Seversk Technological Institute – Branch of National Research Nuclear University “MEPhI” (Seversk, Russia)

Ya. B. Chubenko, Associate Professor of the Department of Chemistry and Technology of Materials of Modern Power Engineering, Candidate of Technical Sciences, yana-sti@bk.ru
А. V. Muslimova, Associate Professor of the Department of Chemistry and Technology of Materials of Modern Power Engineering, Candidate of Chemical Sciences, klameri@mail.ru
P. B. Мolokov, Head of the Department of Chemistry and Technology of Materials of Modern Power Engineering, Candidate of Technical Sciences, Associate Professor, pbmolokov@mephi.ru
Е. А. Zelichenko, Associate Professor of the Department of Chemistry and Technology of Materials of Modern Power Engineering, Candidate of Technical Sciences, zelichenko65@mail.ru
V. V. Guzeev, Professor of the Department of Chemistry and Technology of Materials of Modern Power Engineering, Doctor of Technical Sciences, uranilf@yandex.ru

High-purity organic and inorganic fluorine-containing gases are essential materials for the semiconductor industry. Most of these gases are imported into Russia, while several compounds, including tungsten hexafluoride, nitrogen trifluoride, boron trifluoride, and hexafluorobutadiene, are currently produced or planned for production by Russian enterprises. The stringent purity requirements for tungsten hexafluoride significantly complicate its production: the total impurity content must not exceed 10 ppm at a minimum concentration of 99.999%, as even trace impurities may result in product defects or damage to expensive manufacturing equipment. Therefore, the development of reliable analytical methods for the quantitative determination of tungsten hexafluoride, the modification of analytical equipment for operation in corrosive environments, and the treatment of tungsten-containing wastewater are of considerable practical importance. Several techniques, including chromatography and infrared spectroscopy, employ alkaline solutions to capture tungsten hexafluoride from exhaust gases. The present study substantiates the feasibility of using a cellulose-based composite material for the recovery of tungsten from aqueous sodium tungstate solutions. Scanning electron microscopy revealed a well-developed porous structure on the surface of carbon fiber coated with a layer based on spinning waste solution, with the predominant pore size ranging from 1.0 to 2.0 μm. Qualitative analysis confirmed tungsten deposition on the sorbent surface at pH 2. The composite material exhibited a tungsten sorption capacity of 25.5 mg/g and a tungsten removal efficiency of up to 90%. The sorbent also demonstrated several technological advantages. Combined with the availability and low cost of raw materials supplied by Russian manufacturers, these characteristics highlight the potential of the developed composite material for tungsten recovery from aqueous solutions.
The work was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation, scientific and technical report “Laboratory of physical and chemical methods for analysis of high-purity fluorinated gases for electronics”, FSWU-2025-0013.

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