| Autor: |
Perlova, O. V., Dzyazko, Yu. S., Karimova, M. E., Palchik, O. V., Ponomaryova, L. M., Kolomiiets, E. O. |
| Předmět: |
|
| Zdroj: |
Chemistry, Physics & Technology of Surface / Khimiya, Fizyka ta Tekhnologiya Poverhni; 2024, Vol. 15 Issue 4, p561-573, 13p |
| Abstrakt: |
Sources of U(VI) compounds in groundwater and surface waters are uranium-containing minerals and anthropogenic activities: nuclear and thermal power plants, enrichment plants, mines, nuclear weapons testing. Due to the toxicity and radioactivity of compounds of this metal, their content in water is strictly regulated. For the removal of small amounts of U(VI) from water, the most appropriate methods are adsorption and ion exchange. In this work, a magnetite-containing composite adsorbent based on cellulose obtained from corn cobs was developed. The advantages of the composite over synthetic adsorbents are cheap and available raw materials for its production, as well as a simple synthesis procedure. To ensure a high magnetite content (» 13.5 wt. %), hydrophilic and hydrophobic components were removed from the cellulose before modification. The porous structure of the composite and magnetite is formed, in particular, by mesopores with a size of 10 nm, and pure cellulose is characterized by a microporous structure. Compared with this material, the composite demonstrates a wider pH range for the adsorption of U(VI) compounds. The most favorable conditions are realized at pH 4–6, when the degree of uranium removal reaches 87–97%. The composite is characterized by a synergistic effect: it demonstrates the fastest adsorption than magnetite and cellulose. In addition, a higher adsorption monolayer capacity was found for the composite (0.71 mmol g–1 ) compared to magnetite (0.14 mmol g–1 ). For utilization, the adsorbent can be added to uranium-containing ore before its processing. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
