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| 本帖產(chǎn)生 1 個(gè) 翻譯EPI ，點(diǎn)擊這里進(jìn)行查看 | |||
xiangshang金蟲(chóng) (小有名氣)
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[交流]
求做光催化高手翻譯一段話
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| 鈦酸鍶鋇之所以能作為光催化劑，與其自身的光電特性有關(guān)。它屬N型半導(dǎo)體，其能帶是不連續(xù)的，在充滿電子的低能價(jià)帶VB和空的高能導(dǎo)帶CB之間存在一個(gè)禁帶。當(dāng)用能量等于或大于禁帶寬度ES的光照射鈦酸鍶鋇時(shí)，其價(jià)帶上的電子(e-)就會(huì)被激發(fā)，越過(guò)禁帶躍遷到導(dǎo)帶，同時(shí)在價(jià)帶上產(chǎn)生空穴(h+)，形成電子－空穴對(duì)。吸附“溶解”在鈦酸鍶鋇表面的氧通過(guò)俘獲電子形成•O2，而空穴則將吸附在鈦酸鍶鋇表面的OH-和H2O氧化成HO•。生成的原子氧和氫氧自由基有很強(qiáng)的化學(xué)活性。HO•基團(tuán)的氧化能力很強(qiáng)，有機(jī)物可以被其氧化分解，最終分解為二氧化碳和水；而原子氧能與多數(shù)有機(jī)物反應(yīng)，使得有機(jī)物得到降解，同時(shí)能氧化細(xì)菌內(nèi)的有機(jī)物，生成CO2和H2O，原子氧還能氧化有毒的無(wú)機(jī)物，使之在短時(shí)間內(nèi)失去毒性。由圖可以看出，BaTiO3對(duì)亞甲基藍(lán)的降解效果最好，這與其光致發(fā)光譜信號(hào)最弱和帶隙能量較低的結(jié)果一致。當(dāng)BaTiO3中的部分Ba2+被Sr2+取代后，其光催化活性降低，可能是由于Sr的原子半徑比Ba小，生成的光生電子與空穴更易復(fù)合。在5 mol/L NaOH溶液中比在2 mol/L 和10 mol/L NaOH溶液中制備的Ba0.7Sr0.3TiO3的光催化能力更強(qiáng)，0.5 g催化劑加入到200 ml 10 mg/L的亞甲基藍(lán)溶液中，光催化反應(yīng)120 min，其降解率達(dá)40%，這是由于圖2-5(b)中5 mol/L NaOH溶液制得產(chǎn)品粒子的粒徑更小，比表面積大，對(duì)光的吸收能力強(qiáng)，與被降解物接觸更充分的原因。 |
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tangqifeng
木蟲(chóng) (正式寫(xiě)手)
- 翻譯EPI: 1
- 應(yīng)助: 1 (幼兒園)
- 金幣: 2309.5
- 散金: 50
- 紅花: 1
- 帖子: 550
- 在線: 197小時(shí)
- 蟲(chóng)號(hào): 1029745
- 注冊(cè): 2010-05-27
- 性別: GG
- 專業(yè): 材料冶金過(guò)程工程
★ ★
wypward(金幣+2):歡迎新蟲(chóng)，謝謝參與 2010-06-03 17:34:38
xiangshang(金幣+5, 翻譯EPI+1):謝謝你的參與！ 2010-06-04 10:33:55
wypward(金幣+2):歡迎新蟲(chóng)，謝謝參與 2010-06-03 17:34:38
xiangshang(金幣+5, 翻譯EPI+1):謝謝你的參與！ 2010-06-04 10:33:55
| BST is able to as a photocatalyst because of its own optical characteristics. It is a N-type semiconductor which the energy is not continuous, low-energy electrons in the filled valence band VB and the empty conduction band energy of a band gap between the CB. When using the energy band gap equal to or greater than the light irradiation ES BST, its price band of electronic (e-) will be excited over the band gap transition to the conduction band, while the valence band holes generated (h +), the formation of electron - hole pairs. Adsorption "dissolved" in the BST surface oxygen by trapping electrons • O2, while the hole will be absorbed on the surface of barium strontium titanate OH-and H2O oxidation of HO •. Generation of atomic oxygen and hydroxyl radicals have a very strong chemical activity. HO • a strong group of oxidation, the oxidation decomposition of organic matter can be finally broken down into carbon dioxide and water; the atomic oxygen reaction with most organic compounds, making organic matter are degraded, while the oxidation of organic matter in bacteria to produce CO2 and H2O , atomic oxygen oxidation of toxic inorganic substances can make in a short time to lose toxicity. Can be seen from the chart, BaTiO3 the degradation of methylene blue the best, this photoluminescence signal with the weakest and the band gap energy lower results. As part of BaTiO3 in the Sr2 + Ba2 + was replaced, their photocatalytic activity decreased, probably due to the atomic radius of Sr than Ba is small, light generated electron and hole Gengyi compound. In 5 mol / L NaOH solution than in the 2 mol / L and 10 mol / L NaOH solution prepared photocatalytic stronger Ba0.7Sr0.3TiO3, 0.5 g catalyst to 200 ml 10 mg / L methylene blue solution in the photocatalytic reaction 120 min, the degradation rate of 40%, which is due to map 2-5 (b) in 5 mol / L NaOH solution was prepared products smaller particle size, large surface area, light absorption ability, and the degradation products were more fully the reasons for exposure. |
2樓2010-06-03 17:29:10
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