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Ag and TiO2 nanoparticles co-modified defective zeolite TS-1 for improved photocatalytic CO2 reduction
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-09-18 , DOI: 10.1016/j.jhazmat.2020.124019
Yuanyuan Sun , Guohui Li , Yun Gong , Zhenfan Sun , Heliang Yao , Xiaoxia Zhou

Photocatalytic CO2 reduction into fuels has been an attractive research topic. Herein, Ag and TiO2 nanoparticles co-loaded zeolite TS-1 (Ag-TiO2/TS-1) were synthesized by the ion-exchange and subsequently in-situ photodeposition method. The obtained Ag-TiO2/TS-1 sample has a high surface area and rich Ti3+-Vo defects and as well as highly dispersed Ag nanoparticles. As expected, the sample Ag-TiO2/TS-1 not only shows high CO2 adsorption capacity, but also improves the separation efficiency of photogenerated electron-hole pairs. As a result, only CO and CH4 can be detected on the sample Ag-TiO2/TS-1 in the photocatalytic CO2 conversion, and the competing H2 evolution can be completely suppressed, suggestive of its high selectivity. The super photocatalytic activity toward CO2 reduction can be ascribed to the synergistic effect among highly dispersed Ag nanoparticle, the support zeolite TS-1 and TiO2 with highly exposed {101} planes.



中文翻译:

Ag和TiO 2纳米粒子共改性有缺陷的TS-1型沸石以改善光催化还原CO 2的能力

光催化将CO 2还原为燃料一直是一个有吸引力的研究主题。在此,通过离子交换和随后的原位光沉积法合成了负载有TS-1沸石的Ag和TiO 2纳米颗粒(Ag-TiO 2 / TS-1)。所得的Ag-TiO 2 / TS-1样品具有高的表面积和丰富的Ti 3+ -V o缺陷以及高度分散的Ag纳米颗粒。不出所料,样品Ag-TiO 2 / TS-1不仅显示出高的CO 2吸附能力,而且提高了光生电子-空穴对的分离效率。结果,在样品Ag-TiO 2上只能检测到CO和CH 4。/ TS-1在光催化CO 2转化中以及竞争性H 2的释放可以被完全抑制,这表明它具有很高的选择性。对CO 2还原的超光催化活性可以归因于高度分散的Ag纳米颗粒,具有高度暴露的{101}面的载体沸石TS-1和TiO 2之间的协同作用。

更新日期:2020-09-20
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