Boosting photocatalytic activity of Pd decorated TiO2 nanocrystal with exposed (001) facets for selective alcohol oxidations

Boosting photocatalytic activity of Pd decorated TiO2 nanocrystal with exposed (001) facets for selective alcohol oxidations
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提高具有暴露 (001) 面的 Pd 修饰的 TiO2 纳米晶体的光催化活性,用于选择性醇氧化

DOI:
10.1016/j.apcatb.2016.05.018
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发表时间:
2016-10
期刊:
Applied Catalysis B: Environmental
影响因子:
--
通讯作者:
Yong Men
Yong Men
中科院分区:
其他
文献类型:
--
作者:
Jinguo Wang;Pinhua Rao;Wei An;Jingli Xu;Yong Men

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采用溶剂热水解结合光还原沉积的方法合成了具有暴露(001)面的Pd修饰tio2纳米晶体,该晶体在水介质中紫外光照射下光催化选择性醇氧化的活性和稳定性大大提高。暴露(001)面的Pd修饰tio2纳米晶体具有优异的活性,主要归因于以下因素的协同促进作用:首先,具有较高表面能的暴露(001)面促进了反应物分子的活化和光催化氧化;其次,氧空位的增加和(001)表面o2吸附的增强可以捕获光电子,从而抑制它们与空穴的复合;第三,钯纳米粒子的修饰通过捕获光电子有效地降低了光电荷的复合速率。同时,该光催化剂具有很强的Pd- tio2相互作用,可以抵抗Pd浸出或Pd聚集引起的失活。
Pd decorated TiO2nanocrystal with exposed (001) facets was synthesizedviasolvothermal hydrolysis combining photoreduction deposition route, which exhibited a great enhancement in activity and stability of photocatalytic selective alcohol oxidations under UV light irradiation in aqueous medium. The superior activity of Pd decorated TiO2nanocrystal with exposed (001) facets was attributed to the synergistic promoting effects of the following factors: firstly, the exposed (001) facets with higher surface energy facilitated the activation of reactant molecules and the photocatalytic oxidation; secondly, the increased oxygen vacancies and enhanced O2adsorption on (001) facets could trap photoelectrons and thus, inhibit their recombination with holes; thirdly, the decoration with Pd nanoparticles effectively reduce the photocharge recombination rate by capturing photoelectrons. Meanwhile, this photocatalyst displayed excellent durability owning to the strong Pd-TiO2interaction against deactivation caused by either Pd leaching or Pd aggregation.
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