Magnetic field-assisted synthesis and peroxomonosulfate activation performance of Co-zeolite

• Published in: Materials letters 2025-03, Vol.382, p.137944, Article 137944
• Main Authors: Li, Jianjun, Zhang, Bing, Yao, Jun, Wu, Linxin
• Format: Article
• Language: English
• Subjects: Advanced oxidation processes; Magnetic field-assisted synthesis; Nano-Co-zeolite; Peroxomonosulfate
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2024.137944

[Display omitted] •Magnetic field-assisted synthesis of magnetic zeolite composites.•Magnetic field strength affects the structure and morphology of cobalt cover layer.•The magnetic zeolite show high performance for the activation of peroxymonosulfate. A magnetic field-assisted reduction method was employed to synthesize nano-Co-zeolite (NCZ) by controllable loading nanosized cobalt onto zeolite. Careful investigations suggest that the magnetic field applied during the synthesis process has significant influence on the morphology and crystal structure of NCZ. With the increasing of magnetic field, the morphology of the surface-coated cobalt gradually transitioned from irregular, smaller flakes to larger, more uniform flakes with a higher specific surface area, culminating in the formation of a short-chained, alternating stacked nanostructure. The synthesized NCZ samples were used to activate peroxomonosulfate for the catalytic degradation of ciprofloxacin. It is shown that the NCZ synthesized under magnetic field exhibited a much higher catalytic activity compared to those synthesized with no magnetic field, owing to the increase of specific surface area and change of structure of the samples. The highest ciprofloxacin removal of 88.4% was observed in NCZ-100, which was synthesized under 100 mT. Since NCZ has strong magnetism, efficient solid–liquid separation and recycling could be achieved. The catalytic mechanism of NCZ was discussed.