Novel ternary nanohybrids, bifunctionalized graphene oxide/MnFe₂O₄ magnetic nanoparticles (PEHA-Phos-GO/MnFe₂O₄), were prepared by a facile method and applied for the removal of Pb(II) from aqueous solution. Attributing to the numerous amino and phosphate groups on the bifunctionalized GO nanosheets as well as the magnetic nanoparticles of MnFe₂O₄, PEHA-Phos-GO/MnFe₂O₄ demonstrated high removal efficiency of Pb(II) and rapid magnetic separation. The 366.4 mg/g maximum adsorption capacity of Pb(II) on PEHA-Phos-GO/MnFe₂O₄ was obtained at the optimal adsorption pH of 5.5, much higher than that on GO (212.1 mg/g). The kinetics and isotherm data indicated that the adsorption processes can be well described by the pseudo-second-order kinetics and the Langmuir model. For the adsorption of Pb(II) on PEHA-Phos-GO/MnFe₂O₄, thermodynamic studies revealed the endothermic nature of the spontaneous adsorption process. The exhibited adsorption capacity, easy magnetic separation and reusability make the PEHA-Phos-GO/MnFe₂O₄ nanohybrids very promising adsorbents for efficacious removal of heavy metals from aqueous solutions in environmental pollution cleanup.

通过一种简便的方法制备了新型三元纳米杂化物，即双功能氧化石墨烯/ MnFe ₂ O ₄磁性纳米粒子（PEHA-Phos-GO / MnFe ₂ O ₄），并将其用于从水溶液中去除Pb（II）。PEHA-Phos-GO / MnFe ₂ O ₄归因于双官能化GO纳米片以及MnFe ₂ O ₄的磁性纳米粒子上的大量氨基和磷酸基团，显示出Pb（II）的高去除效率和快速的磁性分离。在PEHA-Phos-GO / MnFe ₂ O ₄上Pb（II）的最大吸附容量为366.4 mg / g在5.5的最佳吸附pH值下获得的四氢呋喃比GO（212.1 mg / g）高得多。动力学和等温线数据表明，吸附过程可以通过拟二级动力学和Langmuir模型很好地描述。对于PEb-Phos-GO / MnFe ₂ O ₄上的Pb（II）吸附，热力学研究揭示了自发吸附过程的吸热性质。PEHA-Phos-GO / MnFe ₂ O ₄纳米杂化物具有良好的吸附能力，易磁分离性和可重复使用性，非常有希望在环境污染净化中有效去除水溶液中的重金属。