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Alanine containing porous beads for mercury removal from artificial solutions
Author(s) -
Şenel Serap,
Kara Ali,
Karabakan Abdülkerim,
Denizli Adil
Publication year - 2006
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.23473
Subject(s) - adsorption , comonomer , aqueous solution , metal ions in aqueous solution , nuclear chemistry , suspension polymerization , chemistry , mercury (programming language) , sorption , swelling , polymerization , specific surface area , metal , polymer , polymer chemistry , materials science , organic chemistry , catalysis , composite material , computer science , programming language
Abstract N ‐methacryloyl‐( L )‐alanine (MALA) was synthesized by using methacryloyl chloride and alanine as a metal‐complexing ligand or comonomer. Spherical beads with an average diameter of 150–200 μm were obtained by suspension polymerization of MALA and 2‐hydroxyethyl methacrylate (HEMA) conducted in an aqueous dispersion medium. Poly(HEMA–MALA) beads were characterized by SEM, swelling studies, surface area measurement, and elemental analysis. Poly(HEMA–MALA) beads have a specific surface area of 68.5 m 2 /g. Poly(HEMA–MALA) beads with a swelling ratio of 63%, and containing 247 μmol MALA/g were used in the removal of Hg 2+ from aqueous solutions. Adsorption equilibrium was achieved in about 60 min. The adsorption of Hg 2+ ions onto PHEMA beads was negligible (0.3 mg/g). The MALA incorporation into the polymer structure significantly increased the mercury adsorption capacity (168 mg/g). Adsorption capacity of MALA containing beads increased significantly with pH. The adsorption of Hg 2+ ions increased with increasing pH and reached a plateau value at around pH 5.0. Competitive heavy metal adsorption from aqueous solutions containing Cd 2+ , Cu 2+ , Pb 2+ , and Hg 2+ was also investigated. The adsorption capacities are 44.5 mg/g for Hg 2+ , 6.4 mg/g for Cd 2+ , 2.9 mg/g for Pb 2+ , and 2.0 mg/g for Cu 2+ ions. These results may be considered as an indication of higher specificity of the poly(HEMA–MALA) beads for the Hg 2+ comparing to other ions. Consecutive adsorption and elution operations showed the feasibility of repeated use for poly(HEMA–MALA) chelating beads. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1222–1228, 2006