Adsorption of phenol from aqueous solution by a hierarchical micro-nano porous carbon material
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- 作者：Chengbao Liu (1) (3)
Zhigang Chen (1) (2) (3) (5)
Chaoying Ni (4)
Feng Chen (1) (3)
Cheng Gu (5)
Yu Cao (3)
Zhengying Wu (1) (3)
Ping Li (1) - 关键词：micro ; nano porous carbon materials ; expanded graphite ; activated carbon ; phenol adsorption ; kinetics
- 刊名：Rare Metals
- 出版年：2012
- 出版时间：December 2012
- 年：2012
- 卷：31
- 期：6
- 页码：582-589
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Zhigang Chen (1) (2) (3) (5)
Chaoying Ni (4)
Feng Chen (1) (3)
Cheng Gu (5)
Yu Cao (3)
Zhengying Wu (1) (3)
Ping Li (1)
1. Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou, 215009, China
3. Department of Chemistry and Bioengineering, Suzhou University of Science and Technology, Suzhou, 215009, China
2. Jiangsu Provincial Key Laboratory for Interventional Medical Devices, Huaiyin Institute of Technology, Huaian, 223003, China
5. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China
4. Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA - ISSN：1867-7185
文摘
A hierarchical micro-nano porous carbon material (MNC) was prepared using expanded graphite (EG), sucrose, and phosphoric acid as raw materials, followed by sucrose-phosphoric acid solution impregnation, solidification, carbonization and activation. Nitrogen adsorption and mercury porosimetry show that mixed nanopores and micropores coexist in MNC with a high specific surface area of 1978 m2·g? and a total pore volume of 0.99 cm3·g?. In addition, the MNC is found to consist of EG and activated carbon with the latter deposited on the interior and the exterior surfaces of the EG pores. The thickness of the activated carbon layer is calculated to be about one hundred nanometers and is further confirmed by scanning electron microscope (SEM) and transmission election microscope (TEM). A maximum static phenol adsorption of 241.2 mg·g? was obtained by using MNC, slightly higher than that of 220.4 mg·g? by using commercial activated carbon (CAC). The phenol adsorption kinetics were investigated and the data fitted well to a pseudo-second-order model. Also, an intra-particle diffusion mechanism was proposed. Furthermore, it is found that the dynamic adsorption capacity of MNC is nearly three times that of CAC. The results suggest that the MNC is a more efficient adsorbent than CAC for the removal of phenol from aqueous solution.