| Summary: | 碩士 === 國立東華大學 === 光電工程學系 === 102 === Owing to be provided with broader energy gap (3.37 eV), binding energy (60 meV) and greater photocatalytic activity, zinc oxide is widely applied to photoelectric element related works, the study is to fabricate porous zinc oxide photocatalyst bearing carbon fiber composite material under condition of ultrasonic assisted electrochemical in room temperature, and explore its antibacterial ability and conduct photocatalysis hydrogen generation experiment in self-made biofuel. In part 1, the study mainly adopts two different kinds of precursors of zinc acetate and zinc nitrate under ultrasonic assisted to conduct electrochemical deposition on ZnO photocatalyst materials on carbon fiber surface, attempts to find optimal auxiliary parameters in the process. On basis of XRD analysis, it is identified that the fabricated porous ZnO is provided with stronger diffraction peak as experimental parameter is under condition of 28 kHz, with positions of 32.8 and 34.4 degree in 2 angle, and relative crystal planes are 100 and 002 respectively. In cycling voltammetry analysis, it is found that the porous ZnO fabricated with zinc nitrate as precursor is provided with preferred oxidized electric current, where the maximum oxidized electric current can reach 79.5A under xenon lamp irradiation. In part 2, the study adopts the porous ZnO nano photocatalyst materials that fabricated with optimized parameter in part 1, to conduct experiment of photocatalysis escherichia coli antibacterial. As shown in the experiment results, the efficacy of escherichia coli antibacterial is provided with optimal escherichia coli antibacterial curve in first test, but, in second duplicated test, the antibacterial effect reduced to halve, further, in third test, the antibacterial effect is loss, and it is found in electron microscope images that the reason resulted in antibacterial curve uprising lies in ZnO stripping from carbon fiber substrate. In part 3, the study similarly adopts the porous ZnO nano photocatalyst materials that fabricated with optimized parameter in part 1, to conduct experiment of photocatalysis hydrogen generation. Firstly, it is found in the self-made biomass ethanol study, the self-made biomass ethanol fermenting concentration is affected by irradiated light source of various wavelength in the fermenting process, especially under dark condition, the biomass ethanol fabricated after one purification is able to reach concentration of 50 % above, relatively the concentration of biomass ethanol with red light assisted fermenting reaches only 40 %. And then, the fabricated 52 % biomass ethanol is used as sacrifice reagent to conduct photo-decomposition hydrogen generation experiment, and the hydrogen generation efficiency is about 301 mol hr-1.
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