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Mar. Drugs 2015, 13(5), 3116-3131; doi:10.3390/md13053116

Design of Chitosan-Grafted Carbon Nanotubes: Evaluation of How the –OH Functional Group Affects Cs+ Adsorption

1
School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, China
2
Graduate School of Science and Technology, Shizuoka University, 3-5-1, Johoka-ku, Hamamatsu 432-8561, Japan
3
School for Radiological and Interdisciplinary Sciences, Soochow University, Suzhou 215123, China
4
Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou 215123, China
5
Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China
*
Authors to whom correspondence should be addressed.
Academic Editor: David Harding
Received: 10 October 2014 / Accepted: 17 December 2014 / Published: 20 May 2015
(This article belongs to the Special Issue Advances in Marine Chitin and Chitosan)
View Full-Text   |   Download PDF [1011 KB, uploaded 20 May 2015]   |  

Abstract

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. View Full-Text
Keywords: carbon nanotube (CNTs); chitosan; Cs+ adsorption; –OH functional groups carbon nanotube (CNTs); chitosan; Cs+ adsorption; –OH functional groups
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, S.; Shao, D.; Wang, X.; Hou, G.; Nagatsu, M.; Tan, X.; Ren, X.; Yu, J. Design of Chitosan-Grafted Carbon Nanotubes: Evaluation of How the –OH Functional Group Affects Cs+ Adsorption. Mar. Drugs 2015, 13, 3116-3131.

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