Abstract A visible-light-responsive hybrid photocatalyst, K-doped g-C3N4/BiOBr, has been synthesized by K-doped g-C3N4 (K–CN) and BiOBr. The property of photocatalysts was characterized by XRD, FT-IR, TEM, SEM, DRS, PL, EIS and HPLC. The photocatalytic activity of K-doped g-C3N4/BiOBr was evaluated by degradation of Rhodamine B (RhB) and tetracycline hydrochloride under visible-light irradiation. The K-doped g-C3N4/BiOBr hybrid photocatalyst which contains K–CN with mass fraction of 20% (20K–CN/BiOBr) shows the best degradation efficiency of RhB. The degradation efficiency of RhB (20 mg/L) can be achieved to 99% and the degradation efficiency of tetracycline hydrochloride by BiOBr decreased with the increase of K-doped g-C3N4 doping. The results of photocurrent and EIS assumed that the tight coupling between K–CN and BiOBr can enhance the separating efficiency of photo-generated carrier. In addition, the capture experiment proof that h+ is the primary active substance in the system of reaction and ·OH is the auxiliary active substance. After five degradation experiments, the efficiency of the degradation of Rhodamine B by the sample can still reach 90%, which proves that the samples are stable. A new and efficient method is provided in this work to solve the pollution of organic dyes and antibiotics.

中文翻译：

---

可见光响应 K 掺杂的 g-C3N4/BiOBr 杂化光催化剂，可高效降解罗丹明 B 和四环素

摘要 由掺钾 g-C3N4 (K-CN) 和 BiOBr 合成了一种可见光响应混合光催化剂，掺钾 g-C3N4/BiOBr。通过XRD、FT-IR、TEM、SEM、DRS、PL、EIS和HPLC对光催化剂的性质进行了表征。通过在可见光照射下降解罗丹明 B (RhB) 和盐酸四环素来评估 K 掺杂的 g-C3N4/BiOBr 的光催化活性。含有质量分数为 20% 的 K-CN (20K-CN/BiOBr) 的 K 掺杂 g-C3N4/BiOBr 杂化光催化剂显示出最佳的 RhB 降解效率。随着K掺杂g-C3N4掺杂量的增加，RhB(20 mg/L)的降解效率可达99%，BiOBr对盐酸四环素的降解效率降低。光电流和 EIS 的结果假设 K-CN 和 BiOBr 之间的紧密耦合可以提高光生载流子的分离效率。此外，捕获实验证明h+是反应体系中的主要活性物质，·OH是辅助活性物质。经过5次降解实验，样品对罗丹明B的降解效率仍能达到90%，证明样品是稳定的。这项工作为解决有机染料和抗生素的污染提供了一种新的有效方法。样品对罗丹明B的降解效率仍然可以达到90%，证明样品是稳定的。这项工作为解决有机染料和抗生素的污染提供了一种新的有效方法。样品对罗丹明B的降解效率仍然可以达到90%，证明样品是稳定的。这项工作为解决有机染料和抗生素的污染提供了一种新的有效方法。