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采用十二烷基硫醇作为保护剂有效地稳定住了光催化过程中介孔二氧化钛(m-Ti O_2)表面原位生成的Cu~0物种。通过X射线衍射,X射线光电子能谱,高分辨透射电镜,高角环形暗场扫描透射电镜等手段对催化剂的组成结构进行了表征,发现催化剂中仅有Cu~0物种存在。在紫外光照射下,以甲醛水溶液为牺牲试剂测试了Cu~0物种对介孔二氧化钛产氢性能的影响,发现适量的Cu~0纳米颗粒能够极大地提高介孔二氧化钛的产氢性能。当Cu~0的物质的量分数为1.0%时,Cu~0/m-Ti O_2表现出最高的产氢速率,为725μmol·h~(-1)·g~(-1)。该样品中Cu~0纳米颗粒的尺寸为(4.2±0.9)nm。此外,通过气相色谱检测到产生的H_2和CO_2的物质的量之比为2∶1,表明部分氢气来自于水分解。
The dodecyl mercaptan as the protective agent effectively stabilized the Cu 0 species formed on the surface of mesoporous titanium dioxide (m-Ti O 2) during photocatalysis. The composition of the catalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and high-angle circular dark field scanning transmission electron microscopy. It was found that there were only Cu ~ 0 species in the catalyst. The effects of Cu ~ 0 species on the hydrogen production of mesoporous titania were tested under the irradiation of UV light with formalin as the sacrificial reagent. It was found that suitable amount of Cu ~ 0 nanoparticles could greatly enhance the hydrogen production of mesoporous titania. When the content of Cu ~ 0 was 1.0%, Cu ~ 0 / m-Ti O 2 exhibited the highest hydrogen production rate of 725 μmol · h -1 · g -1. The size of Cu ~ 0 nanoparticles in this sample is (4.2 ± 0.9) nm. In addition, the ratio of the amounts of substances producing H 2 and CO 2 detected by gas chromatography was 2: 1, indicating that part of the hydrogen gas came from the water decomposition.