Abstract
We demonstrate the newly prepared magnetite/molybdenum sulfide (Fe3O4/MoS4) composite reacted from protonated Fe3O4 and MoS42– and its highly selective and ultra rapid uptake for Ag+, Pb2+ and Hg2+. The Fe3O4/MoS4 can separate Hg2+, Ag+ and Pb2+ from complex metal mixtures with high selectivity (order is Hg2+>Ag+>Pb2+>>Co2+/Ni2+/Cu2+/Zn2+/Cd2+), which is extremely difficult to do with other materials. The maximum adsorption capacities (qm) for Ag+ and Pb2+ reach up to 546.6 and 101.6 mg/g, respectively, determining an obvious advantage over most known sorbents. Fast sorption kinetics of Pb2+, Hg2+ and Ag+ is found, achieving nearly complete uptake (>99.99%) and very large Kd (106–107 mL/g) within 1–5 min. Sharply reduced concentrations (<1 ppb) of Ag+, Pb2+ and Hg2+ are obtained after sorption in several minutes, meeting safe limit of drinking water. Furthermore, Fe3O4/MoS4 is capable of trapping Ag+/Pb2+ efficiently (>99.9%) over a wide pH range (2.5–7.0 for Ag+, 4.5–6.0 for Pb2+). High loading of MoS42- upon Fe3O4 (MoS4:Fe3O4 molar ratio is 1:2) and strong affinity between material interfaces and metal ions endow the appealing trapping capability and ultrahigh selectivity. Thanks to the ultra fast and outstanding selectivity, the Fe3O4/MoS4 is expected to be one of top materials for removing heavy metals in wastewater.
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