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In-Situ Fixation of All-Inorganic Mo–Fe–S Clusters for the Highly Selective Removal of Lead(II)
journal contribution
posted on 2017-09-05, 00:00 authored by Wentao Zhang, Shuo Shi, Wenxin Zhu, Chengyuan Yang, Sihang Li, Xinnan Liu, Na Hu, Lunjie Huang, Rong Wang, Yourui Suo, Zhonghong Li, Jianlong WangThe 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 Fe3O4 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 Zn2+, Mn2+, Ni2+ < Cd2+ ≪
Cu2+ < Pb2+ for metal-ion adsorption, a novel
application for the Mo–Fe–S clusters. Particularly,
with the highest selectivity for Pb2+ (Kd ≈ 107), which is about 3 × 103–1 × 106 times higher than those for
other ions and has exceeded that of a series of outstanding sorbents
reported for Pb2+, FeMoS NPs can efficiently reduce the
concentration of Pb2+ from ∼10 ppm to an extremely
low level of ∼1 ppb. This facile and rational fabrication of
the Mo–Fe–S cluster with Fe3O4 represents a feasible approach to cheaply develop novel and efficient
materials for the selective removal of lead(II).