Photocatalysis-activated SR-AOP over ZIF-NC/PTCDA composites for boosted norfloxacin degradation

Abstract

Zeolitic imidazolate frameworks-8 (ZIF-8) as precursor was calcined at high temperature to prepare N-doped carbon (ZIF-NC). ZIF-NC/PTCDA (PxZy) was fabricated by facile ball milling from the as-prepared ZIF-NC and organic semiconductor 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). The morphology and structure of ZIF-NC and PTCDA were characterized by powder X-ray diffraction (PXRD), fourier transform infrared (FTIR), scanning electron microscopy (SEM), UV-Visible diffuse reflectance spectra (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS), etc. The norfloxacin degradation performance via the photocatalysis-activated sulfate radical-advanced oxidation process (SR-AOP) over PTCDA/ZIF-NC composites with different proportions was studied. The influences of pH value, peroxydisulfate (PDS) dosage and coexisting ions on the norfloxacin degradation over P120Z80 were investigated. After three cycles, the material still maintains good degradation efficiency for norfloxacin. The stability of PTCDA/ZIF-NC was further affirmed by PXRD, FTIR and SEM, etc. Finally, the mechanism of photocatalysis-activated SR-AOP for norfloxacin degradation was proposed, which was clarified by electrochemical tests and active substance capture experiments.

Keywords

• zif-8
• derived carbon material
• 3,4,9,10-perylenetetracarboxylic dianhydride
• sulfate radical (so4·-)
• norfloxacin