Hydrothermal synthesis and photocatalytic activities of stabilized bismuth vanadate/bismuth tungstate composites
Hydrothermal synthesis and photocatalytic activities of stabilized bismuth vanadate/bismuth tungstate composites
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DOI：
10.1016/j.jece.2018.01.062
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发表时间：
2018-04-01
影响因子：
7.7
通讯作者：
Ohtani, Bunsho
中科院分区：
文献类型：
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作者：
Ketwong, Pradudnet;Takashima, Mai;Ohtani, Bunsho
采用水热法合成了不同分数（f（V））的钒酸铋/钨酸铋（BVO/BWO）复合材料。复合材料的形貌分析表明，棒状BVO结构部分沉积在片状球（FB）BWO颗粒。此外，利用家用反向双光束光声光谱仪（PAS）和单光束光声光谱仪（PAS）分别对BWO、BVO和BVO/BWO的表面结构进行了电子陷阱能量分辨分布和导带底位置的研究。BVO/BWO的表观CBB约。0.4 eV阳极移动从BWO和几乎类似于BVO。在紫外可见光和可见光照射下的光催化放氧实验表明，BVO/BWO复合材料的光催化活性与f（V）有关，BVO/BWO复合材料的光催化活性明显高于BVO。在可见光下的延长和最高活性的光催化剂煅烧0.80 f（V）由于BVO稳定FB-BWO颗粒。
Bismuth vanadate/bismuth tungstate (BVO/BWO) composites in various BVO fractions (f(V)) were synthesized through hydrothermal reaction. Morphology analysis of the composites showed that rod-like BVO structures were partially deposited on flake-ball (FB) BWO particles. In addition, surface structures of BWO, BVO and BVO/BWO were studied in energy-resolved distribution of electron traps and conduction band-bottom (CBB) position by household reversed double-beam photoacoustic spectroscopy (PAS) and single-beam PAS, respectively. Apparent CBB of BVO/BWO was ca. 0.4 eV anodically shifted from BWO and almost similar to BVO. Moreover, photocatalytic oxygen liberation under irradiation of UV-vis and visible lights demonstrated that photocatalytic activities of the BVO/BWO composites were depended on f(V) and calcined BVO/BWO composites in which BVO was stabilized on BWO showed enhancement of photocatalytic activity comparing to a pristine BVO. The prolonged and the highest active photocatalyst under visible light was calcined 0.80 f(V) due to BVO stabilization on FB-BWO particles.