Activated carbon lanthanum-loaded aluminum soil fluorine pollution repairing agent as well as preparation method and repairing method thereof

A technology of pollution remediation and remediation method, which is applied in the field of activated carbon-supported lanthanum aluminum soil fluorine pollution remediation agent and its preparation, achieving the effects of simple preparation method, reduction of energy consumption and application cost, and remediation of fluorine pollution

Pending Publication Date: 2020-11-10
中铝环保节能集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the present invention provides a soil fluorine pollution remediation agent loaded with lanthanum and aluminum on activated carbon and its preparation method and repair method, to solve the above-mentioned problems existing in the existing soil fluorine pollution remediation agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of an activated carbon-loaded lanthanum-aluminum soil fluorine pollution remediation agent comprises the following steps:

[0038] S1: 120.71g AlCl 3 ·6H 2 O and 150.74 g LaCl 3 ·7H 2 O was dissolved in 500mL deionized water respectively, and mixed evenly after completely dissolving to obtain 1000mL Al 3+ and La 3+ A mixture with a concentration of 0.5mol / L;

[0039] S2: Take 24g of activated carbon and immerse in the mixed solution described in step S1, immerse for 24h and then ultrasonically oscillate for 1h;

[0040] S3: Add 3mol / L NaOH solution to the mixture treated in step S2, and adjust the pH to 7.5;

[0041] S4: shake and mix the mixture after adjusting the pH value at 60° C., and age for 24 hours;

[0042] S5: Centrifuge the aged mixture in a centrifuge with a rotating speed of 4000rpm, wash it with deionized water three times, dehydrate and dry at 80°C for 48 hours to obtain a soil fluoride pollution remediation agent loaded with l...

Embodiment 2

[0044] A preparation method of an activated carbon-loaded lanthanum-aluminum soil fluorine pollution remediation agent comprises the following steps:

[0045] S1: 241.43g AlCl 3 ·6H 2 O and 301.47g LaCl 3 ·7H 2 O was dissolved in 500mL deionized water respectively, and mixed evenly after completely dissolving to obtain 1000mL Al 3+ and La 3+ A mixture with a concentration of 1mol / L;

[0046] S2: Take 24g of activated carbon and immerse in the mixed solution described in step S1, immerse for 24h and then ultrasonically oscillate for 1h;

[0047] S3: Add 6mol / L NaOH solution to the mixture treated in step S2, and adjust the pH to 8;

[0048] S4: shake and mix the mixture after adjusting the pH value at 60° C., and age for 24 hours;

[0049] S5: Centrifuge the aging mixture in a centrifuge at a speed of 3000 rpm, wash it with deionized water three times, dehydrate it and dry it at 75°C for 45 hours to obtain a soil fluorine pollution remediation agent loaded with lanthanum...

Embodiment 3

[0051] The remediation method of the activated carbon-carrying lanthanum aluminum soil fluorine pollution remediation agent that embodiment 1 obtains comprises the steps:

[0052] Add 15% remediation agent for high-fluorine-contaminated soil to high-fluorine-contaminated soil with a water-soluble fluorine content of 120 mg / kg, mix well, and then add deionized water to obtain a mixture with a solid-to-liquid ratio of 2:1;

[0053] The mixture was cured, the curing temperature was 22°C, and the humidity was 85%; samples were taken on the 2d, 15d, and 30d of the curing, and the samples were naturally air-dried; after drying, they were soaked in deionized water in a constant temperature shaking incubator. Extraction, the extraction liquid is deionized water, the solid-liquid ratio during the extraction process is 1:10, the oscillation speed is 150rpm, the temperature is 22°C, and the time is 2h; after the extraction is completed, the solid-liquid separation is carried out in a cent...

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Abstract

The invention discloses an activated carbon lanthanum-loaded aluminum soil fluorine pollution repairing agent as well as a preparation method and a repairing method thereof, and relates to the technical field of soil improvement. The preparation method comprises the following steps: S1, mixing an Al < 3 + > solution and a La < 3 + > solution in equal proportion to obtain a mixed solution with Al <3 + > and La < 3 + > concentrations of 0.5-1 M; S2, dipping activated carbon into the mixed solution obtained in the step S1, and carrying out ultrasonic oscillation after dipping is completed; S3, adding a NaOH solution into the mixture treated in the step S2 for adjusting the pH value to 7-8, and oscillating and uniformly mixing the mixture after the pH regulation at a certain temperature, andaging the mixture; S4 centrifuging, cleaning, dehydrating and drying the aged mixture to obtain the activated carbon lanthanum-loaded aluminum soil fluorine pollution repairing agent. The remediationagent prepared by the preparation method can be used in high-fluorine-content contaminated soil, wherein the content of water-soluble fluorine in the soil can be effectively reduced, and the reductionrate of the water-soluble fluorine reaches 91% or above.

Description

technical field [0001] The invention relates to the technical field of soil improvement, in particular to an active carbon-supported lanthanum-aluminum soil fluorine pollution remediation agent and a preparation method and a remediation method thereof. Background technique [0002] Fluorine pollution usually comes from industries such as smelting, chemical fertilizers, building materials, and chemicals. Industrial production leads to high-concentration fluoride ion emissions, which in turn increases the fluorine content of crops, water bodies, the atmosphere, and soil. Fluorine can enter the human body through the food chain, breathing and drinking water. It is an important component of bone and tooth development. A small amount of fluorine can promote the growth and development of children and prevent dental caries; Potential threats, ranging from dental fluorosis to severe skeletal fluorosis. Therefore, the form, content and biological effect of fluorine in the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/08
CPCB09C1/08C09K17/08
Inventor 杜心范传芳周晓峰颜珣畅拓崔岩山尹乃毅杨玉婷陈龙
Owner 中铝环保节能集团有限公司
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