，吸附等温线符合弗伦德里希模型。吸附热力学研究表明，吸附过程是自发的且伴有热量变化。X射线光电子能谱分析表明，吸附行为是由离子交换引起的。所制备的基于纤维素、半纤维素和木质素的水凝胶因其具有优异的重金属离子去除性能和保水性能，可用于水处理和土壤修复。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/1f4daf8494b4/polymers-13-03063-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/3f6a68aceb97/polymers-13-03063-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/e7f83f814f95/polymers-13-03063-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/7fd0976641bf/polymers-13-03063-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/ec894190a4d1/polymers-13-03063-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/954735d38992/polymers-13-03063-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/a86181f6bc6d/polymers-13-03063-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/c687db914e37/polymers-13-03063-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/272c28217379/polymers-13-03063-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/de9722678cec/polymers-13-03063-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/1f4daf8494b4/polymers-13-03063-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/3f6a68aceb97/polymers-13-03063-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/e7f83f814f95/polymers-13-03063-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/7fd0976641bf/polymers-13-03063-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/ec894190a4d1/polymers-13-03063-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/954735d38992/polymers-13-03063-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/a86181f6bc6d/polymers-13-03063-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/c687db914e37/polymers-13-03063-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/272c28217379/polymers-13-03063-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/de9722678cec/polymers-13-03063-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba28/8473214/1f4daf8494b4/polymers-13-03063-g010.jpg

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