Sorption of molybdenum ions (VI) by new synthetic sorbents
Abstract
Methods for the synthesis of new anion exchangers based on glycidyl derivatives of 4.4'-oxydianiline and certain polyamines have been developed, and the optimum conditions for their preparation have been found. The composition and structure of the complexing ion exchangers were studied by IR spectroscopy and elemental analysis. Synthesized ion exchangers have a high exchange capacity - up to 11.0 mg-eq·g-1 and, accordingly, increased sorption capacity. It is established that they have high chemical and thermal stability. The loss of their capacity in solutions of acids and alkalis does not exceed 2-8%, and in solutions of oxidizing agents it is 50-52%. Good stability in aggressive chemical environments (5 N H2SO4, NaOH) and at temperature influences allows their use in various technological schemes. The method of classical polarography under static conditions has been used to study sorption of molybdenum (VI) ions by new anion exchangers based on 4.4-oxyethylenediamine and some polyamines. During the research, regimes of sorption experiments (sorbent-solution ratio, concentration and pH of molybdenum-containing model solutions and contact time), close to industrial ones, were chosen. It is established that they possess high sorption properties with respect to molybdenum (VI) ions. A sharp rise in sorption isotherms at low equilibrium concentrations indicates that these ions can be used to extract molybdenum ions with sufficient completeness. At the same time, the extraction rate reaches 77%. It has been found that the anion exchange resin based on polyethylene polyamine has a higher sorption capacity, its sorption capacity is 230.4, and in the case of polyethyleneimine it is 211.2 mg·g-1. It is shown that the acidity of the medium in the pH range 1.0-8.3 has a significant effect on the sorption of molybdate ions. Found that the obtained ion exchangers have higher kinetic properties than industrial ones, and complete chemical equilibrium occurs in 3 hours. At the same time, their sorption capacity is 460.8 and 422.4 mg·g-1, respectively.
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