Stable easy-separation nanoscale iron ball, preparation method thereof and application thereof

An easy-to-separate, nano-zero-valent iron technology, which is applied in the field of pollution sludge and water environment treatment, can solve the problems of poor NZVI stability, waste of financial and material resources, and costly manpower and material resources, so as to avoid agglomeration, overcome easy oxidation and Difficult to separate and improve utilization efficiency

Inactive Publication Date: 2012-07-25

TIANJIN NORMAL UNIVERSITY

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AI-Extracted Technical Summary

Problems solved by technology

However, NZVI has poor stability in the air and is easily oxidized or even spontaneously ignited, which brings a lot of inconvenience to the use and transportation of NZVI; it is difficult to separate the treated sludge and sewage from NZVI, and subsequent separation requires a lot of money. manpower and material resources

Although it has been reported that nano-zero-valent iron can be prepared into modified nano-scale iron powder with certain oxidation resistance and dispersibili...

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Abstract

The invention discloses a stable easy-separation nanoscale iron ball, a preparation method thereof and application thereof. The stable easy-separation nanoscale iron ball comprises crosslinking precursor solution and nanoscale zero-valent iron dispersion solution by the volume ratio of 15:1-3:1. The crosslinking precursor solution comprises, in weight/volume percent, 0.1%-15% of chitosan-acetum solution, and the nanoscale zero-valent iron dispersion solution comprises 0.1%-15% of Tween20, 20%-55% of nanoscale zero-valent iron powder and 1%-10% of scrap iron. When the nanoscale iron ball prepared by the preparation method is used for treating contaminated sludge and water, the basic decontamination performance of the nanoscale zero-valent iron powder can be kept, and the shortcomings of easiness in oxidization, difficulty in separation and the like of the nanoscale zero-valent iron powder can be overcome, the oxidizing velocity of NZVI (nanoscale zero-valent iron) particles is adjusted, and the utilization efficiency of the NZVI particles is improved. Therefore, the functional nanoscale iron ball can be used for practical engineering of contaminated sludge and water treatment on a large scale.

Application Domain

Microballoon preparationMicrocapsule preparation

Technology Topic

Zerovalent ironScrap +6

Examples

Experimental program(7)

Example

[0030] Example 1:

[0031] (1) Preparation of cross-linking precursor solution: Add appropriate amount of glacial acetic acid to anaerobic deionized water, and then add chitosan under constant heating and stirring conditions. After chitosan is completely dissolved, continue heating and stirring for 3 hours. Cool to room temperature. In the aforementioned crosslinking precursor solution, the volume fraction of acetic acid is 1%, and the mass/volume percentage content of the chitosan-acetic acid solution is 2%;

[0032] (2) Preparation of nano-iron dispersion solution: use deionized water as a solvent, adjust its pH to 6, then add Tween20, nano-iron powder and 10 mesh iron scraps, and use ultrasonic to disperse the powder for 10 minutes. The dispersed solution of nano iron is obtained. In the above dispersion solution, the mass percentage content of Tween20 is 0.5%; the mass percentage content of the nano zero-valent iron powder is 30%; the mass percentage content of the iron scraps is 2%;

[0033] (3) Preparation of nano-iron-based functional macrospheres: at a temperature of 20℃, mix the cross-linking precursor solution and the dispersion solution of nano-zero-valent iron at a volume ratio of 15:1, and then the mixed solution Add dropwise to the NaOH solution to form a ball with a diameter of 2 mm, and after curing and cross-linking for 30 hours, it is washed with deoxidized deionized water to obtain a nano-iron functional ball.

[0034]

Example Embodiment

[0035] Example 2:

[0036] (1) Preparation of cross-linking precursor solution: Add an appropriate amount of glacial acetic acid to anaerobic deionized water, and then add chitosan under constant heating and stirring conditions. After the chitosan is completely dissolved, continue heating and stirring for 4 hours. Cool to room temperature. In the aforementioned crosslinking precursor solution, the volume fraction of acetic acid is 2%, and the mass/volume percentage content of the chitosan-acetic acid solution is 4%;

[0037] (2) Preparation of nano-iron dispersion solution: use deionized water as the solvent, adjust its pH to 7, then add Tween20, nano-iron powder and 30 mesh iron scraps, and use ultrasonic to disperse the powder for 30 minutes. The dispersed solution of nano iron is obtained. In the above dispersion solution, the mass percentage content of Tween20 is 1%; the mass percentage content of the nano zero-valent iron powder is 40%; the mass percentage content of the iron scraps is 3%;

[0038] (3) Preparation of nano-iron-based functional macrospheres: at a temperature of 35℃, the cross-linking precursor solution and the dispersion solution of nano-zero-valent iron are mixed uniformly in a volume ratio of 10:1, and then the mixed solution Add dropwise to the NaOH solution to form a ball with a diameter of 3 mm, and after curing and cross-linking for 25 hours, it is washed with deoxidized deionized water to obtain nano-iron functional balls.

Example Embodiment

[0039] Example 3:

[0040] (1) Preparation of cross-linking precursor solution: add an appropriate amount of glacial acetic acid to anaerobic deionized water, add chitosan under continuous heating and stirring conditions, and continue heating and stirring for 5 hours after the chitosan is completely dissolved. Cool to room temperature. In the above-mentioned crosslinking precursor solution, the volume fraction of acetic acid is 4%, and the mass/volume percentage content of the chitosan-acetic acid solution is 6%;

[0041] (2) Preparation of nano-iron dispersion solution: use deionized water as a solvent, adjust its pH to 7, then add Tween20, nano-iron powder and 50 mesh iron scraps, and use ultrasonic to disperse the powder for 30 minutes. The dispersed solution of nano iron is obtained. In the above dispersion solution, the mass percentage content of Tween20 is 3%; the mass percentage content of the nano zero-valent iron powder is 50%; the mass percentage content of the iron scraps is 5%;

[0042] (3) Preparation of nano-iron-based functional macrospheres: at a temperature of 45℃, the cross-linking precursor solution and the dispersion solution of nano-zero-valent iron are mixed uniformly in a volume ratio of 5:1, and then the mixed solution Add dropwise to the NaOH solution to form a ball with a diameter of 3.2 mm, and after curing and cross-linking for 20 hours, it is washed with deoxidized deionized water to obtain nano-iron functional balls.

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PUM

Property	Measurement	Unit
Granularity	10.0 ~ 60.0	mesh
Diameter	0.2 ~ 6.0	mm
Diameter	3.2	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve utilization efficiency

Stable easy-separation nanoscale iron ball, preparation method thereof and application thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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