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Nanoscale Fe(0)-zeolite composite derived from coal bottom ash for efficient treatment of Cr(VI)-contaminated groundwater: Unveiling the importance of locations for surface-bound Fe(II) and Fe(0) passivation products.
J Hazard Mater
January 2025
Department of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea; Department of Environmental Engineering, Graduate School, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea. Electronic address:
The synthesis of coal bottom ash-induced zeolite (Si-Al material) has been widely reported; however, the selective recovery of the three main elements, viz., Si, Al, and Fe, from coal bottom ash for the synthesis of reactive adsorbents has not yet been reported. In this study, we separated the magnetic and non-magnetic fractions of coal bottom ash to selectively recover Fe and Si-Al for synthesizing nanoscale zero-valent iron@zeolite (NZVI@ZBA) composites with uniform formation of Fe(0) nanoparticles on the ZBA surface.
View Article and Find Full Text PDFSynthesis of shape-tunable PbZrTiO nanocrystals with lattice variations for piezoelectric energy harvesting and human motion detection.
Chem Sci
January 2025
Department of Chemistry, National Tsing Hua University Hsinchu 300044 Taiwan
PbZrTiO cubes with tunable sizes and cuboids have been hydrothermally synthesized. PbZrTiO cubes with three different Zr : Ti atomic percentages were also prepared. Analysis of synchrotron X-ray diffraction (XRD) patterns reveals the presence of two lattice components for these samples.
View Article and Find Full Text PDFGCTransNet: 3D mitochondrial instance segmentation based on Global Context Vision Transformers.
J Struct Biol
January 2025
Shenzhen Bay Laboratory, Shenzhen 518132, China; Lingang Laboratory, Shanghai 200032, China. Electronic address:
Mitochondria are double membrane-bound organelles essential for generating energy in eukaryotic cells. Mitochondria can be readily visualized in 3D using Volume Electron Microscopy (vEM), and accurate image segmentation is vital for quantitative analysis of mitochondrial morphology and function. To address the challenge of segmenting small mitochondrial compartments in vEM images, we propose an automated mitochondrial segmentation method called GCTransNet.
View Article and Find Full Text PDFThe Cu site in particulate methane monooxygenase may be used to produce hydrogen peroxide.
Dalton Trans
January 2025
Department of Computational Chemistry, Lund University, Chemical Centre, P. O. Box 124, SE-221 00 Lund, Sweden.
Particulate methane monooxygenase (pMMO) is the most efficient of the two groups of enzymes that can hydroxylate methane. The enzyme is membrane bound and therefore hard to study experimentally. For that reason, there is still no consensus regarding the location and nature of the active site.
View Article and Find Full Text PDFCharacterization of an Unexpected μ Adsorption of Molecular Oxygen on Ag(100) with Low-Temperature STM.
J Phys Chem C Nanomater Interfaces
January 2025
Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, South Korea.
Precise description of the interaction between molecular oxygen and metal surfaces is one of the most challenging topics in quantum chemistry. In this work, we use low-temperature scanning tunneling microscopy (STM) to identify and characterize an adsorption state of molecular oxygen that coordinates to three Ag atoms (μ) on Ag(100). Surprisingly, μ-O cannot be identified as a stable configuration with generalized gradient approximation (GGA)-level density functional theory (DFT) calculations.
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