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Preparation and application of greenly synthesized biochar supported zero-valent iron nanomaterial

A nano-zero-valent iron, green synthesis technology, applied in water pollutants, other chemical processes, water treatment parameter control and other directions, can solve the problems of easy oxidation of nanoparticles, unfavorable implementation and application, secondary pollution, etc. , enhance the stability, enhance the effect of dispersibility

Inactive Publication Date: 2018-05-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the existing nano-zero-valent iron preparation method. The nano-zero-valent iron and modified nano-zero-valent iron produced by the existing method are easy to cause secondary production because sodium borohydride is used in the preparation process. pollution, and the prepared nanoparticles are easy to oxidize and agglomerate, which is not conducive to practical application

Method used

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  • Preparation and application of greenly synthesized biochar supported zero-valent iron nanomaterial
  • Preparation and application of greenly synthesized biochar supported zero-valent iron nanomaterial
  • Preparation and application of greenly synthesized biochar supported zero-valent iron nanomaterial

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preparation example Construction

[0037]In order to illustrate the present invention more clearly, the present invention provides a specific embodiment of a method for preparing a green synthetic biochar-loaded nano-zero-valent iron material. The preparation method of this embodiment includes the following steps:

[0038] (1) Preparation of biochar:

[0039] Put the crushed crop stalks into a muffle furnace, raise the temperature at 10-20°C / min to 300-700°C, keep the temperature constant for 7-14 hours, take it out to cool, grind, and pass through a 100-300 mesh screen to obtain a black powder.

[0040] Take 3-9g of black powder into a three-necked flask, then add 50-100mL of 1mol / L hydrochloric acid solution, heat in a water bath at 20-30°C, stir mechanically for 12-36 hours, filter, wash with distilled water until the pH is neutral, put Dry in a vacuum oven at 40-80°C for 48-60 hours, take it out, and obtain biochar powder;

[0041] (2) prepare green tea extract:

[0042] Weigh 10g-40g green tea and add it...

Embodiment 1

[0061] (1) Preparation of biochar:

[0062] Put the crushed corn stalks into a muffle furnace, raise the temperature at 20°C / min to 700°C, keep the temperature at a constant temperature for 6 hours, take it out, cool it down to room temperature naturally, grind it, and pass it through a 200-mesh sieve to obtain a black powder.

[0063] Take 5g of black powder into a three-necked flask, then add 50mL of 1mol / L hydrochloric acid solution, heat in a water bath at 25°C, stir mechanically for 12h, filter, wash with distilled water until the pH is neutral, and dry in a vacuum oven at 50°C 60h, take it out, obtain biochar powder, and set aside;

[0064] (2) prepare green tea extract:

[0065] Weigh 30g of green tea into 500mL of distilled water, heat in a water bath at 80°C for 100min, cool to room temperature, filter to obtain the green tea extract, and set aside;

[0066] (3) Preparation of biochar and iron ion mixed solution:

[0067] Add 0.125g of biochar powder and 6.25mmol o...

Embodiment 2

[0074] (1) Preparation of biochar:

[0075] Put the crushed wheat straw into a muffle furnace, heat up to 600°C at 10°C / min, keep the temperature for 10h, take it out, cool it down to room temperature naturally, grind it, and pass it through a 300-mesh sieve to obtain a black powder.

[0076] Take 4g of black powder into a three-necked flask, then add 50mL of 1mol / L hydrochloric acid solution, heat in a water bath at 25°C, stir mechanically for 36h, filter, wash with distilled water until the pH is neutral, and dry in a vacuum oven at 80°C 48h, take out, obtain biochar powder, set aside;

[0077] (2) prepare green tea extract:

[0078] Weigh 20g of green tea into 500mL of distilled water, heat in a water bath at 85°C for 90min, cool to room temperature, filter to obtain the green tea extract, and set aside;

[0079] (3) Preparation of biochar and iron ion mixed solution:

[0080] Add 0.125g of biochar powder and 6.25mmol of ferrous chloride to 50mL of distilled water, add i...

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Abstract

The invention relates to the technical field of metal nanoparticles, in particular to preparation and an application of greenly synthesized biochar supported metal nanoparticles. The preparation method comprises the following steps: dissolving biochar powder and iron salt (divalent or trivalent) in ethanol water to obtain a biochar and iron ion mixed solution; performing water bath on the biocharand iron ion mixed solution at 30-80 DEG C, adding a green tea extract solution under mechanical stirring, and continuously stirring the mixture for 10-30 min to obtain a greenly synthesized biochar supported zero-valent iron nano-solution; performing separation with a suction filtration method to obtain a precipitate, and drying the precipitate at 40-80 DEG C for 36-72 h to obtain the greenly synthesized biochar supported zero-valent iron nanomaterial. The method has the advantages that the process is simple, the method is green, the cost is low, and the like; the prepared greenly synthesizedbiochar supported zero-valent iron nanomaterial can effectively repair underground water polluted by Cr (VI) ions, cannot cause secondary pollution, is safe to use and has huge application value.

Description

technical field [0001] The invention relates to the technical field of metal nanoparticles, in particular to a preparation method and application of green synthetic biochar-supported nano metal particles. Background technique [0002] The rapid development of industry and urbanization has aggravated the problem of environmental pollution. The heavy metal pollution of groundwater is particularly serious. Groundwater is one of the important water resources. Especially in the northern water-scarce areas, groundwater is an indispensable water resource. However, chromium salts It is an important industrial raw material. The widespread use of chromium salts in industry has led to the increasingly serious problem of chromium pollution in groundwater. The stable forms of chromium are Cr(Ⅲ) and Cr(Ⅵ). Among them, Cr(Ⅵ) is an internationally recognized strong carcinogen. Substances, Cr(Ⅵ) is easily absorbed by the human body, which is very harmful to the skin, digestive tract, respira...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32C02F1/28C02F1/70C02F101/22
CPCB01J20/20B01J20/3234C02F1/281C02F1/705C02F2101/22C02F2209/06
Inventor 祝方邓小强高亚琴刘涛
Owner TAIYUAN UNIV OF TECH
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