The use of bismuth oxyhalides as photocatalysts has received extensive interest because of their high photocatalytic activity and stability. However, available methods for the synthesis of bismuth oxyhalides with tailored morphologies, well‐defined facets, and tunable band gaps are still lacking. In this work, two‐dimensional BiOCl_xBr_1−x solid solution with exposed {001} facets and tunable band gaps were synthesized by using solvothermal methods. The BiOCl_xBr_1−x solid solution nanoplates crystallized in a homogeneous crystal structure but possessed continuously tuned band gaps from 3.39 to 2.78 eV by decreasing the ratio of Cl/Br. Among the synthesized nanoplates, the BiOCl_0.5Br_0.5 sample exhibited the highest photocatalytic activity for degrading Rhodamine B (RhB), a typical organic pollutant, under visible light. The highest photoactivity of the BiOCl_0.5Br_0.5 sample was attributed to a synergetic effect of higher surface area, facets exposed, and optimized band structure. The results are of profound significance for the design of novel photocatalyst materials.

中文翻译：

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BiOClxBr1-x纳米板固溶体的合成作为带可调带结构的稳健光催化剂

卤氧化铋作为光催化剂的使用因其高的光催化活性和稳定性而受到广泛的关注。但是，仍缺乏合成具有定制形态，明确定义的小面和可调带隙的卤化铋的方法。在这项工作中，使用溶剂热法合成了具有暴露的{001}面和可调带隙的二维BiOCl _x Br _{1- x}固溶体。BiOCl _x Br _1-x固溶体纳米板结晶成均匀的晶体结构，但通过降低Cl / Br的比，能带隙在3.39到2.78 eV之间连续调节。在合成的纳米板中，BiOCl _0.5 Br _0.5样品对可见光下的罗丹明B（RhB）（一种典型的有机污染物）具有最高的光催化活性。BiOCl _0.5 Br _0.5样品的最高光活性归因于较高的表面积，暴露的小面和优化的带结构的协同效应。该结果对新型光催化剂材料的设计具有重要意义。