Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China.
Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China.
J Hazard Mater. 2017 Mar 5;325:178-188. doi: 10.1016/j.jhazmat.2016.11.011. Epub 2016 Nov 4.
A functionalized magnetic nickel ferrite/manganese dioxide (NiFeO/MnO) with 3D hierarchical flower-like and core-shell structure was synthesized by a facile hydrothermal approach and applied for the removal of Pb(II) ions from aqueous solutions. Batch adsorption experiments were conducted to study the effect of solution pH, initial Pb(II) concentration, and dose of absorbents on the Pb(II) removal by NiFeO/MnO. The NiFeO/MnO nanocomposites showed the fast Pb(II) adsorption performance with the maximum adsorption capacity of 85.78mgg. The adsorption kinetics of Pb(II) onto NiFeO/MnO obeyed a pseudo-second-order model. The isothermal experimental results indicated that the Langmuir model was fitted better than the Freundlich model, illustrating a monolayer adsorption process for Pb(II) onto NiFeO/MnO. Meanwhile, the NiFeO/MnO was easily separated from the solution by an external magnet within a short period of time and still exhibited almost 80% removal capacity after six regenerations. The NiFeO/MnO is expected to be a new promising adsorbent for heavy metal removal.
一种具有 3D 分级花状和核壳结构的功能化磁性镍铁氧体/二氧化锰（NiFeO/MnO）通过简便的水热法合成，并应用于从水溶液中去除 Pb(II)离子。进行了批量吸附实验，以研究溶液 pH、初始 Pb(II)浓度和吸附剂用量对 NiFeO/MnO 去除 Pb(II)的影响。NiFeO/MnO 纳米复合材料表现出快速的 Pb(II)吸附性能，最大吸附容量为 85.78mgg。Pb(II)在 NiFeO/MnO 上的吸附动力学符合准二级模型。等温实验结果表明，Langmuir 模型比 Freundlich 模型拟合得更好，说明 Pb(II)在 NiFeO/MnO 上的吸附是单层吸附过程。同时，NiFeO/MnO 可以在短时间内通过外部磁铁从溶液中轻易分离出来，并且在经过六次再生后仍然表现出近 80%的去除能力。NiFeO/MnO 有望成为一种用于去除重金属的新型有前途的吸附剂。
