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Method for extracting green synthesis nanometer zero-valent iron through shaddock peels and application

A technology of pomelo peel extract and nano-zero-valent iron, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of using toxic chemical reagents, easy aggregation of particles, complicated processes, etc. Achieve the effect of high clearance rate, good dispersion and simple process

Inactive Publication Date: 2017-01-11
广州润方环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing synthesis technology, and provide a method for preparing green synthetic nano-iron particles, so as to overcome the high cost of traditional nano-iron particle synthesis methods, requiring special equipment, complicated processes, and the use of toxic chemical reagents , the synthesized particles are easy to agglomerate, easy to be oxidized and other problems

Method used

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  • Method for extracting green synthesis nanometer zero-valent iron through shaddock peels and application
  • Method for extracting green synthesis nanometer zero-valent iron through shaddock peels and application
  • Method for extracting green synthesis nanometer zero-valent iron through shaddock peels and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of pomelo peel extract comprises the steps:

[0032] 1) Weigh 10g of fresh pomelo peel, put it in 100ml of deionized water, and extract in a water bath at 60°C;

[0033] 2) Set the water bath extraction time to 20-120 minutes, and take samples every 20 minutes;

[0034] 3) The extracted extract was vacuum filtered, centrifuged at 14,000 rpm, passed through a 0.45 μm filter membrane, and the filtrate was refrigerated at 4° C. in a refrigerator.

[0035] figure 1 The effect of time on the extraction effect in the extraction process of the prepared pomelo peel extract. Depend on figure 1 It can be seen that within 80 minutes, with the prolongation of the extraction time, the antioxidant capacity of the extract increases, and reaches the maximum at 80 minutes, so 80 minutes is the best extraction time.

Embodiment 2

[0037] The preparation method of pomelo peel extract comprises the steps:

[0038] 1) Weigh 10g of fresh pomelo peel, place it in 100ml deionized water, and extract in a water bath at 70°C;

[0039] 2) The water bath extractant is deionized water, wherein the deionized water is adjusted to pH with 0.1mol / L hydrochloric acid solution and sodium hydroxide solution, and extracted with different pH extractants;

[0040] 3) The extracted extract was vacuum filtered, centrifuged at 12000 rpm, passed through a 0.45 μm filter membrane, and the filtrate was refrigerated in a refrigerator at 4°C.

[0041] figure 2 The effect of different pH extractants on the extraction process of pomelo peel extract. The pH of pomelo peel extract is about 4.8, which is determined by figure 2 It can be seen that when the pH is between 4-5, the antioxidant capacity per unit mass is the largest, and when the pH exceeds 5, as the pH increases, the antioxidant capacity per unit mass of the extract grad...

Embodiment 3

[0043] Green synthetic nano-iron particles Cm-Fe-NPs (citrus maxima in Latin name, Fe nanoparticles in English name of nano-iron, because this material is nano-iron particles synthesized by green grapefruit peel extract, so the material is named Cm-Fe- NPs) preparation method, comprises the steps:

[0044] 1) Weigh 10g of fresh pomelo peel, put it in 100ml of deionized water, and extract in a water bath at 90°C for 80min;

[0045]2) vacuum filter the extracted extract, centrifuge at 11,000 rpm, pass through a 0.45 μm filter membrane, and store the filtrate in a refrigerator at 4°C;

[0046] 3) Take 150ml pomelo peel extract and 50ml of 0.10moL / L FeSO 4 The solution was mixed and reacted under the protection of nitrogen at a volume ratio of 3:1. The color of the solution changed from yellow to black under stirring, and a solution containing green synthetic nano-iron particles was obtained. The generated material was centrifuged, and the centrifuged material was washed, After ...

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Abstract

The invention discloses a preparation method for extracting green synthesis nanometer zero-valent iron through shaddock peels and application. According to the preparation method, a shaddock peel extracting solution is used as a reducing agent, reduced ferric ions or divalent ferrous ions are used as a nano-iron based material, and a green remediation material, namely, green synthesis nano-iron particles, of chromium contaminated water is prepared and obtained. The method is low in energy consumption and cost, environment-friendly, simple in process and convenient to operate, the obtained green synthesis nanometer zero-valent iron is good in stability, and the removal rate on chromium contamination in waste water is high. The surface of the material is coated with some organic substances in the extracting solution, is prevented from being in direct contact with air and is not prone to being oxidized. Cr(VI) can be fast reduced into Cr(III), finally Cr(III) removal is achieved in the form of insoluble hydroxide (Cr(OH)3 and / or FexCr1-x(OH)3) sediment, no toxic substance is separated out, and not secondary contamination is generated.

Description

technical field [0001] The invention belongs to the technical field of nano-material preparation and environmental pollution control and repair, and in particular relates to a green repair material for heavy metal chromium polluted water body-a method and application of green synthesis of nano-zero-valent iron by using grapefruit peel extract. Background technique [0002] Chromium is a widely distributed element in nature, widely used in chemical industry, light industry, leather, textile, metallurgy, electroplating and other industries. Chromium exists mainly in the form of metallic chromium, trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) in nature. Among them, metallic chromium does not exist in the natural state, hexavalent chromium is the most toxic, and is one of the 47 most dangerous wastes recognized internationally. Hexavalent chromium has been included in the priority list of toxic pollutants by the US Environmental Protection Agency and stipulated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00C02F1/70B82Y40/00B82Y30/00C02F101/22
CPCB82Y30/00B82Y40/00C02F1/705B22F9/24C02F2101/22B22F1/054
Inventor 方战强魏玉芬
Owner 广州润方环保科技股份有限公司
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