BiOIO₃/BiOI/Bi₂S₃ (BBS-x) heterostructure composites are first synthesized via in situ reduction and chemical deposition. The BiOIO₃/BiOI/Bi₂S₃ composites integrate the merits of BiOI and Bi₂S₃, with a widened light response range and improved light absorbance ability, as confirmed by the DRS test. The close type-Ⅱ interface along with carrier migrate and transfer mechanism can spatially isolate photoinduced e^- and h⁺, hinder the recombination of photogenerated carriers and boost their efficiency transfer and separation, as proven by scanning electron microscopy, transmission electron microscopy, electrochemical impedance spectroscopy, transient photocurrent response, and photoluminescence. These properties enhance the photocatalytic activity of BiOIO₃/BiOI/Bi₂S₃ composites when applied to the photodegradation of rhodamine B, regardless of their irradiation with simulated solar light or LED light. The BBS-0.75 composite has the highest apparent rate constant k (0.034 min⁻¹) under simulated solar light irradiation, which is approximately 4.5 times greater than that of pure BiOIO₃ (0.0076 min⁻¹). The BBS-0.75 composite almost completely photodegrades RhB within 30 min under LED light irradiation. Free radical scavenging experiments reveal that •O₂^- and h⁺ are the main reactive species. Thus, a logical type-II carrier transfer mechanism with dye sensitization is proposed.

BiOIO ₃ /BiOI/Bi ₂ S ₃ (BBS-x)异质结构复合材料首先通过原位还原和化学沉积合成。正如 DRS 测试所证实的，BiOIO ₃ /BiOI/Bi ₂ S ₃复合材料结合了 BiOI 和 Bi ₂ S ₃的优点，具有更宽的光响应范围和改进的光吸收能力。紧密的Ⅱ型界面以及载流子迁移和转移机制可以在空间上隔离光致 e ^-和 h ⁺, 阻碍光生载流子的重组并提高其转移和分离的效率，正如扫描电子显微镜、透射电子显微镜、电化学阻抗谱、瞬态光电流响应和光致发光所证明的那样。当应用于光降解罗丹明 B 时，这些特性增强了 BiOIO ₃ /BiOI/Bi ₂ S ₃复合材料的光催化活性，无论它们受到模拟太阳光或 LED 光的照射。BBS-0.75 复合材料在模拟太阳光照射下具有最高的表观速率常数k (0.034 min ^-1 )，大约是纯 BiOIO ₃ ( 0.0076 min ^-1 ) 的 4.5 倍^-1 )。在 LED 光照射下，BBS-0.75 复合材料在 30 分钟内几乎完全光降解 RhB。自由基清除实验表明•O ₂ ^-和h ⁺是主要的活性物种。因此，提出了一种具有染料敏化的逻辑 II 型载流子转移机制。