Effects of distortion of PO4 tetrahedron on the photocatalytic performances of BiPO4
Effects of distortion of PO4 tetrahedron on the photocatalytic performances of BiPO4
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DOI：
10.1039/c1cy00261a
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发表时间：
2011-01-01
影响因子：
5
通讯作者：
Zhu, Yongfa
中科院分区：
文献类型：
--
作者：
Pan, Chengsi;Li, Di;Zhu, Yongfa
用水热法选择性地合成了三种晶相BiPO4(HBIP、nMBIP和mMBIP)。溶液的酸度和反应温度是影响BiPO4三种晶相形成的主要因素。具有nMBIP相结构的BiPO4在紫外光照射下对MB溶液的降解活性高于HBIP和mMBIP。NMBIP的单位表面积催化活性(3.8×10(5)h(-1)m(-2))约为P25(1.4×10(-4)h(-1)m(-2))的10倍。具有nMBIP结构的BiPO4显示出最高的活性，这是因为最扭曲的PO4四面体。由扭曲的PO4四面体产生的偶极矩的诱导效应促进了e(-)/h(+)对的分离，从而有利于光催化反应。这一关系可能有助于设计和开发其他高活性的含氧盐光催化剂。
Three kinds of crystal phase BiPO4 (HBIP, nMBIP and mMBIP) were selectively synthesized by a hydrothermal method. The governed factors for the formation of three crystal phase of BiPO4 were both on the acidity of the solution and reaction temperature. The BiPO4 with nMBIP phase structure showed higher activity for degradation of MB solution under UV irradiation than HBIP and mMBIP. The catalytic activity per surface area activity of nMBIP (3.8 x 10(5) h(-1) m(-2)) was about ten times higher than that of P25(1.4 x 10(-4) h(-1) m(-2)). The BiPO4 with nMBIP structure exhibited the highest activity due to the most distorted PO4 tetrahedron. The induce effect of the dipole moment derived from the distorted PO4 tetrahedron promoting the separation of e(-)/h(+) pairs and further benefited for the photocatalytic reaction. This correlation may help to design and develop other oxoacid salt photocatalysts with high activity.