Method for repairing polycyclic aromatic hydrocarbon contaminated soil by using g-C3N4/TiO2 composite material

A technology for polycyclic aromatic hydrocarbons and polluted soil, applied in the field of soil remediation, can solve the problems of long remediation period of bioremediation technology, insufficient utilization of sunlight, less application of photocatalytic technology, etc., and achieve excellent chemical stability and promote diffusion mobility. , to achieve the effect of economic benefits

Inactive Publication Date: 2020-09-22
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bioremediation technology is easily limited by the types of biological strains, culture period and the properties of polycyclic aromatic hydrocarbons. In addition, bioremediation technology often has a long repair period.
[0005] However, the application of photocatalytic technology in the field of soil remediation is less
There are two main reasons why photocatalytic technology is not taken seriously in the field of soil remediation: (1) Typical photocatalysts such as TiO 2 , ZnO, etc. can only have catalytic ability under ultraviolet light, but there are only less than 5% of ultraviolet light in sunlight, and the utilization rate of sunlight is insufficient; (2) photocatalysts are mainly composed of metal-based oxides, sulfides Or salt composition, once heavy metals enter the soil, there is a risk of secondary pollution

Method used

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  • Method for repairing polycyclic aromatic hydrocarbon contaminated soil by using g-C3N4/TiO2 composite material
  • Method for repairing polycyclic aromatic hydrocarbon contaminated soil by using g-C3N4/TiO2 composite material

Examples

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Effect test

Embodiment 1

[0037] This embodiment relates to a g-C 3 N 4 / TiO 2 A method for remediating PAH-contaminated soil with composite materials, including

[0038] Before remediating PAH pollution, first prepare the photocatalyst g-C 3 N 4 / TiO 2 . g-C 3 N 4 / TiO 2 Wherein a kind of preferred preparation method is as follows, specifically comprises the following steps

[0039] first g-C 3 N 4 Preparation: Put melamine in a covered crucible and bake at 550°C for 3 hours. The roasted product was ultrasonically oscillated in a mixed solution of ethanol and water (volume ratio 1:2) for 2 hours, and after solid-liquid separation, it was dried to obtain g-C 3 N 4 .

[0040] followed by g-C 3 N 4 / TiO 2 Preparation of: TiO 2 with g-C 3 N 4 The ratio is determined according to the concentration of polycyclic aromatic hydrocarbons in the soil. When the concentration of polycyclic aromatic hydrocarbons does not exceed 50mg / kg, TiO 2 with g-C 3 N 4 The ratio is controlled between 5% ...

Embodiment 2

[0048] This embodiment relates to a g-C 3 N 4 / TiO 2 Characterization of composite materials for remediation of polycyclic aromatic hydrocarbon-contaminated soils.

[0049] The quartz sand is used instead of the actual soil sample as the matrix, and the artificially polluted soil is repaired by means of simulation. First, the quartz sand is passed through a 50-mesh soil sieve, divided into 50g samples each, and mixed with benzo(a) anthracene, benzo(a) pyrene, benzo(b) fluoranthene, indeno(1,2,3-cd) Pyrene and dibenzo(a, h)anthracene mixed standard solutions were added to quartz sand to prepare 10mg / kg, 50mg / kg, and 100mg / kg respectively, and PAH-contaminated soil was naturally dried in the shade for 24 hours.

Embodiment 21

[0051] (1) Preparation of photocatalyst g-C 3 N 4 / TiO 2 . First prepare g-C 3 N 4 : Put the melamine in a covered crucible and bake it at 550°C for 3 hours. The roasted product was ultrasonically oscillated in a mixed solution of ethanol and water (volume ratio 1:2) for 2 hours, and after solid-liquid separation, it was dried to obtain g-C 3 N 4 . Next prepare g-C 3 N 4 / TiO 2 : TiO 2 with g-C 3 N 4 According to the mass ratio of 5% in the mixed solution of ethanol and water (volume ratio 1:2) ultrasonic vibration mixing, solid-liquid separation, drying to obtain g-C 3 N 4 / TiO 2 composite material.

[0052] (2) Photocatalyst g-C 3 N 4 / TiO 2 Applied to remediation of PAH-contaminated soil.

[0053] Step 1, take 10g prepared 10mg / kg polycyclic aromatic hydrocarbon contaminated quartz sand sample, test the type and content of polycyclic aromatic hydrocarbons, determine the concentration of pollutants, in this example, benzo(a) anthracene, benzo(a) Pyrene, ...

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Abstract

The invention provides a method for repairing polycyclic aromatic hydrocarbon contaminated soil through a g-C3N4 / TiO2 composite material. The method comprises a step of pretreating the polycyclic aromatic hydrocarbon contaminated soil, namely a step of removing foreign matters, grinding, smashing and sieving; a step of testing the variety and content of the polycyclic aromatic hydrocarbons to determine the pollutant concentration; a step of mixing g-C3N4 / TiO2 with the polycyclic aromatic hydrocarbon contaminated soil, uniformly stirring, and flattening to form a soil layer; a step of irradiating the flattened soil layer under a light source; after illumination, turning and stirring the soil layer. According to the soil remediation method, pollution of five polycyclic aromatic hydrocarbon substances including benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, indeno(1,2,3-cd) pyrene and dibenzo(a,h)anthracene in the soil can be effectively reduced, and the concentration of corresponding substances in the final soil reaches a risk management and control standard value. The method is easy to implement, the treatment period is short, the effect is remarkable, and economic benefits, environmental benefits and social benefits can be effectively achieved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a g-C 3 N 4 / TiO 2 Composite materials for remediation of PAH-contaminated soils. Background technique [0002] Soil is an important resource for human survival and development. Once the soil is polluted, the pollutants in the soil will cause secondary pollution to surface water and groundwater. Pollutants in the soil will enter the human body through the food chain through drinking water or the soil-plant system, directly endangering human health. At the same time, the state has greatly increased its emphasis on soil environmental pollution. The Ministry of Ecology and Environment (formerly the Ministry of Environmental Protection), the Ministry of Natural Resources (formerly the Ministry of Land and Resources) and other relevant departments have issued the "Environmental Protection Law of the People's Republic of China", "Soil Pollution Prevention and Control Law" ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 车凯刘克成郁金星牛向楠侯海萍宫云茜陈秋
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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