Анодные процессы на серебряном электроде в кислых тиокарбамидно-цитратных растворах
Дата
2016
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DOI
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Видавець
НТУ "ХПИ"
Анотація
Рассмотрены анодные процессы на серебряном электроде в тиокарбамидных растворах в присутствии цитратной кислоты. Установлено образование стойких комплексных соединений серебра (I) в указанных растворах, изучены основные кинетические закономерности протекания анодных процессов, показано характерное влияние органических веществ – тиокарбамида и цитратной кислоты, их концентраций и режима поляризационных исследований на скорость протекания анодных реакций. Определена лимитирующая стадия анодной реакции и механизм растворения серебра в кислых тиокарбамидно-цитратных электролитах.
Сonsiders the anodic processes on silver electrode in thiourea solutions in the presence of citrate acid. Determine the formation of constant complex compounds of silver (I) in the indicated solutions is established, the basic kinetic lows of anodic processes are studied, the influence of organic compounds – thiourea, citrate acid, their concentration and mode of the polarization research on the anodic reaction rate are showed in the paper. The first stage of the process is the reaction of anodic silver-impact ionization one electron. Silver forms with thiourea sustainable integrated connections, and citrate acid contributes to better its solubility and stability of electrolyte. Defined stage which limits anodic processes and the mechanism of dissolution of silver in acidic thiourea-citrate solution. The release of oxygen at low values of current does not occur, since the surface of the silver is in the active state is not achieved and the potential for discharge of gaseous oxygen. The anodic current efficiency ranges from ninety to one hundred percent.
Сonsiders the anodic processes on silver electrode in thiourea solutions in the presence of citrate acid. Determine the formation of constant complex compounds of silver (I) in the indicated solutions is established, the basic kinetic lows of anodic processes are studied, the influence of organic compounds – thiourea, citrate acid, their concentration and mode of the polarization research on the anodic reaction rate are showed in the paper. The first stage of the process is the reaction of anodic silver-impact ionization one electron. Silver forms with thiourea sustainable integrated connections, and citrate acid contributes to better its solubility and stability of electrolyte. Defined stage which limits anodic processes and the mechanism of dissolution of silver in acidic thiourea-citrate solution. The release of oxygen at low values of current does not occur, since the surface of the silver is in the active state is not achieved and the potential for discharge of gaseous oxygen. The anodic current efficiency ranges from ninety to one hundred percent.
Опис
Ключові слова
анод, растворение, серебро, тиокарбамид, цитратная кислота, концентрация, потенциал, плотность тока, anode, dissolution, silver, thiourea, citrate acid, concentration, potential, current density
Бібліографічний опис
Смирнова О. Л. Анодные процессы на серебряном электроде в кислых тиокарбамидно-цитратных растворах / О. Л. Смирнова, М. А. Беляк // Вісник Нац. техн. ун-ту "ХПІ" : зб. наук. пр. Сер. : Хімія, хімічна технологія та екологія. – Харків : НТУ "ХПІ", 2016. – № 35 (1207). – С. 96-101.