ESTIMATION OF THE SELECTIVITY OF THE ACTIVE CENTERS OF SORBENTS DURING SORPTION OF ECOTOXICANTS FROM MULTICOMPONENT SOLUTIONS

A method for assessing the selectivity of active centers upon sorption of sorbates from multicomponent solutions containing three or more pollutants is proposed. The method is based on comparison of the values of specific sorbent capacity for each of the sorbates when they are extracted from single-pollutant (one pollutant) and multipollutant (all contaminants simultaneously) solutions. Both stationary and flowing solutions to be studied contained close and significantly different initial concentrations of eco-pollutants. At the first stage, stationary solutions contained a single pollutant (then all three at the same time) at a given equal (close) initial concentration, the sorbent mass in them being fixed strictly. At a given moment of time фi, the capacity of the sorbent Qi for each sorbate is estimated. Then the same experiment is carried out with the solutions containing all three pollutants simultaneously. If Qi (фi = const) does not depend on the presence of other pollutants, then the selectivity of the active centers of the sorbent takes place. If it decreases with the introduction of other pollutants, the selectivity isabsent. At the second stage, the same experiment is carried out in the flow solutions, and at the third stage at the concentration of one the sorbate (10 – 100 times) lower than that of others (flow media). In all cases, the value Qi of each i-th sorbate is also estimated and the same theoretical analysis is carried out. Results of sorption of metal cations (Me (II)) (iron group) on glauconite at practically identical their initial concentrations and Ni (II) from media with high (more than 100-fold) content of hardness cations (Ca (II) and Mg (II)) are presented as an example. The high selectivity of the active sorbent centers is shown.

1. Zhizhaev A. M., Merkulova E. N. The interaction of copper (II) and zinc (II) with co-precipitation from sulfate solutions on natural calcium carbonates / Zh. Prikl. Khim. 2014. Vol. 87. N 1. P. 388 – 396 [in Russian].

2. Belenova S. V., Vigdorovich V. I., Shel’ N. V., Tsygankova L. E. Sorption ability of natural sorbents / Vestn. Tambov. Univ. 2015. Vol. 20. N 2. P. 388 – 396 [in Russian].

3. Egirany D. E., Baker A. R., Andrews J. E. Copper and zinc removal from aqueous solution by mixed mineral systems: I Reactivity and removal kinetics / J. Coll. Interface Sci. 2005. Vol. 291. N 2. P. 319 – 325.

4. Belova T. P. Adsorption of manganese and lead by natural zeolite from aqueous solutions / Sorbts. Khromatogr. Prots. 2015. Vol. 15. N 5. P. 630 – 635 [in Russian].

5. Vigdorovich V. I., Tsygankova L. E., Filippova O. B., Shel’ N. V., Esina M. N., Frolov A. I. Glauconite as an environmentally friendly sorbent for softening the drinking and nutritive water boiler / Khim. Tekhnol. 2016. Vol. 17. N 3. P. 129 – 137 [in Russian].

6. Venetsianov E. V., Rubinshtein R. N. Dynamics of sorption from liquid media. — Moscow: Nauka, 1983. — 240 p. [in Russian].