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

A technology of composite materials and lead ions, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of poor hydrophilicity of molybdenum disulfide, etc., to improve poor hydrophilicity and high cost , the effect of low synthesis cost

Pending Publication Date: 2020-11-13
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1.24g of ammonium molybdate tetrahydrate and 1.07g of thiourea to dissolve in 60mL of deionized water, stir with a magnetic stirrer until completely dissolved; weigh 1g of kaolinite into the mixed solution, mix and stir for 30min to form a uniform suspension liquid; transfer the mixed suspension into a polytetrafluoroethylene-lined reaction kettle, raise the temperature to 210°C for 6 hours, and then naturally cool to room temperature; use a centrifuge to centrifuge the reaction product, and use deionized water and absolute ethanol alternately Wash the product more than three times; the washed product is placed in a vacuum drying oven at 80°C until the sample is completely dry, and it is ground for later use, code-named SK@MoS 2 .

[0031] figure 1 For the synthesis of SK@MoS in this example 2 The XRD pattern of the composite material. It can be seen from the figure that in addition to the characteristic diffraction peaks of the kaolinite substrate, the XRD pat...

Embodiment 2

[0033] Weigh 2.48g of ammonium molybdate tetrahydrate and 2.14g of thiourea to dissolve in 60mL of deionized water, stir with a magnetic stirrer until completely dissolved; weigh 2g of kaolinite into the mixed solution, mix and stir for 30min to form a uniform suspension liquid; transfer the mixed suspension into a polytetrafluoroethylene-lined reaction kettle, raise the temperature to 220 ° C for 8 hours, and then naturally cool to room temperature; use a centrifuge to centrifuge the reaction product, and use deionized water and absolute ethanol alternately The product was washed more than three times; the washed product was placed in a vacuum drying oven at 80°C until the sample was completely dried, and ground for XRD testing.

[0034] image 3 For the synthesis of SK@MoS under the conditions of this example2 The XRD pattern of the composite material, it can be seen from the figure that the characteristic diffraction peaks of kaolinite and molybdenum disulfide appear on the...

Embodiment 3

[0036] To compare SK@MoS 2 Composite adsorption materials and single MoS 2 and kaolinite on Pb 2+ difference in adsorption performance. in Pb 2 + Add 0.08g of SK@MoS to the solution with concentration of 100mg / L, pH of 4.0 and volume of 50mL 2 、MoS 2 and kaolinite samples were placed on a magnetic stirrer and stirred for 10min, 20min, 30min, 40min, 50min, and 60min, respectively, and then removed, and a centrifuge was used for solid-liquid separation to obtain supernatant and solid samples. Pb in the supernatant 2+ Concentration is detected to get Pb 2+ Concentration, using the residual method to calculate the effect of three adsorbents on Pb under different stirring time conditions 2+ the adsorption rate.

[0037] Figure 4 SK@MoS under different stirring time conditions in this example 2 、MoS 2 and kaolinite to Pb 2+ The graph of adsorption rate shows that when the stirring time is 10min, 20min, 30min, 40min, 50min, 60min, the 2 to Pb 2 + The adsorption rates ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12C02F1/28B01J20/30C02F101/20
CPCB01J20/12B01J20/0218B01J20/0285C02F1/281C02F2101/20
Inventor 匡敬忠原伟泉黄哲誉王笑圆张绍彦肖俊杰
Owner JIANGXI UNIV OF SCI & TECH
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