Abstract：
Due to the frequent detection and potential toxicity of moxifloxacin (MOX), its removal technology had attracted attention in recent years. In this research, CuFeS2/MXene was prepared and used to activate peroxymonosulfate (PMS) to remove MOX. The degradation efficiencies, kinetics, influences, and reaction mechanism of MOX by CuFeS2/MXene/PMS were investigated. The synergistic effect of CuFeS2 and MXene significantly enhanced PMS activation, producing SO4•-, HO•, and 1O2 as the main active species. By adding 0.12 g/L CuFeS2/MXene and 0.12 mM PMS, MOX removal efficiency reached 99.1% within 40 min, with a rate constant of 0.1073 min-1. The composite ratios of CuFeS2/MXene impacted PMS activation more significantly than catalyst dosages and PMS concentrations. Acidic conditions were favorable for the degradation of MOX, while HCO3-, HPO42-, Mn2+, and HA had the inhibitory effects. Twelve major products were detected by HPLC-MS, and DFT was used to illustrate possible degradation pathways of MOX, including the removal of nitrogen-containing heterocycle and transformations of quinolone moieties. Toxicity analysis showed that the developmental toxicity, mutagenicity, and acute toxicity of degradation products tended to decrease. CuFeS2/MXene could exhibit excellent reusability, maintaining an average MOX degradation efficiency of 90.8% in the 7-cycle experiments.
摘要：
由于莫西沙星（MOX）的频繁检测和潜在毒性，它的去除技术近年来引起了人们的关注。在这项研究中,制备CuFeS2/MXene并用于活化过氧单硫酸盐(PMS)以去除MOX。降解效率，动力学,影响力，研究了CuFeS2/MXene/PMS对MOX的反应机理。CuFeS2和MXene的协同作用显著增强了PMS的活化,产生SO4·-，HO•,以1O2为主要活性物种。通过添加0.12g/LCuFeS2/MXene和0.12mMPMS，40min内MOX去除率达到99.1%,速率常数为0.1073min-1。CuFeS2/MXene的复合比率比催化剂剂量和PMS浓度更显著地影响PMS活化。酸性条件有利于MOX的降解,而HCO3-，HPO42-,Mn2+,和HA有抑制作用。通过HPLC-MS检测12种主要产物,DFT用于说明MOX可能的降解途径，包括含氮杂环的去除和喹诺酮部分的转化。毒性分析表明，发育毒性，致突变性,降解产物的急性毒性有降低的趋势。CuFeS2/MXene可以表现出优异的可重用性，在7个循环实验中保持平均MOX降解效率为90.8%。
