In this study, the degradation of antibiotic ciprofloxacin (CIP) over Bi₂O₃/(BiO)₂CO₃ heterojunctions under simulated solar light irradiation (SSL-Bi₂O₃/(BiO)₂CO₃) was examined for the first time. The results showed that the Bi₂O₃/(BiO)₂CO₃ heterojunctions dramatically improved CIP decay efficiency. The effect of parameters showed that the CIP decay was optimized with the Bi₂O₃/(BiO)₂CO₃ dosage of 0.5 g/L and a wide pH range of 4.0–8.3, based on which, a kinetic model was derived to predict the remaining CIP concentration. It was found that the presence of anions like SO₄²⁻, NO₃⁻ and HCO₃⁻ decelerated the CIP decay, while the co-existence of Cl⁻ accelerated the CIP decay. Six degradation intermediates were identified by ultra-performance liquid chromatography coupled with mass analyzer (UPLC/MS) and ion chromatographic (IC) analysis, and the decay pathways and degradation mechanism of CIP were proposed by combining the experiment data with theoretical calculation of frontier electron densities. Hydroxyl radical’s reaction, photo-hole (h⁺) oxidation and reductive defluorination were found to involve in the CIP decay. The efficient alleviation on total organic carbon (TOC) and toxicity indicated that the complete mineralization and de-toxicity are possible by this system with sufficient reaction time.

在这项研究中，首先研究了在模拟太阳光辐照下（SSL-Bi ₂ O ₃ /（BiO）₂ CO ₃）Bi ₂ O ₃ /（BiO）₂ CO ₃异质结上抗生素环丙沙星（CIP）的降解。时间。结果表明，Bi ₂ O ₃ /（BiO）₂ CO ₃异质结大大提高了CIP衰减效率。参数的影响表明，使用Bi ₂ O ₃ /（BiO）₂ CO _3可优化CIP衰减。剂量为0.5 g / L，pH范围为4.0–8.3，可根据此动力学模型预测剩余的CIP浓度。已经发现，阴离子的存在喜欢SO ₄ ^2-，NO ₃ ^-和HCO ₃ ^-减速的CIP衰变，而Cl组成的共存^-加速了CIP衰变。通过超高效液相色谱，质谱分析仪（UPLC / MS）和离子色谱（IC）分析，鉴定了6种降解中间体，并结合实验数据和前沿电子理论计算，提出了CIP的降解途径和降解机理。密度。羟基自由基反应，光洞（h ⁺）氧化和还原性脱氟被发现与CIP衰减有关。有效减少总有机碳（TOC）和毒性表明，该系统具有足够的反应时间，可以实现完全的矿化和脱毒。