Synthesis of 42-faceted bismuth vanadate microcrystals for enhanced photocatalytic activity
Synthesis of 42-faceted bismuth vanadate microcrystals for enhanced photocatalytic activity
复制标题
42面钒酸铋微晶的合成以增强光催化活性
DOI：
10.1016/j.jcis.2019.02.008
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发表时间：
2019
影响因子：
9.9
通讯作者：
Lu Gang
中科院分区：
文献类型：
--
作者：
Zhai Xueting;Li Zhuoyao;Lu Zichen;Wang Guilin;Li Ping;Gao Yongqian;Huang Xiao;Huang Wei;Uji-i Hiroshi;Lu Gang
采用水热法将BiVO 4八面体晶体截短，合成了包含42个高低折射率晶面的BiVO 4微晶。通过改变酸浓度、反应温度和反应时间，可以调节BiVO 4晶体的尺寸和形状。与未截断的BiVO 4八面体晶体相比，42-faceted晶体在降解罗丹明B分子时表现出更强的光催化活性，这是由于暴露的低折射率和高折射率晶面上的电荷分离增强所致。这在亚粒子水平上通过分别在热电子和空穴累积面上选择性地光沉积金和氧化锰纳米粒子来证实。本研究结果将为合成更高效的BiVO 4及其他多元金属氧化物光催化剂提供指导。此外，所合成的微晶是研究BiVO 4单颗粒和亚颗粒光催化性能的理想材料。
Bismuth vanadate (BiVO4) microcrystals enclosed with up to 42 low and high index facets were synthesized through truncation of BiVO4octahedral crystals via a simple and highly reproducible hydrothermal method. The size and shape of the truncated BiVO4crystals could be tuned by varying the acid concentration, reaction temperature and reaction period. Compared to the BiVO4octahedral crystals without truncation, the 42-faceted ones showed an enhanced photocatalytic activity in the degradation of rhodamine B molecules due to the enhanced charge separation on the exposed low and high index facets. This was confirmed at sub-particle level by the photo-deposition of gold and manganese oxide nanoparticles selectively on hot electron and hole accumulated facets, respectively. Our results will provide a guideline for the synthesis of more efficient BiVO4and many other multinary metal oxide-based photocatalysts. Moreover, the synthesized microcrystals are perfect materials for the study of photocatalytic property of BiVO4at single and sub-particle level.