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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >N-doped TiO_2/C nanocomposites and N-doped TiO_2 synthesised at different thermal treatment temperatures with the same hydrothermal precursor
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N-doped TiO_2/C nanocomposites and N-doped TiO_2 synthesised at different thermal treatment temperatures with the same hydrothermal precursor

机译：相同的水热前体在不同的热处理温度下合成的N掺杂TiO_2 / C纳米复合材料和N掺杂TiO_2

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A hydrothermal precursor was first obtained by isopropyl titanate reacting with tetramethylammonium hydroxide (TMAOH), which acts as a source of nitrogen and carbon. A facile post-thermal treatment was employed to enhance the crystallinity and visible light photocatalytic activity of the as-prepared precursor. The resulting products of post-thermal treatment between 200 °C and 700 °C display different colours from brown to white. Black N-doped TiO_2 nanoparticles modified with carbon (denoted as N-TiO_2/C) were obtained at 300 °C, while yellow N-doped TiO_2 nanoparticles (denoted as N-TiO_2) were obtained at 500 °C. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) were applied to characterize N-TiO_2/C, N-TiO_2 and the evolution process during thermal treatment. The results show that for both N-TiO_2/C and N-TiO_2, nitrogen was doped into the lattice, thus narrowing the band gap and increasing the absorption in the visible light region. Moreover, for N-TiO_2/C, the carbon species modified on the surface and between the nanocrystals enhanced the visible light harvesting and increased the adsorption of the dye in the photodegradation measurement. The photocatalytic performance under visible light irradiation is N-TiO_2/C > N-TiO_2 > undoped TiO_2.
机译：首先通过钛酸异丙酯与氢氧化四甲铵（TMAOH）反应获得水热前体，氢氧化四甲铵是氮和碳的来源。采用简便的后热处理，以提高所制备前体的结晶度和可见光光催化活性。经过200°C至700°C的热处理后，所得产品显示出从棕色到白色的不同颜色。在300°C下获得黑色碳掺杂的N掺杂TiO_2纳米颗粒（表示为N-TiO_2 / C），而在500°C下获得黄色的N掺杂的TiO_2纳米颗粒（表示为N-TiO_2）。利用X射线衍射（XRD），傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对N-TiO_2 / C，N-TiO_2及其在热处理过程中的演化过程进行了表征。结果表明，对于N-TiO_2 / C和N-TiO_2，氮均被掺杂到晶格中，从而缩小了带隙并增加了可见光区域的吸收。此外，对于N-TiO_2 / C，在光降解测量中，在表面和纳米晶体之间改性的碳物种增强了可见光的收集并增加了染料的吸附。可见光照射下的光催化性能为N-TiO_2 / C> N-TiO_2>未掺杂的TiO_2。

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