Anhui Normal University

About: Anhui Normal University is a education organization based out in Wuhu, China. It is known for research contribution in the topics: Catalysis & Population. The organization has 7955 authors who have published 7309 publications receiving 117443 citations.

Fluorescent Zn-PDC/Tb3+ Coordination Polymer Nanostructure: A Candidate for Highly Selective Detections of Cefixime Antibiotic and Acetone in Aqueous System.

Abstract: Tb3+-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb3+, or [Zn(2,5-PDC)(H2O)2]·H2O/Tb3+) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO3)2, Tb(NO3)3, and 2,5-Na2PDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb3+ ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb3+ nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an aqueous system. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV-vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb3+ nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water system.

Large-scale synthesis of hydrated tungsten oxide 3D architectures by a simple chemical solution route and their gas-sensing properties

Abstract: Square slab-like and flower-like hydrated tungsten oxide three-dimensional architectures were synthesized by acidic precipitation of sodium tungstate solution at mild temperature. Techniques of X-ray diffraction, scanning electron microscopy, thermogravimetric-differential thermalgravimetric analysis, and transmission electron microscopy were used to characterize the structure and morphology of the products. The experimental results show that the square slab-like and flower-like WO3·H2O architectures can be obtained by addition of a varying amount of 10.0 M HCl solution. The corresponding tungsten oxide three-dimensional architectures were obtained after calcinations at 400 °C. Finally, the obtained WO3 three-dimensional architectures were used as sensitive materials in the experiments. Compared with WO3 square slabs, the as-prepared WO3 microflowers exhibit a good response and reversibility to some organic gases, such as toluene and acetone. The responses to 100 ppm toluene and acetone are 16.7 and 17.4, respectively, at a working temperature of 320 °C. In addition, the sensors also exhibit a good response to ethanol, methanol and n-butanol, which indicates that the flower-like WO3 nanostructures are highly promising for applications of gas sensors.

Synthesis of one-dimensional WO3–Bi2WO6 heterojunctions with enhanced photocatalytic activity

Abstract: WO3–Bi2WO6 heterostructures were synthesized by a facile hydrothermal method using WO3 nanorods and Bi(NO3)3 solution as raw materials. The Bi2WO6 nanosheets uniformly anchored onto the surface of the WO3 nanorods. The photocatalytic activity of the samples was assessed for degradation of rhodamine B (RhB) and phenol under solar light irradiation. The WO3–Bi2WO6 heterostructures showed higher photocatalytic activities than pure WO3 and Bi2WO6. As the content of Bi2WO6 increased, the photocatalytic activity of the WO3–Bi2WO6 heterojunction was enhanced and the optimal sample was WO3–Bi2WO6 with a nWO3 : nBi3+ mole ratio of 5 : 3. The efficient separation of electron–hole pairs because of the staggered band potentials between WO3 and Bi2WO6 may account for the higher photoactivity of WO3–Bi2WO6 hybrid structures. Radical scavenger experiments indicate that holes (h+) and superoxide radicals (˙O2−) were the main active species for RhB degradation during the photocatalytic process.