5Li Y H, Wang S G, Zhang X F, et al. Adsorption of fluoride from water by aligned carbon nanotubes [J]. Materials Research Bulletin, 2003, 38: 469-476.
6Mahramanlioglu M, Kizileikli I, Bicer I O. Adsorption of fluoride from aqueous solution by acid treated spent bleaching earth [J]. Journal of fluorine chemistry, 2002, 115: 41-47.