In situ synthesis of an advanced Z-scheme Bi/BiOI/black TiO2 heterojunction photocatalysts for efficient visible-light-driven NO purification
In situ synthesis of an advanced Z-scheme Bi/BiOI/black TiO2 heterojunction photocatalysts for efficient visible-light-driven NO purification
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DOI：
10.1016/j.apsusc.2021.150250
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发表时间：
2021-10
影响因子：
6.7
通讯作者：
Qian Li;Jing Hu;Haiqiang Wang;Zhongbiao Wu
中科院分区：
文献类型：
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作者：
Qian Li;Jing Hu;Haiqiang Wang;Zhongbiao Wu
有限的光吸收和严重的电荷复合已被广泛认为是限制P25在NO光催化转化中应用的两个主要障碍。在这项工作中，通过原位固态化学还原方法合成了先进的Bi/BiOI/黑色TiO2异质结光催化剂。黑色二氧化钛将光吸收扩展到整个光谱区域。它与BiOI纳米片构建了直接Z型异质结，不仅促进了电荷分离，而且保留了黑色TiO2中光生空穴的强氧化能力和BiOI中光生电子的强还原能力。因此，当Bi/BiOI/黑色TiO2受到可见光照射时，可以形成更多的·O2-和·OH自由基。此外，引入的Bi金属纳米粒子还可以提高光利用率并作为接受电子的助催化剂。因此，获得了增强的NO光催化氧化活性，最佳样品Bi/BiOI/黑色TiO2表现出约70%的高NO转化效率和约45%的NOx去除率。这项工作可能为异质结光催化剂的设计提供一个令人耳目一新的视角，以实现高效的NO光催化净化和其他光催化应用。
Limited light absorption and severe charge recombination have been widely acknowledged as the two main obstacles restricting the application of P25 in NO photocatalytic conversion. In this work, an advanced heterojunction photocatalyst of Bi/BiOI/black TiO2was synthesized via anin-situsolid-state chemical reduction method. The black TiO2extended the light absorption to the full spectral region. It constructed a direct Z-scheme heterojunction with BiOI nanosheets, not only promoting the charge separation, but also preserving the strong oxidation ability of photogenerated holes in black TiO2and strong reducing ability of photogenerated electrons in BiOI. Thus, more •O2−and •OH radical could form when Bi/BiOI/black TiO2was subjected to visible light irradiation. Besides, the introduced Bi metal nanoparticles could also enhance the light utilization and served as a cocatalyst to accept the electrons. Therefore, enhanced NO photocatalytic oxidation activity was obtained, with the optimal sample Bi/BiOI/black TiO2exhibiting a high NO conversion efficiency of ~70% and NOxremoval of ~45%. This work may provide a refreshing perspective for the design of heterojunction photocatalysts for efficient NO photocatalytic purification and other photocatalytic applications.