Comprehensive use of natural clinoptylolite in environmental protection technologies

Abstract

With the expansion of the variety of environmentally friendly materials in environmental protection technologies, in particular in the processes of sorption and ion exchange, the use of native or modified forms of clinoptilolites is quite effective. Therefore, most research on zeolites focuses on the study of ion exchange and sorption properties of these materials for natural and wastewater treatment. Nevertheless, studies of the catalytic properties of these minerals are quite promising, which can be effectively used in the purification of gas emissions. Given the cheapness, availability, prevalence in Ukraine and high performance, modified zeolite-clinoptilolite can be successfully used as a catalyst for the oxidation of carbon monoxide, while providing a fundamentally waste-free environmentally friendly technology. Having a structure filled with channels with a large number of inlets on the surface, clinoptilolite is effectively used to absorb cations that can pass through the molecular window (3.5-4.8 A), and to replace the exchange cations of the mineral itself. They are used in petrochemistry for dehumidification and purification of gases, in construction, for purification of natural and technical waters, for extraction of radionuclides, for improvement of quality of soils, as a feed additive. Successfully used in water treatment of heavy metal ions Mn, Cu, Cr. To increase the efficiency of extraction and expansion of a number of absorbed metal ions, modification of these materials is used in various ways.When combining zeolites with metal oxides embedded in their pores, due to the combination of structural-adsorption and physico-chemical properties, catalysts based on clinoptilolite are widely used.To evaluate the possibility of using the modified MnO2 natural zeolite of the Sokyrnytsia deposit as an oxide-manganese catalyst in the processes of catalytic oxidation of CO obtained by fixing a divalent manganese ion in the zeolite phase with its subsequent oxidation by permanganate ion, and its further application properties of unmodified and modified clinoptilolite.Versatility is provided not only by the possibility of obtaining a catalyst without pre-treatment of zeolite, using also spent sorbents for purification of manganese-containing natural waters, which are inherent in Ukraine, but also safety in case of burial or storage in landfills.