Magnetic mesoporous carbon for efficient removal of organic pollutants
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Magnetic mesoporous carbon for efficient removal of organic pollutants Tongbao Wang · Lin Liang · Runwei Wang · Yanqiu Jiang · Kaifeng Lin · Jianmin Sun
Received: 18 May 2012 / Accepted: 20 September 2012 / Published online: 3 October 2012 © Springer Science+Business Media New York 2012
Abstract Carbon materials such as activated carbons have been used in the field of water and wastewater treatments. However, the lack of mesopore and, particularly, the difficulty in recovering the spent carbon limited their applications. In this work, magnetic mesoporous carbon microspheres were synthesized by impregnating iron oxide precursors in the mesoporous carbon followed by the in situ conversion of the precursors into magnetite nanoparticles. The as-synthesized carbon microspheres with a high surface area of 742 m2 /g and large mesopores of ∼4.4 nm exhibited an excellent adsorption capacity for aqueous organic pollutants. The superparamagnetic microspheres with a saturation magnetization of 7.15 emu/g can be easily separated from the treated solution by external magnetic field. Keywords Magnetic · Mesoporous carbon · One-pot synthesis · Adsorption · Organic pollutant
J. Sun () State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China e-mail: [email protected] T. Wang · Y. Jiang · K. Lin · J. Sun Natural Science Research Center, The Academy of Fundamental and Interdisciplinary Science, Harbin Institute of Technology, Harbin 150080, China L. Liang School of Life Science and Technology, Harbin Institute of Technology, Harbin 150080, China R. Wang State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
1 Introduction The Earth’s water resources are being increasingly contaminated along with the rapid developments of industry and agriculture, which pose a major environmental health risk to humankind. Particularly, the effluents from textile plants containing portions of dyes, which are deeply colored, nonbiodegradable and high toxic, have caused increasing environmental concerns (Lewis et al. 1999). Removal of pollutants by adsorption is clearly one of the most effective, economical and easily regenerated ways for environmental clean-up compared to other methods such as chemical precipitation, liquid-liquid extraction, membrane filtration, ion exchange (Li et al. 2005; Zhang et al. 2009; Mansouri et al. 2010). Mesoporous carbon materials with uniform porosity, high surface area, large pore volume, good thermal stability and chemical inertness, have gained increasing attentions in catalysis, adsorption, host-guest chemistry, environmental technology, and biomedical fields (Joo et al. 2001; Liang et al. 2008). However, it is difficult to separate mesoporous carbon materials from liquid phase because of their small particle sizes. A way to solve this is to induce magnetic nanomaterials into mesoporous carbon materials. The magnetic mesoporous carbon materials attract great interests in many field
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