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首页> 外文期刊>Science of advanced materials >Hydrothermal Synthesis and Characterization of Cu2+/F- Co-Doped Titanium Dioxide (TiO2) Nanotubes as Photocatalyst for Methyl Orange Degradation
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Hydrothermal Synthesis and Characterization of Cu2+/F- Co-Doped Titanium Dioxide (TiO2) Nanotubes as Photocatalyst for Methyl Orange Degradation

机译：Cu2 + / F-共掺杂二氧化钛（TiO2）纳米管的水热合成及表征甲基橙降解的光催化剂

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Cu2+/F- co-doped titanium dioxide (TiO2) nanotubes were synthesized using simple hydrothermal method. The hydrothermal was carried out at 150 degrees C for 24 hours using commercial TiO2 powder (MERCK) as TiO2 nanotubes precursor and Cu(NO3)(2) and NH4F as Cu2+ dopant and F- co-dopant respectively in 100 ml NaOH (10 M). The co-doped TiO2 nanotubes photocatalyst were characterized by X-ray diffraction (XRD), nitrogen gas adsorption, transmission electron microscopy (TEM) and Energy Dispersive Spectroscopy (EDS). XRD analysis reveals a new TiO2 hexagonal phase was obtained after Cu2+ and F- co-doping. Pure TiO2 nanotubes is anatase TiO2 (tetragonal) phase. TEM results show that the samples possessed hollow tubular morphology with the outer diameter within 8-10 nm and several hundred nanometer in length. The surface area of Cu2+/Fco- doped TiO2 nanotubes was found to be higher than undoped and single metal ion (Cu2+) doped TiO2 nanotubes. However all studied nanotube samples show large surface area (>= 200 m(2)/g) attributed to their hollow tubular structure. XPS study suggests the co-doping of TiO2 with Cu2+ and F- initiated the formation of Ti3+ besides the existences Ti4+, which assisted the photodegradation of MO. Cu2+ doping was incorporated into interstitial positions of TiO2 lattice, while F- co-doping highly dispersed into TiO2 by replacing and occupied the oxygen site in the TiO2 crystal lattice to form solid solution of TiO2-xFx.
机译：采用简单的水热法合成了Cu2 + / F-共掺杂的二氧化钛（TiO2）纳米管。使用市售TiO2粉末（MERCK）作为TiO2纳米管前驱体，分别以Cu（NO3）（2）和NH4F作为Cu2 +掺杂剂和F-共掺杂剂在100 ml NaOH（10 M ）。通过X射线衍射（XRD），氮气吸附，透射电子显微镜（TEM）和能量分散光谱（EDS）对共掺杂的TiO2纳米管光催化剂进行了表征。 XRD分析表明，Cu2 +和F-共掺杂后获得了新的TiO2六方相。纯TiO2纳米管是锐钛矿型TiO2（四方）相。透射电镜结果表明，样品具有中空管状形态，外径在8-10 nm之间，长度为几百纳米。发现Cu2 + / Fco掺杂的TiO2纳米管的表面积比未掺杂和单金属离子（Cu2 +）掺杂的TiO2纳米管的表面积高。但是，所有研究的纳米管样品均显示出大表面积（> = 200 m（2）/ g），这归因于其空心管状结构。 XPS研究表明，除了存在Ti4 +外，TiO2与Cu2 +和F-共同掺杂还引发了Ti3 +的形成，这有助于MO的光降解。 Cu 2+掺杂被掺入TiO2晶格的间隙位置，而F-掺杂通过置换并占据TiO2晶格中的氧位而高度分散到TiO2中，形成TiO2-xFx固溶体。

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