Photoinduced Formation of Fe(III)−Sulfato Complexes on the Surface of α-Fe2O3 and Their Photochemical Performance
Photoinduced Formation of Fe(III)−Sulfato Complexes on the Surface of α-Fe2O3 and Their Photochemical Performance
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DOI：
10.1021/jp8088275
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发表时间：
2009-06
影响因子：
3.7
通讯作者：
Hongbo Fu;Tongguang Xu;Shaogui Yang;Shicheng Zhang;Jianmin Chen
中科院分区：
文献类型：
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作者：
Hongbo Fu;Tongguang Xu;Shaogui Yang;Shicheng Zhang;Jianmin Chen
漫反射红外傅立叶变换光谱（DRIFTS）研究了SO2在α-Fe2O3表面吸附时原位光化学生成硫酸盐配合物的过程。在220 K有O2存在的情况下，氧化物表面的SO2吸附比在黑暗条件下的吸附更明显，而在297 K有光的情况下，氧化物表面的SO2吸附量没有在黑暗条件下明显增加。在光照和黑暗条件下，吸收的SO2主要转化为双齿配合物。而在无氧条件下，硫酸盐络合物主要以单齿配位形式存在于氧化物表面。表面配合物不稳定，可能参与界面光化学反应。这些配合物还影响氧化物的性质，包括光学性质、电化学性质和表面润湿性。本文对其光化学机理进行了讨论。
Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) has been used to examine the in situ photochemical formation of sulfate complexes from the adsorption of SO2 on the α-Fe2O3 surface. The SO2 adsorption on the oxide surface under irradiation was more pronounced than the adsorption in the dark at 220 K in the presence of O2, whereas the presence of light did not show as significant of an increase in the amount of adsorption compared to the dark experiment at 297 K. The uptake of SO2 was mainly transformed to bidentate complexes in the presence of oxygen both under the irradiation and in the dark. In contrast, the sulfate complex existed mainly in a monodentate coordination on the oxide surface in the absence of O2. The surface complexes were not stable and could be involved in interfacial photochemical reactions. These complexes also affected the oxide properties, including optical properties, electrochemistry, and surface wettability. The photochemical mechanism has been discussed in ter...