Abstract
The peculiarities of sorption removal of uranium (VI) compounds from the surface and mineralized groundwater using clay-supported nanoscale zero-valent iron (nZVI) composite materials are studied. Representatives of the main structural types of clay minerals are taken as clays: kaolinite (Kt), montmorillonite (MMT) and palygorskite (Pg). It was found that the obtained samples of composite sorbents have much better sorption properties for the removal of uranium from surface and mineralized waters compared to natural clays and nZVI.It is shown that in mineralized waters uranium (VI) is mainly in anionic form, namely in the form of carbonate complexes, which are practically not extracted by pure clays. According to the efficiency of removal of uranium compounds from surface and mineralized waters, composite sorbents form a sequence: montmorillonite-nZVI > palygorskite-nZVI > kaolinite-nZVI, which corresponds to a decrease in the specific surface area of the pristine clay minerals.
Highlights
Pollution of the water basin in sites where uranium ore is mined and processed is one of the most important environmental problems, requiring an effective and rational solution [1]
Materials based zero valence iron for purification of uranium-contaminated surface andsurface mineralized materials basedonon zero valence iron for purification of uranium-contaminated and groundwater, which is typical for areas of uranium ore mining and processing.In terms of sorption mineralized groundwater, which is typical for areas of uranium ore mining and processing.In terms capacity, the composite samples form a samples sequence: form montmorillonite-nanoscale zero-valent iron (nZVI)
Kaolinite-nZVI, which corresponds to a decrease in the specific surface area of the pristine clay minerals
Summary
Pollution of the water basin in sites where uranium ore is mined and processed is one of the most important environmental problems, requiring an effective and rational solution [1]. Contaminated groundwater in places of extraction and processing of uranium ores, in addition to the high content of compounds, is characterized by high mineralization The latter is a few grams per litre, mainly due to sulfates of Ca and Mg, which are formed due to the use of sulfuric acid in the technological processes of leaching [6]. Suspensions based on nZVI can be pumped into the ground along the path of groundwater directly in front of contaminated areas They are carried with underground streams, promoting the decomposition of organic toxicants or sorption of inorganic pollutants on themselves. While considerable experimental material accumulated on the purification of uranium-containing water using nZVI, there was no comparative study of the sorption properties of iron-containing composites of different composition based on clay minerals. Taking into account the importance of environmental studies based on natural minerals, the removal of uranium by nZVI supported on kaolinite, montmorillonite and palygorskite was investigated, including the removal efficiency of uranium from contaminated groundwater with low and high mineralization
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