Molybdenum-Oxysulfide-Functionalized MgAl-Layered Double Hydroxides─A Sorbent for Selenium Oxoanions.

Effective removal of chemically toxic selenium oxoanions at high-capacity and trace levels from contaminated water remains a challenge in current scientific pursuits. Here, we report the functionalization of the MgAl layered double hydroxide with molybdenum-oxysulfide (MoOS) anion, referred to as LDH-MoOS, and its potential to sequester SeO and SeO from aqueous solution. LDH-MoOS nanosheets were synthesized by an ion exchange method in solution.

Metal-sulfide/polysulfide functionalized layered double hydroxides - recent progress in the removal of heavy metal ions and oxoanionic species from aqueous solutions.

Water constitutes an indispensable resource for global life but remains susceptible to pollution from diverse human activities. To mitigate this issue, researchers are committed to purifying water using a variety of materials to remove harmful chemicals, such as heavy metals. Layered double hydroxides (LDHs), with their intriguing, layered structure and chemical behavior, have attained substantial attention for their effectiveness in removing heavy metal cations and various inorganic oxoanions from water.

Amorphous K-Co-Mo-S Chalcogel: A Synergy of Surface Sorption and Ion-Exchange.

Chalcogel represents a unique class of meso- to macroporous nanomaterials that offer applications in energy and environmental pursuits. Here, the synthesis of an ion-exchangeable amorphous chalcogel using a nominal composition of KCoMoS (KCMS) at room temperature is reported. Synchrotron X-ray pair distribution function (PDF), X-ray absorption near-edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) reveal a plausible local structure of KCMS gel consisting of Mo and Mo clusters in the vicinity of di/polysulfides which are covalently linked by Co ions.

Removal of CrO, a Nonradioactive Surrogate of TcO, Using LDH-MoS Nanosheets.

Removal of chromate (CrO) and pertechnetate (TcO) from the Hanford Low Activity Waste (LAW) is beneficial as it impacts the cost, life cycle, operational complexity of the Waste Treatment and Immobilization Plant (WTP), and integrity of vitrified glass for nuclear waste disposal. Here, we report the application of [MoS] intercalated layer double hydroxides (LDH-MoS) for the removal of CrO as a surrogate for TcO, from ppm to ppb levels from water and a simulated LAW off-gas condensate of Hanford's WTP. LDH-MoS removes CrO from the LAW condensate stream, having a pH of 7.

Kinetically Controlled Reduction of β-Vanadyl(V) Orthophosphate: Synthesis and Characterization of New Metastable Polymorphs of Vanadium(III) Phosphate.

Two thermodynamically metastable polymorphs of vanadium(III) phosphate, VPO-1 and VPO-2, have been obtained via reduction of β-VOPO by moist hydrogen. The XRPD pattern of VPO-1 can be assigned based on the crystal structure of β-VOPO, though with distinctly different lattice parameters (VPO-1/β-VOPO: , = 7.3453(12)/7.