Preparation of Adsorbents Loaded with Amino Groups for the Separation of Zinc Ions
A novel modified resin(CH90-PDA-PEI)with high zinc ion adsorption capacity and easy regeneration was prepared using iminodiacetic acid chelating resin(CH90)as the matrix,polydopamine(PDA)as the crosslinking agent,and by grafting polyethyleneimine(PEI)onto the surface of the matrix.A series of characterizations and tests were conducted.The results show that,compared with traditional anion exchange resin(717),at 278 K,CH90-PDA-PEI exhibits a maximum zinc(Ⅱ)adsorption capacity of 160.4 mg/g and a selective separation factor of 159.31.In dynamic adsorption tests using real steel mill wastewater,the adsorption performance of CH90-PDA-PEI increased by 26.9％ compared to that of 717 resin,while water consumption during regeneration was reduced by 6.7％ .Additionally,CH90-PDA-PEI maintained stable performance during cycling tests.
polydopaminepolyethylenimineco-crosslinkingseparation of Zn(Ⅱ)/Fe(Ⅱ)adsorption of Zn(Ⅱ)
万方数据
维普
