College of Food Science and Engineering, Northwest A&F University , Yangling, 712100 Shaanxi, P. R. China.
School of Medicine, Xi'an Jiaotong University , Xi'an, 710061 Shaanxi, P. R. China.
ACS Appl Mater Interfaces. 2017 Sep 27;9(38):32720-32726. doi: 10.1021/acsami.7b08967. Epub 2017 Sep 13.
The selective adsorption by suitable substrate materials is considered one of the most economical methods. In this work, an all-inorganic bimetallic Mo-Fe-S cluster is facilely achieved through in situ chemical fixation of tetrathiomolybdate (TTM) on FeO nanoparticles (NPs) at room temperature (donated as FeMoS NPs). The bimetallic building blocks on the obtained FeMoS NPs possess a monovacancy species of sulfur, endowing FeMoS NPs with a selectivity order of Zn, Mn, Ni < Cd ≪ Cu < Pb for metal-ion adsorption, a novel application for the Mo-Fe-S clusters. Particularly, with the highest selectivity for Pb (K ≈ 10), which is about 3 × 10-1 × 10 times higher than those for other ions and has exceeded that of a series of outstanding sorbents reported for Pb, FeMoS NPs can efficiently reduce the concentration of Pb from ∼10 ppm to an extremely low level of ∼1 ppb. This facile and rational fabrication of the Mo-Fe-S cluster with FeO represents a feasible approach to cheaply develop novel and efficient materials for the selective removal of lead(II).
通过在室温下将四硫代钼酸盐（TTM）原位化学固定在 FeO 纳米颗粒（NPs）上，简便地实现了一种全无机双金属 Mo-Fe-S 簇（记为 FeMoS NPs）。所得 FeMoS NPs 上的双金属结构单元具有硫的单空位物种，使 FeMoS NPs 对金属离子吸附具有选择性顺序 Zn、Mn、Ni < Cd ≪ Cu < Pb，这是 Mo-Fe-S 簇的一种新应用。特别是，对于 Pb（K ≈ 10）的选择性最高，约为其他离子的 3×10-1×10 倍，超过了一系列报道的用于 Pb 的出色吸附剂，FeMoS NPs 可有效地将 Pb 的浓度从约 10 ppm 降低到极低的约 1 ppb。用 FeO 这种简便且合理的方法制备 Mo-Fe-S 簇，为廉价开发用于选择性去除 Pb(II)的新型高效材料提供了一种可行的途径。
