Design of Chitosan-Grafted Carbon Nanotubes: Evaluation of How the -OH Functional Group Affects Cs+ Adsorption.
Design of Chitosan-Grafted Carbon Nanotubes: Evaluation of How the -OH Functional Group Affects Cs+ Adsorption.
复制标题
壳聚糖接枝碳纳米管的设计：评估 -OH 官能团如何影响 Cs 吸附
DOI：
10.3390/md13053116
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发表时间：
2015-05-20
期刊：
影响因子：
5.4
通讯作者：
Yu J
中科院分区：
文献类型：
--
作者：
Yang S;Shao D;Wang X;Hou G;Nagatsu M;Tan X;Ren X;Yu J
为了探讨-OH官能团在Cs+吸附中的作用，本文利用低温等离子体诱导接枝法将壳聚糖接枝到碳纳米管上（表示为CTS-g-CNTs），因为生碳纳米管具有较少的官能团，而壳聚糖具有大量的-OH官能团。合成的CTS-g-CNT复合材料，其特征在于使用不同的技术。通过比较接枝壳聚糖前后碳纳米管对Cs+的吸附性能，研究了-OH官能团在吸附Cs+过程中的作用。研究了pH值和接触时间等环境条件的变化。污染的海水和模拟地下水的比较也进行了评价。结果表明：结果表明：（1）CNTs对Cs+离子的吸附强烈依赖于pH值和竞争性阳离子;（2）CNTs基材料中的-OH官能团对Cs+离子的吸附有积极的影响;（3）模拟污染地下水可以模拟污染海水来评价CNTs基材料的吸附性能。这些结果为-OH官能团对Cs+吸附的影响提供了直接的观察证据。我们的研究结果对于设计和选择有效的材料来补救从受污染的地下水和海水中去除放射性铯提供了未来的方向，这对公众健康和人类社会环境至关重要。
In order to explore the effect of –OH functional groups in Cs+ adsorption, we herein used the low temperature plasma-induced grafting method to graft chitosan onto carbon nanotubes (denoted as CTS-g-CNTs), as raw-CNTs have few functional groups and chitosan has a large number of –OH functional groups. The synthesized CTS-g-CNT composites were characterized using different techniques. The effect of –OH functional groups in the Cs+ adsorption process was evaluated by comparison of the adsorption properties of raw-CNTs with and without grafting chitosan. The variation of environmental conditions such as pH and contact time was investigated. A comparison of contaminated seawater and simulated groundwater was also evaluated. The results indicated that: (1) the adsorption of Cs+ ions was strongly dependent on pH and the competitive cations; (2) for CNT-based material, the –OH functional groups have a positive effect on Cs+ removal; (3) simulated contaminated groundwater can be used to model contaminated seawater to evaluate the adsorption property of CNTs-based material. These results showed direct observational evidence on the effect of –OH functional groups for Cs+ adsorption. Our findings are important in providing future directions to design and to choose effective material to remedy the removal of radioactive cesium from contaminated groundwater and seawater, crucial for public health and the human social environment.
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