Issue 58, 2015
From the journal:

RSC Advances

Fabrication of uniform porous CNTs/activated carbon composite spheres by oil-drop method in stratified oils and their adsorption of VB12

Bingzhi Guo,abcd   Qianming Gong,*abc   Junjie Wang,abc   Yilun Huang,abc   Daming Zhuangabc  and  Ji Liange  

* Corresponding authors

a School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China

b State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, P. R. China

c Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China

d Beijing Institute of Technology, Zhuhai, Zhuhai 519088, P. R. China

e Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China

Abstract

Presented is a flexible route to prepare uniform porous carbon nanotubes/activated carbon (CNTs/AC) composite spheres with high adsorption capacity. In this work, CNTs were firstly dispersed in ethanol aqueous solution of phenolic formaldehyde (PF) resin and then the transitional CNTs/PF composite spheres were synthesized by an oil-drop method. Meanwhile the CNT suspension drops were gradually cured in stratified oils with different densities. Subsequently, after being carbonized at 600 °C, steam activated at 800 °C and followed by alkali and deionized water wash, the resultant porous CNTs/AC composite spheres were acquired with CNTs of more than 65 wt%. Remarkably, the adsorption of VB12 by the CNTs/AC composite spheres was as high as 60.36 mg g−1, which was 4.32 and 3.96 times that of activated carbon beads and macroporous resin beads, respectively. Observations and microstructure analyses indicated that the good sphericity of the CNTs/AC spheres could be attributed to the suspended state of the CNTs/PF drops during curing which was supported by the stratified oils, and that the interconnected porous structure should be developed synergistically by ethanol and water evaporation during curing, carbonization of PF resin and activation of CNTs/AC spheres.

Graphical abstract: Fabrication of uniform porous CNTs/activated carbon composite spheres by oil-drop method in stratified oils and their adsorption of VB12

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Article information

DOI
https://doi.org/10.1039/C5RA07280H
Article type
Paper
Submitted
22 Apr 2015
Accepted
20 May 2015
First published
20 May 2015

RSC Adv., 2015,5, 46997-47003

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Fabrication of uniform porous CNTs/activated carbon composite spheres by oil-drop method in stratified oils and their adsorption of VB12

B. Guo, Q. Gong, J. Wang, Y. Huang, D. Zhuang and J. Liang, RSC Adv., 2015, 5, 46997 DOI: 10.1039/C5RA07280H

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