INTERACTION OF SODIUM SELENITE WITH SODIUM HYDROXYMETHANESULFINATE AND THIOUREA DIOXIDE IN AQUEOUS SOLUTIONS
Abstract
The reactions between sodium selenite and sodium hydroxymethanesulfinate (HMS) or thiourea dioxide (TDO) in aqueous solutions have been studied. It is shown that selenium and selenide are the intermediate and final products of these reactions, respectively. The conditions (pH, concentrations, ratio of the reagents) for the synthesis of selenium and selenide are determined. The size of the selenium particles synthesized with sodium hydroxymethanesulfinate depends mostly on pH, concentrations and ratio of the reagents as well as the age of the solution. The optimum conditions for the synthesis of the selenium with particle size nearly 100 nm are: neutral solutions, age of the solution nearly 10 min (the age of solutions longer than a few hours leads to the synthesis of the selenium with particle size nearly 500 nm). The most preferable for the synthesis of selenides are weakly acidic solutions and the excess of HMS. The mechanism of redox reaction comprises of the decomposition of hydroxymethanesulfinate with the formation of the active reductant – sulfoxylate and its reactions with selenite and selenium. In contrast to reaction between hydroxylmethanesulfinate and selenite, its reaction with thiourea dioxide does not proceed in weakly acidic and neutral solutions. Selenite is reduced in alkaline solutions. Selenium and selenide are the intermediate and final products of these reactions, respectively. Independently of the concentrations of the thiourea dioxide and selenite as well as a ratio of these concentrations, the reduction of selenite with thiourea dioxide does not lead towards the formation of relatively large (300-500 nm) particles of selenium, since the aggregation of particles proceeds slower than the reduction of selenium. It is shown that, like with hydroxymethanesulfinate, selenite and selenium react with the product of the TDO decomposition – sulfoxylate.
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