Sensitization of photocatalytic activity of S- or N-doped TiO2 particles by adsorbing Fe3+ cations
Sensitization of photocatalytic activity of S- or N-doped TiO2 particles by adsorbing Fe3+ cations
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DOI：
10.1016/j.apcata.2005.12.010
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发表时间：
2006-03
影响因子：
5.5
通讯作者：
T. Ohno;Z. Miyamoto;K. Nishijima;H. Kanemitsu;Feng Xueyuan
中科院分区：
文献类型：
--
作者：
T. Ohno;Z. Miyamoto;K. Nishijima;H. Kanemitsu;Feng Xueyuan
提出了一种仅将 Fe3+ 离子掺杂到 S 或 N 掺杂 TiO2 表面的新方法。与未经S或N掺杂的TiO2处理的Fe3+离子相比，吸附在S或N掺杂的TiO2光催化剂上的Fe3+离子氧化2-丙醇的光催化活性在宽范围的入射光波长（包括紫外光和可见光）下显着提高。当S掺杂TiO2颗粒上吸附的Fe3+离子量为0.90wt.%时，光催化活性达到最大。对于N掺杂Fe3+离子的TiO2，Fe3+离子的最佳含量为0.36wt.%。当Fe3+离子含量大于1.0wt.%时，S或N掺杂TiO2光催化剂上吸附的Fe3+离子的光催化活性逐渐下降。此外，当观察到吸附有Fe3+离子的S或N掺杂TiO2光催化剂经NaBH4还原并随后空气氧化后，观察到其光催化活性进一步提高。在这种情况下，S-和N-掺杂TiO2光催化剂表面Fe3+的最佳吸附量分别为2.81和0.88wt.%。处理过程中，吸附在S或N掺杂TiO2上的Fe3+离子被还原生成金属Fe，而Fe在通气条件下再次被再氧化形成Fe3+离子。处理后，S掺杂TiO2上吸附的Fe3+离子的晶体结构和光催化剂上2-丙醇的吸附能力发生了变化。
A new method to dope Fe3+ions only onto the surface of S- or N-doped TiO2is proposed. The photocatalytic activities of Fe3+ions adsorbed on S- or N-doped TiO2photocatalysts for oxidation of 2-propanol are markedly improved compared to those of S- or N-doped TiO2without treatment of Fe3+ions under a wide range of incident light wavelengths, including UV light and visible light. When the amount of Fe3+ions adsorbed on S-doped TiO2particles was 0.90wt.%, photocatalytic activity reached maximum. In the case of N-doped TiO2with Fe3+ions, the optimum amount of Fe3+ions was 0.36wt.%. The photocatalytic activities of Fe3+ions adsorbed on S- or N-doped TiO2photocatalysts decreased gradually when the amount of Fe3+ions was greater than 1.0wt.%. In addition, when S- or N-doped TiO2photocatalysts adsorbed with Fe3+ions was observed after reduction by NaBH4followed by air oxidation, further improvement in their photocatalytic activities were observed. In this case, the optimum amounts of Fe3+adsorbed on the surfaces of S- and N-doped TiO2photocatalysts were 2.81 and 0.88wt.%, respectively. During the treatment, Fe3+ions adsorbed on S- or N-doped TiO2were reduced to generate metal Fe, and Fe was reoxidized again to form Fe3+ions under an aerated condition. After the treatment, the crystal structure of Fe3+ions adsorbed on S-doped TiO2and adsorbtivity of 2-propanol on the photocatalyst were changed.