Abstract

Strategies of bridging electronic transmission channel have been widely applied in photocatalyst design to optimize the charge transportation processes. However, the contact area and interfacial interaction between two catalysts still required to be enlarged and strengthened to further improve that process. In this work, two-dimensional Bi₂O₂CO₃/BiOCl composites were fabricated through a facile chemical method at room temperature. According to the photocatalytic activity evaluations, the optimized Bi₂O₂CO₃/BiOCl composite exhibited excellent activity and achieved complete degradation of Rhodamine B (RhB) within 5 min while only 52% was degraded by Bi₂O₂CO₃ in 25 min under visible light irradiation. The mechanism of enhanced activity were investigated and discussed in detail which can be attributed to two aspects. First, the matched band structure of Bi₂O₂CO₃/BiOCl heterojunction provided new pathway for photo-induced electrons, which produced superoxide radical (·O₂⁻) and hydroxyl radical (·OH) for degradation of RhB. Second, the in situ-formed BiOCl has strong cohesion with {001} facet of Bi₂O₂CO₃ thus generating the stacked sandwich structure. This structure provided carriers with long lifetime with the assistance of electronic transmission channel formed between Bi₂O₂CO₃ and BiOCl as well as a larger contact area. As a result, the interfacial charge recombination was efficiently suppressed. With these two factors, the visible-light-induced RhB degradation of Bi₂O₂CO₃/BiOCl was promoted. This work provided an effective strategy for photocatalyst design. And the low cost and facile fabrication strategy also offered a promising potential of Bi-based catalyst in photocatalytic application.

中文翻译：

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通过内聚高效电子传输通道在二维Bi 2 O 2 CO 3 / BiOCl异质结上具有高可见光若丹明B降解活性

摘要

桥接电子传输通道的策略已广泛应用于光催化剂设计中，以优化电荷传输过程。然而，仍然需要扩大和加强两种催化剂之间的接触面积和界面相互作用，以进一步改进该方法。在这项工作中，二维Bi ₂ O ₂ CO ₃ / BiOCl复合材料是通过一种简便的化学方法在室温下制备的。根据光催化活性评估，优化的Bi ₂ O ₂ CO ₃ / BiOCl复合材料表现出优异的活性，并在5分钟内实现了罗丹明B（RhB）的完全降解，而Bi ₂ O仅降解了52％在可见光照射下，在25分钟内₂ CO ₃。研究和讨论了增强活动的机制，这可以归因于两个方面。首先，Bi的匹配带结构₂ ö ₂ CO ₃ /的BiOCl异质结提供了一种用于光诱导的电子新途径，其产生的超氧阴离子自由基（·O2 ₂ ^- ）和羟基自由基（·OH）为罗丹明B的降解。其次，原位形成的BiOCl与Bi ₂ O ₂ CO _3的{001}面具有很强的内聚力从而产生堆叠的三明治结构。这种结构借助于在Bi ₂ O ₂ CO ₃和BiOCl之间形成的电子传输通道以及更长的接触面积而为载流子提供了长寿命。结果，有效地抑制了界面电荷的复合。利用这两个因素，促进了Bi ₂ O ₂ CO ₃ / BiOCl的可见光诱导的RhB降解。这项工作为光催化剂设计提供了有效的策略。低成本，简便的制备策略也为Bi-基催化剂在光催化领域的应用提供了广阔的前景。