Adsorption performance of DNA magnetic nanoparticles to phenanthrene in water
Polycyclic aromatic hydrocarbons(polycyclic aromatic hydrocarbons,PAHs)are carcinogenic pollutants that are widely distributed in water bodies and easily enriched in living organisms,which are detrimental to human health.In the present study,DNA combined with magnetic nanoparticles was used as an adsorbent to remove phenanthrene from wastewater on the basis the principle of embedded binding of DNA with polycyclic aromatic compounds.The effects of time,initial mass concentration of phenanthrene,and temperature on the DNA-bound phenanthrene and phenanthrene removal by DNA magnetic nanoparticles were investigated.The results demonstrated that under the conditions of 35 ℃,pH=7.4,and 50 min,0.1 mg·mL-1 of DNA could lead to the binding rates of 95.47％,93.46％,and 91.14％for phenanthrene with the initial mass concentrations of 150,200,and 250 μg·L-1,respectively.Under the same conditions,1 mg of DNA magnetic nanoparticles could result in the removal rates of 96.47％,95.61％,93.46％,88.03％and the adsorption amounts of 96,143,187,220 μg·g-1 for phenanthrene with the initial mass concentrations of 100,150,200,and 250 μg·L-1,respectively.The adsorption of phenanthrene by DNA magnetic nanoparticles accorded with the pseudo-second-order kinetic model and the Langmuir model.The thermodynamic parameters indicated that the adsorption process was a spontaneous and endothermic one.DNA magnetic nanoparticles as an adsorbent can be used to remove phenanthrene from wastewater.This study can provide a reference for the treatment of phenanthrene in wastewater based on PAHs-DNA embedded binding interaction.
PAHsphenanthreneDNA magnetic nanoparticlesadsorption performance
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