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首页> 外文期刊>Applied Surface Science >Photodegradation Of Ch_3i On Mesoporous Tio_2-b Nanofibers With Au Nanoparticles
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Photodegradation Of Ch_3i On Mesoporous Tio_2-b Nanofibers With Au Nanoparticles

机译：金纳米粒子在介孔Tio_2-b纳米纤维上光降解Ch_3i

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Au nanoparticles deposited on mesoporous TiO_2-B nanofibers have been prepared, characterized, and used to catalyze photoreactions of iodomethane. High-density gold-particle deposition on TiO_2-B is obtained by electrostatic and/or chemical force between the particles of TiO_2-B and Au capped with -SC(H)(CO_2H)(CH_2CO_2H) through pH control. The capping groups on the gold particles can be removed after 400 ℃ calcination. It is found that the nature of the inorganic acids used for pH adjustment has effects on particle morphology and deposition. Two other methods, i.e., preparation of TiO_2-B nanofibers in the presence of gold particles and preparation of gold nanoparticles in the presence of TiO_2-B particles (deposition-precipitation method), are also investigated. However, the former method produces a low-density deposition and the latter one induces a morphology change of the TiO_2-B and an increase of the Au in size. Fourier transform infrared spectroscopy has been employed to study and to compare the photoreactions of CH_3I on TiO_2-B and Au/TiO_2-B and the effect of O_2. The presence of gold particles on TiO_2-B increases the efficiency of CH_3I photodegradation, forming adsorbed methoxy and formate. The role of gold is also discussed.
机译：制备，表征并表征了沉积在介孔TiO_2-B纳米纤维上的金纳米颗粒，并用于催化碘甲烷的光反应。 TiO_2-B上的金与金之间的高密度沉积是通过TiO_2-B粒子与被-SC（H）（CO_2H）（CH_2CO_2H）封端的Au之间的静电和/或化学作用力来实现的，方法是通过pH控制。 400℃煅烧后，可以除去金颗粒上的封端基团。发现用于pH调节的无机酸的性质对颗粒形态和沉积有影响。还研究了另外两种方法，即在金颗粒存在下制备TiO_2-B纳米纤维和在TiO_2-B颗粒存在下制备金纳米颗粒（沉积-沉淀法）。然而，前一种方法产生低密度的沉积，而后一种方法引起TiO_2-B的形态变化和Au尺寸的增加。利用傅里叶变换红外光谱技术研究和比较了CH_3I对TiO_2-B和Au / TiO_2-B的光反应以及O_2的作用。 TiO_2-B上金颗粒的存在提高了CH_3I光降解效率，形成了吸附的甲氧基和甲酸酯。还讨论了黄金的作用。

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