Engineering Research Center of Conducting Materials and Composite Technology, Ministry of Education, Shaanxi Engineering Research Center of Metal-Based Heterogeneous Materials and Advanced Manufacturing Technology, Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, 710048, Shaanxi, People's Republic of China.
Engineering Research Center of Conducting Materials and Composite Technology, Ministry of Education, Shaanxi Engineering Research Center of Metal-Based Heterogeneous Materials and Advanced Manufacturing Technology, Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, 710048, Shaanxi, People's Republic of China.
Chemosphere. 2022 Nov;307(Pt 3):135979. doi: 10.1016/j.chemosphere.2022.135979. Epub 2022 Aug 14.
Bismuth oxychloride (BiOCl) has appeared as a popular candidate in photocatalysis field but is plagued by its poor visible light harvesting and low carriers-flow steering inherited from wide band gap. Integration of doping and heterojunction engineering into the bulk has proven to be an optimal and generally applied method for enabling excellent photocatalytic activity. Nevertheless, the previous reported BiOCl-based photocatalysts fabricated by the above strategies are still suffered from harsh synthesis process, poor interface stability and narrow application area. Here, we introduce a facile one-pot hydrothermal strategy to achieve in-situ growth of TaON as a medium on the surface of BiO and S-doped BiOCl (denoted as S-BiOCl) for constructing ternary TaON/BiO/S-BiOCl heterostructures, which were obtained by the simultaneous coprecipitation and ripening process. Current investigation suggests that such a unique TaON/BiO/S-BiOCl exhibits a relatively much higher photocatalytic activity for visible light-driven removal of rhodamine B (RhB), tetracycline (TC) and tetracycline hydrochloride (TC-HCl) than those of hybrid BiO/S-BiOCl and pristine S-BiOCl. It is ascribed to the synergetic effect on the introduction of S dopant level in BiOCl lattice as well as the construction of intimate double heterointerfaces among BiO, TaON and S-BiOCl, which endows the TaON/BiO/S-BiOCl photocatalysts with considerable advantages for highly elevating photocatalytic performances, such as the intensive optical absorption, high redox potential as well as high-efficient photocharge separation originated from type-I and Z-scheme pathways. This work delivers novel insights for design and one-pot preparation of high-active BiOX (X = Cl, Br and I)-based photocatalysts towards organic dye and antibiotic removal in the future research.
三氧化二铋 (BiOCl) 作为光催化领域的一种很有前途的候选材料，但其宽禁带带来的可见光捕获能力差和载流子迁移率低的问题一直困扰着其发展。将掺杂和异质结工程整合到块状材料中已被证明是一种优化且广泛应用的方法，可以实现优异的光催化活性。然而，以前报道的通过上述策略制备的基于 BiOCl 的光催化剂仍然存在苛刻的合成工艺、较差的界面稳定性和较窄的应用范围等问题。在此，我们介绍了一种简便的一步水热策略，通过共沉淀和熟化过程在 BiO 和 S 掺杂的 BiOCl（记为 S-BiOCl）表面原位生长 TaON 作为介质，构建了三元 TaON/BiO/S-BiOCl 异质结构。研究表明，这种独特的 TaON/BiO/S-BiOCl 在可见光驱动下对罗丹明 B（RhB）、四环素（TC）和盐酸四环素（TC-HCl）的去除具有相对较高的光催化活性，优于混合 BiO/S-BiOCl 和原始 S-BiOCl。这归因于 S 掺杂剂在 BiOCl 晶格中的引入以及 BiO、TaON 和 S-BiOCl 之间紧密的双异质结的构建所产生的协同效应，使 TaON/BiO/S-BiOCl 光催化剂具有显著提高光催化性能的优势，例如源自 I 型和 Z 型途径的强光学吸收、高氧化还原电位和高效光电荷分离。这项工作为未来研究中用于去除有机染料和抗生素的高效 BiOX（X = Cl、Br 和 I）基光催化剂的设计和一锅法制备提供了新的思路。
