DaiXinyi,YuTian,ZhouQiaoling,et al.Synergistic Mechanism and Degradation Pathways for Levofloxacin Degradation by Tourmaline?modified TiO2[J].China Water & Wastewater,2026,42(13):18-25.
电气石协同TiO2高效降解左氧氟沙星的机制与路径
- Title:
- Synergistic Mechanism and Degradation Pathways for Levofloxacin Degradation by Tourmaline?modified TiO2
- Keywords:
- levofloxacin hydrochloride; photocatalysis; tourmaline; titanium dioxide (TiO2); reaction mechanism
- 摘要:
- 采用溶胶-凝胶法制备了一种新型的电气石改性TiO?复合光催化剂（TMA-Ti），通过光催化降解实验并结合多种表征手段，系统研究了该材料对水中盐酸左氧氟沙星（LVFX）的降解性能和协同作用机制。在LVFX初始浓度为20 mg/L、催化剂投加量为0.25 g/L、吸附光催化一体化反应1 h后，TMA-Ti对LVFX的去除率达62%，效率显著优于TiO2和电气石。复合材料对LVFX的高效降解缘于电气石与TiO2的协同效应，结合淬灭实验结果和中间产物分析，LVFX可能的降解途径包括脱羧、脱氟、C—N键裂解、脱甲基化等，最终被矿化为低分子质量产物、CO2和H2O。TMA-Ti经多次循环使用再生率仍保持在85%以上，证实了电气石改性TiO2复合材料在深度处理难降解抗生素废水方面的应用潜力。
- Abstract:
- A novel tourmaline-modified TiO2 composite (TMA-Ti) was synthesized via the sol-gel method. The performance of TMA-Ti and its synergistic mechanism on levofloxacin hydrochloride (LVFX) degradation in aqueous solution were systematically investigated by experiments and comprehensive characterizations. The results indicated that under the initial LVFX concentration of 20 mg/L, a catalyst dosage of 0.25 g/L, and 1 h integrated adsorption-photocatalysis reaction, a LVFX removal rate of 62% was achieved by the TMA-Ti composite, demonstrating superior performance over pure TiO2 or tourmaline. The enhanced performance of the composite could be attributed to the synergistic effect between tourmaline and TiO2. On the basis of scavenging experiments and intermediate analysis, it was proposed that LVFX degradation occurred through decarboxylation, defluorination, C—N bond cleavage, and demethylation. The process culminated in the mineralization of LVFX to CO2, H2O, and low molecular weight compounds. The TMA-Ti composite maintained a high regeneration rate (>85%) even after multiple reaction cycles, confirming its great potential in the advanced treatment of refractory antibiotic wastewater.
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