摘要
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-1 and a total pore volume of 0.99 cm3·g-1. 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-1 was obtained by using MNC, slightly higher than that of 220.4 mg·g-1 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.
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-1 and a total pore volume of 0.99 cm3·g-1. 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-1 was obtained by using MNC, slightly higher than that of 220.4 mg·g-1 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.
基金
financially supported by the Fundamental Research Funds for the National Natural Science Foundation of China(Nos.21071107,21277094,and21103119)
Production and Research Collaborative Innovation Project of Jiangsu Province(No.BY2012123)
Natural Science Foundation of Jiangsu Province(No.BK2012167)
Scienceand Technology Pillar Program(Industry)of Jiangsu Province(No.BE2012101)
Collegiate Natural Science Fund of Jiangsu Province(Nos.12KJA430005,09KJB30003,and11KJB430012)
Key Laboratory for Environment Functional Materials of Suzhou(No.SZS201008)
A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),Applied Basic Research Project of Suzhou(No.SYG201242)
Industrial Surport Project of Suzhou(No.SG201138)
Jiangsu Key Laboratory of Material Tribology(No.Kjsmcx2011001)
Jiangsu Key Laboratory for Photon Manufacturing(No.GZ201111)
Jiangsu Provincial Key Laboratory for Interventional Medical Devices(No.Jr1210)
Creative Project of Postgraduate of Jiangsu Province(No.CXZZ11_0954)
