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Adsorption properties of novel chelating resins containing 2‐amino‐5‐methylthio‐1,3,4‐thiadizole and hydrophilic spacer arms for Hg 2+ and Ag +
Author(s) -
Wang Chunrong,
Ji Chunnuan,
Meng Yanfeng,
Liu Li,
Qu Rongjun,
Wang Chunhua
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31586
Subject(s) - adsorption , polystyrene , ethylene glycol , desorption , diethylene glycol , langmuir adsorption model , chemistry , kinetics , polymer chemistry , triethylene glycol , isothermal process , chelation , nuclear chemistry , materials science , inorganic chemistry , polymer , organic chemistry , physics , quantum mechanics , thermodynamics
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 Hg 2+ 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 Hg 2+ and Ag + were within 20.89–32.32 kJ/mol. The Langmuir model could describe the isothermal process of Hg 2+ and Ag + . The competitive adsorption of the resins for Hg 2+ and Ag + in binary mixture systems was also investigated. The results show that Hg 2+ and Ag + were adsorbed before the other metal ions, such as Cu 2+ , Zn 2+ , Fe 3+ , Cd 2+ , and Pb 2+ , 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. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010