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Method for degrading naphthalene in soil through combination of microwave induction and catalytic oxidation

A technology of synergistic catalysis and oxidative degradation, applied in the field of environmental organic pollutants remediation, can solve the problems of being easily restricted by environmental factors and climatic conditions, the long-term restoration period of bioremediation methods, and the inability to achieve restoration effects, so as to promote oxidative decomposition. ability, improve mineralization and decomposition ability, and the effect of fast oxidation

Active Publication Date: 2020-04-07
上海达恩贝拉环境科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical remediation method is usually the transfer of pollutants from one solid substance to another solid substance, which cannot achieve a complete restoration effect; the bioremediation method has a long repair cycle and is easily restricted by environmental factors and climatic conditions; the chemical remediation method Usually need to add metal oxidant, the reaction conditions are harsh, easy to cause secondary pollution

Method used

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  • Method for degrading naphthalene in soil through combination of microwave induction and catalytic oxidation
  • Method for degrading naphthalene in soil through combination of microwave induction and catalytic oxidation
  • Method for degrading naphthalene in soil through combination of microwave induction and catalytic oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Take uncontaminated fresh soil samples, add 50mL of ethanol solution with a concentration of 1mg / L naphthalene (preparation of ethanol stock solution of 100mg / L naphthalene, and then dilute it to 1mg / L), stir well, and place in a fume hood The ethanol solution was volatilized cleanly, and then passed through a 2mm sieve to ensure that the soil was uniformly contaminated, and a soil sample contaminated with naphthalene, a polycyclic aromatic hydrocarbon, could be obtained, with a concentration of 10mg / kg.

[0039] Weigh 5g of the above uniformly poisoned soil samples, add 50mg of biochar, carbon nitride, potassium-doped carbon nitride, and biochar-loaded potassium-doped carbon nitride, then add 1g of distilled water, mix well and put in poly In the vinyl fluoride reactor, put it in a microwave digestion apparatus for degradation. The microwave treatment time is 2min, 4min, 6min, 8min, 10min respectively, the microwave frequency is 2450MHz, the output power is 400-700W, an...

Embodiment 2

[0042] Take uncontaminated fresh soil samples, add 50mL of ethanol solution with a concentration of 1mg / L naphthalene (preparation of ethanol stock solution of 100mg / L naphthalene, and then dilute it to 1mg / L), stir well, and place in a fume hood The ethanol solution was volatilized cleanly, and then passed through a 2mm sieve to ensure that the soil was uniformly contaminated, and a soil sample contaminated with naphthalene, a polycyclic aromatic hydrocarbon, could be obtained, with a concentration of 10mg / kg.

[0043] Weigh 5g of the above uniformly poisoned soil samples, add 10mg of biochar, carbon nitride, potassium-doped carbon nitride, biochar-loaded potassium-doped carbon nitride, and then add 0.6g, 0.7g, 0.8g, 0.9g, 1.0g of distilled water, mix them evenly, put them into a polytetrafluoroethylene reactor, place them in a microwave digestion apparatus for degradation, the microwave treatment time is 8min, the microwave frequency is 2450MHz, the output power is 400-700W, ...

Embodiment 3

[0046] Take uncontaminated fresh soil samples, add 50mL of ethanol solution with a concentration of 1mg / L naphthalene (preparation of ethanol stock solution of 100mg / L naphthalene, and then dilute it to 1mg / L), stir well, and place in a fume hood The ethanol solution was volatilized cleanly, and then passed through a 2mm sieve to ensure that the soil was uniformly contaminated, and a soil sample contaminated with naphthalene, a polycyclic aromatic hydrocarbon, could be obtained, with a concentration of 10mg / kg.

[0047] Weigh 5g of the above uniformly poisoned soil samples, add biochar, carbon nitride, potassium-doped carbon nitride, and biochar-supported potassium-doped carbon nitride catalysts, respectively, and add 10mg, 20mg, 30mg, 40mg, 50mg, add 0.6g distilled water to each sample, mix evenly, put it into a polytetrafluoroethylene reactor, and place it in a microwave digestion apparatus for degradation. The microwave treatment time is 8min respectively, and the microwave ...

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Abstract

The invention discloses a method for degrading naphthalene in soil through the combination of microwave induction and catalytic oxidation. The method is characterized by comprising the following steps: mixing 5g of naphthalene-polluted soil sample, 10-50mg of catalyst and 0.6-1.0 g of distilled water, adding the above materials into a polytetrafluoroethylene reactor, and degrading the materials ina microwave digestion instrument for degradation, wherein the concentration of the soil sample is that 10mg of naphthalene is contained in every 1kg of soil, the microwave frequency is 2450MHz, the output power is 400-700W, the output pressure is 0.2 Mpa, and the microwave induction treatment time is 2-10min. A single microwave induction method and a catalytic oxidation method are combined, and the purpose of degrading polycyclic aromatic hydrocarbon in the soil through the combination of microwave induction and catalytic oxidation. The method is simple and easy to implement and has a good degradation effect on the refractory typical pollutant polycyclic aromatic hydrocarbon naphthalene in the soil.

Description

technical field [0001] The invention belongs to the technical field of environmental organic pollutant restoration, and in particular relates to a method for microwave-induced synergistic catalytic oxidation degradation of naphthalene in soil. Background technique [0002] After entering the soil, polycyclic aromatic hydrocarbons can stick together with soil particles, increase soil bulk density, reduce soil porosity, reduce soil permeability, reduce microbial diversity, affect microbial activity, and even cause crop production reduction. Among them, polycyclic aromatic hydrocarbons also have three effects of persistence, high toxicity, carcinogenicity, teratogenicity, and mutagenicity, which seriously endanger environmental quality and human health. As a representative substance of polycyclic aromatic hydrocarbons, naphthalene is one of the "national environmental priority control of toxic organic substances". Long-term human exposure, if not treated in time, will endanger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李法云吝美霞
Owner 上海达恩贝拉环境科技发展有限公司
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