A facile approach to prepare porous cup-stacked carbon nanotube with high performance in adsorption of methylene blue
A facile approach to prepare porous cup-stacked carbon nanotube with high performance in adsorption of methylene blue
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一种简便制备亚甲基蓝吸附高性能多孔叠杯碳纳米管的方法
DOI：
10.1016/j.jcis.2014.12.078
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发表时间：
2015-05-01
影响因子：
9.9
通讯作者：
Chen, Xuecheng
中科院分区：
文献类型：
--
作者：
Gong, Jiang;Liu, Jie;Chen, Xuecheng
以聚丙烯为原料，采用氢氧化钾活化法合成了具有特殊堆积结构的多孔杯状碳纳米管(P-CSCNT)。采用场发射扫描电子显微镜、透射电子显微镜、高分辨电子显微镜、N-2吸附、X射线衍射、拉曼光谱、X射线光电子能谱和热重分析等手段对P-CSCNT的形貌、微观结构、织构性质、相结构、表面元素组成和热稳定性进行了研究。用氢氧化钾腐蚀了部分倾斜的石墨层，形成了许多直径在几个到几个纳米之间的连接内外管的孔，使其具有高的比表面积(558.7 m(2)/g)、大的孔体积(1.993 cm(3)/g)和丰富的表面官能团。随后用P-CSCNT吸附废水中的亚甲基蓝(MB)。吸附结果符合朗缪尔模型，P-CSCNT的最大吸附容量高达319.1 mg/g，这归因于多种吸附机制，包括孔填充、氢键、pi-pi和静电相互作用。准二级动力学模型能更好地描述吸附行为。此外，P-CSCNT具有良好的可回收性和可重用性。这些结果表明，PCSCNT在废水处理中具有潜在的应用前景。(C)2015 Elsevier Inc.保留所有权利。
Novel porous cup-stacked carbon nanotube (P-CSCNT) with special stacked morphology consisting of many truncated conical graphene layers was synthesized by KOH activating CSCNT from polypropylene. The morphology, microstructure, textural property, phase structure, surface element composition and thermal stability of P-CSCNT were investigated by field-emission scanning electron microscope, transmission electron microscope (TEM), high-resolution TEM, N-2 sorption, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and thermal gravimetric analysis. A part of oblique graphitic layers were etched by KOH, and many holes with a diameter of several to a doze of nanometers connecting inner tube with outside were formed, which endowed P-CSCNT with high specific surface area (558.7 m(2)/g), large pore volume (1.993 cm(3)/g) and abundant surface functional groups. Subsequently, P-CSCNT was used for adsorption of methylene blue (MB) from wastewater. Langmuir model closely fitted the adsorption results, and the maximum adsorption capacity of P-CSCNT was as high as 319.1 mg/g. This was ascribed to multiple adsorption mechanisms including pore filling, hydrogen bonding, pi-pi and electrostatic interactions. Pseudo second-order kinetic model was more valid to describe the adsorption behavior. Besides, P-CSCNT showed good recyclablity and reusability. These results demonstrated that PCSCNT had potential application in wastewater treatment. (C) 2015 Elsevier Inc. All rights reserved.