Separation of Uranium from Aqueous Solutions Using Al³⁺‐ and Fe³⁺‐modified Titanium‐ and Zirconium Phosphates

Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

“…Further research allowed synthesis of ion exchangers such as a granulated gels, which favorably differ from powders [24][25][26]. Recent studies have allowed increasing the porosity, the selectivity of adsorption and the exchange capacity of such gels to radionuclides and other cationic and anionic contaminants [27][28][29][30][31][32]. Adsorption of heavy radionuclide ions which have a complex-forming ability-uranium, plutonium, americium, lanthanides, cobalt, etc.-can be carried out onto the above-mentioned adsorbents, apatites, and onto the metal-substituted forms of silica gel [33][34][35][36][37][38].…”

Newly recognized hosts for uranium in the Hanford Site vadose zone

“…Extensive laboratory experiments have been conducted on the uptake of U from aqueous solutions by crystalline and amorphous Zr-(oxyhydr)oxides and Zr-phosphates (e.g., Amphlett, 1964;Gal and Ruvarac, 1964;Horwitz, 1966;Vesely et al, 1968;Ruvarac and Vesely, 1970;Marei et al, 1972;Aly et al, 1975;Pakholkov and Zelenin, 1988;Song et al, 1995;Plotnikov and Bannykh, 1997;Drot et al, 1999;Zhuravlev et al, 2002;Lomenech et al, 2003;Misaelides et al, 2006;Um et al, 2007;Finck et al, 2008). Early studies focused on the use of these materials as industrial ion exchangers, while more recent ones were designed to test their applicability to the remediation or prevention of U contamination in soils and natural waters.…”

Extraction of metals from aqueous systems employing capillary-channeled polymer (C-CP) fibers modified with poly(acrylic acid) (PAA)

“…silica) to non-conventional materials as unique as human hair and bone powder. 9 Recent research efforts have focused towards inorganic sol-gels, [12][13][14] polyurethane foams, 15 polymer sorbents 4,6,16 and functionalized silica resins 17,18 to provide high binding capacity and/or metal-specific sorbents. Relevant to the work described here, both polymer and silicabased fibers have also been used as SPE media for a variety of analyte species.…”