CNTs/PMS高级氧化体系去除水中的环丙沙星

针对当前抗生素废水处理的难题，以环丙沙星（CIP）为研究对象，采用碳纳米管（CNTs）活化过硫酸氢盐（PMS）对其进行降解。考察了PMS浓度、CIP浓度、CNTs投加量、初始pH等因素对CIP降解效果的影响。研究结果表明，在pH为2.73～11.38范围内，PMS的浓度为1.5mmol/L、CNTs投加量为15mg/L时，初始浓度为5mg/L的CIP降解效果达到最佳，CNTs在反应过程中集吸附和催化于一体，且作为催化剂可实现多次循环利用。借助电子顺磁共振捕获技术和自由基猝灭反应对降解过程中的活性物质进行分析与鉴定，实验结果表明，在整个反应体系中起主导作用的活性基团是硫酸根自由基（SO₄ ^?-）。通过中间产物分析，发现氧化反应主要发生在哌嗪基团、喹诺酮核心的C－F键及环丙烷环上。这些结果可应用于抗生素废水的工业处理。

Degradation of ciprofloxacin by advanced oxidation process with carbon nanotubes/peroxymonosulfate

In view of the current antibiotic wastewater treatment problem, ciprofloxacin, as a selected antibiotic, was degraded with advanced oxidation process by carbon nanotubes (CNTs)-activated peroxymonosulfate (PMS). The effects of PMS dosages, initial CIP concentrations, CNTs dosages and pH on the removal of CIP were investigated. The results showed that under the condition, PMS] = 1.5mmol/L, CNTs]=15mg/L and CIP]=5mg/L, the efficiency of removal CIP could be reached above 90% in the wide pH range of 2.73—11.38. Further, the CNTs had a synergistic effect between adsorption and catalysis in removal of CIP. And the CNTs also showed stable catalytic activity and can be reused as a catalyst for many times. Meanwhile, the active substances in the degradation process were analyzed and identified by means of electron paramagnetic resonance (EPR) capture technology and free radical quenching reaction. The experimental results show that the mechanism of CIP degradation is due mainly to sulfate radicals (SO₄ ^?-). Through the analysis of intermediate products, it was found that the oxidation mainly occurred on the piperazine group, the C-F bond of the quinolone core and the cyclopropane ring. These results can be applied to the industrial process of antibiotics wastewater.