[Degradation of -nitrosodimethylamine by Palladium/ Iron Bimetallic Composite Catalytic Fiber].

-nitrosodimethylamine (NDMA) in the water environment is a carcinogenic organic contaminant, which can be converted to hypotoxic compounds by zero-valent iron degradation. For the removal of trace NDMA in water, the theory and efficiency of zero-valent iron degradation should be intensely researched. In this study, the polypropylene (PP) fibers were chosen as substrate materials and the composite catalyst fibers containing Pd/Fe bimetal were prepared by the UV irradiation-coordination method for the removal of trace NDMA. Pd/Fe/PP-g-AA was characterized by scanning electron microscope, inductively coupled plasma atomic emission spectrometry, and X-ray photoelectron spectroscopy. The NDMA removal by Pd/Fe/PP-g-AA under different conditions was investigated. The results indicated that when the acrylic acid monomer mass fraction was 20%, the composite catalytic fiber Pd/Fe/PP-g-AA showed a better degradation effect on NDMA. The removal of NDMA followed the pseudo-first-order reaction kinetics model. The initial NDMA concentration and the pH of the solution could not greatly influence the catalytic degradation of trace amounts of NDMA. The presence of CO and NO significantly inhibited the degradation of NDMA. However, the NDMA degradation had been less affected by SO, HCO, and nature organic matter (NOM) existing in the solution.