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Double-metal macromolecule permeable reactive barrier stuffing material and preparation method thereof

A permeable reaction wall and bimetallic technology, applied in chemical instruments and methods, chemical/physical/physicochemical processes, chemical/physical processes, etc., can solve the problem of inability to fully utilize the specific surface area of ​​zero-valent iron and the formation of nano-scale bimetallic particles Poor performance, unable to meet the strength requirements of engineering applications, etc., to achieve the effect of extremely high chromium removal efficiency, strong Cr(VI) removal ability, and solve the problem of filler strength

Inactive Publication Date: 2014-12-17
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also failed to change the shortcomings of nano-zero-valent iron, which is easy to oxidize and fail in practical engineering applications, and the cost is high, and the emulsification attitude of nano-scale bimetallic particles has poor formability and low strength, so it is not suitable for large-scale engineering applications.
Therefore, simply using bimetal or reducing the particle size of iron powder and simply using wrapping materials to treat Cr(VI) cannot make full use of the specific surface area of ​​zero-valent iron, cannot meet the strength requirements of engineering applications, and the treatment effect is still not significant. , there is still a certain gap from large-scale engineering applications

Method used

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  • Double-metal macromolecule permeable reactive barrier stuffing material and preparation method thereof
  • Double-metal macromolecule permeable reactive barrier stuffing material and preparation method thereof
  • Double-metal macromolecule permeable reactive barrier stuffing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Take 1-3mm volcanic rock and wash it with distilled water for 3 times, then put it in a constant temperature drying box and dry it at 110°C for later use; take 200 mesh zero-valent iron powder with a purity of 98%, wash it with 0.5mol / L hydrochloric acid, and then wash it with water for 3 times until medium After drying, take out the wet iron powder and dry it for later use; put the above iron powder in CuCl 2 Metal Cu with a mass fraction of 1% was plated on the solution through a displacement reaction. After 30 minutes of reaction, the wet bimetal was taken out and placed in a constant temperature drying oven at 40°C for 6 hours. Add to 100mL distilled water, stir well, heat and dissolve at a constant temperature of 85°C, and set aside after the dissolution is complete; weigh 0.505g of bimetallic particles, add them to the prepared sodium alginate solution, and stir at high speed to disperse the bimetallic particles in the solution ;Add volcanic rock to the mixed solu...

Embodiment 2

[0053] The difference from Example 1 is:

[0054] Place the above iron powder in CuCl 2 Metal Cu with a mass fraction of 15% was plated in the solution through a displacement reaction, and after 30 minutes of reaction, the wet bimetal was taken out and placed in a constant temperature drying oven at 40°C for 6 hours, and 0.588 g of bimetal particles were weighed. Ratio and manufacturing process are identical with embodiment 1.

[0055] The fillers prepared in this example and the fillers used for experimental comparison (15% bimetallic copper plating, 15% volcanic rock+sodium alginate wrapped bimetallic particles) were all added to the Cr(VI ) waste water, the zero-valent iron content in all the above-mentioned fillers is 0.5g, and the experimental results are shown in Table 2.

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Abstract

The invention relates to a double-metal macromolecule permeable reactive barrier stuffing material, which can effectively remove the pollution of Cr (VI) in underground water. A preparation method of the stuffing material comprises the following steps of: 1) plating metal copper on the surface of zero-valence iron power by a replacement reaction, to prepare the double-metal particles of zero-valence iron power and metal copper; 2) dispersing the double-metal particles into sodium alginate tech grade solution to prepare into a mixed solution, and loading the mixed solution on an inorganic carrier; and 3) adding the product of the step 2) into a CaCl2 solution to be immobilized, to prepare the double-metal macromolecule permeable reactive barrier stuffing material. The product disclosed by the invention is high in strength and permeability, the specific surface area of the zero-valence iron power can be adequately utilized, and the problems of hardening, passivating and blocking generated by the reaction between the zero-valence iron and the Cr (VI), the low use ratio of the iron power and the like can be effectively solved.

Description

technical field [0001] The invention relates to a bimetallic polymer filler used in the osmotic reaction wall technology for removing Cr(VI) pollution from groundwater, and relates in detail to a filler using sodium alginate to wrap iron-copper bimetal. [0002] The present invention also relates to a method for preparing the above-mentioned filler. Background technique [0003] Heavy metal pollution of water and soil is one of the severe environmental problems facing today, among which Cr(VI) is a "three-caused" pollutant that has been confirmed by research. my country's "Drinking Water Quality Standards" stipulates that the Cr(VI) standard is ≤0.05mg / L. Cr(VI) in groundwater in many places in my country has seriously exceeded the standard. For example, the concentration of hexavalent chromium in groundwater caused by extensive production in Qinghai Haibei Chemical Plant reached 1147mg / L, and the concentration of hexavalent chromium in groundwater caused by Qingdao Hongxin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/30
Inventor 王兴润朱文会王琪
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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