Adsorption and desorption of atrazine on carbon nanotubes.
Adsorption and desorption of atrazine on carbon nanotubes.
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DOI：
10.1016/j.jcis.2008.01.047
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发表时间：
2008-05
影响因子：
9.9
通讯作者：
X. M. Yan;B. Shi;J. Lu;C. Feng;D. Wang;H. Tang
中科院分区：
文献类型：
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作者：
X. M. Yan;B. Shi;J. Lu;C. Feng;D. Wang;H. Tang
碳纳米管（CNTs）对人类健康和环境的潜在影响正受到越来越多的关注。CNT的高表面积倾向于吸附多种有毒化学品，这可能增强CNT和/或有毒化学品的毒性。本研究利用间歇式反应器研究了水溶液中阿特拉津在碳纳米管上的吸附与脱附行为。吸附平衡等温线为非线性，可用Freundlich、Langmuir和Polanyi-Manes模型拟合。结果表明，Polanyi-Manes模型较好地描述了吸附过程。结合“特征曲线”，Polanyi吸附势理论适用于描述阿特拉津在碳纳米管上的吸附过程。热力学计算表明，阿特拉津在碳纳米管上的吸附反应是自发的放热反应。解吸数据表明，没有明显的解吸滞后发生。碳纳米管对阿特拉津的高吸附容量和吸附可逆性表明碳纳米管具有较高的健康和环境风险，但它们在去除水中阿特拉津方面具有潜在的应用前景。
The potential impact of carbon nanotubes (CNTs) on human health and the environment is receiving more and more attention. The high surface area of CNTs tends to adsorb a large variety of toxic chemicals, which may enhance the toxicity of CNTs and/or toxic chemicals. In this study, adsorption and desorption of atrazine on carbon nanotubes from aqueous solution were studied through batch reactors. The adsorption equilibrium isotherms were nonlinear and were fitted by Freundlich, Langmuir, and Polanyi–Manes models. It was found that the Polanyi–Manes model described the adsorption process better than other two isotherm models. Together with the “characteristic curve,” the Polanyi adsorption potential theory is applicable to describe the adsorption process of atrazine on CNTs. Thermodynamic calculations indicated that the adsorption reaction of atrazine on CNTs is spontaneous and exothermic. The desorption data showed that no significant desorption hysteresis occurred. High adsorption capacity and adsorption reversibility of atrazine on CNTs suggest that CNTs have high health and environmental risks, whereas they have potential applications for atrazine removal from water.