Preparation and use of humic coatings covalently bound to silica gel for Np(V) and Pu(V) sequestration

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

“…This indicates that the presence of organic matter may greatly influence redox as well as complexation speciation of As. Similar reports about humic substances have been published elsewhere (Blinova et al, 2007;Perminova et al, 2007;Zhilin et al, 2004). The presence of amine groups in organic matter play significant role due to their protonation at definite pH values (Saada et al, 2003;Sorkina et al, 2014).…”

Estimation of the Influence of Humic Acid on Radionuclide Binding to Solid Residuals in Deposits of Radioactive Waste

“…However, there are some factors that require more detailed examination, such as the influence of the phase state of HA on the binding of radionuclides, and the formation of HA gel in the water body (Polyakov 2007;Perminova et al 2007). Microscopic examination of samples of suspended matter, sediments, and loam by Bachur et al (2005) hints at binding of radionuclides to SR via a gel structure.…”

“…Microscopic examination of samples of suspended matter, sediments, and loam by Bachur et al (2005) hints at binding of radionuclides to SR via a gel structure. After the first day of exposure, samples of silica gel with irreversibly bound humic substances sequestered by as much as 75% of plutonium at pH values of 7.7 (Perminova et al 2007). As shown experimentally (Bachur et al 2005;Khasanova et al 2006), in the state of MMC, HS can accumulate high amounts of plutonium and uranium isotopes resulting in a transition of these actinides to proper colloidal forms and further coagulation.…”

“…1) show that inorganic colloids, humic substance (HS) and their derivatives play an important role in retardation of radionuclide transport in natural and artificial surface waters (Polyakov 2007;Sapozhnikov et al 2006;Perminova et al 2007). Furthermore, HS polymerize under special conditions.…”

“…This structure causes hydrophobic, and distinct redox, ion exchange, and chelating properties. The enriched fraction of oxygen donor groups within the humic molecule fosters the formation of stable complexes with actinides (Perminova et al 2007). The chemical behavior of HS in the water reservoirs depends on the phase of water ingredients and the concentration of organic matter (OM).…”