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首页> 外文期刊>ACS applied materials & interfaces >Preparation of Boron-Doped Porous Titania Networks Containing Gold Nanoparticles with Enhanced Visible-Light Photocatalytic Activity
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Preparation of Boron-Doped Porous Titania Networks Containing Gold Nanoparticles with Enhanced Visible-Light Photocatalytic Activity

机译：含可见光光催化活性增强的纳米金的掺硼多孔二氧化钛网络的制备

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The ability to decrease the electron/hole recombination rate, and decrease the band gap of titania to allow photoactivity on irradiation with visible light is attracting more and more attention. Here, boron doping of the titania, the deposition of gold nanoparticles, along with a meso-macroporous structure were obtained using a facile agarose gel templating process combined with sol-gel chemistry. The Au/B/TiO2 nanocomposites were characterized using SEM, TEM, XRD, N2 gas sorption, diffuse UV-vis, photoluminescence, and SIMS. The photocatalytic activity was assessed by degradation of an organic probe molecule (methylene blue) under visible light (λ > 420 nm). The resulting materials achieved photocatalytic activities up to 5096 greater than the commercial Degussa P2S under visible light. The enhancement in photocatalytic activity was primarily attributed to the decrease in band gap as a result of the boron doping and its influence on the anatase to rutile phase formation: The doped materials were highly crystalline and an optimum anatase to rutile ratio (3:l) was obtained with 0.25 wt % boronin the sample calcined at 650 C. In addition, the presence of the gold nanoparticles decreased recombination between the photoexcited electrons and holes, which further improved the photocatalytic activity.
机译：降低电子/空穴复合速率并降低二氧化钛的带隙以允许可见光照射下的光活性的能力越来越受到关注。在这里，使用方便的琼脂糖凝胶模板工艺与溶胶-凝胶化学方法相结合，可以获得二氧化钛的硼掺杂，金纳米颗粒的沉积以及介观的巨相结构。使用SEM，TEM，XRD，N2气体吸附，紫外可见光谱，光致发光和SIMS对Au / B / TiO2纳米复合材料进行了表征。通过在可见光（λ> 420 nm）下降解有机探针分子（亚甲基蓝）来评估光催化活性。所得材料在可见光下的光催化活性比市售Degussa P2S高5096倍。光催化活性的增强主要归因于硼掺杂导致的带隙减小及其对锐钛矿到金红石相形成的影响：掺杂的材料是高度结晶的，并且锐钛矿与金红石的最佳比例（3：l）用0.25wt％的硼酸在650℃下煅烧的样品获得了PbO2。另外，金纳米颗粒的存在降低了光激发电子和空穴之间的复合，这进一步提高了光催化活性。

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