Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, PR China.
J Hazard Mater. 2010 Jun 15;178(1-3):505-16. doi: 10.1016/j.jhazmat.2010.01.110. Epub 2010 Jan 25.
The adsorption of 1-naphthylamine, 1-naphthol and phenol on as-prepared and oxidized multiwalled carbon nanotubes (MWCNTs) has been investigated. The results illustrated that both as-prepared and oxidized MWCNTs showed high adsorption capacity for the three ionizable aromatic compounds (IACs) studied. Oxidation of MWCNTs increased the surface area and the pore volume, and introduced oxygen-containing functional groups to the surfaces of MWCNTs, which depressed the adsorption of IACs on MWCNTs. Both Langmuir and Freundlich models described the adsorption isotherms very well and the adsorption thermodynamic parameters (DeltaG degrees, DeltaH degrees and DeltaS degrees) were measured. The adsorption for 1-naphthylamine, 1-naphthol and phenol is general spontaneous and thermodynamically favorable. The adsorption of phenol is an exothermic process, whereas the adsorption of 1-naphthylamine and 1-naphthol is an endothermic process. Results of this work are of great significance for the environmental application of MWCNTs for the removal of IACs from large volume of aqueous solutions.
研究了 1-萘胺、1-萘酚和苯酚在制备的和氧化的多壁碳纳米管（MWCNTs）上的吸附。结果表明，制备的和氧化的 MWCNTs 对所研究的三种可离解芳香族化合物（IACs）都表现出高吸附能力。MWCNTs 的氧化增加了表面积和孔体积，并在 MWCNTs 的表面引入了含氧官能团，从而抑制了 IACs 在 MWCNTs 上的吸附。Langmuir 和 Freundlich 模型都很好地描述了吸附等温线，并测量了吸附热力学参数（ΔG°、ΔH°和ΔS°）。1-萘胺、1-萘酚和苯酚的吸附通常是自发和热力学有利的。苯酚的吸附是放热过程，而 1-萘胺和 1-萘酚的吸附是吸热过程。这项工作的结果对于 MWCNTs 在从大量水溶液中去除 IACs 方面的环境应用具有重要意义。
