| 查看: 225 | 回复: 1 | |||
| 当前主题已经存档。 | |||
zhzw_10181木虫 (小有名气)
|
[交流]
求助中文翻译成英文（一段话）
|
||
| 通常认为在钙钛矿结构的化合物中，A位离子为惰性组分，起平衡整个钙钛矿结构的作用，不直接参与化学反应，处于BO6八面体中心的B位离子为活性成分，在光催化反应中起主要作用。O的2p轨道构成价带，Fe3+的3d轨道在氧八面体场作用下分裂成能级不等的t2g和eg能级构成导带，Fe3+的3d电子构型为t2g3eg2, 当光催化剂受到能量大于或等于禁带宽度的光照射时, 价带电子被激发至导带, 产生光生电子和空穴，与催化剂表面的吸附氧和H2O结合产生•O2和•OH自由基等高活性物质，与染料发生氧化还原反应 |
回复此楼» 猜你喜欢
求调剂
已经有3人回复
-
297求调剂
已经有13人回复
-
288求调剂 一志愿哈工大 材料与化工
已经有12人回复
-
085600，320分求调剂
已经有10人回复
-
085600材料与化工调剂
已经有27人回复
-
求调剂，一志愿郑州大学材料与化工专硕，英二数二342分，求老师收留
已经有19人回复
-
292求调剂
已经有4人回复
-
270化工求调剂
已经有6人回复
-
材料295
已经有14人回复
-
266求调剂
已经有8人回复
zhzw_10181(金币+30):呵呵，谢谢啦 2010-02-28 20:50
| It is usually considered that the A-site cations are inert components in the perovskite compounds which play a role of stabilizing the perovskite structure instead of participating directly in the chemical reaction. The B-site cations occupying the center of the BO6 octahedra are active elements which have a major role in the photocatalytic reaction. The 2p orbitals of oxygen form the valence band. The 3d orbitals of Fe3+ split into unequal t2g and eg energy levels forming the conduction bands. The configuration of 3d electron of Fe3+ is t2g3eg2. When photocatalysts are irradiated by the lights having an energy equal or greater than that of the forbidden bandwidth, the electrons on the valence band are excited to the conduction band, resulting in photo-generated electrons and holes. Such electrons and holes combined with absorbed oxygens and H2O on the surface of the catalysts result in the highly active matters such as •O2 and •OH free radicals which generate redox reaction with dye. |
2楼2010-02-28 17:31:43
