Preparation method of coated nano zero-valent iron

A nano-zero-valent iron, coated technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as affecting reactivity, and achieve uniform particle size distribution and repeatability. The effect of high utilization times and good decolorization ability

Inactive Publication Date: 2018-04-06
SHAANXI SHENGMAI PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional NzVI is easily oxidized, and a dense oxide film is formed on the surface, which affects its reactivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of coated nanometer zero valent iron comprises the following steps:

[0022] (1) FeCl 3 ·6H 2 O was added to an ethanol solution with a mass concentration of 30%, stirred and mixed, and then microwaved for 15 minutes under the condition of a microwave power of 200W; wherein, FeCl 3 ·6H 2 O, the addition ratio of ethanol solution is 1g:60mL;

[0023] (2) Add ethyl silicate to the system in step (1), and pass nitrogen gas for 15 minutes at a speed of 20mL / min, while stirring, and naturally cool to room temperature; wherein, the volume of ethyl silicate is step (1) 0.2 times the volume of ethanol solution;

[0024] (3) Heat the system obtained in step (2) to 50°C for 30 minutes, then continue to heat up to 70-80°C for 10 minutes, and then cool it down to room temperature, and disperse it ultrasonically for 15 minutes; the conditions for ultrasonic dispersion are: ultrasonic power 200W, ultrasonic frequency 40Hz;

[0025] (4) Introduce nitrogen ...

Embodiment 2

[0027] The preparation method of coated nanometer zero valent iron comprises the following steps:

[0028] (1) FeCl 3 ·6H 2 O was added to an ethanol solution with a mass concentration of 30%, stirred and mixed, and then microwaved for 15 minutes under the condition of a microwave power of 500W; wherein, FeCl 3 ·6H 2 O, the addition ratio of ethanol solution is 1g:60mL;

[0029] (2) Add ethyl silicate to the system in step (1), and pass nitrogen gas for 30 minutes at a speed of 20mL / min, while stirring, and naturally cool to room temperature; wherein, the volume of ethyl silicate is the step (1) 0.5 times the volume of ethanol solution;

[0030] (3) Heat the system obtained in step (2) to 60°C for 30 minutes, then continue to heat up to 70-80°C for 20 minutes, and then cool it down to room temperature, and disperse it ultrasonically for 15 minutes; the conditions for ultrasonic dispersion are: ultrasonic power 400W, ultrasonic frequency 40Hz;

[0031] (4) Introduce nitro...

Embodiment 3

[0033] The preparation method of coated nanometer zero valent iron comprises the following steps:

[0034] (1) FeCl 3 ·6H 2 O was added to the ethanol solution with a mass concentration of 30%, stirred and mixed, and then microwaved for 15 minutes under the condition of a microwave power of 300W; wherein, FeCl 3 ·6H 2 O, the addition ratio of ethanol solution is 1g:60mL;

[0035] (2) Add ethyl silicate to the system in step (1), and feed nitrogen gas for 20 minutes at a rate of 20 mL / min, while stirring, and naturally cool to room temperature; wherein, the volume of ethyl silicate is (1) 0.3 times the volume of ethanol solution;

[0036] (3) Heat the system obtained in step (2) to 50-60°C for 30 minutes, then continue to heat up to 70-80°C for 10-20 minutes, and then cool it down to room temperature, and then ultrasonically disperse it for 15 minutes; among them, the conditions for ultrasonic dispersion For: ultrasonic power 300W, ultrasonic frequency 40Hz;

[0037] (4) ...

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PUM

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Abstract

The invention discloses a method for preparing coated nanometer zero-valent iron, which comprises the following steps: (1) adding FeCl3·6H2O into an ethanol solution, stirring and mixing, and then microwave treatment; Add ethyl silicate, blow nitrogen gas for 15-30min, stir at the same time, and cool down to room temperature naturally; (3) Heat up the system obtained in step (2) for 30min, then continue to heat up for reaction, cool down to room temperature naturally, and disperse by ultrasonic 15min; (4) Introduce nitrogen into the system of step (3), then dropwise add KBH4 solution, react for 15-30min after the dropwise addition, let stand for 60-90min, filter, and wash the obtained precipitate with ethanol and distilled water respectively 3 times, vacuum dry. The coated nanometer zero-valent iron provided by the invention has a uniform particle size distribution, good decolorization ability, high repetition times and high recycling rate.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a preparation method of coated nanometer zero-valent iron. Background technique [0002] At present, a large number of dyes are used in various industrial productions in my country every year. These dyes mainly include three types of azo, anthraquinone and triphenylmethane, and the annual output exceeds 7×10 5 Ton. Among them, untreated dyes discharged with wastewater accounted for 15% of the total usage. Many dyes have serious carcinogenicity, teratogenicity and mutagenicity, which pose a great threat to the safety of aquatic organisms and human beings. Based on this, dye wastewater must undergo harmless treatment before it can be discharged. [0003] Common dye wastewater treatment methods can be divided into physical, chemical and biological methods. Among them, the chemical method has high decolorization efficiency and wide application range, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70
CPCC02F1/705
Inventor 王耀斌
Owner SHAANXI SHENGMAI PETROLEUM
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