Recovery of “Hard-to-Recover” Selenate Ions in Sulfuric Acid Solutions during Polarization of Titanium Electrodes by Industrial Alternating Current
Bayeshov A. Bayeshova A. Zhanbekov K. Zhubanys M. Naguman P.
June 2022MDPI
Inorganics
2022#10Issue 6
The article is devoted to the study of selenium (VI) reduction processes in sulfuric acid solutions when titanium electrodes are polarized by alternating current of industrial frequency (50 Hz). It was found that selenate ion reduction occurs on the surface of titanium electrodes in the cathode half-cycle of alternating current (practically at the cathode) by reaction: SeO2− 4+ 6e + 8H+ → Se + 4H2 O. In addition, the recovery is carried out by titanium (III) ions: 6Ti3 + SeO2− 4+ 8H+ → Se + 6Ti4+ + 4H2 O. It has been established that titanium (III) ions are products of dissolution of titanium during polarization by alternating current, so they can be formed by reaction: 2Ti + 6H+ → 2Ti3+ + 3H2. Reduction in selenate ions during polarization by alternating current can also occur due to the cementation reaction with titanium: 3Ti + 2SeO2− 4 + 16H+ → 2Se + 8H2 O + 3Ti4+. It was shown for the first time that the selenate ion is reduced to form a dispersed selenium powder with a high current efficiency. Depending on the conditions, both amorphous and crystalline selenium modifications are produced.
alternating current , polarization , reduction , selenate ion , selenium powder , sulfuric acid solutions , titanium electrodes
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JSC “D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry”, Almaty, 050000, Kazakhstan
Centerof Physico-Chemical Methoods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, 050000, Kazakhstan
Department of Academic Affairs, Abai Kazakh National Pedagogical University, Almaty, 050000, Kazakhstan
Abai Kazakh National Pedagogical University, Almaty, 050000, Kazakhstan
Karaganda Technical University, Karaganda, 100000, Kazakhstan
JSC “D.V. Sokolsky Institute of Fuel
Centerof Physico-Chemical Methoods of Research and Analysis
Department of Academic Affairs
Abai Kazakh National Pedagogical University
Karaganda Technical University
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