DNA磁性纳米颗粒对水中菲的吸附性能

多环芳烃(polycyclic aromatic hydrocarbons, PAHs)作为一种致癌污染物，在水体中分布广泛且容易在生物体内富集，对人体健康有着严重的威胁。本研究将DNA与磁性纳米颗粒结合作为吸附剂，利用DNA与多环芳烃化合物的嵌入结合原理去除水体中的菲，分别考察了时间、菲的初始质量浓度、温度等因素对DNA结合菲的影响，以及对DNA磁性纳米颗粒去除菲的影响。结果表明：在35 ℃、pH=7.4、时间为50 min的条件下，在DNA的质量浓度为0.1 mg∙mL⁻¹、菲的初始质量浓度分别为150、200、250 μg∙L⁻¹时，结合率分别为95.47%、93.46%、91.14%。在相同条件下，DNA磁性纳米颗粒用量为1 mg、菲的初始质量浓度分别为100、150、200、250 μg∙L⁻¹时，去除率分别为96.47%、95.61%、93.46%、88.03%，吸附量分别为96、143、187、220 μg∙g⁻¹。DNA磁性纳米颗粒对菲的吸附过程符合准二级动力学模型和Langmuir模型，热力学参数表明吸附过程是自发和吸热的。DNA磁性纳米颗粒作为吸附剂可用于去除污水中的菲，以上研究结果可为基于PAHs-DNA嵌入结合作用处理污水中的菲提供参考。

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.