Rational design of n-Bi12TiO20@p-BiOI core-shell heterojunction for boosting photocatalytic NO removal.
Rational design of n-Bi12TiO20@p-BiOI core-shell heterojunction for boosting photocatalytic NO removal.
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DOI：
10.1016/j.jcis.2021.08.126
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发表时间：
2021-08
影响因子：
9.9
通讯作者：
Hongxia Liu;H. Mei;Shiping Li;L. Pan;Zhipeng Jin;G. Zhu;Lai-fei Cheng;Litong Zhang
中科院分区：
文献类型：
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作者：
Hongxia Liu;H. Mei;Shiping Li;L. Pan;Zhipeng Jin;G. Zhu;Lai-fei Cheng;Litong Zhang
具有独特硅长石结构的钛酸铋（Bi12TiO20）已被证明是一种优异的环境修复光催化剂。然而，狭窄的光响应范围和光生电子空穴的快速复合限制了Bi12TiO20的光催化性能。为了克服这些限制，一种实际可行的方法是将 Bi12TiO20 与合适的光催化剂结合来制备异质结。在此，利用简便的化学沉淀方法，通过在BTO纳米纤维上负载BiOI纳米片，合理设计并合成了n-Bi12TiO20@p-BiOI（BTO@BiOI）异质结的新型分层核壳结构。由于BTO和BiOI之间内置电场的协同效应以及紧密的界面接触，所构建的BTO@BiOI复合材料表现出显着的电荷转移能力。此外，BiOI 的窄带隙特性导致了较宽的光吸收范围。因此，BTO@BiOI异质结在可见光照射下表现出改善的光催化性能。最佳 BTO@BiOI 的 NO 去除效率为 45.7%，明显高于纯 BTO (3.6%) 或 BiOI (23.1%)。此外，循环实验表明BTO@BiOI复合材料具有良好的稳定性和可重复使用性。详细研究了 BTO@BiOI 光催化 NO 氧化的可能机制。
Bismuth titanate (Bi12TiO20) with unique sillenite structure has been shown to be an excellent photocatalyst for environmental remediation. However, the narrow light-responsive range and rapid recombination of photoinduced electrons-holes limit the photocatalytic performance of Bi12TiO20. To overcome the limitations, a practical and feasible way is to fabricate heterojunctions by combining Bi12TiO20with suitable photocatalysts. Here, using a facile chemical precipitation method, a novel and hierarchical core–shell structure of n-Bi12TiO20@p-BiOI (BTO@BiOI) heterojunction was rationally designed and synthesized by loading BiOI nanosheets on BTO nanofibers. The constructed BTO@BiOI composites exhibited significant charge transfer ability due to the synergistic effects of the built-in electric field between BTO and BiOI as well as close interfacial contacts. In addition, the narrow bandgap characteristics of the BiOI led to wide light absorption ranges. Therefore, the BTO@BiOI heterojunction exhibited an improved photocatalytic performance under visible light irradiation. The NO removal efficiency of optimal BTO@BiOI was 45.7%, which was significantly higher compared to that of pure BTO (3.6%) or BiOI (23.1%). Moreover, the cycling experiment revealed that BTO@BiOI composite has a good stability and reusability. The possible mechanism of photocatalytic NO oxidation over BTO@BiOI was investigated in detail.