Green synthesis of stable structure spindle FeCo-LDH through Fe-MOF template for efficient degradation of 2,4-D

In this work, FeCo-LDH derived from MOF was successfully prepared, which showed excellent catalytic activity for PMS activation and 2,4-D degradation. In the presence of 0.1 g/L FeCo-10 and 1 mM PMS, 2,4-D (10 mg/L) was completely removed within 15 min. Various reactive oxygen species (ROS) were produced in the FeCo-10/ PMS catalytic process. The quenching experiments of MIL-101 and FeCo-10 showed that the dominant role FeCo-10/PMS system was the non-radical effect caused by O-1(2). Using methyl phenyl sulfoxide (PMSO) as chemical probe, we quantitatively evaluated the relative contribution of high-valent iron species in the system, which unfortunately were found to be absent. The degradation pathway of 2,4-D was calculated by GC-MS analysis and Density Functional Theory (DFT). Quantitative structure-activity relationship (QASR) analysis showed that 2,4-D was transformed into the corresponding low-toxic intermediate within 3.0 min. In addition, the structurally stable FeCo-10 showed low levels of metal leaching and preferable 2,4-D degradation reusability. Therefore, the FeCo-10/PMS system may provide new insights into the development of LDH for efficient remediation of organic herbicides in the environment.