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A kind of preparation method of zero-valent iron ball

A technology of nano-zero-valent iron and iron balls, which is applied in the direction of nanotechnology, can solve the problems that nano-zero-valent iron cannot guarantee effective contact reaction, the processing efficiency of the treatment system is reduced, and nano-iron powder is difficult to separate, so as to achieve rapid decontamination Physical performance, high efficiency removal efficiency, and low cost of ball making

Active Publication Date: 2017-03-15
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this solid loading technology has the shortcoming of complicated experimental conditions; 2. Nano zero-valent iron powder is packed in the container (as reaction column, osmotic reaction grid), makes the solution containing pollutant flow through reaction column to remove pollutant
But there are disadvantages of inconvenient operation and construction in practical application
[0009] On the other hand, the loss under the scouring effect of water will cause the nano-zero-valent iron to fail to ensure the effective contact reaction with pollutants, resulting in a reduction in the processing efficiency of the treatment system and a waste of materials, and the outflow of nano-iron powder is also very Difficult to separate from treated water, causing secondary pollution

Method used

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  • A kind of preparation method of zero-valent iron ball
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  • A kind of preparation method of zero-valent iron ball

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A method for preparing zero-valent iron balls, comprising:

[0067] Ⅰ. Preparation of air-stable guar gum nanometer zero-valent iron powder:

[0068] A, prepare guar gum solution

[0069] Add food-grade guar gum solid powder into ultrapure water, then heat and stir to dissolve, and obtain a mass percentage of 0.05%.

[0070] of guar gum solution.

[0071] B. Deoxygenation

[0072] In a three-necked flask, 0.2780g FeSO 4 ·7H 2 O was mixed with 30ml of the above-mentioned guar gum solution, then passed into nitrogen deoxygenation for 20-40min, and mechanically stirred for 5-10min so as to mix uniformly to obtain a mixed solution;

[0073] C. Preparation of nano-iron solution

[0074] Weigh 0.2160g of KBH 4Add dropwise 1ml of NaOH solution with a concentration of 0.5mol / L, then add 20ml of the above-mentioned guar gum solution, and react for 30min under mechanical stirring to obtain a black nano-zero-valent iron solution;

[0075] D. Preparation of nano-sized zero-...

Embodiment 21

[0083] A method for preparing zero-valent iron balls. The difference from Example 1 is that the prepared iron balls are soaked in a deoxygenated absolute ethanol solution and stabilized for 12 hours after forming the balls.

Embodiment 22

[0085] A method for preparing zero-valent iron balls. The difference from Example 1 is that the prepared iron balls are immediately soaked in a deoxygenated absolute ethanol solution and stabilized for 18 hours after forming the balls.

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Abstract

The invention relates to a preparation method of a zero-valent iron ball. The preparation method comprises steps of preparing nanoscale zero-valent iron powder with stabilized guar gum, and utilizing nanoscale zero-valent iron powder with stabilized guar gum to prepare the zero-valent iron ball. The invention further relates to the preparation method of the zero-valent iron ball. The preparation method comprises steps of preparing pumice nanoscale zero-valent iron powder with stabilized guar gum and utilizing pumice nanoscale zero-valent iron powder with stabilized guar gum to prepare the zero-valent iron ball.The preparation method of the zero-valent iron ball is easy and feasible at low cost. High performance stability of the zero-valent iron ball is obtained. The preparation method of the zero-valent iron ball has following beneficial effects: the zero-valent iron ball prepared by the preparation method helps to overcome limitations such as recovery difficulty and proneness of losing the present nano zero-valent iron powder in the practical engineering application and can functions as a filler for sewage, rainwater, reclaimed water and other percolation treatment facilities in order to remove a plurality of pollutants including degradation-resistant micro-pollutants in water.

Description

technical field [0001] The invention belongs to the technical field of processing heavy metals in water pollution, and in particular relates to a method for preparing zero-valent iron balls. Background technique [0002] The rapid process of urbanization has led to increasingly serious urban water pollution problems. Different from nitrogen, phosphorus and other substances, heavy metals and petroleum pollutants (such as polycyclic aromatic hydrocarbons, PAHs) are difficult to degrade, and can cause cumulative damage to the environment and human body, which is very harmful. When the pollutant content exceeds the self-purification ability of the water body, it will cause the accumulation of pollutants and lead to the deterioration of water quality. How to efficiently remove refractory pollutants in water bodies and ensure water environment and human health and safety has become a hot issue today. [0003] Nanoscale zero-valent iron (nZVI) is a new type of artificial material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
Inventor 李海燕格屿张晓然黄延
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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