Adsorption Properties of Novel Chelating Resins Containing 2-Amino-5-Methylthio-1,3,4-Thiadizole and Hydrophilic Spacer Arms for Hg2+ and Ag+

作者：Wang, Chunrong; Ji, Chunnuan^*; Meng, Yanfeng; Liu, Li; Qu, Rongjun; Wang, Chunhua

来源：Journal of Applied Polymer Science, 2010, 116(2): 636-644.

DOI：10.1002/app.31586

• ion exchangers
• polystyrene
• resins

The adsorption properties, including the adsorption kinetics, adsorption isotherms, and adsorption selectivity, of newly formed chelating resins that contained a heterocyclic functional group and a hydrophilic spacer arm of poly(ethylene glycol) [polystyrene-diethylene glycol-2-amino-5-methylthio-1,3,4-thiadizole (PS-DEG-AMTZ) and polystyrene-triethylene glycol-2-amino-5-methylthio-1,3,4-thiadizole (PS-TEG-AMTZ)] were studied in detail. The results show that the adsorption kinetics of PS-DEG-AMTZ and PS-TEG-AMTZ for Hg2+ and Ag+ could be described by a pseudo-second-order rate equation. The introduction of a spacer arm between the polymeric matrix and functional group was beneficial for increasing the adsorption rates. The apparent activation energies of the resins for Hg2+ and Ag+ were within 20.89-32.32 kJ/mol. The Langmuir model could describe the isothermal process of Hg2+ and Ag+. The competitive adsorption of the resins for Hg2+ and Ag+ in binary mixture systems was also investigated. The results show that Hg2+ and Ag+ were adsorbed before the other metal ions, such as Cu2+ , Zn2+ , Fe2+ , Cd2+ , and Pb2+ , under competitive conditions. Five adsorption-desorption cycles were conducted for the reuse of the resins. The results indicate that these two resins were suitable for reuse without considerable changes in the adsorption capacity.

• 出版日期2010-4-15
• 单位鲁东大学