High-Efficiency Extraction of Methylnaphthalene and Acenaphthene in Farmland Water Using Magnetic Porous Carbon Spheres Derived from Nickel Decorated Phenolic Resin

In this study, carbon spheres decorated with nickel nanoparticles (ACS@Ni NPs) were prepared through arginine-assisted hydrothermal treatment, followed by high-temperature carbonization in a nitrogen atmosphere. ACS@Ni NPs displayed uniform size and excellent monodispersity. The specific surface area increased from 9.03 m 2 /g to 428.69 m 2 /g after carbonization. The ACS@Ni NPs were employed as adsorbents in dispersive magnetic solid phase extraction (d-MSPE) to extract methylnaphthalene and acenaphthene. The adsorption capacities of ACS@Ni NPs for methylnaphthalene and acenaphthene were 1592.75 μg g −1 and 1652.83 μg g −1 , respectively. In addition, ACS@Ni NPs sustained adsorption efficiencies > 90% even after ten reuse times. Coupled with high-performance liquid chromatography-ultraviolet detection technology, under the optimum experimental conditions, the detection limits of methylnaphthalene and acenaphthene were 0.58 and 0.12 ng mL −1 . The recoveries of methylnaphthalene and acenaphthene in all samples remained > 95%, with relative standard deviations < 4.5%. The results indicated that ACS@Ni NPs could be applied in environmental pollution treatment and sample preparation.