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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 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 dispersibility, its nano-scale size makes the zero-valent iron powder modified by the above means extremely difficult to use. Inconvenient, the stability of NZVI is not ideal and the utilization efficiency is not high when treating polluted sludge and water bodies, especially the treated sludge and sewage are difficult to separate from NZVI, so that it causes great harm in practical engineering applications Waste of financial and material resources, so it is difficult to use on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0031] (1) Preparation of the cross-linking precursor solution: add an appropriate amount of glacial acetic acid into anaerobic deionized water, add chitosan under continuous heating and stirring conditions, and continue heating and stirring for 3 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 1%, and the mass / volume percentage content of chitosan-acetic acid solution is 2%;

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

Embodiment 2

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

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

Embodiment 3

[0040](1) Preparation of the cross-linking precursor solution: add an appropriate amount of glacial acetic acid into 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 chitosan-acetic acid solution is 6%;

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

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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.

Description

[0001] This invention is funded by Tianjin Normal University Talent Introduction Project (5RL109), Tianjin Higher Education Science and Technology Development Fund Project (20110528) and Tianjin Normal University Municipal Key Laboratory Open Fund Project (YF11700102). technical field [0002] The invention relates to the technical field of treatment of polluted sludge and water body environment, and mainly relates to a preparation method of nano-iron functional balls which are stable and easy to separate from sewage and sludge. Background technique [0003] With the rapid development of society, the water body environment in our country is seriously polluted, and a large amount of pollutants are deposited in the sludge without timely purification and treatment. Therefore, the restoration technology of pollutants in water bodies and sludge has attracted widespread attention. . In recent years, sudden pollution incidents have occurred many times in our country, posing a grea...

Claims

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Application Information

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IPC IPC(8): B01J13/14
Inventor 柳听义王中良杨曦李勇
Owner TIANJIN NORMAL UNIVERSITY
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