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The purification of heavy metal ions in waste water has become a crucial environmental issue owing to serious effect of heavy metal ions on an ecosystem.Heavy metal ions are not only hard to remove but also accumulated in living tissues,human as a high-predator being suffered more intensely than animals and plants.Arising from rapid industrialization and reclamation,heavy metal ions have been released for several decades into water from swages in industrial activities such as metal plating,mining,smelting,battery manufacture,printing and pesticides.