Homopolymer of N,N'-bis(vinyloxyethyl)thiuramdisulphide as a Selective Sorbent of the Ions of Mercury and Precious Metals
SVETLANA V. AMOSOVA, LYUDMILA P. SHAULINA, GENNADIY V. RATOVSKIY, IRINA P. GOLENTOVSKAYA, MARIA I. SMAGUNOVA, ELENA I. BIRYUKOVA and SVETLANA A. ZHIVETYEVA
Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences,
Ul. Favorskogo 1, Irkutsk 664033 (Russia), E-mail: amosova@irioch.irk.ru
Pages: 823-827
Abstract
A homopolymer of N,N'-bis(vinyloxyethyl)thiuramdisulphide was synthesized via cationic polymerization and investigated as a sorbent of the ions of mercury and precious metals. The effect of the nature and concentration of acid, phase contact time on the extraction of metals was revealed; sorption capacities of the polymer and metal partition coefficients were estimated. It was shown that the sorbent exhibits high sorption activity to metal ions in the cationic form: with respect to mercury (Hg2+) from 1 M HNO3 solution - 1100 mg/g, 1M H2SO4 - 990 mg/g, 1 M HCl - 280 mg/g; with respect to silver (Ag+) from 1 M HNO3 - 850 mg/g, from 1 M H2SO4 - 900 mg/g. A mechanism of the interaction of active groups of the sorbent with metal ions was proposed on the basis of IR spectroscopic data. The homopolymer of N,N'-bis(vinyloxyethyl)thiuramdisulphide sorbs mercury and silver ions selectively from a mixture of copper, nickel, iron and zinc salts. The possibility to use the sorbent for concentrating precious metals and for analytical purposes was demonstrated. A method of sorbent regeneration was developed.
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