本文選題：納米復合材料 + 金　； 參考：《環(huán)境科學與技術(shù)》2017年S1期

【摘要】：染料污染和大氣中CO排放已成為日益嚴重環(huán)境問題,研發(fā)染料污染物的降解技術(shù)及低溫CO催化氧化有助于解決上述問題。利用高分辨透射電子顯微鏡(HRTEM)和X射線衍射(XRD)等技術(shù),該文比較了二氧化鈦(TiO_2)介孔微球修飾金(Au)納米顆粒前后的形貌、結(jié)構(gòu)與組成的變化及催化染料降解和低溫CO氧化的性能。結(jié)果表明,應(yīng)用沉積-沉淀法可將Au納米顆粒均勻地修飾在TiO_2介孔微球表面,顆粒直徑約為4.5 nm。XRD結(jié)果顯示Au~(3+)被還原為單質(zhì)Au,且還原過程沒有破壞TiO_2載體的晶體結(jié)構(gòu);電感耦合等離子體質(zhì)譜(ICP-MS)測試得出Au含量僅為3.12%。氮氣吸附-脫附等溫曲線測試出Au/TiO_2比表面積為103.6 m~2/g,相應(yīng)的Barret-JoynerHalenda(BJH)孔徑分布測試出平均孔徑為9.3 nm。有機染料羅丹明B(Rh B)的光催化降解結(jié)果顯示,Au/TiO_2復合催化劑催化下的降解速率為6.63×10-5s-1,而單一TiO_2催化下的降解速率為5.18×10~(-5)s~(-1)。亞甲基藍(MB)光降解實驗顯示出相同的結(jié)果,進一步證明Au/TiO_2復合催化劑具有較高的活性。低溫催化CO氧化測試結(jié)果表明,單一TiO_2不具有催化活性,Au/TiO_2催化作用時在室溫下CO轉(zhuǎn)化率達48%,升溫至50℃時CO轉(zhuǎn)化率可達到99%,顯示出很高的催化活性和熱穩(wěn)定性,并且可重復利用。可見,納米Au/TiO_2復合催化劑在處理有機染料污染和低溫CO氧化方面具有潛在的應(yīng)用價值。
[Abstract]:Dye pollution and CO emission in the atmosphere have become increasingly serious environmental problems. Research and development of degradation technology of dye pollutants and catalytic oxidation of CO at low temperature will help to solve these problems. By means of high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD), the morphology, structure and composition of TIO _ 2 / TIO _ 2 mesoporous microspheres modified with au) nanoparticles were compared, as well as the catalytic degradation of dyes and the performance of CO oxidation at low temperature. The results show that au nanoparticles can be uniformly modified on the surface of TiO2 mesoporous microspheres by deposit-precipitation method. The particle diameter is about 4.5nm.XRD. The results show that Au~(3) is reduced to au, and the crystal structure of TiO2 support is not destroyed during the reduction process. The results of inductively coupled plasma mass spectrometry (ICP-MS) show that the au content is only 3.12%. The specific surface area of Au/ TiO-2 is 103.6 mm2 / g, and the corresponding Barret-Joyner Halenda (BJH) pore size distribution is 9.3 nm. The photocatalytic degradation of organic dye Rhodamine (Rh B) shows that the degradation rate of Au/ TiO-2 composite catalyst is 6.63 脳 10 ~ (-5) s-1s ~ (-1), while that of a single TIO _ (2) catalyst is 5.18 脳 10 ~ (-10) ~ (-5) ~ (-1) ~ (-1) ~ (-1). The results of methylene blue MB-based photodegradation showed the same results, which further proved that the Au/ TiO-2 composite catalyst had higher activity. The results of low temperature catalytic CO oxidation test showed that TiO2 had no catalytic activity. The CO conversion reached 48 at room temperature and 99 at 50 鈩，

本文編號：2003260