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A method for microwave graphene-enhanced sodium percarbonate to degrade soil organic pollutants

A technology of organic pollutants and sodium percarbonate, which is applied in the field of soil remediation of organic polluted sites, can solve the problems of low microwave utilization rate and slow rise of soil medium temperature, and achieve high energy utilization efficiency, good electronic conductivity, and free radical generation powerful effect

Active Publication Date: 2020-07-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low microwave utilization rate and slow rise of soil medium temperature due to the lack of microwave absorbing substances such as iron manganese compounds in the traditional microwave advanced oxidation reaction when treating organic polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Weigh 2.00g of sodium percarbonate and 0.025g of graphene, add 100ml of distilled water, fully dissolve and mix to obtain a mixture of graphene and sodium percarbonate;

[0032] 2. Add the mixed solution of graphene and sodium percarbonate to 100 g of phthalate-contaminated soil with a concentration of 20 mg / kg and fully mix to obtain a mixed material;

[0033] 3. Put the mixed material into a frequency conversion microwave reactor, set the temperature at 80°C, and react for 20 minutes;

[0034] 4. Take out the mixed material, put it in a freeze dryer, set the temperature to -45°C, and vacuum to 18Pa. After 8 hours, the dry mixture is obtained. Weigh 10g of the dry mixture and add 60ml of dichloromethane and acetone extractant, set Ultrasonic power 35kHz, ultrasonic 30min, take the supernatant and rotary evaporate to 1ml on-machine detection concentration.

[0035] 5. Take out the mixed material to measure the concentration of phthalates in the soil. The concentratio...

Embodiment 2

[0037] 1. Weigh 4.00g of sodium percarbonate and 0.10g of graphene, add 100ml of distilled water, dissolve and mix to obtain a mixture of graphene and sodium percarbonate;

[0038] 2. Add the mixed solution of graphene and sodium percarbonate to 200 g of phthalate-contaminated soil with a concentration of 26 mg / kg, and fully mix to obtain a mixed material;

[0039] 3. Put the mixture into a frequency conversion microwave reactor, set the temperature at 85°C, and react for 15 minutes;

[0040] 4. Take out the mixed material, place it in a freeze dryer, set the temperature to -50°C, and vacuum to 22Pa. After 10 hours, the dry mixture is obtained. Weigh 10g of the dry mixture and add 60ml of dichloromethane and acetone extractant, set Ultrasonic power 35kHz, ultrasonic 60min, remove the supernatant and rotary evaporate to 1ml on-machine detection concentration.

[0041] 5. Take out the mixture and measure the concentration of phthalates in the soil. The concentration of phthala...

Embodiment 3

[0043] 1. Weigh 2.50g of sodium percarbonate and 0.10g of graphene, add 100ml of distilled water, dissolve and mix to obtain a mixture of graphene and sodium percarbonate;

[0044] 2. Add the mixed solution of graphene and sodium percarbonate to 100 g of phthalate-contaminated soil with a concentration of 24 mg / kg, and fully mix to obtain a mixed material;

[0045] 3. Put the mixture into a frequency conversion microwave reactor, set the temperature at 65°C, and react for 10 minutes;

[0046] 4. Take out the mixed material, put it in a freeze dryer, set the temperature to -45°C, and vacuum to 18Pa. After 8 hours, the dry mixture is obtained. Weigh 10g of the dry mixture and add 60ml of dichloromethane and acetone extractant, set Ultrasonic power 30kHz, ultrasonic 60min, take the supernatant rotary evaporation to 1ml on the machine to detect the concentration.

[0047] 5. Take out the mixture and measure the concentration of phthalates in the soil. The concentration of phthal...

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PUM

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Abstract

The invention discloses a method for degrading organic pollutants in soil by microwave-graphene-strengthened sodium percarbonate. The method comprises the steps: adding 0.25-1.0g / L of grapheme into a sodium percarbonate solution with the mass concentration being 2-4%, adding the sodium percarbonate and grapheme mixed solution into the organically-polluted soil, uniformly stirring, putting into a variable-frequency microwave reactor, setting the temperature as 65-85 DEG C, and sustaining reaction for 10-20 minutes. The method is suitable for remediating the site polluted by persistent organic pollutants such as phthalic acid ester, polychlorinated biphenyl, etc., the removal rate for the organic pollutants can reach above 80.7%, and the method has an important application value.

Description

technical field [0001] The invention belongs to the technical field of soil remediation of organic polluted sites, and more specifically relates to a method for microwave graphene-enhanced sodium percarbonate to degrade soil organic pollutants. Background technique [0002] According to the "China Environmental Yearbook" (2002-2009), the number of closed and transferred industrial enterprises in my country increased from 6,611 in 2001 to 22,488 in 2008, with a total of more than 100,000, mainly concentrated in Beijing, Tianjin, the Yangtze River Delta, Pearl River Delta and Northeast Old Industrial Base and other regions. Although the relocation of enterprises has ended the continuous discharge of pollutants, the pollution to soil and groundwater has existed for a long time. During the secondary development of land, pollution incidents caused by poor management of polluted sites are common, such as the "Love Canal Incident in the United States", " Beijing Songjiazhuang Subwa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
CPCB09C1/00
Inventor 林亲铁郑友平姜洁如陈志良
Owner GUANGDONG UNIV OF TECH
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