M@MIL-100(Fe) (M = Au, Pd, Pt) nanocomposites fabricated by a facile photodeposition process: Efficient visible-light photocatalysts for redox reactions in water
M@MIL-100(Fe) (M = Au, Pd, Pt) nanocomposites fabricated by a facile photodeposition process: Efficient visible-light photocatalysts for redox reactions in water
复制标题
通过简便的光沉积工艺制备的 M@MIL-100(Fe)（M = Au、Pd、Pt）纳米复合材料：用于水中氧化还原反应的高效可见光光催化剂
DOI：
10.1007/s12274-015-0824-9
复制
发表时间：
2015-10-01
期刊：
影响因子：
9.9
通讯作者：
Wu, Ling
中科院分区：
文献类型：
--
作者：
Liang, Ruowen;Jing, Fenfen;Wu, Ling
合理地设计和制备高性能、稳定的双功能光催化材料仍然是一个重要的研究目标。在这项工作中，高分散的贵金属纳米粒子(金、钯、铂)被固定在MIL-100(Fe)(记为M@MIL-100(Fe))上。与空白MIL-100(Fe)相比，M@MIL-100(Fe)(M=Au，Pd和Pt)纳米复合材料在可见光照射(λ≥420 nm)下对甲基橙(MO)的光催化降解和重金属离子的还原表现出更高的光催化活性。结合光电化学分析表明，贵金属沉积可以有效地提高MIL-100(Fe)在可见光照射下的电荷分离效率。这一现象反过来又导致M@MIL-100(Fe)的可见光驱动光催化氧化还原反应活性增强。与M@MIL-100(Fe)(M=Au和Pd)相比，平均粒径为2 nm的Pt@MIL-100(Fe)的光催化活性显著增强，这归因于增强的光吸收强度和更有效地分离光生载流子的综合作用。此外，还提出了可能的光催化反应机理。
Proper design and preparation of high-performance and stable dual functional photocatalytic materials remains a significant objective of research. In this work, highly dispersed noble-metal nanoparticles (Au, Pd, Pt) were immobilized on MIL-100(Fe) (denoted M@MIL-100(Fe)) using a facile room-temperature photodeposition technique. The resulting M@MIL-100(Fe) (M = Au, Pd, and Pt) nanocomposites exhibited enhanced photoactivities toward photocatalytic degradation of methyl orange (MO) and reduction of heavy-metal Cr(VI) ions under visible-light irradiation (λ ≥ 420 nm) compared with blank-MIL-100(Fe). Combining these results with photoelectrochemical analyses revealed that noble-metal deposition can effectively improve the charge-separation efficiency of MIL-100(Fe) under visible-light irradiation. This phenomenon in turn leads to the enhancement of visible-light-driven photoactivity of M@MIL-100(Fe) toward photocatalytic redox reactions. In particular, the Pt@MIL-100(Fe) with an average Pt particle size of 2 nm exhibited remarkably enhanced photoactivities compared with those of M@MIL-100(Fe) (M = Au and Pd), which can be attributed to the integrative effect of the enhanced light absorption intensity and more efficient separation of the photogenerated charge carrier. In addition, possible photocatalytic reaction mechanisms are also proposed.