查询词典 photoactivity

So anatase titanium oxide can separate electrum and cavity more effectively. At the same time, anatase has better photoactivity than rutile. Therefore it is significant to research how to prepare stable anatase titanium oxide film. On the other hand, titanium oxide absorbs ultraviolet light strongly (absorption edge is at 380nm) but visible light weakly.

在光催化方面TiO_2的激发必须在高能量的紫外光下才能进行，而到达地面的太阳能中只有3-4%的紫外光，人工紫外光又价格昂贵，所以将光激发红移到可见光区，可降低成本、节省能源。

The prepared powders were characterized by XRD, UV-Vis, FTIR, N_2 adsorption, Fluorescence spectroscopy, etc. N-doped TiO_2 evidently shows its absorbance shoulder shift into visible light region. Moreover, N-doping retards the transition of TiO_2 from anatase to rutile type as well as restrains the growth of the crystal size which leads to less decrease of surface area. These characteristics are considered to benefit the photoactivity of TiO_2; When all the samples were applied to the photodecomposition of Methylene Blue under visible light(λ＞400 nm), the N-doped TiO_2 show an obvious superiority when compared to the undoped TiO_2, the active hydroxyl groups are found to play a important role in this high photoactivity; When the same experiment was performed under UV light, all the samples show the consistent sequence of photoactivity as in the visible light.

通过UV-Vis、XRD、BET、IR、FL等表征手段测试表明：掺氮不仅使TiO_2的光吸收区域拓展到可见光区，而且有利于延缓TiO_2晶相的转换，从而抑止了高温煅烧下所引起的晶粒增大以及比表面积的降低，且氮源浓度越高，此现象越明显，这些特征都有利于催化剂光催化活性的提高；在主波长大于400nm的可见光催化亚甲基蓝实验当中，掺氮TiO_2的光催化活性明显优越于未掺氮样品，亚甲基蓝在90min内达到88％的脱色率。

In this paper, La-doped TiO_2 photocatalysts were synthesized via an improved hydrothermal synthetic route without calcination step, and were characterized by XRD, UV-Vis, IR and BET. The effect of ratio of water to alcohol, dopant content and reaction temperature on TiO_2 crystalline phase, crystallinity, and photoactivity for degradation of Rh B were discussed in detail.

从制备的角度来说，避免高温煅烧过程来制备小粒径、高比表面积、高结晶度、高光催化活性的二氧化钛，同时使用更加价廉易得的原料，尽可能地简化反应步骤，成为一个很有意义的研究方向。

However, the research of their photoactivity and photodegradation is not systemic and adequate.

同时，文献对光敏化合物的活性测试的方法和结论也千差万别。

Lewis acidity is considered to be responsible for the high photoactivity at 950 °C.

而路易士酸被认为是锻烧950 ℃之样品有高活性的主要原因。

In order to improve photoactivity for further application, investigations about how to extend its light absorbance into visible light region have become a focus.

在众多通过改性手段改善催化剂活性的领域中，拓宽对光的吸收范围从而提高其光催化效率成为现在研究的重要环节。

The effects of preparing conditions such as calcination temperature on the physical characteristics and the photoactivity were investigated.

纳米TiO_2／粘土复合光催化剂是将TiO_2固定在粘土矿物的表面形成纳米薄层或分散均匀的TiO_2纳米晶体。

The results show photoactivity is related to structure of TiO2, that is the anatase phase plays beneficial role in photoactivity.

结果表明，光催化活性与晶体结构有关，锐钛矿型有利于光催化活性的提高。

The lower oxidising power and reducing power of the of the available electrons and holes once transferred to the iron oxide phase, as suggested by Litter and Navio [9], can also be translated into lower photoactivity.

比较低的使氧化力量而且减少力量那可得的电子和洞一次转移到氧化铁状态，当做建议被垃圾和 Navio[9]，也能被转变为比较低的 photoactivity。

The mixture phase of anatase and rutile showed the highest photoactivity, and the photoactivity for rutile was most low, due to that more hydroxyl radicals were detected in the suspension of mixture phase of anatase and rutile.

混晶样品具有最高的光催化活性，金红石光催化活性最差，这主要是因为混晶样品在可见激发下所产生的羟基自由基最多，而金红石样品能够生成的羟基自由基最少。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。