Graphene oxide-loaded nano-iron material with magnetic separation properties in underground medium and preparation method thereof

An underground medium, graphene technology, applied in chemical instruments and methods, alkali metal oxide/hydroxide, polluted groundwater/leachate treatment, etc., can solve serious environmental toxicity, loss of reducing ability, migration performance, etc. It can reduce the toxic effect, improve the migration ability, and enhance the dispersion performance.

Inactive Publication Date: 2018-06-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the direct application of nano-iron slurry to groundwater pollution remediation still faces the following problems: first, nano-iron is easily oxidized in the air, resulting in reduced activity or even complete loss of reducing ability; second, nano-iron can only be dispersed to the pollution source after injection In order to play a repairing role, although the particle size of nano-iron is extremely small, its migration performance is poor, and the high surface energy and inherent magnetic response make it difficult to disperse into water or organic solvents; again, nano-iron is easy to aggregate Or deposited on the surface of media particles, the gaps are blocked due to agglomeration
[0009] Although the above-mentioned patents have improved the problem of agglomeration and promoted material migration by using methods such as surfactants, polymer modification, or material loading, the ideal groundwater restoration material should have both anti-agglomeration and anti-passivation properties, and if the material Remains in the ground, which has a serious toxic effect on the environment, so groundwater restoration materials should also have separable properties

Method used

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  • Graphene oxide-loaded nano-iron material with magnetic separation properties in underground medium and preparation method thereof
  • Graphene oxide-loaded nano-iron material with magnetic separation properties in underground medium and preparation method thereof
  • Graphene oxide-loaded nano-iron material with magnetic separation properties in underground medium and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A. Dissolve 0.06g of dry GO (prepared by the improved Hummers method) in 1000 mL of deionized water and sonicate for 2 hours to obtain a GO suspension;

[0037] B. Add 7.11g ferrous chloride (FeCl 2 ·4H 2 O) 500mL solution was slowly injected into the GO suspension, and mechanically stirred for 30min;

[0038] C. Take 19.3g potassium borohydride (KBH 4 )Dissolved in deionized water to prepare 0.715mol / L KBH 4 Solution, add 1mol / L NaOH solution to the solution to adjust the pH to 9; under the protection of nitrogen, use the high-performance liquid reduction method and use the peristaltic pump to reduce the KBH 4 The solution was added to the mixed solution obtained in step B. After the addition was completed, the stirring was continued for 4 hours, and the Fe 2+ Reduced to Fe 0 , The dropping rate is 5mL / min, KBH in the solution after dropping 4 With FeCl 2 ·4H 2 The molar ratio of O is 10:1;

[0039] D. Use a magnet to collect the product prepared in step C, that is, graphene o...

Embodiment 2

[0041] A. Dissolve 0.12 g of dry GO (prepared by the improved Hummers method) in 1000 mL of deionized water and sonicate for 4 hours to obtain a GO suspension;

[0042] B. Add 9.93g ferrous sulfate (FeSO 4 ·7H 2 O) 500mL solution was slowly injected into the GO suspension, and mechanically stirred for 30min;

[0043] C. Take 19.3g KBH 4 Dissolved in deionized water to obtain 0.715mol / L KBH 4 Solution, add 1mol / L NaOH solution to the solution to adjust the pH value to 9.5; under the protection of nitrogen, use the high-performance liquid reduction method and use the peristaltic pump to reduce the KBH 4 The solution was added to the mixed solution obtained in step B. After the addition was completed, the stirring was continued for 4 hours, and the Fe 2+ Reduced to Fe 0 , The dropping rate is 6mL / min, KBH in the solution after dropping 4 With FeCl 2 ·4H 2 The molar ratio of O is 10:1;

[0044] D. Use a magnet to collect the product prepared in step C, that is, graphene oxide loaded nano-...

Embodiment 3

[0046] A. Dissolve 0.30 g of dry GO (prepared by the improved Hummers method) in 1000 mL of deionized water for 4 hours to obtain a GO suspension;

[0047] B. Then will contain 10.29g ferrous nitrate Fe(NO 3 ) 2 ·6H 2 A 500mL solution of O was slowly injected into the GO suspension and stirred mechanically for 30 minutes;

[0048] C. Take 13.6g of sodium borohydride (NaBH 4 ) Dissolved in deionized water to prepare 0.715mol / L NaBH 4 Solution, add 1mol / L NaOH solution to the solution to adjust the pH value to 10; under the protection of inert gas, use high-performance liquid reduction method to use peristaltic pump 4 The solution was added to the mixed solution obtained in step B. After the addition was completed, the stirring was continued for 4 hours, and the Fe 2+ Reduced to Fe 0 , The dropping rate is 5mL / min, and the NaBH in the solution after the addition is complete 4 With Fe(NO 3 ) 2 ·6H 2 The molar ratio of O is 10:1;

[0049] D. Use a magnet to collect the product prepared in...

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Abstract

Belonging to the field of nano material preparation, the invention in particular relates to a graphene oxide loaded nano-iron material with magnetic separation characteristics in an underground medium, wherein the nano-iron particle size is 20nm-100nm. The preparation method consists of: firstly, mixing dried graphene oxide with deionized water and conducting ultrasonic treatment to obtain a graphene oxide suspension; then fully mixing the graphene oxide suspension with a bivalent iron salt solution; and finally, slowly adding a hydroboron water solution dropwise under anaerobic conditions by efficient liquid phase reduction method so as to prepare the graphene oxide loaded nano-iron material with magnetic separation characteristics. The graphene oxide loaded nano-iron material prepared by the method provided by the invention improves the oxidation resistance, adsorption, stability, mobility and magnetic separation characteristics of nano-iron particles, also has a high removal rate on chromium heavy metal environmental pollutants, and is suitable for use as a repair reagent in the field of groundwater pollution in-situ remediation.

Description

Technical field [0001] The invention belongs to the field of preparation of nano materials, and specifically relates to a graphene oxide loaded nano iron material with magnetic separation characteristics in underground media and a preparation method thereof. The material can be used as a groundwater repair material in the field of groundwater pollution repair. Background technique [0002] Heavy metals such as lead, cadmium, arsenic and chromium are harmful to human health and the environment. Such pollutants have high solubility, high stability and strong mobility in water. If they are leaked or discharged into the environment, they It will cause soil and groundwater pollution, and the pollution lasts for a long time and has a wide range. Therefore, its restoration and governance has always been a difficult and hot issue in the environmental field. [0003] In recent years, the environment-friendly and efficient nano-zero-valent iron has been favored by environmentalists. It has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/205B01J20/28009B01J2220/4806C02F1/281C02F2101/22C02F2103/06
Inventor 迟子芳任黎明董军
Owner JILIN UNIV
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