Study on Adsorbing of Heavy Metal Ions in Electroplating Waste Water by Modified Chitosan
LOU Dao-cheng, YI Ping-gui, LIU Jun-feng, HU Zhong-yu (Department of Chemical Engineering, Xiangtan Polytechnic University, Xiangtan 411201, China)
A natural macromolecule adsorbent - modified chitosan (VCG) was prepared by using chitosan with vanillin. The adsorption effect of VCG to heavy metal ions as Pb2+, Cu2+, Zn2+, Cd2+ and Ni2+ was studied under static state condition. The results showed that VCG had better adsorbability for heavy metal ions, moreover pH of solution was the main factor affecting adsorption and complex reaction was the dominating adsorptive mode. The removing rates of these heavy metal ions were over 97% in the different solutions respectively containing 30 mg/L Pb2+, Cu2+, Zn2+, Cd2+ or Ni2+ after two hours adsorbed by VCG at pH=4 and 25 ℃. Adsorbed by VCG, electroplating wastewater containing nickel (Ⅱ) was in accordance with the discharging standard of China.
【CateGory Index】： X781