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, 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, China.
J Environ Sci (China). 2025 Mar;149:149-163. doi: 10.1016/j.jes.2023.09.019. Epub 2023 Sep 23.
Developing heterojunction photocatalyst with well-matched interfaces and multiple charge transfer paths is vital to boost carrier separation efficiency for photocatalytic antibiotics removal, but still remains a great challenge. In present work, a new strategy of chloride anion intercalation in BiO via one-pot hydrothermal process is proposed. The as-prepared Ta-BiOCl/BiOCl (TBB) heterojunctions are featured with Ta-BiOCl and Ta-BiOCl lined shoulder-by-shouleder via semi-coherent interfaces. In this TBB heterojunctions, the well-matched semi-coherent interfaces and shoulder-by-shoulder structures provide fast electron transfer and multiple transfer paths, respectively, leading to enhanced visible light response and improved photogenerated charge separation. Meanwhile, a type-II heterojunction for photocharge separation has been obtained, in which photogenerated electrons are drove from the CB (conduction band) of Ta-BiOCl to the both of bilateral empty CB of Ta-BiOCl and gathered on the CB of Ta-BiOCl, while the photogenerated holes are left on the VB (valence band) of Ta-BiOCl, effectively hindering the recombination of photogenerated electron-hole pairs. Furthermore, the separated electrons can effectively activate dissolved oxygen for the generation of reactive oxygen species (·O). Such TBB heterojunctions exhibit remarkably superior photocatalytic degradation activity for tetracycline hydrochloride (TCH) solution to BiO, Ta-BiOCl and Ta-BiOCl. This work not only proposes a Ta-BiOCl/BiOCl shoulder-by-shoulder micro-ribbon architectures with semi-coherent interfaces and successive type-II heterojunction for highly efficient photocatalytic activity, but offers a new insight into the design of highly efficient heterojunction through phase-structure synergistic transformation strategy.
开发具有良好界面匹配和多条电荷转移路径的异质结光催化剂对于提高光催化抗生素去除的载流子分离效率至关重要，但仍然是一个巨大的挑战。在本工作中，提出了一种通过一步水热法在 BiO 中插层氯离子的新策略。所制备的 Ta-BiOCl/BiOCl（TBB）异质结具有 Ta-BiOCl 和 Ta-BiOCl 通过半相干界面肩并肩排列的特点。在这种 TBB 异质结中，良好的半相干界面和肩并肩结构分别提供了快速的电子转移和多条转移路径，从而增强了可见光响应和改善了光生载流子分离。同时，获得了一种用于光电荷分离的 II 型异质结，其中光生电子从 Ta-BiOCl 的 CB（导带）被驱赶到 Ta-BiOCl 的双侧空 CB 上并聚集在 Ta-BiOCl 的 CB 上，而光生空穴则留在 Ta-BiOCl 的 VB（价带）上，有效地抑制了光生电子-空穴对的复合。此外，分离的电子可以有效地激活溶解氧以产生活性氧物种（·O）。与 BiO、Ta-BiOCl 和 Ta-BiOCl 相比，这种 TBB 异质结对盐酸四环素（TCH）溶液表现出显著优越的光催化降解活性。这项工作不仅提出了一种具有半相干界面和连续 II 型异质结的 Ta-BiOCl/BiOCl 肩并肩微带结构，用于高效光催化活性，而且为通过相结构协同转化策略设计高效异质结提供了新的思路。
