Synthesis and Application of Heavy Metal Capturing Agent Salicylaldehyde Schiff Base

A heavy metal capturing agent,salicylaldehyde Schiff base N,N′-bis(2-salicylaldehyde-iminoethyl)-2,6-pyridinedicarboxylic diamide(Ⅱ),was synthesized with 2,6-pyridinedicarboxylic acid,ethylenediamine and salicylaldehyde as raw materials.And then it reacted as a ligand with some heavy metal ions such as Cu2+,Pb2+,Hg2+,Cr3+.The result showed that the ligand could react with the heavy metal ions to obtain chelates,which was insoluable in water and had high stability,so it could remove heavy metal ions in wastewater.