三卤甲烷在多壁碳纳米管上的吸附热力学和动力学研究
Adsorption thermodynamic and kinetic studies of trihalomethanes on multiwalled carbon nanotubes.
作者信息
Lu Chungsying, Chung Yao-Lei, Chang Kuan-Foo
机构信息
Department of Environmental Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan.
出版信息
J Hazard Mater. 2006 Nov 16;138(2):304-10. doi: 10.1016/j.jhazmat.2006.05.076. Epub 2006 Jun 2.
Multiwalled carbon nanotubes (MWCNTs) were purified by mixed HNO3/H2SO4 solution and were employed as adsorbents to study adsorption kinetics and thermodynamics of trihalomethanes (THMs) from chlorinated drinking water. The amount of THMs adsorbed onto CNTs decreased with a rise in temperature and high adsorption capacities were found at 5 and 15 degrees C. Under the same conditions, the purified CNTs possess two to three times more adsorption capacities of CHCl3, which accounts for a major portion of THMs in the chlorinated drinking water, than the commercially available PAC suggesting that CNTs are efficient adsorbents. The thermodynamic analysis revealed that the adsorption of THMs onto CNTs is exothermic and spontaneous.
多壁碳纳米管（MWCNTs）通过HNO₃/H₂SO₄混合溶液进行纯化，并用作吸附剂来研究从氯化饮用水中吸附三卤甲烷（THMs）的吸附动力学和热力学。随着温度升高，碳纳米管上吸附的三卤甲烷量减少，在5℃和15℃时发现具有较高的吸附容量。在相同条件下，纯化后的碳纳米管对氯仿（CHCl₃，其在氯化饮用水中占三卤甲烷的主要部分）的吸附容量是市售粉末活性炭（PAC）的两到三倍，这表明碳纳米管是高效的吸附剂。热力学分析表明，三卤甲烷在碳纳米管上的吸附是放热且自发的。
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