The interactions between uranium(VI) and phosphate are known to be critical in governing the mobility of uranium(VI). However, only using phosphate compounds to remove uranium(VI) in aqueous solution is often unsatisfactory owning to insufficient active sites on their surface. The enhancement of...

An immobilization approach for the fabrication of activated sludge-graphene oxide composites (AS-GO) was proposed in this work in order to make full use of the adsorption feature of activated sludge and graphene oxide. The influence of solution pH, reaction time and uranium concentration on uran...

A novel adsorbent, metal organic framework (MIL-68) decorated graphene oxide (MIL-68/GO) composites were prepared in this study. The synthesized sorbent was well-characterized by Transmission Electron Microscope (TEM), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR), w...

There is a need to develop highly efficient materials for capturing uranium from nuclear wastewater. Here, 5-methylbenzotriazole modified graphene oxide (MBTA-GO) was used to adsorb U(VI) from aqueous solution. By the trials of different conditions, we found that the removal of U(VI) from acidic...

In the present work, we reported the preparation of a highly porous phosphate-functionalized graphene (HGP) hydrogel electrode material by a two-step process for uranium (U(VI)) electrosorption. The extra pores were pre-created on graphene nanosheets by a simple H2O2 etching reaction, and then t...

In this research, the Fe–Ni/graphene oxide composite (Fe–Ni/GO) was synthesized by the hydrothermal way and investigated to remove uranium(VI) from aqueous solution under various environmental conditions. Loading Fe–Ni on GO could obviously enhance the stability of Fe–Ni/GO. X-ray diffractom...

Uranium extraction from seawater is of significant importance for the sustainable utilization of uranium in the near future; however, several challenges remain owing to the low uranium concentration and high salinity of seawater. In this work, for the first time, photocatalysis by TiO2 was intro...

The effect of α-isosaccharinic acid (ISA) on the solubility and redox of tetravalent and hexavalent uranium (U(IV), U(VI)) was investigated in the hydrogen ion concentration (pHc = −log [H+]) range of 6–13 and at total ISA concentration ([ISA]tot) = 10−4–10−1.2 mol/dm3 (M). The dependence of ...

Biological uranium (VI) reduction was investigated using a mixed-culture of U(VI) reducing bacteria isolated from tailing dumps at an abandoned uranium mine in Pharaborwa (Limpopo Province, South Africa). A fixed-film reactor was used in the investigation, whereby the reactor was operated in the...

The introduction of organic groups onto graphene oxide (GO) platelets can supply additional active sites for adsorption of uranium(VI) (U(VI)) to improve the adsorption capacity. However, as a result of the existence of stabilizing π-conjugation system, a facile and effective modification metho...

The enthalpies of formation from simpler components of four hybrid materials bearing the [UO2Cl4]2− anion have been measured and compared to that of Cs2[(UO2)Cl4]. The hybrids contain protonated amines as charge balancing cations that form bifurcated H-bonding interactions with the chloro ligand...

The release of uranyl from uranium tailing sites is a widely concerned environmental issue, with limited investigations on the effect of coexistence of various colloids. Gibbsite colloids extensively exist, together with ubiquitous humic substances, in uranium polluted waters at tailing sites, d...

Environmental conditions in deep geological repositories for radioactive waste may involve high pH values due to the degradation of concrete. However, the U(VI) sorption at such (hyper)alkaline conditions is still poorly understood. In this study, batch sorption experiments with Ca-bentonite in ...

Engineered barrier systems designed to isolate high-level radioactive waste utilize bentonite, a montmorillonite-rich material, to restrict contaminant transport due to its low hydraulic conductivity and high adsorption capacity. High temperatures (100–200 °C) near waste canisters resulting fr...

The coordinating ability of the dicyanamide (DCA−) anion has been exploited for dissolving the uranyl nitrate in ionic liquid medium composed of 1-butyl-3-methylimidazolium dicyanamide (C4mImDCA) and N-butyl-N-methylpyrrolidinium dicyanamide (C4mPyDCA). The DCA− anion can act as either monodenta...

Two novel uranyl glutarate coordination polymers were characterized by single crystal X-ray diffraction and IR spectroscopy. The structure of the first compound with [N(CH3)3(CH2C6H5)]2[(UO2)2(C5H6O4)3]·H2O (1) composition (where C5H6O42− = C3H6(COO−)2 = glt2− are glutarate anions) contains [(U...

The speciation of U in NaCl-bearing solutions at temperatures up to 250 °C and concentrations of NaCl up to 1.5 m has been investigated using an in situ spectroscopic technique. The recorded spectra permit us to identify the species present in the solutions as UO22+, UO2Cl+, and UO2Cl2°. UO2Cl...

Charge-transfer (CT) is an important enhancement mechanism in the field of surface-enhanced Raman scattering (SERS) that typically increases the Raman intensity of molecules by as much as 10–100 times. Herein, a low-cost Ag2O aggregates substrate was prepared via a facile chemical precipitation...

Polyol mediated synthesis for the preparation of tungsten trioxide and titanium doped tungsten trioxide has been reported. The reaction was carried out using chlorides of tungsten and titanium in diethylene glycol medium and water as the reagent for hydrolysis at 190 °C. Formation of a blue col...

The oxides of the transition metal molybdenum exhibit excellent antimicrobial properties. We present the preparation of molybdenum trioxide dihydrate (MoO3 × 2H2O) by an acidification method and demonstrate the thermal phase development and morphological evolution during and after calcination f...