4Yu J J, Du W, Zhao F Q, et al. High sensitive simultaneous determination of catechol and hydroquinone at mesoporous carbon CMK-3 electrode in comparison with multi-walled carbon nanotubes and Vulcan XC-72 carbon electrodes [J]. Electrochim. Acta, 2009, 54:984-988.
5Hu J, Chen C L, Zhu X X, et al. Removal of chromium from aqueous solution by using oxidized muhiwalled carbon nanotubes [J]. J. Hazard. Mater., 2009, 162: 1542-1550.
6Chen C L, Wang X K. Adsorption of Ni (II) from aqueous solution using oxidized multiwall carbon nanotubes [J]. Ind. Eng. Chem. Res., 2006, 45: 9144-9149.
7Tan X L, Chen C L, Yu S M, et al. Sorption of Ni^2+ on Narectorite studied by batch and spectroscopy methods [J]. Appl. Geochem., 2008, 23:2767-2777.
8Vasanth Kumar K, Kumaran A. Removal of methylene blue by mango seed kernel powder[J]. Biochem. Eng. J., 2005, 27:83-93.
9Fan Q H, Shao D D, Hu J, et al. Comparison of Ni^2+ sorption to bare and ACT-graft attapulgites: Effect of pH, temperature and foreign ions[J]. Surf. Sci., 2008, 602:778-785.
