In situ DRIFT study of photocatalytic degradation of gaseous isopropanol over BiVO4 under indoor illumination
In situ DRIFT study of photocatalytic degradation of gaseous isopropanol over BiVO4 under indoor illumination
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DOI：
10.1016/j.molcata.2010.05.009
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发表时间：
2010-07-15
影响因子：
--
通讯作者：
Yang, Thomas C. -K.
中科院分区：
文献类型：
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作者：
Huang, Chao-Ming;Pan, Guan-Ting;Yang, Thomas C. -K.
采用均相共沉淀法合成了可见光驱动的钒酸铋光催化剂。X射线衍射（XRD）结果表明，所得粉体由单斜晶系BiVO4组成。XPS和漫反射红外傅里叶变换光谱（DRIFTS）的表面表征证实了BiVO4表面羟基的存在。采用异丙醇（IPA）吸附和漫反射红外光谱（DRIFTS）研究了吸附能力对BiVO4光催化活性的影响。所有BiVO4样品都表现出比商业TiO2光催化剂更高的活性水平（P25）。FTIR光谱证实BiVO4的高光催化性能可归因于其表面丰富的羟基有利于IPA的高吸附。在90 ℃下合成24 h的样品（BV24）表现出最好的光催化活性，如使用初始光降解气态IPA的表观速率常数和长期光照后的矿化产率评估。对于720 min的辐照时间，BV24和P25的IPA矿化产率分别为88%和41%。这种高可见光活性归因于高吸附能力，高结晶，和大的表面羟基基团。(C)2010 Elsevier B.V.保留所有权利。
Visible-light-driven bismuth vanadate photocatalysts were synthesized using a homogeneous coprecipitation process. X-ray diffraction (XRD) results reveal that the obtained powders consisted of monoclinic BiVO4. Surface characterizations by XPS and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirm the presence of surface hydroxyl groups on BiVO4. The effect of adsorption ability on photocatalytic activity of BiVO4 was investigated by isopropanol (IPA) adsorption and DRIFTS. All BiVO4 samples exhibited a higher level of activity than that of a commercial TiO2 photocatalyst (P25). The FTIR spectra verifying the high photocatalytic performance of BiVO4 can be attributed to the rich surface hydroxyl groups that favor the high adsorption of IPA. The sample synthesized at 90 degrees C for 24h (BV24) exhibits the best photocatalytic activity as evaluated using the apparent rate constant for initial photodegradation of gaseous IPA and the mineralization yield after long-term light irradiation. For an irradiation time of 720 min, the mineralization yields of IPA were 88% and 41% for BV24 and P25, respectively. This high visible-light photoactivity was ascribed to high adsorption ability, high crystallization, and large surface hydroxyl groups. (C) 2010 Elsevier B.V. All rights reserved.