Clay mineral loaded nanometer zero valent iron, and preparation method and use thereof

A nano-zero-valent iron and clay mineral technology, applied in the field of environmental chemistry, can solve the problems of high price of the reducing agent sodium borohydride, residual pollution of neonicotinoid pesticides, high toxicity, etc., and achieves increasing reactive sites and improving reduction. performance, reducing the effect of agglomeration

Inactive Publication Date: 2019-10-18
LIUYANG BRANCH OF CHANGSHA COMPANY OF HUNAN TOBACCO +1
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  • Summary
  • 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

Method used

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  • Clay mineral loaded nanometer zero valent iron, and preparation method and use thereof
  • Clay mineral loaded nanometer zero valent iron, and preparation method and use thereof
  • Clay mineral loaded nanometer zero valent iron, and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1 Preparation of clay minerals loaded with nano-zero valent iron

[0035] (1) Dry the tobacco stems or walnut green husks and crush them, pass a 40-60 mesh sieve, and add 70-80% ethanol aqueous solution to the powder of the tobacco stems or walnut husks, and the solid-liquid ratio of the two is 1g: 10-30mL, ultrasonic extraction at 40°C for 10-20min, heating and refluxing reaction at 65-85°C for 1-2h, filtering, and collecting the filtrate for use;

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

[0037] (3) Take the filtrate obtained in step (1) and add it dropwise to the mixed solution described in step (2). The volume ratio of the filtrate and the mixed solution is 2:1, and mechanically stirred under the protection of nitrogen 1h;

[0038] (4) Wash the solution obt...

Example Embodiment

[0040] Preparation Example 1 Montmorillonite loaded nano-zero-valent iron

[0041] (1) Dry tobacco stalks or walnut green husks, crush them, pass a 40-mesh sieve, and add 70% ethanol aqueous solution to the powder of tobacco stalks or walnut husks. The solid-to-liquid ratio of the two is 1g:10mL, 40℃ Ultrasonic extraction for 20min, heating and refluxing reaction at 65℃ for 2h, filtering, and collecting the filtrate for use;

[0042] (2) After dissolving 4.0 g of ferric chloride hexahydrate in 50 mL of an ethanol aqueous solution with a mass fraction of 40%, adding 2 g of montmorillonite, and ultrasonically dispersing for 5-10 minutes to obtain a mixed solution;

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

[0044] (4) The solution obtained in step (3) is washed 2-4 times with absolute eth...

Example Embodiment

[0060] Example 2 Comparison of the removal effects of different materials on neonicotinoid pesticides

[0061] The initial concentration of three neonicotinoid pesticides is set to 20mg / L, the reaction temperature is 35℃, the initial pH of the solution is 3, and the material dosage is 2g / L. The comparison of nano-zero-valent iron, clay minerals and 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 have the removal effect of three neonicotinoid pesticides. The results are shown in Table 1.

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

[0063]

[0064]

[0065] The data in the above table shows that the removal rate of the three neonicotinoid pesticides by the clay mineral montmorillonite, attapulgite and kaolin is low, and the removal rate of the three neonicotinoid pesticides by nano-zero valent iro...

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Abstract

The invention belongs to the technical field of environmental chemistry, and particularly relates to a clay mineral loaded nanometer zero valent iron, and a preparation method and use thereof. According to the clay mineral loaded nanometer zero valent iron, and the preparation method and the use thereof, tobacco stems and walnut green seedcases are used for preparing plant extracts, high toxicityand expensive sodium borohydride is replaced as reducing agents, and the clay mineral loaded nanometer zero valent iron is prepared; at the same time, the fact that the clay mineral loaded nanometer zero valent iron can effectively remove residues of anabasin pesticides in water is found for the first time, and the degradation effect is better than that of clay mineral, nanometer zero valent ironand clay mineral loaded nanometer zero valent iron prepared by conventional methods; and degradation conditions of the anabasin pesticides on the clay minerals loaded nanometer zero valent iron are optimized. According to the clay mineral loaded nanometer zero valent iron, and the preparation method and the use thereof, preparation conditions and the degradation conditions of the clay mineral loaded nanometer zero valent iron are optimized, great significance to diversified utilization of agricultural production wastes, reduction of production costs and reduction of environmental pollution areprovided; and at the same time, the reaction process is simple, and good market prospects in remediation and treatment of anabasine pesticide pollution environments are provided.

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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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戴杏华
Owner LIUYANG BRANCH OF CHANGSHA COMPANY OF HUNAN TOBACCO
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