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A kind of preparation method of loaded nanometer zero valent iron composite material

A nano-zero-valent iron and composite material technology, applied in nanotechnology, chemical instruments and methods, water pollutants, etc., can solve the problems of limited physical adsorption and precipitation in pollutant removal, limited effect of stubborn organics and metal ions, etc. Achieve the effect of cost reduction, green mass production, and uniform appearance

Active Publication Date: 2016-09-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nano Mg(OH) 2 As a low-cost, environmentally friendly water treatment agent, it shows good application prospects in acid wastewater treatment, heavy metal removal, printing and dyeing wastewater decolorization, etc., but its removal of pollutants is limited to physical adsorption and precipitation. Limited effectiveness against stubborn organics and metal ions

Method used

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  • A kind of preparation method of loaded nanometer zero valent iron composite material
  • A kind of preparation method of loaded nanometer zero valent iron composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. At room temperature, slowly add 1mol / L NaOH aqueous solution to the same volume of 0.5mol / LMgSO 4 solution (v C 3 h 8 o 3 :v H 2 (0=15:85), keep stirring vigorously during the dropwise addition, continue to stir for 6 hours after the dropwise addition is completed, then age for 24 hours, centrifuge, wash with deionized water and absolute ethanol three times successively, and dry at 50°C to obtain micro / Nanocomposite flower-like self-supporting Mg(OH) 2 Microspheres;

[0028] Step 2, 0.416g Mg(OH) 2 Disperse in 75mL absolute ethanol (ultrasonic dispersion 5min), 2.085g FeSO 4 ·7H 2 O was dissolved in 75mL deionized water, and the two were transferred into a 500ml three-neck flask (concentration was 0.05mol / L (v absolute ethanol:v deionized water=1:1) FeSO 4 solution);

[0029] Step 3. Keep mechanical stirring at 300r / min, feed N 2 Isolate and protect, then add dropwise an equal volume (150mL) of 0.25mol / L NaBH to the three-necked flask 4 solution, the...

Embodiment 2

[0033] Step 1, is identical with embodiment 1;

[0034] Step 2, 0.832g Mg(OH) 2 Disperse in 75mL absolute ethanol (ultrasonic dispersion 5min), 2.085g FeSO 4 ·7H 2 O was dissolved in 75mL deionized water, and the two were transferred into a 500mL three-necked flask (concentration of 0.05mol / L (v absolute ethanol:v deionized water=1:1) FeSO 4 solution);

[0035] Step 3. Keep mechanical stirring at 300r / min, feed N 2 Isolate and protect, then add dropwise equal volume (150ml) 0.25mol / L NaBH to the there-necked flask 4 solution, the dropping rate is 3ml / min, and the stirring is continued for 30min after the addition is completed. The black solid obtained from the reaction is separated by centrifugation, washed with water and ethanol three times in turn, and vacuum-dried at 45°C for 12h to obtain Mg(OH) with a theoretical loading capacity of 33%. 2 Supported nano-zero-valent iron composites.

Embodiment 3

[0037] Step 1, is identical with embodiment 1;

[0038] Step 2, 0.208g Mg(OH) 2 Disperse in 75mL absolute ethanol (ultrasonic dispersion 5min), 2.085g FeSO 4 ·7H 2 O was dissolved in 75ml deionized water, and the two were moved into a 500ml three-necked flask (concentration was 0.05mol / L (v absolute ethanol:v deionized water=1:1) FeSO 4 solution);

[0039] Step 3. Keep mechanical stirring at 300r / min, feed N 2 Isolate and protect, then add dropwise an equal volume (150mL) of 0.25mol / L NaBH to the three-necked flask 4 solution, the dropping rate was 3mL / min, and the stirring was continued for 30 minutes after the dropping was completed. The black solid obtained from the reaction was separated by centrifugation, washed with water and ethanol three times in turn, and dried in vacuum at 45°C for 12 hours to obtain Mg(OH) with a theoretical loading capacity of 67%. 2 Supported nano-zero-valent iron composites.

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Abstract

The invention discloses a preparation method of a load type nanometer zero-valent iron composite material. The preparation method comprises the following steps: a) preparing a micro / nanometer grade composite flower-shaped self-supported Mg (OH) 2 microballoon' b) dispersing it to iron / ferrous ion solution with certain concentration; c) dropwise adding sodium borohydride solution in the mixed solution, and restoring iron / ferrous ion at original site to prepare Mg (OH) 2 loaded nanometer zero-valent iron. The preparation method has the following advantages: 1. the preparation method is soft in condition, simple in operation, green and environment-friendly and convenient to realize the quantitative production; 2, the raw material is wide in source and low in price, and good for reducing cost; 3, the load volume of the load type nanometer zero-valent iron is adjustable, the product shape is uniform and the dimension is controllable; 4, the nanometer zero-valent iron obtained by the invention has high-efficient removing ability for heavy metal ions, organic solution, dye and other environmental pollutants, and can be used as the water disposal agent in an environmental domain.

Description

technical field [0001] The invention relates to a preparation method of a loaded nanometer zero-valent iron composite material, which belongs to the field of inorganic nanometer materials. Background technique [0002] Nanoscale zero-valent iron (nZVI) has been successfully applied to treat chlorinated organic compounds, nitroaromatic compounds, dyes and heavy metal pollutants in groundwater / wastewater due to its high specific surface area, high activity, and strong reducibility. There are more than 20 groundwater in situ remediation sites based on nZVI materials in the world. However, the small particle size of nZVI and the agglomeration caused by its own magnetic properties lead to a sharp decline in activity, lifetime, and processing efficiency, which seriously hinders the large-scale application of nZVI. By loading nZVI on other materials, the above problems can be effectively solved. The reported supporting materials include two types: one is natural mineral materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00C02F1/70C02F101/20C02F101/30
Inventor 林璋刘明辉王永好陈伦泰吴智诚
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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