The construction of heterojunctions is a well-established approach for enhancing the photocatalytic efficiency of semiconductor materials. To improve the photocatalytic activity of CO-BiOCO, AgI/CO-BiOCO type-II heterojunction photocatalysts were synthesized using an electrostatic self-assembly method with varying composite ratios. The performance of AgI/CO-BiOCO catalyst was investigated by photocatalytic degradation of 2-Hydroxy-1, 4-naphthoquinone and levofloxacin under a 300 W xenon lamp (λ ≥ 420 nm). The results demonstrated that the composite photocatalyst (0.5ACBOC), prepared by incorporating 0.5 mL of AgNO and KI, exhibited exceptional photocurrent responsiveness and efficient charge carrier separation. 0.5ACBOC displayed the highest degradation efficiency towards 2-Hydroxy-1,4-naphthoquinone (67.5%) and levofloxacin (78.0%). Free radical capture experiments and electron paramagnetic resonance (EPR) analysis revealed ·O as a crucial reactive species in the photodegradation process. Moreover, the photocatalytic degradation of 2-Hydroxy-1,4-naphthoquinone exhibited consistent removal efficiency even after undergoing four cycles, thereby demonstrating the excellent cycle stability of the composite catalyst. These findings highlight that AgI/CO-BiOCO can be easily synthesized and holds great potential as a photocatalyst for efficient degradation of organic pollutants.

中文翻译：

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构建AgI/CO32−Bi2O2CO3 II型异质结增强光催化降解有机污染物

异质结的构建是提高半导体材料光催化效率的一种行之有效的方法。为了提高CO-BiOCO的光催化活性，采用静电自组装方法合成了不同复合比例的AgI/CO-BiOCO II型异质结光催化剂。通过在 300 W 氙灯（λ ≥ 420 nm）下光催化降解 2-Hydroxy-1, 4-萘醌和左氧氟沙星来研究 AgI/CO-BiOCO 催化剂的性能。结果表明，掺入 0.5 mL AgNO 和 KI 制备的复合光催化剂 (0.5ACBOC) 表现出优异的光电流响应能力和有效的载流子分离能力。 0.5ACBOC 对 2-羟基-1,4-萘醌 (67.5%) 和左氧氟沙星 (78.0%) 显示出最高的降解效率。自由基捕获实验和电子顺磁共振（EPR）分析表明·O是光降解过程中的关键活性物质。此外，即使经过四个循环后，2-羟基-1,4-萘醌的光催化降解仍表现出一致的去除效率，从而证明了复合催化剂优异的循环稳定性。这些发现强调AgI/CO-BiOCO可以很容易合成，并且作为有效降解有机污染物的光催化剂具有巨大的潜力。