Papers by Keyword: Bromine

Abstract: Theoretical and practical results on the preparation and investigation of low-melting glasses using the example of glassy chalcogenide glasses of the Ge-S-Br, Ge-Se-Br systems are presented and summarized. On the basis of fundamental properties of matter, correlations were identified with uniform positions. The glass formation regularities in the indicated chalcogenide and oxyhalide systems were determined. Areas and compositions of low-melting chalcogenide and oxyhalide glasses were considered. Approaches to obtaining of thermostable and difficult to crystallize low-melting glasses were found. Areas of their practical application were identified. On the basis of the obtained data, approaches and criteria for obtaining compositions of low-melting chalcogenide and oxide glasses with practically useful properties are formulated.

Abstract: Soda lakes located close to uranium deposits of West Mongolia contain elevated concentrations of uranium, reaching, in some cases, 1 to 3 mg/l. The concentration of uranium in the lakes of Russian Altai is lower and varies from 0.001 to 0.03 mg/l. The greatest uranium resources (about 6000 tons) are stored in Hyargas Nuur Lake, Western Mongolia. In addition to uranium and salts of sodium and magnesium increased contents of boron (up to 250 mg/l), bromine (up to 1.1 g/l), lithium (up to 600 mg/l), strontium (up to 8 mg/l) were determined in the lake waters. A scheme for complex processing of uranium-bearing lake waters, the first stage of which includes extraction of uranium using iron-containing sorbents or anion exchange resins is considered. Uranium compounds, bromine, iodine, boron, lithium and other elements found in salt lakes are an important raw material base for the production of advanced materials.

Abstract: Under visible light irradiation, the photocatalytic degradation of Br-THMs was successfully achieved. It suggested that Br-THMs were de-bromized in a stepwise manner. The more bromine substituted in Br-THMs, the more easily it can be degraded, due to C-Br bond is easier destroyed than C-Cl. A proposed degradation pathway through a series of free radical reactions was also discussed.