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A method for preparing active filler by using hydroxyapatite, zero-valent iron and humic acid and its application

A technology of hydroxyapatite and active filler, which is applied in the restoration of polluted soil and other directions, can solve the problems of reducing the reactivity and effectiveness of zero-valent iron, unable to degrade pollutants lastingly, and reducing the possibility of engineering application, etc. To achieve the effect of improving adsorption performance, slowing down the surface passivation process and preventing oxidation

Active Publication Date: 2022-03-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A lot of research has been done on the permeable reaction wall using nano-zero-valent iron as the wall medium material as an on-site groundwater remediation technology, but nano-zero-valent iron also has the following shortcomings in the preparation and application: the large specific surface area of ​​nano-zero-valent iron and relatively large surface area. Strong magnetism makes it easy to agglomerate and form large particles during the preparation and application process, resulting in a decrease in specific surface area and activity, which greatly affects its application value; the agglomeration of nano-zero-valent iron particles can also be reduced. Its mobility in water makes the detergent diffuse unevenly, making it difficult to completely contact with pollutants, reducing the possibility of its practical engineering application; the high activity of nano-zero-valent iron also makes it easy to be absorbed by non-targets in the environment. Oxidation of pollutants (such as water and oxygen), that is, "spontaneous combustion" of nano-zero-valent iron, this phenomenon reduces the reactivity and effectiveness of zero-valent iron, and cannot permanently degrade pollutants in the environment
This method can reduce the agglomeration of zero-valent iron, but it cannot solve the problem of easy oxidation of zero-valent iron.

Method used

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  • A method for preparing active filler by using hydroxyapatite, zero-valent iron and humic acid and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Hydroxyapatite is passed through a 200-mesh sieve. Add 1 g of fulvic acid (FA ≥ 90%) and 20 mL of ammonia water into 1 L of distilled water and mix to prepare a humic acid solution. Weigh 2g of the sieved hydroxyapatite particles in 20mL humic acid solution and let it stand at room temperature for 24 hours; vacuum filter and wash with distilled water until neutral; put the obtained material in a weighing bottle and place it in the refrigerator at -20°C Freeze for 48 hours, take it out, and dry it with a freeze dryer for 5 hours. The obtained modified hydroxyapatite is stored in a sealed bag for future use.

[0031] 2) Weigh 3.18g ferrous sulfate heptahydrate and dissolve in 50mL alcohol-water mixture (V 水 :V 乙醇 =6:4), ultrasonic 5min, after stirring until completely dissolved, the ferrous sulfate solution was added in the three-necked flask, the above-mentioned modified hydroxyapatite was added in the three-necked flask, and stirred at 100 rev / min at room temperatu...

Embodiment 2

[0034] 1) Hydroxyapatite is passed through a 180-mesh sieve. Add 1 g of fulvic acid (FA ≥ 90%) and 20 mL of ammonia water into 1 L of distilled water and mix to prepare a humic acid solution. Weigh 4g of the sieved hydroxyapatite particles in 20mL humic acid solution and leave it at room temperature for 24 hours; vacuum filter and wash with distilled water until neutral; put the obtained material in a weighing bottle and place it in the refrigerator at -20°C Freeze for 60 hours, take it out and dry it with a freeze dryer for 5 hours, and store the modified hydroxyapatite in a sealed bag for future use.

[0035] 2) Weigh 6.68g ferrous sulfate heptahydrate and dissolve it in 200mL alcohol-water mixture (V 水 :V 乙醇 =6:4), ultrasonic 10min, after stirring until completely dissolved, the ferrous sulfate solution is added in the three-necked flask, the above-mentioned modified hydroxyapatite is added in the three-necked flask, stirred at 100 rev / min at room temperature 2h; Weigh 2...

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Abstract

The invention discloses a method for preparing active filler by utilizing hydroxyapatite, zero-valent iron and humic acid and its application. this invention. In the present invention, the humic acid solution is first configured, the hydroxyapatite is modified with the humic acid solution, and then the modified hydroxyapatite is reacted with ferrous sulfate heptahydrate to obtain Fe 0 ‑HAP composite; final humic acid solution with Fe 0 ‑HAP composite material is reacted to obtain composite material which is the active filler. The composite material prepared by the present invention can be used as the filler of the permeable reactive wall (PRB), which can improve the adsorption force of hydroxyapatite, and solve the problems that zero-valent iron is easy to agglomerate and easy to oxidize; It reacts with metal ions and polluting organic matter, thereby effectively repairing pollutants in soil and groundwater.

Description

technical field [0001] The invention relates to the technical field of preparation of permeable reactive wall fillers, in particular to a method for preparing active fillers by using hydroxyapatite, zero-valent iron and humic acid and its application. Background technique [0002] Permeable reactive wall (PRB) technology is an emerging technology for in-situ remediation of soil and groundwater. The reaction wall of PRB technology is placed downstream of the polluted water flow and perpendicular to the flow direction, and the reaction wall is filled with active fillers. The pollution plume flows through the reaction wall under the action of the natural hydraulic gradient, and reacts with active fillers such as adsorption, precipitation, redox, and biological action to obtain clean effluent. The key to making PRB technology work is its active filler. [0003] A lot of research has been done on the permeable reaction wall using nano-zero-valent iron as the wall medium materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 王晓东张晓慧孙先峰彭圣洁
Owner UNIV OF JINAN
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