Clay mineral supported nano zero-valent iron as well as preparation method and application thereof

A nano-zero-valent iron and clay mineral technology, applied in the field of environmental chemistry, can solve the problems of high toxicity, neonicotinoid pesticide residue pollution, expensive reducing agent sodium borohydride, etc., to reduce agglomeration and increase reactive sites point, the effect of improving the restoration performance

Inactive Publication Date: 2019-11-05
LIUYANG BRANCH OF CHANGSHA COMPANY OF HUNAN TOBACCO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the purpose of the present invention is to provide a clay mineral-loaded nano-zero-valent iron and its preparation method and application, which can solve the problem of the high price, high toxicity and neonicotinoid in the water body of the reducing agent sodium borohydride in the existing preparation method. The problem of pesticide residue pollution

Method used

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  • Clay mineral supported nano zero-valent iron as well as preparation method and application thereof
  • Clay mineral supported nano zero-valent iron as well as preparation method and application thereof
  • Clay mineral supported nano zero-valent iron as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of clay mineral-loaded nanometer zero-valent iron

[0035] (1) Dried tobacco stems or green walnut peels and pulverized them, crossed a 40-60 mesh sieve, and added mass fraction of 70-80% ethanol aqueous solution to the powder of tobacco stems or green walnut peels, the solid-to-liquid ratio of the two was 1g: 10-30mL, ultrasonically extract at 40°C for 10-20min, heat to reflux at 65-85°C for 1-2h, filter, and collect the filtrate for later use;

[0036] (2) After dissolving 4.0-6.0 g of ferric chloride hexahydrate with 50-100 mL of ethanol aqueous solution with a mass fraction of 20-40%, add 2-4 g of clay minerals, and ultrasonically disperse for 5-10 minutes to obtain a mixed solution;

[0037] (3) Add the filtrate obtained in step (1) dropwise to the mixed solution described in step (2), the volume ratio of the filtrate and the mixed solution is 2:1, mechanically stir under nitrogen protection 1h;

[0038] (4) washing the solution obtained in ...

preparation example 1

[0040] Preparation example 1 Montmorillonite loaded nanometer zero-valent iron

[0041] (1) Dried tobacco stems or green walnut peels, crushed them, passed through a 40-mesh sieve, and added 70% ethanol water solution with a mass fraction of 70% to the powder of tobacco stems or green walnut peels. Ultrasonic extraction for 20 minutes, heated to reflux at 65°C for 2 hours, filtered, and the filtrate was collected for later use;

[0042] (2) After dissolving 4.0 g of ferric chloride hexahydrate with 50 mL of 40% ethanol aqueous solution, add 2 g of montmorillonite, and ultrasonically disperse for 5-10 min to obtain a mixed solution;

[0043] (3) Add the filtrate obtained in step (1) dropwise to the mixed solution described in step (2), the volume ratio of the filtrate and the mixed solution is 2-4:1, under nitrogen protection Mechanical stirring for 1-2h;

[0044] (4) washing the solution obtained in step (3) with absolute ethanol and deionized water for 2-4 times, and freeze-d...

Embodiment 2

[0060] Embodiment 2 Different materials compare the removal effect of neonicotinoid pesticides

[0061] The initial concentration of three neonicotinoid pesticides was set to 20mg / L, the reaction temperature was 35°C, the initial pH value of the solution was 3, and the material dosage was 2g / L. The removal effects of the clay mineral-loaded nano-zero-valent iron prepared by the present invention and the conventional clay mineral-loaded nano-zero-valent iron prepared with sodium borohydride as a reducing agent on three neonicotinoid pesticides are shown in Table 1.

[0062] Table 1 The removal effect of different materials on neonicotinoid pesticides

[0063]

[0064]

[0065] It can be seen from the data in the above table that the removal rates of the three neonicotinoid pesticides are all low for the clay minerals montmorillonite, attapulgite and kaolin, and the removal rate of the three neonicotinoid pesticides by nano-zero-valent iron is only 74.1% %, 65.2% and 79.8...

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Abstract

The invention belongs to the technical field of environment chemicals and in particular relates to clay mineral supported nano zero-valent iron as well as a preparation method and application thereof.According to the preparation method, tobacco stems and green walnut peel are adopted to prepare plant extracts to replace sodium borohydride as a reducing agent which is large in toxicity and high inprice in a common preparation method, and thus the clay mineral supported nano zero-valent iron is prepared; meanwhile, the effect that the clay mineral supported nano zero-valent iron is capable ofefficiently removing residues of anabasine pesticides in a water body is found for a first time, and the clay mineral supported nano zero-valent iron has a degradation effect prior to those of a claymineral, nano zero-valent iron and clay mineral supported nano zero-valent iron which is prepared by using a common method; degradation conditions of the clay mineral supported nano zero-valent iron upon the anabasine pesticides are optimized; preparation conditions and degradation conditions of the clay mineral supported nano zero-valent iron are optimized, and great significances are achieved for diversely utilizing agricultural production wastes, lowering the production cost and reducing environment pollution; and meanwhile, the clay mineral supported nano zero-valent iron is simple in reaction process and has very good market prospects in repairing treatment on anabasine pesticide polluted environments.

Description

technical field [0001] The invention belongs to the technical field of environmental chemistry, and in particular relates to a clay mineral loaded nanometer zero-valent iron, a preparation method and application thereof. Background technique [0002] Due to its advantages of strong reducibility, high reactivity, and low price, nanometer zero-valent iron is widely used in the remediation and treatment of environmental pollutants, and it is a research hotspot in the current environmental field. At present, there have been many reports on the preparation methods of nano-sized zero-valent iron or supported nano-sized zero-valent iron at home and abroad. The Chinese patent application CN201610268887.1 discloses the preparation method of sodium alginate / inorganic mineral joint-loaded nano-zero-valent iron, which uses sodium alginate and inorganic minerals as carriers to prepare nano-zero-valent iron, which has good dispersion performance, but The reducing agent is sodium borohydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/30
CPCC02F1/705C02F2101/306
Inventor 赵阿娟丁春霞曾维爱姚茗淞蔡海林谢鹏飞翟争光杨远段美珍戴杏华
Owner LIUYANG BRANCH OF CHANGSHA COMPANY OF HUNAN TOBACCO
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