Relation between photocatalytic activity and preparation conditions for nitrogen-doped visible light-driven TiO2 photocatalysts
Relation between photocatalytic activity and preparation conditions for nitrogen-doped visible light-driven TiO2 photocatalysts
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DOI：
10.1016/j.apcata.2006.06.027
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发表时间：
2006-09
影响因子：
5.5
通讯作者：
S. Joung;T. Amemiya;M. Murabayashi;K. Itoh
中科院分区：
文献类型：
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作者：
S. Joung;T. Amemiya;M. Murabayashi;K. Itoh
在圆筒形管式炉中以氨气为气流，在不同温度和煅烧时间下制备了氮掺杂可见光驱动的TiO 2光催化剂粉体。禁带宽度为2.92 ~ 3.04eV，对应于可见光区。光吸收和电子自旋共振（ESR）光谱的强度，这表明掺杂的氮的浓度，在可见光区的煅烧温度和时间的下降，也是独立的光催化活性。结果表明，制备温度（673、773和873 K）和煅烧时间是影响N掺杂TiO 2光催化活性的重要因素：在673和873 K下制备的样品，煅烧时间分别为5和10 min时，光催化活性最高;在773 K下制备的样品，煅烧时间为60 min时，光催化活性最高。各煅烧温度下的活性物种可能如下：在673 K下煅烧5和10 min制备的样品的活性物种可能主要是氮物种（NO、NO2、NO2-、NH 2等）;在773 K保温60 min制备的样品中，氮原子主要为掺杂态氮，而在873 K保温5和10 min制备的样品中，氮原子和氮物种均为掺杂态氮。
Nitrogen-doped visible light-driven TiO2photocatalyst powders were prepared at different temperatures and with different calcination times in a cylindrical tubular furnace under a stream of ammonia gas. Band-gap energy was from 2.92 to 3.04eV, corresponding to the visible light region. Optical absorbance and the intensities of electron spin resonance (ESR) spectra, which indicate the concentration of doped nitrogen, decreased with temperature and time of calcination in the visible light region, and were also independent of photocatalytic activity. We found that the temperature of preparation (673, 773, and 873K) and calcination time were important factors governing the photocatalytic reactivity of the N-doped TiO2: the highest photocatalytic activities for samples prepared at 673 and 873K were observed with calcination times of 5 and 10min, while that for samples prepared at 773K was observed with a calcination time of 60min. Active species at each calcination temperature may be as follows: active species for samples prepared at 673K for 5 and 10min may mainly be nitrogen species (NO, NO2, NO2−, NH2, etc.); that for samples prepared at 773K for 60min may mainly be doped atomic nitrogen; and that for samples prepared at 873K for 5 and 10min may be doped atomic nitrogen and nitrogen species.