Pt负载暴露(001)晶面Bi2WO6催化剂合成及光催化性能

通过水热法制备了暴露（001）晶面的Bi₂WO₆纳米片，利用光还原法将Pt纳米颗粒负载于其表面.选择苯甲醇氧化和罗丹明B（RhB）降解为探针反应，评价了催化剂的光催化性能.在苯甲醇氧化实验中，Pt负载暴露001晶面的Bi₂WO₆样品的苯甲醇转化率为20.7%，约为未负载样品的2倍.在RhB降解实验中，Pt负载样品在光照40min后对RhB的矿化率可达81.1%，而未负载样品RhB矿化率仅为55.8%，表明Pt负载样品具有更优的降解速率和矿化能力.催化剂性能的提升归因于高能晶面暴露和Pt负载的协同作用.Pt纳米颗粒的负载作为助催化剂增加了催化剂表面的活性位点，同时提高了晶面光生电子空穴对的分离和迁移效率.

Synthesis of Pt loaded Bi2WO6 photocatalysis with exposed (001) facets and its photocatalytic performance

Bi₂WO₆ nanosheets with exposed (001) facets were synthesized via a hydrothermal process, and then Pt nanoparticles were loaded on the surface of the as-synthesized Bi₂WO₆ through photo-reduction method. The photocatalytic performance of the as-prepared photocatalysts was probed by the photocatalytic oxidation of benzyl alcohol and decomposition of rhodamine B (RhB). In terms of the oxidation of benzyl alcohol, the conversion rate over Pt loaded Bi₂WO₆ samples could attain 20.7%, which was about twice that of Bi₂WO₆ without Pt loading. Additionally, the mineralization rate of RhB over the Pt loaded samples (~81.1%) was remarkably higher than that of the photocatalysts without Pt loading (~55.8%) after 40min irradiation. These results collectively demonstrated the superior degradation and mineralization ability of the Pt loaded Bi₂WO₆ nanosheets under irradiation. The boosting photocatalytic activity of the Pt loaded photocatalysts could be attributed to the synergistic effect of Pt loading and the exposure of high energy facets. The loading of Pt nanoparticles, as a cocatalyst, increases the active sites on the surface of the photocatalysts and thereby promotes the separation and migration efficiency of photo-induced electron-hole pairs on the facets.