Yan X M, Shi B Y, Lu J J, Feng C H, Wang D S, Tang H X
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, POB 2871, Beijing 10085, PR China.
J Colloid Interface Sci. 2008 May 1;321(1):30-8. doi: 10.1016/j.jcis.2008.01.047. Epub 2008 Feb 2.
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.
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。碳纳米管的高比表面积往往会吸附大量各种有毒化学物质，这可能会增强碳纳米管和/或有毒化学物质的毒性。在本研究中，通过间歇式反应器研究了阿特拉津在碳纳米管上从水溶液中的吸附和解吸。吸附平衡等温线是非线性的，并用弗伦德利希、朗缪尔和波兰尼-马内斯模型进行拟合。结果发现，波兰尼-马内斯模型比其他两种等温线模型能更好地描述吸附过程。结合“特征曲线”，波兰尼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且放热的。解吸数据表明没有明显的解吸滞后现象。阿特拉津在碳纳米管上的高吸附容量和吸附可逆性表明碳纳米管具有很高的健康和环境风险，而它们在从水中去除阿特拉津方面具有潜在应用。
