Flower-like AgWO/CeO heterojunctions with oxygen vacancies and expedited charge carrier separation boost the photocatalytic degradation of dyes and drugs.

Charge carrier separation is a very important factor in photocatalysis, and it may be achieved through a variety of paths including the construction of heterojunctions and the formation of surface defects. Herein, we demonstrate the construction of flower-like AgWO/CeO heterojunctions (namely ACs) by deposition of AgWO on the surface of flower-like CeO with oxygen defects. The ACs with 2.

Estimation of Nuclear Medicine Exposure Measures Based on Intelligent Computer Processing.

This paper provides an in-depth discussion and analysis of the estimation of nuclear medicine exposure measurements using computerized intelligent processing. The focus is on the study of energy extraction algorithms to obtain a high energy resolution with the lowest possible ADC sampling rate and thus reduce the amount of data. This paper focuses on the direct pulse peak extraction algorithm, polynomial curve fitting algorithm, double exponential function curve fitting algorithm, and pulse area calculation algorithm.

Metal-Free B, N co-Doped Hierarchical Porous Carbon Electrocatalyst with an Excellent O Reduction Performance.

Fuel cells have attracted increasing attention due to their low cost, high energy density, low environmental pollution, and abundant raw materials. Oxygen reduction reaction (ORR) is a core technology of fuel cells, and the development of new electrocatalysts with high ORR performance is highly desirable. Herein, we synthesize a series of B, N co-doped hierarchical porous carbons using a soft template method with the integration of self-assembly, calcination and etching.

Construction of 2D/2D layered g-CN/BiOCl hybrid material with matched energy band structure and its improved photocatalytic performance.

A series of visible-light-induced 2D/2D layered g-CN/BiOCl composite photocatalysts were successfully synthesized by a one step chemical precipitation method with g-CN, BiCl and NaOH as the precursors at room temperature and characterized through XRD, FTIR, XPS, TEM, BET and UV-vis DRS measurements. The results of XRD, FTIR and XPS indicated that g-CN has been introduced in the BiOCl system. The TEM image demonstrated that there was strong surface-to-surface contact between 2D g-CN layers and BiOCl nanosheets, which contributed to a fast transfer of the interfacial electrons, leading to a high separation rate of photoinduced charge carriers in the g-CN/BiOCl system.

Novel synthesis of magnetic, porous C/ZnFeO photocatalyst with enhanced activity under visible light based on the Fenton-like reaction.

Magnetic visible-light-driven photocatalyst, porous C/ZnFeO (denoted as C/ZFO-CE) was fabricated via a CO-mediated ethanol route. CO-mediated ethanol route largely mitigated the solvent strength and facilitated the homogenous deposition of ZnFeO (ZFO) through the coordination of metallic cation with CO and HCO anions, which were hydrolyzed from CO and HO, thereby avoiding additional precipitant. Moreover, the HCO, CO and NO in the system acted as templates for the formation of porous C avoiding the additional organic mesoporous templates, thus reducing the synthesis cost.

Periodic Mesoporous Organosilica with a Basic Urea-Derived Framework for Enhanced Carbon Dioxide Capture and Conversion Under Mild Conditions.

A periodic mesoporous organosilica with a basic urea-derived framework (PMO-UDF) was prepared and characterized thoroughly. The PMO-UDF showed an enhanced CO capture capacity at low pressure (≤1 atm) and an exceptional catalytic activity in CO coupling reactions with various epoxides to yield the corresponding cyclic carbonates under mild conditions because of the presence of a high surface area, basic pyridine units, and multiple hydrogen-bond donors. The highly stable catalyst could be reused at least six successive times without a significant decrease of the catalytic efficiency or structural deterioration, thus the PMO-UDF composite is considered as a promising material for CO capture and conversion.

Ag2CrO4 nanoparticles loaded on two-dimensional large surface area graphite-like carbon nitride sheets: simple synthesis and excellent photocatalytic performance.

Graphite-like carbon nitride (g-C3N4) with a large surface area was prepared through thermal condensation of guanidine hydrochloride at 650 °C. Various amounts of silver chromate (Ag2CrO4) nanoparticles with small size were highly loaded on the g-C3N4 by a simple co-precipitation method at room temperature. The chemical constituents, surface structure and optical properties of the resultant Ag2CrO4/g-C3N4 composites were thoroughly characterized.

A Simple Method for the Preparation of TiO2 /Ag-AgCl@Polypyrrole Composite and Its Enhanced Visible-Light Photocatalytic Activity.

A novel and facile method was developed to prepare a visible-light driven TiO2 /Ag-AgCl@polypyrrole (PPy) photocatalyst with Ag-AgCl nanoparticles supported on TiO2 nanofibers and covered by a thin PPy shell. During the synthesis, the PPy shell and Ag-AgCl nanoparticles were prepared simultaneously onto TiO2 nanofibers, which simplified the preparation procedure. In addition, because Ag-AgCl aggregates were fabricated via partly etching the Ag nanoparticles, their size was well controlled at the nanoscale, which was beneficial for improvement of the contact surface area.

A Facile and One-Step Synthesis of Visible-Light-Responsive Silver and Mesoporous Carbon Comodified Carbon-Zinc Oxide Composites.

Silver and mesoporous carbon (mC) comodified CZnO composites (Ag/mC/CZnO) were fabricated by a facile, one-step process directly from C, Ag, and Zn precursors in CO -expanded ethanol, which provided a unique medium and did not require additional precipitant and mesoscaled organic templates. When the composite photocatalyst was applied to the degradation of rhodamine B and phenol, Ag/mC/CZnO exhibited excellent photocatalytic activity in visible light. The remarkably improved catalytic activity of the composites was attributed to the following synergistic effects.

Insights into hydrogen bond donor promoted fixation of carbon dioxide with epoxides catalyzed by ionic liquids.

Catalytic coupling of carbon dioxide with epoxides to obtain cyclic carbonates is an important reaction that has been receiving renewed interest. In this contribution, the cycloaddition reaction in the presence of various hydrogen bond donors (HBDs) catalyzed by hydroxyl/carboxyl task-specific ionic liquids (ILs) is studied in detail. It was found that the activity of ILs could be significantly enhanced in the presence of ethylene glycol (EG), and EG/HEBimBr were the most efficient catalysts for the CO2 cycloaddition to propylene oxide.

CO2-assisted synthesis of mesoporous carbon/C-doped ZnO composites for enhanced photocatalytic performance under visible light.

Visible-light-responsive mesoporous carbon/C-doped ZnO (mC/C-ZnO) composites were fabricated using a facile, fast, one-step process in CO2-expanded ethanol solution. It is a green and sustainable process that does not need tedious pretreatment, surfactants or precipitants. CO2 played triple roles in the synthesis of mC/C-ZnO composites; the first was to provide a simple physical expansion to evenly dope the carbon in the ZnO; the second was to offer some chemical groups such as CO3(2-) and HCO3(-), facilitating the uniform and complete deposition through the coordination of a metallic cation with these anions; and the third was to offer CO3(2-) acting as a template for the formation of mesoporosity in the carbon.

Remarkably enhanced photocatalytic activity of ordered mesoporous carbon/g-C₃N₄ composite photocatalysts under visible light.

Ordered mesoporous carbon/g-C3N4 (OMC/g-C3N4) composites with efficient photocatalytic activity under visible light irradiation were prepared by a facile heating method. The as-prepared OMC/g-C3N4 composites were thoroughly characterized by X-ray diffraction, Fourier transform infrared spectroscopy, elemental analyses, transmission electron microscopy with energy dispersion X-ray spectroscopy, N2 adsorption-desorption analysis, UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The photocatalytic activities were evaluated by degrading Rhodamine B dye, and OMC/g-C3N4 composites exhibited much higher photocatalytic activities than pristine g-C3N4.