The adsorption mechanism of uranium(VI) from seawater on a macroporous fibrous polymeric adsorbent containing amidoxime chelating functional group

Recent International R&D Activities in the Extraction of Uranium from Seawater

“…Both laboratory studies and marine experiments in the Pacific Ocean have been conducted. The laboratory studies cover the preparation of amidoxime-based adsorbents, the equilibrium of the uranium uptake, and the kinetics and mechanism of the extraction of uranium from seawater (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). Collection of uranium with chitosan-resin and biomass such as algae was also performed (17,18).…”

Synthesis of a Novel Chelating Resin for the Separation and Preconcentration of Uranium(VI) and Its Spectrophotometric Determination

“…On the other hand, an isomeric change of the amidoxime chelating functional group in different acidic solutions is an important impact factor on the adsorption of U(VI) on the resin. 20 …”

“…[15][16][17][18][19] The choice of the ligand introduced into the resin plays an important role in achieving selectivity. In the literature, a variety of chelating resins including amidoxime groups (-C(=NOH)NH2), 1,20 azo groups (-N=N-) 21 and carboxylic acid groups (-COOH) 22 have been synthesized and used for the separation/preconcentration of uranium(VI) ions. It is well known that resins or adsorbents containing amidoxime groups as a functional group adsorb U(VI) species in seawater.…”

The adsorptive potential of chicken egg shells for the removal of oxalic acid from wastewater

“…Adsorption has been found to be superior to other techniques in terms of low-cost, flexibility and simplicity of design, ease of operation and insensitivity to toxic pollutants [9] . In adsorption, different adsorbents used include activated carbon [10] , zeolite [11] , clays [12] , silica beads [13] , and polymeric acids [14] etc. However, due to high cost, these materials cannot be justified to cope with pollution and therefore, research has been directed towards methods of treatment using locally available low-cost natural materials such as biopolymers [10] .…”