Iodine-Doped TiO2 Photocatalysts: Correlation between Band Structure and Mechanism
Iodine-Doped TiO2 Photocatalysts: Correlation between Band Structure and Mechanism
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DOI：
10.1021/jp804985f
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发表时间：
2008-08
影响因子：
3.7
通讯作者：
S. Tojo;T. Tachikawa;M. Fujitsuka;T. Majima
中科院分区：
文献类型：
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作者：
S. Tojo;T. Tachikawa;M. Fujitsuka;T. Majima
水热法制备的碘掺杂TiO 2粉体（I-TiO 2）在紫外光和可见光区域具有吸收特性，可用作紫外光或可见光照射的光催化剂。采用XRD、TEM、EDS、XPS、FTIR和稳态紫外-维斯漫反射光谱（DRS）等手段对I-TiO 2粉体进行了表征，并以4-氯苯酚（4-CP）为降解对象，研究了其光催化活性。一个更高的光降解效率的4-CP观察I-TiO 2在紫外光和可见光照射下，相比，未掺杂的TiO 2。利用时间分辨漫反射（TDR）光谱研究了未掺杂TiO 2和I-TiO 2粉末在紫外或可见激光闪光光解过程中光生载流子（如俘获电子（e-）和空穴（h+））的瞬态行为以及衬底的单电子氧化动力学。瞬态信号的时间演化表明长寿命的光生h+是由长寿命的光生h+产生的。
Iodine-doped TiO2 powders (I-TiO2) prepared via hydrothermal treatment have absorption in the region of ultraviolet (UV) and visible light, and were used as a photocatalyst with irradiation of UV or visible light. The I-TiO2 powders were characterized by XRD, TEM, EDS, XPS, FTIR, and steady-state UV−vis diffuse reflectance spectra (DRS), and their photocatalytic activities were investigated based on the photodegradation of 4-chlorophenol (4-CP) in water. A higher photodegradation efficiency of 4-CP was observed for I-TiO2 under UV- and visible-light irradiation, when compared to the undoped TiO2. The transient behavior of the photogenerated charge carriers, such as trapped electrons (e−) and holes (h+), and the one-electron oxidation dynamics of substrates during UV or visible laser flash photolysis of undoped TiO2 and I-TiO2 powders were investigated using time-resolved diffuse reflectance (TDR) spectroscopy. The time evolution of transient signals indicated that the long-lived photogenerated h+ were for...