2 NTs;光催化;硝基苯;有機(jī)物降解"/>

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新型TiO2 NTs制備和結(jié)構(gòu)控制及其硝基苯光催化性能研究
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東北石油大學(xué)

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國家自然科學(xué)基金資助(項目號21376046);東北石油大學(xué)青年基金(NEPUQN2015-1-06);東北石油大學(xué)研究生創(chuàng)新項目(YJSCX2016-017NEPU)


The preparation and structural control of novel hierarchical TiO2 nanotube arrays and photocatalytic performance study of nitrobenzene
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    摘要:

    實驗采用二次陽極氧化法制備高度有序的陣列式TiO2納米管(TiO2 NTs),分別利用掃描電鏡(SEM)、能譜儀(EDS)、X射線衍射儀(XRD)和紫外-可見漫反射光譜儀(UV-vis DRS)對制得的TiO2 NTs的微觀形貌及光響應(yīng)范圍進(jìn)行表征與測試。SEM顯示經(jīng)過二次陽極氧化處理后,TiO2 NTs的形貌發(fā)生較大改變,呈現(xiàn)出良好的陣列效果。UV-vis DRS光譜顯示光響應(yīng)范圍明顯發(fā)生紅移。將硝基苯作為目標(biāo)有機(jī)污染物,利用TiO2 NTs作為光催化劑對其進(jìn)行光催化降解。結(jié)果顯示,TiO2 NTs能有效降解廢水中的硝基苯,并且經(jīng)二次陽極氧化制得的陣列式TiO2納米管(2-step TiO2 NTs)的光催化活性遠(yuǎn)遠(yuǎn)優(yōu)于經(jīng)一次氧化的TiO2納米管(1-step TiO2 NTs),能顯著提高對硝基苯的降解效率。推測活性增加的原因是經(jīng)二次氧化形成的陣列式雙層納米管結(jié)構(gòu)增大了催化劑的比表面積,同時增加光通道,使TiO2納米管吸光范圍顯著增大,提升硝基苯的降解速率。

    Abstract:

    The highly ordered TiO2 nanotube arrays (2-step TiO2 NTs) were prepared via a facile two-step anodization method. The micro morphology, crystal form, elemental composition and photoresponse were characterized by SEM, XRD and UV-vis DRS respectively. The images of SEM showed that the 2-step TiO2 NTs exhibited superior array effect. At the same time, the UV-vis DRS showed that the range of photoresponse shifted towards long wave obviously. Nitrobenzene was utilized to be a target organic pollutant to characterize the catalyst performance. The result showed that nitrobenzene could be degraded by the 2-step TiO2 NTs effectively, and the photocatalytic activity of 2-step TiO2 NTs was far better than the 1-step TiO2 NTs. The photocatalytic degradation efficiency of nitrobenzene was improved remarkably. The reason of the efficiency improvement was caused by the highly ordered structure of the 2-step TiO2 NTs which increased the specific surface area of the photocatalyst. Therefore, the optical channel was increased, photoabsorption region was broadened and the photo-quantum efficiency was improved.

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張祎旸,谷笛,王寶輝.新型TiO2 NTs制備和結(jié)構(gòu)控制及其硝基苯光催化性能研究[J].稀有金屬材料與工程,2018,47(11):3542~3547.[Zhang Yiyang, Gu Di, Wang Baohui. The preparation and structural control of novel hierarchical TiO2 nanotube arrays and photocatalytic performance study of nitrobenzene[J]. Rare Metal Materials and Engineering,2018,47(11):3542~3547.]
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  • 收稿日期:2017-03-15
  • 最后修改日期:2017-04-10
  • 錄用日期:2017-04-14
  • 在線發(fā)布日期: 2018-12-19
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