China Three Gorges University

About: China Three Gorges University is a education organization based out in Yichang, China. It is known for research contribution in the topics: Catalysis & Landslide. The organization has 11161 authors who have published 8011 publications receiving 82224 citations. The organization is also known as: Sanxia Daxue.

Robust and efficient photocatalytic hydrogen generation of ReS2/CdS and mechanistic study by on-line mass spectrometry and in situ infrared spectroscopy

Abstract: Photocatalytic hydrogen evolution is an attractive technology to address the increasing energy crisis. The development of advanced photocatalysts presents an attractive but challenging issue. For the first time, we anchored inorganic ReS2 via a facial hydrothermal route as co-catalyst to CdS nanorods for highly efficient H2 evolution. CdS/ReS2 composite photocatalyst containing 1 wt% of ReS2 co-catalyst exhibits the highest photocatalytic H2 evolution rates of 24.36 and 137.5 mmol h−1 g−1 using Na2S-Na2SO3 and lactic acid as sacrificial reagents, respectively, corresponding to 127 and 8.8 fold enhancements, respectively, compared with bare CdS. The photocatalytic enhancement mechanism was elucidated by experimental means and theoretical calculations. The source of hydrogen and the fate of the sacrifice reagents were studied by in situ Fourier transform infrared (FT-IR) spectroscopy and on-line mass spectrometry. Our results showed that ReS2 is a promising co-catalyst to achieve high photocatalytic hydrogen production from water under visible light irradiation.

High Efficiency Dye-Sensitized Solar Cells based on a Bi-Layered Photoanode Made of TiO2 Nanocrystallites and Microspheres with High Thermal Stability

Abstract: Submicrometer-sized monodispersed TiO2 spheres were synthesized by a controlled hydrolysis of titanium tetraisopropoxide (TTIP) and subsequent solvothermal treatment. The X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–visible spectroscopy analyses revealed that aqueous ammonia concentration and calcining temperature significantly influence the morphology, crystallization, dye loading, and light scattering capacity of TiO2 microspheres. And it was found that the TiO2 microspheres prepared by this method showed a good thermal stability of phase. Bilayered dye-sensitized solar cells (DSSCs) composed of TiO2 microspheres as the scattering cover layers and TiO2 nanocrystallines as the underlayer exhibited a remarkable improvement in the power conversion efficiency (8.25%) compared with the nanocrystalline TiO2 DSSC (6.38%), owing to high light scattering efficiency and the dye-loading capacity of the microsphere cover layer. In addition, electrochemical impedance spectra (EIS) and open-cir...

Kaempferol, a flavonoid compound from gynura medica induced apoptosis and growth inhibition in mcf-7 breast cancer cell

Abstract: Background: Kaempferol, a natural flavonoid, has been shown to induce cancer cell apoptosis and cell growth inhibition in several tumors. Previously we have conducted a full investigation on the chemical constituents of Gynura medica, kaempferol and its glycosides are the major constituents of G. medica. Here we investigated the growth inhibition and apoptosis induction effect of kaempferol extracted from G. medica. Materials and Methods: The inhibition effects of kaempferol were evaluated by MTS assay and soft agar colony formation assay. Fluorescence staining and western blotting were be used to study the apoptosis. The structure was identified by 1H- NMR), 13C-NMR and ESI-MS analyses. Results: Our results showed that kaempferol’s inhibition of MCF-7 breast cancer cell growth may through inducing apoptosis and downregulation of Bcl2 expression. Conclusion: Kaempferol is a promising cancer preventive and therapeutic agent for breast cancer.