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A method for promoting the dispersion and migration of nano ferric oxide

A ferric tetroxide and nanotechnology, applied in the field of environmental engineering, can solve the problems of easy deposition and adhesion on the surface of soil particles or trapped in the voids of soil particles, increased potential barrier, poor mobility, etc., and achieves remarkable migration performance. , Improve migration performance, environment-friendly effect

Active Publication Date: 2021-03-16
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in engineering applications, due to the influence of its own physical and chemical properties and environmental factors in aqueous solution, nanometer ferroferric oxide is very easy to agglomerate into micron-scale aggregates, and the aggregates are easy to deposit and attach to the surface of soil particles or It is trapped in the voids of soil particles, which seriously hinders the long-distance migration of nano-Fe3O4 in the polluted area, and it is difficult to realize the construction of an active reaction zone with nano-scale Fe3O4 evenly distributed.
[0004] In response to the above problems, many studies have shown that modifiers such as polyacrylic acid, humic acid, and sodium carboxymethyl cellulose can modify the surface of nano-Fe3O4, increase the steric hindrance and electrostatic repulsion between particles, and make the potential barrier increase, thereby forming a thermodynamically stable modifier-nano ferric oxide dispersion system, which solves the problem of easy aggregation of nano ferric oxide particles and poor dispersion and mobility in soil and ground water to a certain extent. However, the above dispersion The cost of the agent is high, the concentration is high, the effect is limited, and some have the risk of polluting the environment

Method used

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  • A method for promoting the dispersion and migration of nano ferric oxide
  • A method for promoting the dispersion and migration of nano ferric oxide
  • A method for promoting the dispersion and migration of nano ferric oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Weigh 0.5g xanthan gum (referred to as: XG) powder dissolve in 250 ml simulated groundwater (referred to as: AGW), stir evenly, and dispersed. The xanthan gum solution having a mass concentration of 2 g / L was obtained.

[0038] 2) Weigh 0.005 g, 0.05 g of nano-tetraned iron (referred to as: MNPS) powder, add to 250 ml of xanthan glue solution, stir even, and XG-MNPS suspension is obtained. The mass concentration of MNPS powder in suspension is 0.02 g / L, 0.2 g / L, respectively.

[0039] 3) Weigh 0.005 g, 0.05 g of MNPS powder, add to 250 ml of AGW solution, stir well, and MNPS suspension is produced. The mass concentration of MNPS powder in suspension is 0.02 g / L, 0.2 g / L, respectively.

[0040]4) When the MNPS suspension or XG-mNPS suspension is completed, settled dynamic experiments immediately, using an ultraviolet spectrophotometer, measurement of the absorbance over time at a wavelength of 720 nm, and draw relative absorbance (different The ratio of the abso...

Embodiment 2

[0044] 1) Weigh 0.5g xanthan gum (referred to as: XG) powder dissolve in 250 ml simulated groundwater (referred to as: AGW), stir evenly, and dispersed. The xanthan gum solution having a mass concentration of 2 g / L was obtained.

[0045] 2) Weigh 0.5 g, 1.0 g, 2.0 g, 3.0 g, 4.0 g, 5.0 g of nano-tetra-dioxide (referred to as: MNPS) powder, added to 250 ml of xanthan glue solution, stir well, to prepare XG-MNPS Suspension. In the suspension, the MNPs powder mass concentration was 2 g / l, 4 g / l, 8 g / l, 12 g / l, 16 g / l, 20 g / L.

[0046] 3) When the XG-MNPS suspension is completed, the settling dynamics experiment is performed immediately, and the suspension is transferred to 250 mL of the cylinder, and then sampled, sampled, sampled, and hydrochloric acid at the distance of 6cm from the liquid surface. After digestion, after MNPS is completely disinplanted, remove 1ml of solution, add acetate buffer solution to adjust the pH to 3 to 5, stand for 10 minutes, and then use th...

Embodiment 3

[0053] 1) In a glass stainless steel column of 2 cm, the length is 15 cm, and the natural quartz sand porous medium is uniformly filled, and the carbon dioxide gas is introduced into the quartz sand column to remove air. The AGW solution obtained from the bottom of the quartz sand column was performed from the bottom end of the quartz sand column until the sand column was saturated from the bottom end of the quartz sand column (the column remains constant).

[0054] 2) Weigh 0.5g xanthan adhesive (referred to as: XG) powder dissolved in 250 ml to simulate groundwater (referred to as: AGW), stir evenly, and dispersed. The xanthan gum solution having a mass concentration of 2 g / L was obtained.

[0055] 3) Weigh 0.25 g, 0.5 g, 1.0 g, 2.0 g of nano-tetraned oxide (referred to as: mnps) powder, add to 250 ml of xanthan glue solution, stir well, and XG-MNPS suspension is obtained. The MNPS powder mass concentration was 1 g / l, 2 g / l, 4g / l, 8 g / L, respectively.

[0056] 4) Weigh...

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Abstract

The invention relates to the technical field of environmental engineering, in particular to a method for promoting dispersion and migration of nano ferroferric oxide. The method includes following steps: (1), dissolving xanthan gum into water, and stirring well to prepare a dispersant of certain concentration; (2), adding nano ferroferric oxide into the dispersant in the step (1), and stirring well to obtain nano ferroferric oxide dispersion liquid of certain concentration; (3), injecting the nano ferroferric oxide dispersion liquid in the step (2) into a water containing layer soil medium tobe treated. The xanthan gum has extremely strong stabilization assistance on nano ferroferric oxide, and dispersed nano ferroferric oxide shows remarkable migration performance in the water containinglayer soil medium. The xanthan gum is a microbial metabolite and is completely biodegradable, and is more environment-friendly and lower in cost when compared with synthetic products like polyacrylicacid and sodium carboxymethylcellulose commonly used at present.

Description

Technical field [0001] The present invention relates to the field of environmental engineering, and more particularly to a method of promoting dispersion and migration of nano-tetraned oxide. Background technique [0002] With the continuous development of human society, the population has increased dramatically, and more and more organic matter is applied to industrial and agricultural production and daily life, they are not neglected by the pollution of soil groundwater, especially difficult to degrade organic pollutants. Many studies have shown that nano-eadoxide can effectively activate sulfate to produce sulfate free radicals and hydroxyl radicals, which can quickly oxidize the organic matter to achieve the purpose of removing the organic matter in water. Nano-four oxide three iron is relatively stable in the environment, not easy to passivate inactivation, and can be present in the underground aqueous layer and continuously activate sulfate oxidation degradation organic pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/72C02F2101/30
Inventor 钟华刘观胜
Owner WUHAN UNIV
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