引用本文:	陈龙,张静,刘维慧,李春,元光.氧化多壁碳纳米管对水中钠离子的吸附研究.海洋与湖沼,2014,45(3):462-467.

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氧化多壁碳纳米管对水中钠离子的吸附研究
陈龙,张静,刘维慧,李春,元光
中国海洋大学信息科学与工程学院,中国海洋大学信息科学与工程学院,中国海洋大学信息科学与工程学院,中国海洋大学信息科学与工程学院,中国海洋大学信息科学与工程学院

摘要:

本文研究了强酸(体积比为3︰1 的硫酸与硝酸)氧化的多壁碳纳米管对水中钠离子的吸附特性, 考察了温度、初始浓度、吸附时间对钠离子吸附的影响。实验结果表明: 多壁碳纳米管对钠离子的吸附能力随温度升高而下降; 其吸附过程符合Langmuir 吸附等温模型, 但是在钠离子浓度较高时多壁碳纳米管的吸附特性更符合Freundlich 等温模型; 在温度为274K 条件下, 多壁碳纳米管对钠离子的吸附能约为?5.53KJ/mol 即?57.3meV; 化学反应焓变约为?9.31KJ/mol, 表明混酸氧化的多壁碳纳米管对钠离子的吸附过程基本为物理吸附。

关键词: 多壁碳纳米管吸附 Na⁺

DOI：10.11693/hyhz20130500067

分类号:

基金项目:国家自然科学基金项目, 41076057 号, 60907007 号

附件

ADSORPTION CHARACTERISTICS OF OXIDIZED MULTI-WALLED CARBON NANOTUBES FOR Na⁺ REMOVAL FROM AQUEOUS SOLUTION

chenlong,zhang Jing,Liu Wei Hui,Li Chun and Yuan Guang

College of Information Science and Engineering, Ocean University of China,College of Information Science and Engineering, Ocean University of China,College of Information Science and Engineering, Ocean University of China,College of Information Science and Engineering, Ocean University of China,College of Information Science and Engineering, Ocean University of China

Abstract:

The adsorption characteristics of Na⁺ onto multi-walled carbon nanotubes (MWCNTs) treated by acid mixture (H₂SO₄ : HNO₃ = 3 : 1) is studied to develop a technology of extracting lithium from seawater. The effects of temperature, the initial Na⁺ concentration, and the contact time on the adsorption are investigated. Experimental results indicate that Na⁺ adsorption capacity with MWCNTs decrease with temperature, and that the experimental data are consistent with Langmuir isotherm models. However, at high Na⁺ concentration, the experimental data are consistent with the Freundlich isotherm models. The Na⁺ absorption energy onto the oxidized MWCNTs (ΔG⁰) is about -5.53KJ/mol (-57.3mev), and the corresponding enthalpy ΔH is -9.31KJ/mol. These values indicate that the Na⁺ adsorption process of onto oxidized MWCNTs is physical.

Key words: carbon nanotubes adsorption Na⁺