Aerosol-assisted flow synthesis of B-doped, Ni-doped and B-Ni-codoped TiO2 solid and hollow microspheres for photocatalytic removal of NO
Aerosol-assisted flow synthesis of B-doped, Ni-doped and B-Ni-codoped TiO2 solid and hollow microspheres for photocatalytic removal of NO
复制标题
气溶胶辅助流动合成 B 掺杂、Ni 掺杂和 B-Ni 共掺杂 TiO2 实心和空心微球用于光催化去除 NO
DOI：
10.1016/j.apcatb.2008.12.020
复制
发表时间：
2009-07-15
影响因子：
22.1
通讯作者：
Lee, Shuncheng
中科院分区：
文献类型：
--
作者：
Huang, Yu;Ho, Wingkei;Lee, Shuncheng
本研究采用气溶胶辅助流动合成法直接合成了高效的B掺杂、Ni掺杂和B-Ni共掺杂TiO 2微球光催化剂。采用XRD、SEM、TEM、紫外可见漫反射光谱、氮吸附和XPS对所得样品进行了表征。表征结果表明，B掺杂和B-Ni共掺杂的TiO 2光催化剂均为空心微球结构，而Ni掺杂和未掺杂的TiO 2产物均由实心微球组成。结果表明，硼掺杂剂部分嵌入TiO 2的间隙结构中，以Ti-O-B结构形式存在。硼掺杂后，禁带宽度增大。而Ni掺杂和B-Ni共掺杂的TiO 2样品由于Ni的掺杂，其吸收边都发生了明显的红移。在模拟太阳光照射下，以NO为目标物，考察了样品的光催化活性。所有气溶胶辅助流动合成的样品具有更高的光催化活性比P25和掺杂的TiO 2微球表现出增强的光催化活性比未掺杂的同行。更有趣的是，B-Ni共掺杂的TiO 2光催化剂具有上级的光催化活性比所制备的单一掺杂的TiO 2产品。在表征的基础上，对空心微球和实心微球的形成机理进行了探讨。我们认为，这种一般的方法可以很容易地放大工业生产的高活性的微球光催化剂，有效地去除NO在模拟太阳光照射下。(C)2008 Elsevier B. V.保留所有权利。
In this Study, highly effective B-doped, Ni-doped and B-Ni-codoped TiO2 microspheres photocatalysts were directly synthesized via an aerosol-assisted flow synthesis method. The resulting samples were characterized by XRD, SEM, TEM, UV-vis diffuse reflectance spectroscopy, nitrogen adsorption and XPS. The characterizations revealed hollow microspherical structure of the B-doped and B-Ni-codoped TiO2 photocatalysts, while the Ni-doped and undoped TiO2 products consisted of solid microspheres. It was found that the boron dopant was partially embedded into the interstitial TiO2 structure, existing in the form of Ti-O-B Structure. The band gap was enlarged after the boron doping. However, both Ni-doped and B-Ni-codoped TiO2 samples showed obvious red shift in their absorption edges because of the Ni doping. The photocatalytic activities of these samples were evaluated on the photocatalytic removal of NO under simulated solar light irradiation. All the aerosol-assisted flow synthesized samples had much higher photocatalytic activities than P25 and the doped TiO2 microspheres exhibited enhanced photocatalytic activity than the undoped counterparts. More interestingly, the B-Ni-codoped TiO2 photocatalyst possessed Superior photocatalytic activity to the as-prepared single doped TiO2 products. The enhanced photocatalytic activity was explained and the formation mechanisms of hollow and solid microspheres were also proposed oil the basis of characterizations. We think this general method may be easily scaled up for industrial production of highly active microspherical photocatalysts for efficient NO removal under sitmulated solar light irradiation. (C) 2008 Elsevier B.V. All rights reserved.