The rotating packed bed is a new and effective mass transfer equipment. However, because of the complexity fluid flow inside the RPB, the flow experiment are not easy to lead to the deeper understanding on the fluid dynamic in an RPB. To explore the internal flow field distribution of rotating packed bed , the internal flow field in counter-current double packing rotating packed bed was studied. At the same time, the flow field changes in different rotating speed was compared and the liquid distribution between the two layer of packing was performanced.
Rotating packed bed is a new high efficient equipment for multiphase flow transference, it has been widely used in chemical separation and preparation of nano-materials. The gas pressure drop of RPB is one of important indicators which are used to measure performance of RPB. In this paper, the experimental and simulative progress of research on the gas pressure drop at home and abroad in recent years is reviewed. All kinds of gas pressure drop experiments and simulations of counter-flow RPB, cross-flow RPB are introduced and compared, followed with the analysis of the progress, existing problems, the trend and emphasis.
The Cd0.3In2S4-Zn0.7In2S4 composite photocatalyst doped with transition metal Cu2+ has been synthesized by hydrothermal method. The physical and photophysical properties of the above-prepared photocatalysts were characterized by XRD, UV-Vis, SPS, SEM and XPS. The XRD peaks of Cu2+ doped Cd0.3In2S4-Zn0.7In2S4 were almost the same as the crystal structure of Cd0.3In2S4-Zn0.7In2S4. The UV-Vis absorption edge of Cu2+ doped Cd0.3In2S4-Zn0.7In2S4 shifted monotonically to long wavelength. The photocatalytic activity of Cu2+ doped photocatalysts had been improved as a result of the enhancement of the charge separation efficiency. The results indicated that the photocatalyst of Cu2+(2wt %)-Cd0.3In2S4/Zn0.7In2S4 exhibited the highest photocatalytic activity with the rate of H2 evolution to be 1141 μmol/(h·g) under visible light irradiation.
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