| 碳纳米管吸附腐植酸的动力学、热力学及机理研究 |
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| 引用本文： | 朱志平,黄可龙,周艺. 碳纳米管吸附腐植酸的动力学、热力学及机理研究[J]. 无机材料学报, 2011, 26(2): 170-174. DOI: 10.3724/SP.J.1077.2011.00170 |
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| 作者姓名： | 朱志平 黄可龙 周艺 |
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| 作者单位： | 1.中南大学 化学与化工学院, 长沙410086; 2. 长沙理工大学 化学与生物工程学院, 长沙410114 |
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| 基金项目： | 国家自然科学基金(20976016); 湖南省自然科学基金(09JJ6067)~~ |
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| 摘 要： | 针对天然水中腐植酸(HA)类溶解性有机物去除问题, 采用多壁碳纳米管为吸附剂, 在不同的pH值、吸附剂量、初始HA浓度下进行吸附动力学实验, 用准二级速率方程拟合了动力学数据, 其线性相关度在0.99以上, 拟合得到的平衡吸附量为27mg/g,与实验结果(25.5 mg/g)基本一致. 在25~50℃下进行了碳纳米管吸附腐植酸的等温吸附实验, 以Langmuir模型拟合的平衡吸附量为29.7mg/g, 与实验结果相近. 用Clapeyron-Clausius与Gibbs- Helmholtz方程计算的自由能(Δ G)、焓(Δ H)、熵(Δ S)皆为负值, 说明碳纳米管对腐植酸的吸附为放热熵减过程. 碳纳米管的表面、管间隙、管内腔及管束之间形成的束聚孔为其有效吸附点位, 腐植酸与碳纳米管间的π-π作用也是吸附的主要原因之一.
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| 关 键 词： | 碳纳米管 腐植酸 吸附 动力学 热力学 |
| 收稿时间： | 2010-05-06 |
| 修稿时间： | 2010-09-05 |
Study on Kinetics,Thermodynamics and Mechanism for Carbon Nanotubes Adsorbing Humic Acid |
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| ZHU Zhi-PING,,HUANG Ke-Long,ZHOU Yi. Study on Kinetics,Thermodynamics and Mechanism for Carbon Nanotubes Adsorbing Humic Acid[J]. Journal of Inorganic Materials, 2011, 26(2): 170-174. DOI: 10.3724/SP.J.1077.2011.00170 |
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| Authors: | ZHU Zhi-PING HUANG Ke-Long ZHOU Yi |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Central SouthUniversity, Changsha 410082, China; 2. College of Chemical and biological Engineering,Changsha University of Science & Technology, Changsha 410114, China |
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| Abstract: | The dissolved organic carbon in natural water was mainly from soluble humic acid(HA) which had much harms in industrial and drinkable water.As a new adsorbent,the multi-walled carbon nanotubes(MCNTs) were used to remove HA at different pH value,different MCNTs dosages and different HA initial concentration,a series of experiments including batch adsorption,adsorption isotherm were carried.The adsorption kinetics data was fitted with pseudo-second-order rate model,their linear correlations was above 0.99,and... |
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| Keywords: | multi-walled carbon nanotubes(MCNT) humic acid(HA) adsorption kinetics thermodynamics |
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