Adsorption Of Cu2+ Ions On Modified Forms
ADSORPTION OF Cu2+ IONS ON MODIFIED FORMS
OF TRANSCARPATHIAN CLINOPTILOLITE
V. Gomonay1, N. Golub1, S. Milyovich1, K. Szekeresh1,
P. Gomonay1, R. Leboda2
1Uzghorod National University, Uzghorod, Ukraine
2Maria Curie-Sklodowska University,
Maria Curie-Sklodowska sq.3, 20-031 Lublin, Poland
Cuprum is a part of the structure of living organisms and plays the important role in the process of proteins synthesis of the derivation of blood and other biological processes. At the same time the exceeding of its concentration in the potable water results inhibition of processes of exaltation in the head brain, violation of processes of the ferum digestion, water and salt balance. Therefore, the purification of water from the cuprum ions represents the considerable interest [1].
The series of experiments were conducted in the static conditions with the stationary values by intermixing of solution. Kinetics of the ion exchange was monitored with the help of ion-selective electrodes "Radelkis". The ion-selective electrodes permit the determination of the ions concentration with the adequate precision in the given concentration range. It was simultaneously possible to meter the concentration of eight ions in the solution.
The processing of the natural clinoptilolite (Z-0) with solutions NaCI, Nh4CI, HCI, and also with the processes of puncturing brings to the considerable change of their ion-exchange capacities in relation to the ions of cuprum.
It was exhibited after the method of the rentgen-fluorescent analysis XRF was used, that in the firm samples of the sorbent the contents of cuprum after the adsorption coincides with the adsorption capacity:
Sorbent
Z-0
Z-K
Z-NH4
Z-Na
Limiting adsorption, mg/g
1,73
1,86
2,57
2,24
Contents Cu, relative %
32,476
34,102
39,638
43,229
*Initial cocentration of ions Cu 2+ = 250 mg/l.
Having conducted the series of experiments, we have set out that the concentration of the initial solution affects the adsorption size: while the concentration of the initial solution augments, the adsorption size increases and when the concentration reaches 0,0933 mol/l it arrives to the limit significance 58 mg/g (fig.1).
The further augmentation of the concentration of the cuprum ions in the solution does not bring to the augmentation of the adsorption size. It is connected with the fact that with the big concentrations of the cuprum ions Сu²+ in the solution with the ionic exchange is approaching the balance
, the concentration of sodium ions in the solution increases to such significances, that the reverse process of de-sorb of the cuprum ions to the solution starts.
It has appeared, that not only the sodium ion Na+ but other cations as well exchange from the crystalline trellis of the zeolite. For example, while adsorption of the cuprum ions takes place on the modified clinoptilolite Z-NH4 in the solution, the ions of sodium, potassium and ammonium were revealed (fig.2).
References
1. Gomonaj V.I., Golub N.P., Gomonaj P.V. Szekeresh K.Yu. Ion-exchange property of natural zeolitez from Transkarpaty // Adsorption Science and Technology. – 1999. Vol.17. N 5. – P.126-131.
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