Se(IV) Immobilization onto Natural Siderite: Implications for High‐Level Nuclear Waste Repositories. Issue 7 (7th May 2021)

• Record Type: Journal Article
• Authors: Pavón, Sandra; Martínez, Maria; Giménez, Javier; de Pablo, Joan
• Is Part Of: Chemical engineering & technology. Volume 44:Issue 7(2021)
• Page Start: 1160
• Page End: 1167
• Publication Date: 2021-05-07
• Subjects: Iron oxides -- Nuclear waste -- Radionuclides -- Selenite ion -- Sorption; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.202000424
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: Sorption processes of metals and semimetals on siderite are studied because of its potential adequacy for removing contaminants from natural waters and its wide availability, as well as its capacity to reduce the oxidation state of some contaminants such as selenium. In this work, it has been demonstrated that siderite reduces selenite ions in solution, showing a higher selenium immobilization capacity compared to other iron(III) minerals, which is probably due to both sorption and reduction processes. Abstract : Immobilization of selenite ion using natural siderite is proposed. This reactive barrier has higher sorption capacity for selenite ions compared to hematite, goethite, and magnetite, which are characterized by incorporating oxyanions. Immobilizing radioactive elements, such as isotope 79 Se(IV), which remain in the nuclear waste, contributes to a safer environment delaying its appearance in the biosphere.