采用磁性碳纳米管去除水溶液中的亚甲基蓝。
Removal of methyl blue from aqueous solution by magnetic carbon nanotube.
机构信息
Department of Chemistry, China University of Geosciences, Wuhan, China.
出版信息
Water Sci Technol. 2013;68(3):665-73. doi: 10.2166/wst.2013.289.
Magnetic carbon nanotube (mCNT) was formed via direct mixing of carbon nanotube (CNT) with magnetic nanoparticle (MNP) in dye solution. When the mass ratio of MNP to CNT was 4:1, all CNT were magnetically collected. The adsorption performance of mCNT was evaluated using methyl blue (MB) as a model adsorbate. Equilibrium of MB adsorption was attained in 60 min, and maximum adsorption occurred at pH 3-6. MB adsorption was independent of ionic strength and followed pseudo-second-order kinetics. According to the Langmuir isotherm, adsorption capacity of mCNT for MB was 115.34 mg g(-1). Thermodynamic analysis suggested MB adsorption onto mCNT was a spontaneous process. Reusability study results showed that 97.06, 96.26, 94.33, 92.91 and 90.14% of MB were removed in five consecutive cycles. The study suggests that the mCNT has a great potential application in dye removal from industrial wastewater.
磁性碳纳米管（mCNT）是通过将碳纳米管（CNT）与磁性纳米颗粒（MNP）直接混合在染料溶液中形成的。当 MNP 与 CNT 的质量比为 4:1 时，所有 CNT 都被磁性收集。使用亚甲基蓝（MB）作为模型吸附剂来评估 mCNT 的吸附性能。MB 的吸附在 60 分钟内达到平衡，最大吸附发生在 pH 3-6。MB 的吸附与离子强度无关，符合拟二级动力学。根据 Langmuir 等温线，mCNT 对 MB 的吸附容量为 115.34mg/g。热力学分析表明，MB 吸附到 mCNT 上是一个自发的过程。重复使用研究结果表明，在连续五次循环中，有 97.06%、96.26%、94.33%、92.91%和 90.14%的 MB 被去除。该研究表明，mCNT 在去除工业废水中的染料方面具有很大的应用潜力。
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