Highly active BiVO4 nanoparticles: The enhanced photocatalytic properties under natural sunlight for removal of phenol from wastewater
Highly active BiVO4 nanoparticles: The enhanced photocatalytic properties under natural sunlight for removal of phenol from wastewater
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DOI：
10.1016/j.seppur.2014.11.036
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发表时间：
2015-02
影响因子：
8.6
通讯作者：
S. Kunduz;G. S. Soylu
中科院分区：
文献类型：
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作者：
S. Kunduz;G. S. Soylu
采用水热法制备了不同pH值的钒酸铋催化剂。采用BET、XRD、Raman、SEM、DRS、FT-IR和PL等技术对材料进行了表征。结果表明，前驱体溶液的pH值对产物的形貌和结构有显著影响。在自然光照条件下，对样品在少量h2o2存在下降解苯酚的光催化活性进行了评价。在pH 2和100℃条件下制备的BiVO4（2 - 100）样品在90 min内苯酚降解率最高（100%），反应速率最高（1.41 mg L−1min−1）。此外，TOC去除率可达95%。单斜型bivo4被发现对光降解更有效。BiVO4（2-100）样品的高光催化活性与催化剂表面存在丰富的羟基有关，羟基可以通过捕获空穴和产生自由基作为强氧化剂来防止电子-空穴复合。
Bismuth vanadate catalysts were prepared at different pH values by hydrothermal method. The materials were characterized by BET, XRD, Raman, SEM, DRS, FT-IR and PL techniques. It revealed that the pH value of the precursor solution can influence significantly on the morphology and structure of the product. The photocatalytic activities of the samples were evaluated for the degradation of phenol in the presence of a small amount of H2O2under natural sunlight. The BiVO4(2–100) sample prepared at pH 2 and 100 °C showed the highest percentage of phenol degradation (100%) and highest reaction rate (1.41 mg L−1min−1) in 90 min. In addition, 95% TOC removal can be achieved. Monoclinic form of BiVO4is found to be more effective for photodegradation. This high photocatalytic activity of BiVO4(2–100) sample is associated with the affluence of hydroxyl groups present on the catalyst surface, which can prevent the electron–hole recombination by trapping hole and generating of radicals acting as powerful oxidants.