6
M. S. ENGIN ET AL.
of Cr(VI) ions decreased with number of runs; the resulting
Cr(VI) amount was about 50% lower than the initial con-
centration. These transport experiments were performed
at a time of 2 months. When the experiments were com-
pleted, no structural deformation was observed in the
membranes. Besides, membranes were preserved in puri-
fied water after each experiment.
Funding
This study was supported by GiresunUniversity (FEN-BAP-A-
140316-63) Scientific Research Project.
References
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4. Conclusion
In the presented study, a new calix@membrane was
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Donnan dialysis method was evaluated to remove Cr(VI)
ions from aqueous solutions using calix@membrane. The
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−
ing anions (Cl−, CO32−, NO3 ) was investigated.
The flux of Cr(VI) decreased in the presence of
different anions in the feed phase and the order
−
of flux was found as Cl− > CO32− > NO3 .
(4) The transport experiments were performed
using the same membrane four times with 24-h
periods. It was observed that the transport of
Cr(VI) ions decreased with the number of runs.
The resulting Cr(VI) amount was about 50%
lower than the initial concentration.
(5) Using Donnan dialysis method for removing
Cr(VI) from aqueous solution seems to be a
feasible method, especially with the calix@
membrane.
(6) The amino units of calix@membrane are proto-
nated in acidic conditions, and the protonated
sides of calix@membrane would form com-
−
plexes with HCr2O7 by electrostatic attraction
and hydrogen bonding. In addition, the cooper-
ative effect of free dimethylamine units of calix-
arene derivative also contributed a critical role
in the construction of this complex.
Disclosure statement
(27) Kalaiselvi, G.; Maheswari, P.; Mohan, D.; Balasubramanian,
S. Sep. Purif. Technol. 2015, 143, 105–114.
No potential conflict of interest was reported by the authors.