In this work, an efficient cage-core peroxymonosulfate (PMS) catalyst was synthesized by applying an electrospinning–calcination process to the cobalt–zeolitic imidazole framework (ZIF-67) crystals for the catalytic degradation of dimethyl phthalate (DMP). The morphology and surface properties of the synthesized materials (ZIF-67, Z600 and ZP400/600/800) were well characterized. ZP600 showed great performance for the catalytic degradation of DMP in the initial pH range of 7.5–10.5. The removal rate of DMP could reach 90.4% in 60 min under optimum dosages of reagents (catalyst = 0.1 g/L, PMS = 0.5 mM, DMP = 6 ppm), and the mineralization degree of contaminant could reach 65%. By quenching experiments, it was determined that sulfate radical (SO4−·) and hydroxyl radical (·OH) dominated the degradation process. Moreover, due to the good magnetism, ZP600 could be easily separated from liquid and showed great reusability in five-cycle reaction experiments. Surprisingly, with the cover of cage-like polyacrylonitrile (PAN) fibers, the cobalt leaching amount of ZP600 decreased by about 87%. This study would expand the application of the electrospinning process in the development of functional materials for water purification.Keywords:elctrospinning;ZIF-67;peroxymonosulfate;cobalt leaching control
Caiping Hu,Haiyin Wang,Bingyan Gao,Lixia Li,Minghui Lv,Bo Zhou,Jianjun Song
Graphical A novel MF@PDA/Co(OH)2 catalyst was fabricated by immobilizing Co(OH)2 on polydopamine (PDA)-functionalized melamine foam. It showed excellent catalytic performance in PMS activation to degrade tetracycline from groundwater, exhibiting minimal cobalt leaching, high stability and reusability. This work provides a scalable SR-AOP solution for antibiotic-polluted wastewater remediation. Antibiotics play a crucial role in modern medicine, yet their improper use has resulted in significant contamination of global groundwater. Advanced oxidation processes (AOPs), especially sulfate radical-based AOPs (SR-AOPs), offer a promising solution by generating strong oxidizing species to degrade persistent organic pollutants. In this study, we developed a novel monolithic cobalt-based catalyst, MF@PDA/Co(OH) 2 , fabricated by immobilizing Co(OH) 2 on polydopamine (PDA)-functionalized melamine foam (MF) through a facile impregnation approach. The PDA modification not only ensures strong Co(OH) 2 adhesion but also minimizes cobalt leaching. Comprehensive characterization confirmed the catalyst's structural integrity, while systematic evaluations demonstrated exceptional stability and reusability in peroxymonosulfate (PMS) activation. Mechanistic investigations revealed a synergistic degradation mechanism involving both radical (•SO 4 − and •OH) and non-radical ( 1 O 2 and electron transfer) pathways for tetracycline removal. This study presents a scalable strategy for developing efficient, cobalt-conserving, and durable catalytic materials, advancing practical SR-AOP applications for antibiotic-contaminated wastewater remediation.
This study prepared the carbon-supported cobalt catalyst (Co-C-X) for activating peroxymonosulfate (PMS), and investigated the effect of co-pyrolysis temperature of graphitic carbon nitride (g-C 3 N 4 ) and vitamin B 12 on the catalytic activity. It was found that with the increase of co-pyrolysis temperature, the catalytic activity of Co-C-X increased, due to the different coordination structures of cobalt. At 500 °C (Co-C-500), cobalt existed as CoO; while it was single atom Co at 600 °C (Co-C-600); and small size CoO at 700 °C (Co-C-700). Co-C-X could activate PMS to produce hydroxyl radicals, sulfate radicals, high-valent cobalt-oxo and singlet oxygen, which depended on the pyrolysis temperature. Although Co-C-700 had the highest catalytic activity, the leaching cobalt was also highest (3.23 mg/L), compared with that of Co-C-500 (0.27 mg/L) and Co-C-600 (0.14 mg/L). Co-C-600 had fast degradation for atrazine, nitrobenzene , bisphenol A, phenol and 4-chlorophenol, which also had wide pH range and high tolerance to inorganic ions.
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