Catalyst-Free Extraction of U(VI) in Solution by Tribocatalysis.

Extraction of U(VI) in water is of great significance in energy and environmental fields. However, the traditional methods usually fail due to the indispensable extra addition of catalyst, adsorbent, precipitant, or sacrificial agents, which may lead to enhanced extraction costs and secondary pollution. Here, a new efficient uranium extraction strategy is proposed based on triboelectricity without adding a catalyst or other additives.

Boosted charge transfer in a naturally formed Ca(AlSiO)/FeO heterojunction for piezocatalytical formation of HO and solidification of U(VI).

Energy and environmental issues make the generation of HO and the separation of U(VI) from water very important topics. In this work, we disclosed a low-cost, high-efficiency method for separating U(VI) from water based on the naturally formed catalyst (red volcanic stone powders, RVSP) of Ca(AlSiO)/FeO heterojunction through a piezocatalytic pathway induced by ultrasonication. The charges were found to be elevatedly separated due to the formation of the heterojunction.

Facet-dependent U(VI) removal of hematite with confined ferrous ions.

The presence of ferrous minerals has been demonstrated to have a significant impact on the destiny, migration, and availability of uranyl (U(VI)) in natural surroundings. The iron oxide/Fe(II) system is a multifaceted iron reduction system anchored to surfaces, encompassing various forms of iron and ferrous ions. Several studies have investigated the effectiveness of adsorbed ferrous iron on iron-based minerals to facilitate the reduction of heavy metal ions and radioactive nuclides.

Insights into the highly efficient SPR enhanced photodegradation of tetracycline by Bi/BiMoO composites.

A Bi/BiMoO nanocomposite is fabricated utilizing a simple one-pot solvothermal method, which shows great photodegradation ability to tetracycline (TC). The effect of Bi nanoparticles on the photodegradation of TC was investigated, and it is ascribed to the surface plasmonic resonance (SPR) effect. The light energy could be strongly absorbed by the Bi nanoparticles, and then transferred to the adjacent BiMoO, to enhance the photocatalytic performance.

Insights into Photothermally Enhanced Photocatalytic U(VI) Extraction by a Step-Scheme Heterojunction.

In this work, a CdS/BiVO step-scheme (S-scheme) heterojunction with self-photothermally enhanced photocatalytic effect was synthesized and applied for efficient U(VI) photoextraction. Characterizations such as transient absorption spectroscopy and Tafel test together confirmed the formation of S-scheme heterojunctions, which allows CdS/BiVO to avoid photocorrosion while retaining the strong reducing capacity of CdS and the oxidizing capacity of BiVO. Experimental results such as radical quenching experiments and electron spin resonance show that U(VI) is rapidly oxidized by photoholes/OH to insoluble UO(OH) after being reduced to U(IV) by photoelectrons/O , which precisely avoids the depletion of electron sacrificial agents.

relative self-dependent calibration of electron cyclotron emission imaging via shape matching.

Electron Cyclotron Emission Imaging (ECEI) is a diagnostic system which measures 2-D electron temperature profiles with high spatial-temporal resolution. Usually only the normalized electron temperature fluctuations are utilized to investigate the magnetohydrodynamics modes due to the difficulties of ECEI calibration. In this paper, we developed a self-dependent calibration method for 24 × 16 channel high-resolution ECEI on the Experimental Advanced Superconducting Tokamak.

Re(CO)5Br-catalyzed coupling of epoxides with CO2 affording cyclic carbonates under solvent-free conditions.

In the presence of a catalytic amount of Re(CO)(5)Br, the coupling of epoxides with supercritical CO(2) without an organic solvent at 110 degrees C has afforded cyclic carbonates in good to excellent yields.