A kind of self-diffusion nano iron composite material and its preparation method and use

Abstract

The invention relates to a self-diffusing nano-iron composite material, a preparation method and application thereof. The self-diffusing nano-iron composite material of the present invention is fixed with a high-pressure inert gas, and the self-diffusing nano-iron composite material is dissolved in water and releases The inert gas generates thrust and improves the diffusivity of the self-diffusing nano-iron composite, thereby expanding the range of its degradation of pollutants in water; and the presence of carbohydrate components prevents the agglomeration and oxidation of nano-iron, and the dissolved carbohydrate components Fractionation can also provide a carbon source for microorganisms, which is conducive to enhancing the ability of microorganisms to degrade target pollutants.

Description

technical field [0001] The invention relates to the field of nano-iron materials, in particular to a self-diffusion nano-iron composite material and its preparation method and application. Background technique [0002] As an important resource for people's survival and development, groundwater pollution has become one of the most important environmental problems facing my country's ecological environment and human health, and has attracted more and more attention. Compared with surface water, groundwater pollution often occurs in mobile underground aquifers, which are difficult to detect. Long-term pollutants will promote the continuous expansion of pollution plumes; in addition, due to the diversity of human activities, once the aquifer is polluted, it is often accompanied by Various forms of compound pollution have led to the difficulty and high cost of groundwater pollution. At present, the common groundwater sewage remediation methods at home and abroad mainly include t...

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Problems solved by technology

However, when the above-mentioned modified nano-iron is injected into the underground aquifer, the nano-iron will still preferentially settle and migrate downward under the action of gravity, and the amount of horizontal migration is limited, resulting in a reduction in the repair range of the nano-iron

In addition, nano-iron bypasses poorly permeable aquifer areas and preferentially passes through better permeable aquifers, ie preferential flow, resulting in incomplete remediation

[0005] CN107199013A discloses a method for preparing magnetic biochar-supported nano-iron, including: (1) modified biochar; (2) ultrasonic impregnation method for loading iron salt; (3) coating tea polyphenol; (4) liquid phase reduction (5) The magnetic separation method separates the magnetic biochar-supported nano-iron. This scheme has the problem of poor diffusion ability of the prepared magnetic biochar-supported nano-iron in water.

[0006] CN107456997A discloses a nano-iron-palladium resin for deoxidizing industrial water, which consists of a resin carrier and nano-active metal palladium and iron loaded on the resin, the weight percentage of metal palladium is 0.2-1%, and the metal iron The percentage content is 0.1-0.5%, and the resin is anion exchange resin, cation exchange resin or adsorption resin, and the resin particle size is 0.5-2mm. The nano-iron-palladium resin material described in this scheme also has the problem of poor diffusion ability in water

[0007] The main problem with the above-mentioned modification methods is that all the moving processes of nano-iron in the water body are "passive" and do not have "active" moving ability, thus limiting its moving performance. The "active" means that the material can generate Physical or chemical changes drive the movement of materials, so it is still of great significance to develop a self-diffusion nano-iron composite with "active" mobility in water and its preparation method

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