Composite material for removing lead ions in solution as well as preparation method and application thereof

Abstract

The invention discloses a composite material for removing lead ions in a solution as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving ammonium molybdate tetrahydrate (NH4) 6Mo7O24.4H2O and thiourea (CN2H4S) into deionized water, and stirring until the ammonium molybdate tetrahydrate (NH4) 6Mo7O24.4H2O and the thiourea (CN2H4S) are completely dissolved; weighing kaolinite, adding the kaolinite into the mixed solution, and mixing and stirring for a certain time to form a uniform suspension; transferring the mixed suspension into a reaction kettle with a polytetrafluoroethylene lining, heating to a target temperature, preserving heat for a certain time, and naturally cooling to room temperature; centrifugally separating a reaction product by adopting a centrifugal machine, and alternately washing with deionized water and absolute ethanol for more than three times; and placing the washed product in a vacuum drying oven at a certain temperature until the sample is completely dried, and grinding to obtain the composite material. The adsorption performance of the composite material on Pb < 2 + > ions in a solution is obviously superior to that of single MoS2 and kaolinite; the maximum adsorption capacity can reach 275.38 mg/g, the 20 min adsorption rate can reach 92% or above, the 50 min adsorption rate can reach 99.9%, and the Pb < 2 + > adsorption rate can be kept higher than 99% or above in a wide pH range.

Description

technical field [0001] The invention belongs to the technical field of mineral materials and environmental protection, and in particular relates to a material for removing lead ions in a solution, a preparation method and application thereof. Background technique [0002] Lead ion is a toxic heavy metal ion, which can accumulate in animals and plants and is difficult to get rid of, causing great harm to the ecological environment and human health. Adsorption, ion exchange, chemical reduction, membrane separation, electrochemical treatment, reverse osmosis and distillation electrodialysis are usually used to remove lead ions in aqueous solution. Among them, the adsorption method is a simple, high-efficiency, and low-cost method, which has great application potential in the removal of lead ions in aqueous solutions. [0003] Yan Chunqiu et al prepared a kind of amidoximated polyacrylonitrile / nylon composite nanofiber membrane (AOPAN / PA-66) by double-nozzle electrospinning tec...

AI Technical Summary

Problems solved by technology

Using cheap kaolinite as the substrate of composite adsorption materials, MoS 2 As a lead ion adsorption monomer, a simple one-step hydrothermal method was used to assemble molybdenum disulfide nanosheets on flaky kaolinite, and a composite adsorption material of kaolinite and molybdenum disulfide was prepared to achieve molybdenum disulfide and high The synergistic adsorption of lingite to lead ions, and the composite adsorption material improves the problem of poor hydrophilicity of single molybdenum disulfide, and has the advantages of good stability, low cost, and wide applicable pH range.

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