Although Bi-based compounds are effective photocatalysts for degrading organic pollutants under visible-light irradiation, their visible-light photocatalytic activities are still low and far from practical application. In this study, novel graphene-functionalized Bi-bridge Z-scheme black BiOCl/Bi₂O₃ (black BiOCl-Bi-Bi₂O₃/rGO) heterojunctions with oxygen vacancies were prepared via in situ Fe reduction of BiOCl/graphene oxide nanoplates. In comparison with BiOCl/graphene oxide nanoplates, the black BiOCl-Bi-Bi₂O₃/rGO heterojunctions have stronger visible-light absorption, and exhibit more efficient charge separation and higher visible-light photocatalytic activity in degrading 2-nitrophenol (2NP). The black BiOCl-Bi-Bi₂O₃/rGO_0.4 shows the highest visible-light photocatalytic activity with almost complete degradation of 2NP, which is attributed to proper bandgap match between black BiOCl and Bi₂O₃, multiple charge transfer channels via Bi-bridge and rGO, and efficient charge separation. Of special importance, black BiOCl-Bi-Bi₂O₃/rGO heterojunction can effectively treat real industrial wastewater with 70.3% COD removal efficiency, and it shows superior long-term stability. Additionally, a possible photocatalytic mechanism of black BiOCl-Bi-Bi₂O₃/rGO heterojunctions based on multiple charge transfer channels was proposed.

尽管Bi基化合物是在可见光照射下降解有机污染物的有效光催化剂，但是它们的可见光光催化活性仍然很低，与实际应用相去甚远。在这项研究中，通过BiOCl /氧化石墨烯的原位Fe还原，制备了具有氧空位的新型石墨烯官能化双桥Z方案黑色BiOCl / Bi ₂ O ₃（黑色BiOCl-Bi-Bi ₂ O ₃ / rGO）异质结。纳米板。与BiOCl /氧化石墨烯纳米板相比，黑色的BiOCl-Bi-Bi ₂ O ₃/ rGO异质结在降解2-硝基苯酚（2NP）时具有更强的可见光吸收能力，并表现出更有效的电荷分离和更高的可见光光催化活性。黑色BiOCl-Bi-Bi ₂ O ₃ / rGO _0.4表现出最高的可见光光催化活性，几乎完全降解2NP，这归因于黑色BiOCl和Bi ₂ O ₃之间的带隙匹配正确，多个通过Bi的电荷转移通道-电桥和rGO，以及高效的电荷分离。黑色BiOCl-Bi-Bi ₂ O ₃特别重要/ rGO异质结可有效处理实际工业废水，COD去除率达70.3％，并且具有出色的长期稳定性。此外，提出了一种基于多个电荷转移通道的黑色BiOCl-Bi-Bi ₂ O ₃ / rGO异质结的可能的光催化机理。