The invention discloses a preparation method of modified
activated carbon used for heavy
metal wastewater treatment. The preparation method comprises the steps that firstly,
activated carbon is washed, dried, ground, sieved and soaked, so that pores of the
activated carbon are filled with water; secondly, clean air is blown so that the activated carbon can be in a boiling state, and an
oxidizing agent is sprayed for controllable oxidation; thirdly, N-(2,3-glycidyl)
iminodiacetic acid disodium allows
iminodiacetic acid disodium to be connected to the surface of the activated carbon through
epoxy group ring opening. According to the prepared modified activated carbon, hydroxyls, carboxyls and
iminodiacetic acid groups having a strong effect on heavy
metal ions are introduced only on the surface, the original hole channel structure feature of the activated carbon is maintained, the capacities of strong heavy
metal adsorption and organic
pollutant removal are both achieved, and the dual purposes of removing heavy metal and organic
pollution can be achieved by one step through adsorption via activated carbon. Meanwhile, the adsorbed heavy metal is easy to recycle, the activated carbon is easy to regenerate, the cycle service life of the activated carbon is long, no secondary
pollution will occur, and therefore the preparation method has good application and popularization prospects.