Donghua University

About: Donghua University is a education organization based out in Shanghai, China. It is known for research contribution in the topics: Fiber & Nanofiber. The organization has 21155 authors who have published 21841 publications receiving 393091 citations. The organization is also known as: Dōnghuá Dàxué & China Textile University.

A novel 3D Z-scheme heterojunction photocatalyst: Ag6Si2O7 anchored on flower-like Bi2WO6 and its excellent photocatalytic performance for the degradation of toxic pharmaceutical antibiotics

Abstract: The massive consumption and discharge of pharmaceutical antibiotics have driven researchers to explore environment-friendly and effective technology to eliminate them. Herein, a novel flower-like Ag6Si2O7/Bi2WO6 Z-scheme heterojunction photocatalyst with strong redox capability was fabricated via a facile in situ precipitation strategy and then applied to degrade pharmaceutical antibiotics. The as-obtained Ag6Si2O7/Bi2WO6 heterojunction with strong interfacial coupling effects exhibited superior photocatalytic property in comparison with pristine Bi2WO6 and Ag6Si2O7 for the degradation of ciprofloxacin (CIP) and tetracycline hydrochloride (TC) under visible light. The optimized Ag6Si2O7/Bi2WO6 (ASO/BWO-3) showed the maximum photocatalytic performance, and its rate constant for the degradation of CIP was as high as 0.0217 min−1, exceeding that of pristine Bi2WO6 and Ag6Si2O7 by approximately 14.5- and 9.8-fold, respectively. The trapping experiments and ESR analyses revealed that the principal active species responsible for pollutant removal are h+ and ˙O2− species. The PL analysis and EIS measurements further demonstrated that Ag6Si2O7/Bi2WO6 possesses a high separation rate of photogenerated electrons and holes. Its extraordinary photocatalytic performance is ascribed to the synergistic interactions of the Z-scheme hetero-structure and surface plasmon resonance (SPR) effect of the Ag nanoparticles. Remarkably, a separation reaction system was delicately designed and employed to demonstrate the significance of the direct contact between Ag6Si2O7/Bi2WO6 and contaminants for antibiotic degradation. This research may provide a new design concept for constructing highly efficient and stable Z-scheme heterojunction photocatalysts for treating pharmaceutical wastewater.

High entropy carbide ceramics from different starting materials

Abstract: Three typical ceramic processing were respectively used to synthesize (Ti0.2Zr0.2Nb0.2Ta0.2W0.2)C high-entropy carbide (HEC) ceramics by spark plasma sintering. Although single-phase composition characterized by X-ray diffraction were obtained by the three processes, the microstructures and elemental distributions are different. The reasons for the formation of these features are preliminarily discussed. The results demonstrate that the particle sizes of the starting metallic powders was a key factor for obtaining a homogeneous distribution of each elements in the HEC. Carbide process with relatively finer starting carbide powders compared to the above metallic starting powders resulted in an HEC with homogeneous distribution of elements, but the obtained ceramics showed the lowest relative density. For oxide process, it is considered that the obviously higher reaction temperature between ZrO2 and graphite resulted in a two-phase structure of an HEC and a zirconium-rich phase, but the obtained HEC showed the highest relative density.

(a-Diimine)palladium catalyzed ethylene polymerization and ( co )polymerization with polar comonomers

Abstract: In this review, a recent development of cationic a-diimine palladium(II) complexes for ethylene polymerization and copoly-merization with polar functionalized comonomers was briefly described. First, the polymerization mechanism for this type of catalysts was discussed. Next, recent advances in ligand design were provided with special focus on the influence of ligand structures on the catalytic polymerization properties. Last, the ethylene homopolymerization and copolymerization with various polar comonomers, especially acrylate and vinyl ethers were summarized.