Pd catalysts supported on Co3O4 with the specified morphologies in CO and CH4 oxidation

Firstly, the spinel cobalt oxide (Co3O4) was controllably synthesized with different morphologies (cubical, flower-like, plate-like and rectangular-like) via a hydrothermal method. Then Pd was loaded on them by incipient wetness impregnation. The properties of the samples prepared were characterized by XRD, H-2-TPR, CO-TPR, SEM, TEM, HRTEM and XPS. The impacts of Pd addition on CH4 and CO oxidation were investigated under lean methane and CO atmosphere, respectively. The effectiveness of Pd was different for CH4 and CO oxidation. For methane oxidation, the activities of Co3O4 were enhanced due to Pd loading. And the orders of activity primarily kept consistent before and after impregnation, while the extent of improvement on activity from Co3O4 to Pd/Co3O4 was consistent with the order of surface O-ads/O-lat of Pd/Co3O4, indicating that different interaction occurred between Pd species unit cell and the Co3O4 unit cell with different crystal planes

Research Progress in Ordered Nanomaterials via Magnetic Field Induced Preparation

Ordered nanomaterials are widely concerned for their excellent performance in mechanics, electricity, optics and magnetism. Magnetic field induced self-assembly is widely used for the preparation of ordered nanomaterials, which has the advantages of indirect contact with the reaction system, controllable adjustment of magnetic field. By using this preparation method, it can realize the alignment of nanomaterials without affecting the comprehensive performance of each component in the system. In this paper, we reviewed magnetic field induced self-assembly of metal nanomaterials, oxide nanomaterials and nanocomposites. We also looked forward to the future research direction

Activation of MAT2A-RIP1 signaling axis reprograms monocytes in gastric cancer

Background The activation of tumor-associated macrophages (TAMs) facilitates the progression of gastric cancer (GC). Cell metabolism reprogramming has been shown to play a vital role in the polarization of TAMs. However, the role of methionine metabolism in function of TAMs remains to be explored.Methods Monocytes/macrophages were isolated from peripheral blood, tumor tissues or normal tissues from healthy donors or patients with GC. The role of methionine metabolism in the activation of TAMs was evaluated with both in vivo analyses and in vitro experiments. Pharmacological inhibition of the methionine cycle and modulation of key metabolic genes was employed, where molecular and biological analyses were performed.Results TAMs have increased methionine cycle activity that are mainly attributed to elevated methionine adenosyltransferase II alpha (MAT2A) levels. MAT2A modulates the activation and maintenance of the phenotype of TAMs and mediates the upregulation of RIP1 by increasing the histone H3K4 methylation (H3K4me3) at its promoter regions.Conclusions Our data cast light on a novel mechanism by which methionine metabolism regulates the anti-inflammatory functions of monocytes in GC. MAT2A might be a potential therapeutic target for cancer cells as well as TAMs in GC

Visible-light-driven Ag/AgCl@In2O3: a ternary photocatalyst for the degradation of tetracycline antibiotics

The abuse of tetracycline antibiotics (TCs) has created great threats to both human health and the ecosystem. Therefore, developing efficient technologies to remediate these contaminants is of significant and practical interest. In this work, a ternary plasmonic Ag/AgCl@In2O3 nanocomposite was synthesized by growing AgCl on the surface of one-dimensional In2O3 nanorods, followed by the in situ photoreduction of Ag from AgCl on AgCl@In2O3. The as-synthesized Ag/AgCl@In2O3 nanocomposite exhibits excellent performance for the photocatalytic degradation of tetracycline (TTC) with a degradation rate constant of 0.166 min(-1), which is much better than that of pristine In2O3, Ag@In2O3, AgCl@In2O3, Ag/AgCl, and In2O3 + Ag/AgCl (the mechanical mixture of In2O3 and Ag/AgCl) samples. Five photocatalytic cycling tests demonstrate that Ag/AgCl@In2O3 possesses outstanding stability. In addition, Ag/AgCl@In2O3 also exhibits excellent photo-activity for the degradation of other types of tetracycline antibiotics, e.g. chlortetracycline (CTC) and oxytetracycline (OTC). Further trapping experiments prove that h(+) and O-2(-) are responsible for the photocatalytic reactions. The enhancement in the photoactivity of the Ag/AgCl@In2O3 system is largely due to the surface plasmon resonance effect (SPR) provided by the Ag nanoparticles, which inject electrons into AgCl and/or In2O3, and the efficient separation of photoinduced carriers is possible by transferring electrons to the conduction band of In2O3. This work provides a new type of photocatalyst towards the effective treatment of tetracycline antibiotics in aqueous systems

In Situ Hydrothermal Construction of Direct Solid-State Nano-Z-Scheme BiVO₄/Pyridine-Doped g‑C₃N₄ Photocatalyst with Efficient Visible-Light-Induced Photocatalytic Degradation of Phenol and Dyes

In the current study, a mediator-free solid-state BiVO₄/pyridine-doped g-C₃N₄ nano-Z-scheme photocatalytic system (BDCN) with superior visible-light absorption and optimized photocatalytic activity was constructed via an in situ hydrothermal method for the first time. The pyridine-doped g-C₃N₄ (DCN) nanosheets show strong absorbance in the visible-light region by pyridine doping, and the BiVO₄ (∼10 nm) nanoparticles are successfully in situ grown on the surface of DCN nanosheets by the controlled hydrothermal method. Under the irradiation of visible light (λ > 420 nm), the BiVO₄/DCN nanocomposite photocatalysts efficiently degrade phenol and methyl orange (MO) and display much higher photocatalytic activity than the individual DCN, bulk BiVO₄, or the simple physical mixture of DCN and BiVO₄. The greatly improved photocatalytic ability is attributed to the construction of the direct Z-scheme system in the BiVO₄/DCN nanocomposite free from any mediator, which leads to enhanced separation of photogenerated electron–hole pairs, as confirmed by the photocurrent analysis. The possible Z-scheme mechanism of the BiVO₄/DCN nanocomposite photocatalyst was investigated by transient time-resolved luminescence decay spectrum, active species trapping experiments, electron paramagnetic resonance (EPR) technology, and hydrogen evolution test

Synergistic Effects of Ag Nanoparticles/BiV1-xMoxO4 with Enhanced Photocatalytic Activity

Abstract In recent years, BiVO4 has drawn much attention as a novel photocatalyst given its excellent ability to absorb visible light. This work reports the development of Ag-modified BiV1-xMoxO4 composites through a facile hydrothermal synthesis with the subsequent photoinduced reduction of Ag+ at almost neutral pH conditions. Metallic Ag nanoparticles were deposited on the (040) facet of Mo-doped BiVO4 powders. The crystal structure and morphology of the as-prepared samples were studied by XRD and SEM analyses. Moreover, the photocatalytic performance of BiVO4, Ag/BiVO4, and Ag-modified BiV1-xMoxO4 were evaluated by the degradation of rhodamine B (RhB). The Ag/BiV0.9925Mo0.0075O4 composite exhibited the most efficient photocatalytic performance. The present work provides greater insight into the application of BiVO4 in the field of photocatalysis

Constructing a Protective Pillaring Layer by Incorporating Gradient Mn4+to Stabilize the Surface/Interfacial Structure of LiNi0.815Co0.15Al0.035O2 Cathode

Nickel-rich layered oxides are regarded as very promising materials as cathodes for lithium-ion batteries because of their environmental benignancy, low cost, and high energy density. However, insufficient cycle performance and poor thermotic characteristics induced by structural degradation at high potentials and elevated temperatures pose challenging hurdles for nickel-rich cathodes. Here, a protective pillaring layer, in which partial Ni2+ ions occupy Li slabs induced by gradient Mn4+, is integrated into the primary particle of LiNi0.815Co0.15Al0.035O2 to stabilize the surface/ interfacial structure. With the stable outer surface provided by the enriched Mn4+ gradient concentration and the pillar effect of the NiO-like phase, Mn-incorporated quaternary cathodes show enhanced structural stability and improved Li+ diffusion as well as lithium-storage properties. Compared with the severe capacity fade of a pure layered structure, the cathode with gradient Mn4+ exhibits more stable cycling behavior with a capacity retention of 80.0% after 500 cycles at 5.0 C

Synthesis of barbituric acid doped carbon nitride for efficient solar-driven photocatalytic degradation of aniline

A series of barbituric acid doped carbon nitride (CN-BA) photocatalysts were successfully prepared by copolymerizing dicyandiamide with barbituric acid (BA). Under AM1.5 simulated sunlight, CN-BA photocatalysts exhibit enhanced photocatalytic activity compared to pure carbon nitride for the degradation of aniline. The highest activity is obtained with 2% doped CN-BA photocatalyst. Results: on the photodegradation of aniline indicate that for the optimized CN-BA photocatalyst, the concentration of aniline solution was reduced gradually from 16 mg/L to 1.354 mg/L in 2 h. This corresponds to a 6 times higher photodegradation efficiency than pure carbon nitride samples. The enhanced photocatalytic activity of CN-BA relies on the enhanced surface area, the higher light absorption and the reduced recombination of the photo-generated electron-hole pairs. This interpretation results from multiple characterizations with EPR, BET, N-2 adsorption, Solid-state C-13 NMR, UV-vis DRS, FESEM, and TEM. Under simulated sunlight irradiation, CN-BA is excited and generates electron-hole pairs. The photo generated electrons in the CN-BA conduction band react with the molecular oxygen to form O-center dot(2)-. Part of the O-center dot(2)- transforms into (OH)-O-center dot, which further oxides aniline. Meanwhile, photo-generated holes in the valence band of CN-BA can benefit to the formation of (OH)-O-center dot or directly oxide aniline. (C) 2017 Published by Elsevier B.V