Abstract

In current study, hierarchical flower-like AgI/Bi₂O₃ heterostructured nanocomposites were fabricated successfully by a glycothermal approach. In the production process, the various conditions such as reaction time and temperature and type of surfactant were investigated, which by optimizing these parameters, uniform flower-like AgI/Bi₂O₃ heterojunction nanostructures were formed. The as-obtained AgI/Bi₂O₃ binary nanocomposites exhibited enhanced visible-light-driven photocatalytic performance towards the desulfurization of dibenzothiophene under mild conditions. Results indicated that the porous flower-like AgI/Bi₂O₃ photocatalyst with suitable energy band gap (2.81 eV), has superior photocatalytic desulfurization efficiency about 93% after 2 h visible light irradiation, even after 5 recycles. The enhanced photocatalytic performance could be attributed to the special architecture and formation of Z-scheme system in the AgI/Bi₂O₃, which results in the efficient separation and transfer of photo-generated charge carriers. Furthermore, the photodesulfurization mechanism was deduced by active species trapping experiments and the results represented that h⁺ and ^·O₂⁻ species played main roles in the photo-oxidation reactions.

中文翻译：

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Z型花状AgI / Bi 2 O 3异质结的制备，在温和条件下具有增强的可见光光催化脱硫

摘要

在当前的研究中，通过糖热方法成功地制备了分层的花状AgI / Bi ₂ O ₃异质结构纳米复合材料。在生产过程中，研究了反应时间，温度和表面活性剂类型等各种条件，通过优化这些参数，形成了均匀的花状AgI / Bi ₂ O ₃异质结纳米结构。所获得的AgI / Bi ₂ O ₃二元纳米复合材料在温和条件下对二苯并噻吩的脱硫表现出增强的可见光驱动的光催化性能。结果表明，多孔花状AgI / Bi ₂ O ₃具有合适的能带隙（2.81 eV）的光催化剂，即使经过5次循环，在可见光照射2 h后仍具有约93％的优异光催化脱硫效率。增强的光催化性能可以归因于AgI / Bi ₂ O ₃中Z方案系统的特殊结构和形成，从而导致光生载流子的有效分离和转移。此外，photodesulfurization机构是由活性种捕获实验推导出的结果表示使得h ⁺和^· ö ₂ ^-在光氧化反应发挥主要作用的物种。