Enhanced heterogeneous catalytic ozonation to degrade p-nitrophenol by Co-doped Ni3S2/NF nanosheets

In this study, a cobalt-doped nickel disulfide (Co-Ni 3 S 2 ) catalyst was prepared by a one-step hydrothermal method, which was grown on the surface of firm and dense three-dimensional porous nickel foam (NF). Although researchers have conducted extensive research on heterogeneous catalytic ozonation (HCO) over the past decades, the development of highly efficient, easily separable, stable, and recyclable HCO catalysts is still a bottleneck for practical applications. Taking p-nitrophenol (PNP) as the targeted pollutant, the synergistic effect of Co-Ni 3 S 2 /NF composites and ozone was studied. The results show that Co-Ni 3 S 2 /NF with different doping ratios can degrade PNP by more than 99% within 40 minutes, showing high activity. At the same time, in the cycle experiment, Co-Ni 3 S 2 /NF showed good stability and recyclability compared with the powder catalyst and therefore, the former could reduce water treatment cost. We also found that in the Co-Ni 3 S 2 /NF/O 3 system, the production rates of 1 O 2 , •OH and O 2 •- can be greatly improved, and the process of degradation is synergistic with both non-radicals and free radicals.