Method for preparation of activated carbon nano-iron composite material from kandelia candel leaf

The invention discloses a method for preparation of an activated carbon nano-iron composite material from kandelia candel leaf. The method adopts activated carbon as the carrier, uses polyphenol, flavone, caffeine and other bioactive reductants contained in a kandelia candel leaf extracted liquid to reduce ferrous ions into zero valent nano iron. The activated carbon nano-iron composite material combines the adsorption properties of activated carbon with the strong reducibility of nano-iron organically, and improves the adsorption and reduction properties of the composite material when appliedto printing and dyeing wastewater treatment. The method provided by the invention has no need of using potassium borohydride, sodium borohydride or other reducing agent, is low in production cost andhas small harm to the environment, the prepared activated carbon nano-iron composite material overcomes the disadvantages of easy inactivation and agglomeration of nano-iron in water, difficult recovery and recycling and the