WATER PURIFICATION FROM HYDROGEN SULPHIDE USING CLINOPTYLOLITE MODIFIED WITH MANGANESE OXIDES
DOI:
https://doi.org/10.20535/2218-930032025348678Keywords:
clinoptilolite, hydrogen sulphide, manganese oxides, modification, sorbent, water purificationAbstract
Hydrogen sulphide is 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 MnxOy particles by impregnating natural clinoptilolite with Mn(NO3)2 solutions with its subsequent decomposition under the influence of microwave electromagnetic radiation. The resulting sorbent, modified with MnxOy particles, 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 a layer 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 the H2S–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 the process 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 MnxOy particles.
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