Photocatalytic Degradation of 4-Nitrophenol on Well Characterized Sol-Gel Molybdenum Doped Titania Semiconductors
Photocatalytic Degradation of 4-Nitrophenol on Well Characterized Sol-Gel Molybdenum Doped Titania Semiconductors
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DOI：
10.1007/s11244-011-9614-0
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发表时间：
2011-06-01
影响因子：
3.6
通讯作者：
Gomez, Ricardo
中科院分区：
文献类型：
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作者：
Lopez, Rosendo;Gomez, Ricardo
采用溶胶-凝胶法合成了不同Mo含量（0- 5.0wt%）的介孔TiO 2-Mo材料。在500 ℃退火的样品中，获得的比表面积范围为150至86 m2/g。X射线衍射谱表明，二氧化钛纳米晶相（类似于28 nm）的存在下，钼显着加强。紫外-可见漫反射光谱表明，随着Mo含量的增加，样品的禁带宽度向低能区移动。傅立叶变换红外分析证明，羟基化的样品在500 ℃退火后仍然存在。X射线光电子能谱分析表明，存在的Mo 4+和Mo 6+物种，其中Mo 6+可以从这种状态转化为较低的氧化态在退火处理。对4-硝基苯酚（4-NP）光催化降解的研究表明，Mo掺杂半导体的活性与其光催化剂的c晶胞参数有关。总矿化4-NP高达98%（TOC），在样品（1.0重量%钼）具有最高的光活性。
Mesoporous TiO2-Mo materials with different Mo contents (0-5.0 wt%) were synthesized by the sol-gel method. In samples annealed at 500 degrees C, specific surface areas ranging from 150 to 86 m(2)/g were obtained. X-ray diffraction spectra denoted that the titania anatase phase (similar to 28 nm) was significantly strengthened by the presence of Mo. The UV-vis diffuse reflectance spectra showed that the band gap was shifted to lower energy levels in the samples with higher Mo contents. Fourier transform infrared analysis evidenced that the hydroxylated samples persisted after annealing at 500 degrees C. X-ray photoelectron spectroscopy analyses showed the presence of Mo4+ and Mo6+ species, where Mo6+ can be transformed from this state to a lower oxidation state during the annealing treatments. The study of the photocatalytic degradation of 4-nitrophenol (4-NP) showed that the activity can be related to the c cell parameter of the anatase phase in the Mo-doped semiconductors. Total mineralization of 4-NP up to 98% (TOC) was obtained in the sample (1.0 wt% Mo) with the highest photoactivity.