Ag3PO4/BiPO4 p–n heterojunction nanocomposite prepared in room-temperature ionic liquid medium with improved photocatalytic activity
Ag3PO4/BiPO4 p–n heterojunction nanocomposite prepared in room-temperature ionic liquid medium with improved photocatalytic activity
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DOI：
10.1016/j.mssp.2015.05.066
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发表时间：
2015-11
影响因子：
4.1
通讯作者：
N. Mohaghegh;E. Rahimi;M. Gholami
中科院分区：
文献类型：
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作者：
N. Mohaghegh;E. Rahimi;M. Gholami
使用 2-羟乙基甲酸铵 (RTIL) 作为室温离子液体，通过共沉淀水热工艺制备了具有 p-n 异质结结构的可见光活性 Ag3PO4/BiPO4 纳米复合材料。通过各种技术对所得催化剂进行了表征。通过在可见光和紫外光照射下酞菁活性蓝21（RB21）的光降解来评估光催化剂的光催化活性。结果表明，与纯 Ag3PO4 和 BiPO4 相比，在 RTIL 中制备的异质结复合材料的 RB21 光降解效率和速率均显着提高。 RTIL 中制备的 Ag3PO4/BiPO4 异质结构增强的光催化活性主要归因于异质结界面处建立的内部电场以及跨 p-n 结的有效电荷分离和转移。 RTIL 还可以帮助减小晶体尺寸、有序分布颗粒、防止孔结构崩溃以及复合材料表面积的损失。
A visible-light-active Ag3PO4/BiPO4nanocomposite with a p–n heterojunction structure was fabricated via a co-precipitation hydrothermal process using 2-hydroxylethylammonium formate (RTIL) as a room-temperature ionic liquid. The resulting catalysts were characterized by various techniques. The photocatalytic activity of the photocatalysts was evaluated by the photodegradation of phthalocyanine Reactive Blue 21 (RB21) under both visible and UV light irradiations. The results reveal that the heterojunction composite prepared in RTIL noticeably exhibited an improvement in both efficiency and rate of RB21 photodegradation in comparison with pure Ag3PO4and BiPO4. The enhanced photocatalytic activity of Ag3PO4/BiPO4heterostructure prepared in RTIL is mainly ascribed to the internal electric field built at the heterojunction interface and efficient charge separation and transfer across the p–n junction. RTIL can also assist in decreasing the crystalline size, orderly distributing the particles, preventing the collapse of pore structures, and losing of composite surface area.