Polyvinylbenzyl Tris-Aminodicarboxylate Microspheres for the Optical Sensing of Cu2+ Ions ()
ABSTRACT
In this work, a tris(2-aminoethyl)aminodicaboxylate
functionality was substituted for the chloride of polyvinyl-benzyl chloride (PVBC) which was
lightly cross-linked (2%)
with divinyl benzene. The resulting derivatized polymer microspheres were embedded in a hydrogel matrix
of poly vinyl alcohol cross-linked with glutaraldehyde to produce a sensing
membrane. The latter responded selectively to Cu2+ solutions of
different concentration ranges (1 × 10-4 M to 1 × 10-6 M). The response is based on the
interaction between the metal cations and the negatively charged deprotonated
dicarboxylate functional group, which led to neutralization of the charges. As
a result, an increase in the turbidity of the sensing membrane occurred which
is attributed to a change in the refractive index of the derivatized polymer microspheres
relative to that of the hydrogel. The change in the turbidity of the sensing
membrane was measured as absorbance using a conventional spectrophotometer. It
was found that Cu2+ ions bind to the aminodicarboxylated-polymer with a formation constant, Kf, of 1 ×
105 M-1. SEM, Eds and IR analyses were performed on the
aminodicarboxylated microspheres and their Cu2+ complex.
Share and Cite:
Z. Shakhsher, I. Shqair, H. Qasim and I. Odeh, "Polyvinylbenzyl Tris-Aminodicarboxylate Microspheres for the Optical Sensing of Cu
2+ Ions,"
American Journal of Analytical Chemistry, Vol. 5 No. 2, 2014, pp. 122-127. doi:
10.4236/ajac.2014.52015.