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| Effect of acidification time on preparation of magnetic multi-walled carbon nanotubes and adsorption of phenanthrene in Water |
| LI Rui-juan1, DING Guang-hui1, LI Xue-yao1, ZHANG Nan-nan1, YANG Zhan-ning1, ZHANG Jing2, CUI Fu-xu2 |
1. College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China;
2. College of Environment and Chemical Technology, Dalian University, Dalian 116622, China |
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Abstract The multi-walled carbon nanotubes oxidized by mixed acids were magnetized by the co-precipitation method to form a kind of magnetic composite material of ferroferric oxide/multi-wall carbon nanotubes (MMWCNTs). The effects of acidification time on the preparation of MMWCNTs and their adsorption properties for phenanthrene in water were investigated. Experimental results indicated that the adsorption of phenanthrene was better under weak acid conditions.The adsorption of phenanthrene on MMWCNTs processed quickly within 30 minutes, and basically reached equilibrium at 60 minutes. The regression results showed that the adsorption kinetics were more accurately represented by the pseudo second-order model. The saturation adsorption capacity of phenanthrene on MMWCNTs represented a trend of increasing first and then decreasing with increasing acidification time. The maximal saturation adsorption capacity of phenanthrene on MMWCNTs was 17.56μg/mg based on MWCNTs after 7h acidification.
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Received: 07 August 2018
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