Adsorption of uranium from aqueous solution by PAMAM dendron functionalized styrene divinylbenzene

Synthesis of Fe3O4@TiO2 core–shell magnetic composites for highly efficient sorption of uranium (VI)

“…One possible explanation to this positive enthalpy change is that uranium (VI) ions dissolve well in water and have to be denuded of their hydration sheaths to some extent before sorption on Fe 3 O 4 @TiO 2 , and the endothermicity of the desolvation process overwhelms the exothermicity of uranium (VI) ions attachment to the surface of Fe 3 O 4 @TiO 2 ; The positive value of S • showed that an increase in the randomness at the solid-solution interface during the adsorption process [43]. Randomness arises owing to the destruction of hydration shell of uranium ions favored the adsorption on the surface of the adsorbent [44]. The negative values of the G • confirm that the uranium (VI) adsorption on the Fe 3 O 4 @TiO 2 composite is a spontaneous process.…”

Phosphorous‐Based Pillar[5]arenes for Uranyl Extraction

“…The importance of uranium element has been demonstrated by the extensive research in nuclear industry. [12] As the most abundant actinide element in most chemical separation processes, uranium is taken as paramount important as nuclear fuel in a long run owing to its power in producing electrical energy for centuries without the threat of global warming. [13] Enrichment of uranium from sea water represents a subject that triggers off tremendous academic interest considering the increasing concerns associated with depletion of terrestrial resources.…”

CHAPTER 2. Activated Carbon from Biomass for Water Treatment

“…The average uranium concentration in earth crust is about 3 mg kg À1 . [233][234][235] Uranium is mainly used as fuel for the generation of electricity in nuclear reactors as well as a catalyst and high temperature ceramic. 236 Excessive releases of uranium into the environment are associated with activities of the nuclear fuel cycle as well as a current mining operations 233,235 and processing.…”

“…Adsorption has been proven to be an effective and convenient process for this purpose because of its cost-effective treatment and easy operation. 234 Various types of adsorbents such as biosorbent, organic and inorganic sorbents and carbonbased materials have been developed for uranium recovery. 234 In aqueous solutions, uranium can be present in both tetravalent and hexavalent stable forms, uranous U 1 and uranyl UO 2 21 ions.…”

“…234 Various types of adsorbents such as biosorbent, organic and inorganic sorbents and carbonbased materials have been developed for uranium recovery. 234 In aqueous solutions, uranium can be present in both tetravalent and hexavalent stable forms, uranous U 1 and uranyl UO 2 21 ions. 240 For adsorption studies, uranyl nitrate hexahydrate is always used to prepare the uranium-containing solution, meaning that the UO 2 21 ion constitutes the main adsorbate.…”