Water purification from hydrogen sulphide using clinoptylolite modified with manganese oxides
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Дата
2025
Автори
Науковий керівник
Назва журналу
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Назва тому
Видавець
КПІ ім. Ігоря Сікорського ; ТОВ «Українська водна спілка»
Анотація
Hydrogen sulphideis contained in many types of groundwater and mine waters. These waters can serve as an additional resource for drinking water, but their thorough purification from hydrogen sulphide is necessary, since the regulatory documents in force in Ukraine do not allow the presence of H2S in drinking water. The most effective methods of water purification from H2S are oxidative-catalytic, in particular, using manganese oxides (MnxOy) deposited on a carrier as a catalyst. The authors developed a new method for modifying sorbents with MnxOyparticles by impregnating natural clinoptilolite with Mn(NO3)2solutions with its subsequent decomposition under the influence of microwave electromagnetic radiation. The resulting sorbent, modified with MnxOyparticles, was used in studies of hydrogen sulphide oxidation in model solutions with a concentration of 10 mg/L. The studies were conducted under anaerobic conditions and in the presence of oxygen, which provided air bubbling at a flow rate of 50 to 300 cm3/min through alayer of modified clinoptilolite, which was located in a glass column. The pH value of the model solution (6.0; 7.0 and 8.5) and temperature (15, 20, 25 and 30 ºС) were also variable parameters. It was found that the value of the rate constant increased not only with increasing temperature and air flow rate, but also with increasing pH of the medium. An increase in pH of the medium causes a decrease in the redox potential of the oxidant, but at the same time contributes to a shift in the equilibrium in theH2S–HS–system towards the ionic form of hydrogen sulphide. This provides a higher rate of its oxidation. The calculated values of the Van't Hoff temperature coefficient (2.0...3.7) and the activation energy of H2S oxidation (53...67 kJ/mol) indicate that theprocess proceeds in the kinetic region. It was established that at pH from 7.0 and above and at an air flow rate of about 200 cm3/min (under experimental conditions), the degree of hydrogen sulphide oxidation within 60 min approaches 100%. Thus, the conducted studies confirmed the high efficiency of the obtained sorbent modified with MnxOyparticles.
Опис
Ключові слова
clinoptilolite, hydrogen sulphide, manganese oxides, modification, sorbent, water purification, клиноптилоліт, мангану оксиди, модифікування, ефективність очищення води., сірководень, сорбція
Бібліографічний опис
Pyrih, M. Water purification from hydrogen sulphide using clinoptylolite modified with manganese oxides / Marta Pyrih, Zenovii Znak // Вода і водоочисні технології. Науково-технічні вісті. – 2025. – № 3(43). – С. 15-24. – Бібліогр.: 18 назв.