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Application of g-C3N4/Fe3O4 composite material to polycyclic aromatic hydrocarbon contaminated soil remediation

A polycyclic aromatic hydrocarbon and composite material technology, applied in the field of soil remediation, can solve the problems of insufficient utilization of sunlight, secondary pollution, unsatisfactory photocatalytic activity, etc., and achieve excellent visible light absorption performance and reduce toxicity.

Active Publication Date: 2018-10-16
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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
pure g-C 3 N 4 It has the disadvantages of poor conductivity and high recombination rate of photogenerated electrons and holes, which makes its photocatalytic activity unsatisfactory.
However, there are no reports of related applications

Method used

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  • Application of g-C3N4/Fe3O4 composite material to polycyclic aromatic hydrocarbon contaminated soil remediation
  • Application of g-C3N4/Fe3O4 composite material to polycyclic aromatic hydrocarbon contaminated soil remediation
  • Application of g-C3N4/Fe3O4 composite material to polycyclic aromatic hydrocarbon contaminated soil remediation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Under visible light, g-C 3 N 4 / Fe 3 o 4 Composite materials used in Philippine contaminated soil remediation

[0048] g-C 3 N 4 / Fe 3 o 4 A method for repairing phenanthrene-contaminated soil with composite materials

[0049] (1) The phenanthrene-contaminated soil sampled from the polluted plots has been tested for a phenanthrene content of 300 mg phenanthrene / kg soil.

[0050] (2) Air-dry the appropriate amount of PAH-contaminated soil naturally for about a week. Subsequently, the soil was crushed and crushed. Sieve the pulverized soil with a 60-mesh soil sieve to obtain soil particles;

[0051] (3) Fe 3 o 4 Nanoparticles and g-C 3 N 4 Mix according to the mass ratio of 1:100, ultrasonically oscillate and mix for 2 hours in the mixed solution of ethanol and water (volume ratio 1:2), after solid-liquid separation, dry to obtain g-C 3 N 4 / Fe 3 o 4 composite material.

[0052] figure 1 for g-C 3 N 4 , Fe 3 o 4 and g-C 3 N 4 / Fe 3 o 4 XRD spec...

Embodiment 2

[0067] In sunlight, g-C 3 N 4 / Fe 3 o 4 Application of composite materials in remediation of high-concentration phenanthrene-contaminated soil

[0068] (1) In the phenanthrene-contaminated soil sampled from the polluted land, the phenanthrene content was as high as 2150mg phenanthrene / kg soil.

[0069] (2) Air-dry the appropriate amount of PAH-contaminated soil naturally for about a week. Subsequently, the soil was crushed and crushed. Sieve the pulverized soil with a 120-mesh soil sieve to obtain soil particles;

[0070] (3) Fe 3 o 4 Nanoparticles and g-C 3 N 4 Mix according to the mass ratio of 30:100, ultrasonically oscillate and mix for 2 hours in the mixed solution of ethanol and water (volume ratio 1:2), after solid-liquid separation, dry to obtain g-C 3 N 4 / Fe 3 o 4 composite material.

[0071] (4) the g-C obtained in step (3) 3 N 4 / Fe 3 o 4 The mass percentage of composite material and polluted soil is 6%, the g-C 3 N 4 / Fe 3 o 4 Mix the composi...

Embodiment 3

[0078] Under UV light source, g-C 3 N 4 / Fe 3 o 4 Composite materials used to remediate high-concentration phenanthrene-contaminated soil

[0079] (1) In the phenanthrene-contaminated soil sampled from the polluted land, the phenanthrene content was as high as 2150mg phenanthrene / kg soil.

[0080] (2) Air-dry the appropriate amount of PAH-contaminated soil naturally for about a week. Subsequently, the soil was crushed and crushed. Sieve the pulverized soil with a 120-mesh soil sieve to obtain soil particles;

[0081] (3) Fe 3 o 4 Nanoparticles and g-C 3 N 4 Mix according to the mass ratio of 30:100, ultrasonically oscillate and mix for 2 hours in the mixed solution of ethanol and water (volume ratio 1:2), after solid-liquid separation, dry to obtain g-C 3 N 4 / Fe 3 o 4 composite material.

[0082] (4) the g-C obtained in step (3) 3 N 4 / Fe 3 o 4 The mass percentage of composite material and polluted soil is 6%, the g-C 3 N 4 / Fe 3 o 4 Mix the composite ma...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to application of a g-C3N4 / Fe3O4 composite material to polycyclic aromatic hydrocarbon contaminated soil remediation. Through compounding of Fe3O4 nano particles and g-C3N4, the visible light absorption performance of the material is improved, compounding of photo-generated electrons and holes is effectivelyinhibited, and accordingly, the photocatalytic performance of the material is improved. A method for applying the g-C3N4 to polycyclic aromatic hydrocarbon contaminated soil remediation comprises thesteps of contaminated soil detection, contaminated soil breaking screening, and mixing of the g-C3N4 / Fe3O4 composite material and the contaminated soil. After the mixed soil is spread, polycyclic aromatic hydrocarbon in the soil can be removed through light, and the pH value of the soil does not need to be adjusted in the whole soil remediation process. According to the remediation method, the phytotoxicity of pollutants in the soil can be greatly reduced, and the difference between the growth coefficient of a plant growing on the remediated soil and the growth coefficient of a plant growingon the unpolluted soil is unobvious.

Description

technical field [0001] The present invention relates to g-C 3 N 4 / Fe 3 o 4 The invention relates to the use of a composite material in repairing polycyclic aromatic hydrocarbon polluted soil, belonging to the technical field of soil repair. 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. For a long time, due to the extensive economic development mode in our country, the unreasonable industrial structure and layout, the total amount of pollutant discharge has remained high, resulting in serious soil pollution in some areas, and related pollution incidents have occurred frequently. Polycyclic aromatic hydrocarbons (PAHs) refer to hydrocarbons composed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/04
CPCB09C1/08C09K17/04
Inventor 罗志军郑先荣王静宋由页吴智仁曲玲玲伍怡雯罗颖维
Owner JIANGSU UNIV
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