本研究重點是光觸媒裂解海水產氫，為促進奈米TiO2（nanotubes）的活性基，添加2.5~5.0%氧化銅（CuO）於TiO2表面。從X-ray absorption near edge structure (XANES)圖譜分析發現，TiO2表面之氧化銅（CuO/奈米TiO2）以分子簇(clusters)為主。CuO/TNT光催化裂解海水的效率分別為TNT及奈米TiO2之2.84及64倍。2.5% CuO/奈米TiO2¬之光催化裂解海水比奈米TiO2高7.8倍。

值得注意的是在10 ppm的亞甲基藍（MB）時，2.5% CuO/奈米TiO2對光催化裂解水與海水之活性也很高，在5小時的紫外光-可見光（UV-Vis）照射下，水中86%的MB可被光催化降解，而且產氫效率可達 25 µmol/g 觸媒；海水中 MB的降解效率則可達99%，但產氫效率僅15.7 µmol/g 觸媒。

The main objective of this study was to prepare effective photocatalysts for splitting of seawater to yield H2. To enhance activity of the nanosize and nanotube TiO2, 2.5-5.0% of CuO was supported on TiO2. By X-ray absorption near edge structure (XANES) spectroscopy, it seems that CuO clusters are supported on nanosize TiO2 (CuO/nano TiO2) which can photocatalyze splitting of water and seawater. The average effectiveness of the 5%CuO/TNT for photocatalytic splitting of water is greater than those of TNT and nanosize TiO2 by 2.84 and 64 times, respectively. The photocatalyst (2.5%CuO/nano TiO2) has greater activities in photocatalytic splitting of water and seawater than nanosize TiO2 by 9.9 and 7.8 times, respectively.

Interestingly, the 2.5%CuO/nano TiO2 photocatalyst is also very active for photocatalytic splitting of water and seawater in the presence of methylene blue (MB) (10 ppm). It is found that 86% of MB in water can be degraded photocatalytically in a five-hour irradiation of the UV-Vis light, whereas H2 generation is 25 µmol/g cat. About 99% of MB can be degraded in seawater. The H2 generation is 15.7 µmol/g cat.

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