Vìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ (Dec 2019)

SORPTION OF MERCURY(II) AS A COMPLEX WITH KARMOAZIN ON ANIONITE AV-17-8 IN DYNAMIC MODE

  • A. N. Chebotarev,
  • E. M. Guzenko,
  • E. M. Zhukovetska,
  • D. V. Snigur

DOI
https://doi.org/10.18524/2304-0947.2019.4(72).185565
Journal volume & issue
Vol. 24, no. 4(72)
pp. 89 – 97

Abstract

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In present paper, the kinetic features of mercury(II) adsorption from dilute aqueous solutions in a dynamic mode was studied. Using dynamic and kinetic curves that take into account the change in the rate coefficient of the sorption process versus its duration, the mechanism of the formation of adsorption layers in the sorption column during the sorption of mercury (II) in the form of its complex with 4-sulfo-2-(4′-sulfonaphthalene-1′ -azo)naphthol-1 (Carmoasine) which formed after coresponding redox-reaction by surface of the organopolymer anion exchanger AV-17-8 in dynamic mode. Azo dye carmoazine, which is a selective reagent for mercury(II), was used for its preliminary binding to a strong complex prior to sorption removal. The main process that determines the adsorption interaction in the studied system is the electrostatic attraction of the anionic complex to the positively charged surface of the anionite and the formation of a strong monolayer. The additional fixation of complex is due to the hydrophobic interactions between its molecules and the phenyl radicals of the AV-17-8 matrix. Based on the calculated mass transfer coefficients of the sorption process and the corresponding sorption isotherm, the optimal conditions for the extraction of the complex are established, namely: the volumetric rate of transmission of the sorbate through the sorption column is at least - 2 cm3/min; column diameter - 10.0 mm; the minimum weight of the sorbent is 0.05 g; the diameter of the ionite grains is 0.43 ÷ 0.50 mm. Based on the complex of the experimental results obtained and their interpretation, taking into account the known provisions, a mechanism of sorption in the dynamic mode and the formation of adsorption layers in the studied system was proposed. The data obtained can then be used to develop a test system in the form of an indicator tubes and as well as for quantitative sorption-spectroscopic determination of mercury(II) in various categories of waters.

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