Tailored Synthesis of Pt-Nanoparticle-Modified Mesoporous TiO2 Popcorn-Like Nanostructures for Photocatalytic Applications
Tailored Synthesis of Pt-Nanoparticle-Modified Mesoporous TiO2 Popcorn-Like Nanostructures for Photocatalytic Applications
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用于光催化应用的 Pt 纳米颗粒改性介孔 TiO2 爆米花状纳米结构的定制合成
DOI：
10.1002/slct.201902152
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发表时间：
2019
期刊：
影响因子：
2.1
通讯作者：
Lu Qifang
中科院分区：
文献类型：
--
作者：
Yang Qian;Guo Enyan;Sun Ke;Zhang Xuetao;Liu Hao;Lu Qifang
设计绿色高效的光催化剂对污染物降解具有重要意义，其中光生电荷分离对于提高光催化效率起着重要作用。通过水热法和化学还原相结合，成功合成了具有可调 Pt 含量的三维爆米花状 TiO2 介孔球。由于TiO2和Pt的协同作用，所得的Pt/TiO2介孔球表现出抑制的电荷复合。具体来说，TiO2 上的 Pt 纳米粒子有利于源自介孔 TiO2 的光生电子的收集和转移。密度泛函理论（DFT）计算结果进一步证实了Pt/TiO2 中更快的载流子分离。同时，特定的三维结构赋予Pt/TiO2球增强的光散射能力、高表面积和多孔结构。因此，与纯TiO2相比，新型Pt/TiO2介孔球的RhB光降解效率提高了数倍，其中1.0% Pt/TiO2表现出最高的光催化活性。这项工作提出了绿色高效光催化剂的新视角。
Designing green and efficient photocatalysts for pollutant degradation is of great significance, where the photogenerated charge separation plays an important role in improving the photocatalytic efficiency. A three‐dimensional popcorn‐like TiO2mesoporous sphere with tunable Pt contents has been successfully synthesized by a combination of hydrothermal process and chemical reduction. The resultant Pt/TiO2mesoporous spheres exhibit a suppressed charge recombination due to the synergic effect of TiO2and Pt. To be specific, the Pt nanoparticle on the TiO2facilitates the collection and transfer of the photogenerated electrons originated from the mesoporous TiO2. Density functional theory (DFT) calculated results further confirm the faster carries separation in Pt/TiO2. Meanwhile, the specific three‐dimensional structure endows Pt/TiO2spheres with enhanced light scattering ability, a high surface area, and porous structure. As a consequence, the novel Pt/TiO2mesoporous spheres present multiple fold enhancement on the RhB photodegradation efficiency compared with that of neat TiO2, in which 1.0% Pt/TiO2presents the highest photocatalytic activity. This work proposes a new perspective of green and efficient photocatalysts.