Preparation method and application of nano zero-valent iron composite material

A technology of nano-zero-valent iron and composite materials, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve problems affecting the adsorption efficiency of nano-zero-valent iron particles, and achieve improved capacity, Good dispersibility and uniform particle effect

Pending Publication Date: 2018-12-04
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of agglomeration of zero-valent nano-iron particles, polymers or surfactants are usually used as stabilizers to reduce the degree of agglomeration of zero-valent nano-iron particles, but the use of these polymers or surfactants often affects the quality of nano-zero-valent iron particles. Adsorption Efficiency of Particles

Method used

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  • Preparation method and application of nano zero-valent iron composite material
  • Preparation method and application of nano zero-valent iron composite material
  • Preparation method and application of nano zero-valent iron composite material

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preparation example Construction

[0038] The invention provides a preparation method of a nanometer zero-valent iron composite material, comprising: S1) in a protective atmosphere, mixing a carrier with an iron salt solution to obtain a carrier iron salt suspension; S2) in a protective atmosphere, mixing the After the carrier iron salt suspension is mixed and reacted with the sunflower leaf extract, the nanometer zero-valent iron composite material is obtained.

[0039] Wherein, the present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0040] The carrier can be an inorganic carrier well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably one or more of bentonite, activated carbon, expanded graphite and calcium carbonate, more preferably bentonite. The use of bentonite as a carrier is based on the fact that natural bentonite materials are rich in reserves, easy to obtain, ...

Embodiment 1

[0050] 1.1 Preparation of sunflower leaf extract

[0051] Weigh 200 g of fresh sunflower leaves and add 1000 mL of deionized water, heat in a water bath at 80° C. for 2 h, cool to room temperature and vacuum filter to obtain sunflower leaf extract.

[0052] 1.2 Preparation of iron salt solution

[0053] An appropriate amount of ferrous sulfate was dissolved in a mixture of absolute ethanol and deionized water with a volume ratio of 7:3 to prepare an iron salt solution with a concentration of 0.05 mol / L.

[0054] 1.3 Preparation of bentonite iron salt suspension

[0055] Add an appropriate amount of bentonite to the above-mentioned iron salt solution, wherein the mass ratio of bentonite to iron element in the iron salt solution is 2:1, and fully stir with an electric stirrer at a speed of 800r / min for 6 hours to prepare a bentonite iron salt suspension.

[0056] 1.4 Preparation of sunflower leaf green synthetic nano-zero valent iron composite material suspension

[0057] Add...

Embodiment 2

[0063] The nano-zero-valent iron composite material prepared in Example 1 was used for the removal of U(VI) in water.

[0064] Take 20mL of 9 parts of uranium-containing wastewater with a concentration of 10mg / L, adjust the pH to 5, add 0.1g of the composite material prepared in Example 1, and place them in a constant temperature shaking box at 30°C to react 10, 20, 30, 40, 50, 60, 70, 80, 90min, take samples after filtration. The concentration of residual uranium was measured by 5-Br-Padap spectrophotometry, and the results were as follows figure 2 shown.

[0065] The results showed that the removal efficiency increased rapidly in the first 20 minutes of the reaction, and the reaction rate was fast. After 70 minutes, it basically reached equilibrium, and the removal efficiency reached 98.73%.

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Abstract

The invention provides a preparation method of a nano zero-valent iron composite material. The preparation method comprises the following steps: S1) mixing a carrier with an iron salt solution in a protective atmosphere to obtain a carrier-iron salt suspension; and S2) in a protective atmosphere, mixing the carrier-iron salt suspension with a sunflower leaf extract, and carrying out a reaction toobtain the nano zero-valent iron composite material. Compared with the prior art, the preparation method takes the sunflower leaf extract as a reducing agent, and abundant plant resources are fully utilized; the required equipment is simple, the operation method is simple, the cost is low, and the environment friendliness is achieved; meanwhile, the obtained nano zero-valent iron has uniform material particles and has good dispersity, stability and reaction activity; and moreover, the components in the sunflower leaf extract can also interact with nanometer zero-valent iron, so that the capacity of treating uranium-containing wastewater by the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of loaded nanomaterials, and in particular relates to a preparation method and application of a nanometer zero-valent iron composite material. Background technique [0002] Nano-iron is an iron particle with a particle size of 1-100nm, which has the characteristics of small particle size, large specific surface area, and strong reactivity, so it has good adsorption and reaction performance. Nano-iron is widely used in the treatment of environmental pollutants, such as the removal of heavy metals, chlorinated organics, nitrates and other environmental pollutants, and has a very broad application prospect in the field of environmental restoration. [0003] At present, the commonly used methods for the preparation of nanometer zero-valent iron include physical and chemical methods, the most common being the liquid-phase chemical reduction method, which is to add a strong chemical reducing agent (NaBH 4 or KBH ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F101/20
CPCB01J20/0229C02F1/281C02F2101/20
Inventor 刘清吴杨招国栋滑熠龙
Owner NANHUA UNIV
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