纳米晶单斜相 BiVO4 薄膜电极的制备及其光电催化性能。
Fabrication and photoelectrocatalytic properties of nanocrystalline monoclinic BiVO4 thin-film electrode.
机构信息
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
出版信息
J Environ Sci (China). 2011;23(1):151-9. doi: 10.1016/s1001-0742(10)60387-7.
Monoclinic bismuth vanadate (BiVO4) thin film was fabricated on indium-tin oxide glass from an amorphous heteronuclear complex via dip-coating. After annealation at 400, 500, and 600 degrees C, the thin films were characterized by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectrophotometry. The BiVO4 particles on the ITO glass surface had a monoclinic structure. The UV-Visible diffuse reflection spectra showed the BiVO4 thin film had photoabsorption properties, with a band gap around 2.5 eV. In addition, the thin film showed high visible photocatalytic activities towards 2,4-dichlorophenol and Bisphenol A degradation under visible light irradiation (lambda > 420 nm). Over 90% of the two organic pollutants were removed in 5 hr. A possible degradation mechanism of 2,4-dichlorophenol were also studied.
四方晶系的氧化铋钒（BiVO4）薄膜是通过浸涂法由非晶态杂核配合物在铟锡氧化物玻璃上制备的。在 400、500 和 600°C 下退火后，通过 X 射线衍射、场发射扫描电子显微镜、X 射线光电子能谱和紫外可见分光光度法对薄膜进行了表征。ITO 玻璃表面上的 BiVO4 颗粒具有四方晶系结构。紫外可见漫反射光谱表明，BiVO4 薄膜具有光吸收性能，带隙约为 2.5 eV。此外，该薄膜在可见光照射下（lambda > 420nm）对 2,4-二氯苯酚和双酚 A 的降解具有很高的可见光光催化活性。在 5 小时内，两种有机污染物的去除率超过 90%。还研究了 2,4-二氯苯酚的可能降解机制。
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