Mechanistic Study on the Degradation of Norfloxacin by Modified Zero-valent IronMaterials.

ZHOU Man; LU Yao; SUN Chen; GONG Jianyu

In this study, two modified zero-valent iron nanomaterials were prepared by doping with transition metals Cu and Ni, respectively, and the degradation effect and mechanism of the materials on norfloxacin were investigated in both systems with and without citric acid. The results showed that the 1% Cu/Fe0-CA nanoparticles combined with citric acid performed the best degradation effect on norfloxacin, achieving 73% of degradation efficiency in 1 h; in the absence of the citric acid system, norfloxacin also had a 1 h degradation efficiency of about 70%. Combined with DFT theoretical calculation and analysis, further exploration of O2-, H2O2 and OH shows that the absence of citric acid ligand is mainly a reduction degradation process. When Fe0 is converted to Fe2+, electrons are directly transferred to norfloxacin adsorbed on iron surface, and H* also plays a reducing role. In the presence of citric acid ligand, H2O2 is generated in the process of electron transfer, and then Fenton-like reaction with ferrous citrate is produced, reflecting strong oxidation effect.

CITRIC acid; NORFLOXACIN; CITRATES; HABER-Weiss reaction; IRON; TRANSITION metals; CHARGE exchange

Environmental Science & Technology (10036504), 2022, Vol 45, Issue 8, p1

1003-6504

Academic Journal

10.19672/j.cnki.1003-6504.0283.22.338