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Nano zero-valent iron loaded magnetic nano illite-montmorillonite clay and preparation method and application thereof

A technology of nano-zero-valent iron and Imon clay, which is applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as unfavorable magnetic separation and low precursor preparation efficiency, and achieve Shorten the preparation time, reduce the cost of post-processing, good dispersion effect

Inactive Publication Date: 2017-07-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the prior art is: the clay minerals used to load nanometer zero-valent iron are mostly micron-sized particles, and the coarse particles lead to the production of Fe 2+ / Fe 3+ When the clay precursor is saturated, Fe 2+ / Fe 3+ It takes a long reaction time to enter the clay mineral layer, resulting in low precursor preparation efficiency; in addition, the prepared minerals loaded with nano-zero-valent iron have low magnetic properties, which is not conducive to magnetic separation after adsorption treatment.

Method used

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  • Nano zero-valent iron loaded magnetic nano illite-montmorillonite clay and preparation method and application thereof
  • Nano zero-valent iron loaded magnetic nano illite-montmorillonite clay and preparation method and application thereof
  • Nano zero-valent iron loaded magnetic nano illite-montmorillonite clay and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of magnetic nano-Imon clay loaded with nano-zero-valent iron:

[0035] (1) Prepare nano-Imon clay slurry with a solid content of about 50wt.% into Imon clay slurry with a solid content of 5wt.%, and then use a vertical high-shear disperser to disperse at 1500r / min for 20 minutes. A stable and uniform nano-Imon clay slurry is formed.

[0036] (2) 160mL of absolute ethanol was added to 40mL of 5wt.% Yimeng clay slurry to prepare 200mL of mixed solution. Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 4.84g, then added to Yimeng clay suspension. The precursor solution was obtained by stirring for 30 minutes under the assistance of ultrasonic, the ultrasonic power was 150W, and the speed of the stirrer was 300r / min. Nitrogen was introduced for protection during the stirring process.

[0037] (3) Put 2.72g sodium borohydride (NaBH 4 ) Dissolve in 240mL deionized water to make a reducing agent.

[0038] (4) Add dropwise the sodium borohydride solution prepared in st...

Embodiment 2

[0049] To prepare magnetic nano-Imon clay loaded with nano-zero-valent iron:

[0050] (1) Prepare the nano-Imon clay slurry with a solid content of about 45wt.% into an Imon clay slurry with a solid content of 2wt.%, and then use a vertical high-shear disperser to disperse at 500r / min for 30 minutes to form Stable and uniform nano-Imon clay slurry.

[0051] (2) Add 100 mL of absolute ethanol to 100 mL of 2wt.% Yimeng clay slurry to prepare 200 mL of mixed solution. Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 4.84g, then added to Yimeng clay suspension. The precursor solution was obtained by stirring for 30 minutes under the assistance of ultrasonic, the ultrasonic power was 100W, and the speed of the stirrer was 500r / min. Nitrogen was introduced for protection during the stirring process.

[0052] (3) Put 2.72g sodium borohydride (NaBH 4 ) Dissolve in 120mL deionized water to make a reducing agent.

[0053] (4) Add dropwise the sodium borohydride solution prepared in step (3...

Embodiment 3

[0056] To prepare magnetic nano-Imon clay loaded with nano-zero-valent iron:

[0057] (1) Prepare the nano-Imon clay slurry with a solid content of about 45wt.% into an Imon clay slurry with a solid content of 10wt.%, and then use a vertical high-shear disperser to disperse at 1000r / min for 60min to form Stable and uniform nano-Imon clay slurry.

[0058] (2) Add 160 mL of absolute ethanol to 40 mL of 10 wt.% Yimeng clay slurry to prepare 200 mL of mixed solution. Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 9.68g, and then added to Yimeng clay suspension. The precursor solution was obtained by stirring for 60 minutes under the assistance of ultrasonic, the ultrasonic power was 250W, and the speed of the stirrer was 500r / min. Nitrogen was introduced for protection during the stirring process.

[0059] (3) Put 6.72g sodium borohydride (NaBH 4 ) Dissolve in 240mL deionized water to make a reducing agent.

[0060] (4) Add dropwise the sodium borohydride solution prepared in step ...

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Abstract

The invention discloses a preparation method of nano zero-valent iron loaded magnetic nano illite-montmorillonite clay. The preparation method includes following steps: (1), adding deionized water into nano illite-montmorillonite clay to obtain a stable suspension; (2), adding ferric trichloride hexahydrate into the suspension, adding anhydrous alcohol, and ultrasonically stirring to obtain a precursor solution; (3), preparing sodium borohydrate or potassium borohydrate solution, and dropwise adding the solution into the precursor solution in a nitrogen atmosphere; (4), using a magnet for gathering to obtain a product, and washing; (5), performing vacuum drying and grinding on the product to obtain nano zero-valent iron loaded magnetic nano illite-montmorillonite clay powder. The invention further discloses the nano zero-valent iron loaded magnetic nano montmorillonite clay prepared by the method and application thereof. The nano zero-valent iron loaded magnetic nano illite-montmorillonite clay prepared by the method has high reaction activity and has remarkable treatment effect on wastewater containing hexavalent chromium, and an outer magnetic field can be utilized for separation after treatment is finished.

Description

Technical field [0001] The invention relates to the field of nano material preparation and application, in particular to a magnetic nano-Imon clay loaded with nano-zero-valent iron, and a preparation method and application thereof. Background technique [0002] With the development of industry, the discharge of polluted wastewater containing heavy metals is becoming more and more serious. Heavy metal ions are difficult to be biodegraded and are easily enriched through the biological chain, posing a great threat to human health. Clay minerals are commonly used environmental self-healing materials with excellent ion exchange and adsorption properties. At the same time, clay minerals have the advantages of fine particles, wide sources, and low cost. [0003] Clay minerals used to adsorb heavy metal ions in water are difficult to be enriched after treatment of wastewater. Therefore, many researchers load magnetic particles on the clay to prepare composite clays suitable for separation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F1/62C02F101/22
CPCB01J20/02B01J20/12B01J20/28009B01J2220/42B01J2220/4806C02F1/281C02F2101/22
Inventor 潘志东黎振源刘婷婷王燕民
Owner SOUTH CHINA UNIV OF TECH
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