To effectively enhance the response to visible light, suppress the recombination of electron-hole pairs and enhance the degradation performance towards organic pollutants in water, a novel S-scheme heterojunction Bi₄O₅I₂/In₂O₃ was synthesized by in situ solvothermal loading of Bi₄O₅I₂ on the surface of In₂O₃, and employed to investigate its photocatalytic performance towards doxycycline hydrochloride. The prepared optimal photocatalyst Bi₄O₅I₂/In₂O₃ shows excellent photo-degradation capability under visible light (94.1 %). The transfer pathway of photogenerated carriers in the Bi₄O₅I₂/In₂O₃ heterojunction follows the S-scheme process, demonstrated by various characterizations and Density Functional Theory calculation. The internal electric field formed inside the Bi₄O₅I₂/In₂O₃ S-scheme heterojunction impels the direct transmission of photogenerated carriers from the CB of In₂O₃ to the VB of Bi₄O₅I₂, which produces the accumulation of e^- and h⁺ on the CB of Bi₄O₅I₂ and VB of In₂O₃, severally. Meanwhile, the formed internal electric field reduces the recombination rate of e^-/h⁺. Superoxide and hydroxyl radicals contribute a major role. Degradation pathway was explored and toxicity evaluation of intermediates was also performed. The present results demonstrate that the construction of the Bi₄O₅I₂/In₂O₃ heterojunction can be a feasible route to effectively degrade antibiotic under visible light irradiation.

为了有效增强对可见光的响应，抑制电子空穴对的复合，增强对水中有机污染物的降解性能，原位合成了一种新型S型异质结Bi 4 _O 5 _I 2 _/ In ₂ O ₃ Bi ₄ O ₅ I _{2溶剂热负载在In 2} O ₃表面，并用于研究其对盐酸多西环素的光催化性能。制备的最优光催化剂Bi ₄ O ₅ I ₂ /In ₂ O ₃在可见光下表现出优异的光降解能力（94.1%）。通过各种表征和密度泛函理论计算证明， Bi ₄ O ₅ I ₂ /In ₂ O ₃异质结中光生载流子的传输路径遵循S型过程。_{Bi 4} O ₅ I ₂ /In ₂ O ₃ S型异质结内部形成的内部电场促使光生载流子从In ₂ O _{3的CB直接传输到Bi 4} O ₅ I ₂的VB_{，分别在Bi 4} O ₅ I ₂的CB和In ₂ O _{3的VB上产生e} ^-和h ⁺的积累。同时，形成的内电场降低了e ^- /h ⁺的复合率。超氧化物和羟基自由基发挥了主要作用。探索了降解途径并进行了中间体的毒性评价。_{目前的结果表明，Bi 4} O ₅ I ₂ /In ₂ O ₃的结构异质结可能是可见光照射下有效降解抗生素的可行途径。