CN111687194A - g-C3N4/TiO2Method for repairing polycyclic aromatic hydrocarbon polluted soil by composite material - Google Patents
g-C3N4/TiO2Method for repairing polycyclic aromatic hydrocarbon polluted soil by composite material Download PDFInfo
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Abstract
The invention provides a g-C3N4/TiO2The method for repairing the polycyclic aromatic hydrocarbon contaminated soil by the composite material comprises the following steps of: removing foreign matters, grinding, crushing and sieving; testing the types and the content of the polycyclic aromatic hydrocarbons in the solution to determine the concentration of pollutants; g to C3N4/TiO2Mixing with polycyclic aromatic hydrocarbon polluted soil, stirring uniformly, and flattening to form a soil layer; placing the flattened soil layer under a light source for irradiation; after illumination, the soil layer is turned and stirred. The soil remediation method can effectively reduce 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 soil, so that the concentration of corresponding substances in the soil finally reaches a risk control standard value; the method is easy to implement, short in treatment period and remarkable in effect, and can effectively realize economic benefits, environmental benefits and social benefits.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a g-C3N4/TiO2A method for repairing polycyclic aromatic hydrocarbon polluted soil by using a composite material.
Background
Soil is an important resource for human survival and development, and once the soil is polluted, the pollutants in the soil can cause secondary pollution to surface water and underground water. Contaminants in the soil can enter the human body through drinking water or the soil-plant system via the food chain, directly endangering human health. Meanwhile, the degree of importance of the state on soil environmental pollution is greatly improved, related departments such as the department of ecological environment (the department of environmental protection of the original country) and the department of natural resources (the department of native resources of the original country) issue a series of laws and regulations and policies such as the national environmental protection law of the people's republic of China, the law of prevention and treatment of soil pollution, the law of environmental pollution of solid wastes, the law of ten items of soil and the like, and after the national soil pollution general survey stage work is initially completed, the phase of soil pollution treatment is started.
Polycyclic Aromatic Hydrocarbons (PAHs) refer to hydrocarbons in which two or more benzene rings are combined in a linear, angular, or cluster shape. Polycyclic aromatic hydrocarbons mainly come from incomplete combustion of organic pollutants such as petroleum, coal and the like and widely exist in air, soil and water environment. Polycyclic aromatic hydrocarbons have extremely high hydrophobicity and high stability, so that they are easily accumulated in soil. Polycyclic aromatic hydrocarbons are typically Persistent Organic Pollutants (POPs) with carcinogenic, teratogenic, mutagenic properties in soil. Polycyclic aromatic hydrocarbons have extremely strong hydrophobicity and high stability, so that the polycyclic aromatic hydrocarbons are easy to accumulate in soil, and the soil is a warehouse and a transfer station of the polycyclic aromatic hydrocarbons in natural environment. Once entering the soil, polycyclic aromatic hydrocarbons enter the human body through drinking water or a soil-plant system through a food chain, and are directly dangerous to the health of the human body. So far, a plurality of carcinogenic polycyclic aromatic hydrocarbons such as benzanthracene, benzopyrene and the like have been found, animal experiments show that the polycyclic aromatic hydrocarbons can induce skin cancer, liver cancer, stomach cancer, thyroid cancer, malignant lymphoma, oral cancer and the like, have strong teratogenic, carcinogenic and mutagenic effects, enter human bodies through skin, respiratory tract and digestive tract in the processes of forming, migrating, transforming and degrading, and finally seriously harm human health. Therefore, the polycyclic aromatic hydrocarbon polluted soil must be subjected to harmless treatment. Therefore, the polycyclic aromatic hydrocarbon-polluted soil poses great threat to human health, and needs to be repaired.
The remediation technology of the polycyclic aromatic hydrocarbon polluted soil mainly comprises a physical remediation technology, a chemical remediation technology and a biological remediation technology. The physical repair technology mainly comprises leaching, gas stripping, immobilization treatment and the like. The chemical repair technology mainly comprises an advanced oxidation method. The physical and chemical repair techniques are prone to secondary pollution and expensive in treatment cost. The bioremediation technology is beneficial to the absorption, transformation, degradation and fixation of polycyclic aromatic hydrocarbon by organisms, and achieves the effect of removing pollutants. Bioremediation techniques are susceptible to limitations of species of biological species, culture period and properties of polycyclic aromatic hydrocarbons, and bioremediation techniques are often long in repair period.
However, photocatalytic technology has found less application in the field of soil remediation. The photocatalytic technology is not regarded in the field of soil remediation mainly due to two reasons: (1) typical photocatalysts are e.g. TiO2ZnO and the like have catalytic capability only under ultraviolet light and can only be in sunlightThe utilization rate of the ultraviolet light is insufficient, wherein the ultraviolet light is less than 5 percent; (2) the photocatalyst is mainly composed of metal-based oxides, sulfides or salts, and the heavy metals once enter the soil, so that the risk of secondary pollution exists.
In view of this, it is an urgent need to solve the problem of the art to develop a photocatalyst having a good catalytic effect under visible light and causing little secondary pollution to soil and a method for repairing soil.
Disclosure of Invention
In view of the above, the present invention is directed to a g-C3N4/TiO2The method for repairing the polycyclic aromatic hydrocarbon polluted soil by the composite material has good catalytic effect under visible light and can not cause secondary pollution to the soil.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
g-C3N4/TiO2A method for remediating polycyclic aromatic hydrocarbon contaminated soil by using composite materials comprises
Step one, pretreating polycyclic aromatic hydrocarbon polluted soil: removing foreign matters in the soil polluted by the polycyclic aromatic hydrocarbon, and fully and uniformly mixing; mixing, naturally drying, rolling and crushing; crushing and sieving to obtain polycyclic aromatic hydrocarbon polluted soil particles;
testing the types and the content of the polycyclic aromatic hydrocarbons in the polycyclic aromatic hydrocarbon-polluted soil particles to determine the concentration of pollutants;
step three, mixing g-C3N4/TiO2Mixing with polycyclic aromatic hydrocarbon polluted soil, stirring uniformly, and flattening to form a soil layer;
step four, placing the flattened soil layer under a light source for irradiation;
and fifthly, turning and stirring the soil layer after illumination.
Further, the polycyclic aromatic hydrocarbon-polluted soil comprises at least one of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene.
Furthermore, the concentration of the polycyclic aromatic hydrocarbon in the polycyclic aromatic hydrocarbon polluted soil is not more than 100 mg/kg.
Further, the polycyclic aromatic hydrocarbon polluted soil is treated by a soil sieve with 50-100 meshes.
Further, g-C3N4/TiO2The preparation method comprises the following steps
Preparation of g-C3N4: placing melamine at 550 ℃ for roasting for 3 hours; and (3) mixing the roasted product in a volume ratio of 1:2, carrying out ultrasonic oscillation for 2 hours in the mixed solution of ethanol and water, carrying out solid-liquid separation, and drying to obtain g-C3N4；
Preparation of g-C3N4/TiO2: adding TiO into the mixture2And g-C3N4Ultrasonic oscillating and mixing in mixed solution of ethanol and water with the volume ratio of 1:2, separating solid from liquid, and drying to obtain g-C3N4/TiO2A composite material; the TiO is2And g-C3N4The mass ratio of (A) to (B) is 5-20: 100.
Further, in step three, the g-C3N4/TiO2The addition amount of the polycyclic aromatic hydrocarbon is 5-10% of the polycyclic aromatic hydrocarbon-polluted soil per kilogram.
Further, in the third step, the thickness of the soil layer is not more than 1.5 cm.
Furthermore, in the fourth step, the water content of the soil layer is between 20% and 50%.
Further, in the fourth step, the light source is sunlight.
Further, in the fifth step, the total illumination time is not less than 50 h.
Compared with the prior art, the invention has the following advantages:
1. the soil remediation method can effectively reduce 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, so that the concentration of the corresponding substances in the soil finally reaches a risk control standard value; the method is easy to operate and implement, short in treatment period and remarkable in effect, and can effectively realize economic benefits, environmental benefits and social benefits.
2. In the invention, g-C3N4/TiO2The composite material is applied to the whole process of degrading the polycyclic aromatic hydrocarbon in the soil, the pH value of the soil does not need to be adjusted, and therefore, other agents do not need to be added, the secondary pollution to the soil can be reduced, and the cost is saved.
3. Photocatalyst g-C of the present invention3N4/TiO2The composite material has excellent chemical stability, thermal stability and visible light absorption performance, so that the catalytic reaction can be completed under the irradiation of visible light in the remediation method, the composite material has good catalytic effect, the secondary pollution to soil can be reduced, and a new way is opened up for the application of the photocatalytic technology in the field of soil remediation; secondly, the catalyst can promote the diffusion mobility of organic matters, simultaneously increase the light penetration capacity and accelerate the degradation of PAHs; finally, the substances used for preparing the photocatalyst are all easily available substances, so that the cost is further reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 shows g-C as described in example 3.1 of the present invention3N4/TiO2The degradation rate of polycyclic aromatic hydrocarbon in the method for repairing polycyclic aromatic hydrocarbon polluted soil by the composite material is shown schematically.
Detailed Description
The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect through an intermediate medium, or the connection may be internal to the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
This example relates to a g-C3N4/TiO2A method for remediating polycyclic aromatic hydrocarbon contaminated soil by using composite materials comprises
Before repairing polycyclic aromatic hydrocarbon pollution, photocatalyst g-C is firstly prepared3N4/TiO2。g-C3N4/TiO2One preferred preparation method is as follows, specifically comprising the following steps
First is g-C3N4The preparation of (1): the melamine was placed in a covered crucible and calcined at 550 ℃ for 3 hours. Will bake overUltrasonically oscillating the calcined product in a mixed solution (volume ratio of 1: 2) of ethanol and water for 2 hours, separating solid from liquid, and drying to obtain g-C3N4。
Secondly g-C3N4/TiO2The preparation of (1): TiO 22And g-C3N4The proportion is determined according to the concentration of polycyclic aromatic hydrocarbon in soil, and when the concentration of polycyclic aromatic hydrocarbon does not exceed 50mg/kg, TiO is added2And g-C3N4The proportion is controlled between 5 percent and 10 percent; when the concentration of polycyclic aromatic hydrocarbon exceeds 50mg/kg, TiO2And g-C3N4The proportion is controlled between 10 percent and 20 percent, and the proportion is TiO2And g-C3N4Ultrasonic oscillating and mixing in mixed solution of ethanol and water, separating solid and liquid, and oven drying to obtain g-C3N4/TiO2A composite material.
Photocatalyst g-C3N4/TiO2After the preparation is finished, the method is applied to repairing polycyclic aromatic hydrocarbon polluted soil, and the repairing method specifically comprises the following steps:
step one, pretreating polycyclic aromatic hydrocarbon polluted soil: removing foreign matters in the soil polluted by the polycyclic aromatic hydrocarbon, and fully and uniformly mixing; mixing, naturally drying, rolling and crushing; and (4) sieving after crushing to obtain the polycyclic aromatic hydrocarbon polluted soil particles. Specifically, first, a proper amount of a soil sample is placed in an enamel tray, foreign matters such as branches, leaves, stones, glass, waste metals and the like are removed, and the sample is fully mixed. And secondly, naturally drying the soil, and rolling and crushing the soil. And finally, selecting a 50-100-mesh soil sieve to sieve the crushed soil to obtain soil particles with the required particle size. When the concentration of the polycyclic aromatic hydrocarbon is not more than 50mg/kg, a 50-mesh soil sieve is selected to treat the soil; when the concentration of the polycyclic aromatic hydrocarbon exceeds 50mg/kg, a 100-mesh soil sieve is selected for treating the soil.
And step two, testing the types and the contents of the polycyclic aromatic hydrocarbons in the polycyclic aromatic hydrocarbon-polluted soil particles by adopting a gas chromatography-mass spectrometry method, and determining the concentration of the pollutants. Preferably, the concentration of the polycyclic aromatic hydrocarbon in the polycyclic aromatic hydrocarbon polluted soil is not more than 100 mg/kg. More preferably, the polycyclic aromatic hydrocarbon-contaminated soil includes at least one of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene.
And step three, selecting a proper amount of photocatalyst according to the concentration of the pollutants measured in the step two. G to C3N4/TiO2Mixing with soil polluted by polycyclic aromatic hydrocarbon, stirring uniformly, and flattening to form a soil layer. Preferably, said g-C3N4/TiO2The addition amount of the polycyclic aromatic hydrocarbon is 5-10% of the polycyclic aromatic hydrocarbon-polluted soil per kilogram. More preferably, the thickness of the soil layer is not more than 1.5cm to satisfy sufficient light source irradiation.
And step four, placing the flattened soil layer under a light source for irradiation. Preferably, the moisture content of the soil layer is between 20% and 50% so as to meet the moisture requirement of the photocatalytic reaction. More preferably, the light source is sunlight.
And fifthly, turning and stirring the soil layer after illuminating for a certain time. Preferably, the total duration of the light irradiation is not less than 50h, so as to ensure that the photocatalytic reaction is fully performed. More preferably, the soil layer is placed under a light source for irradiation, and the soil is turned and stirred once every 12 hours to further enhance the catalytic reaction of the photocatalyst, so that the content of the polycyclic aromatic hydrocarbon in the soil is reduced.
Example 2
This example relates to a g-C3N4/TiO2The characterization of the method for repairing the polycyclic aromatic hydrocarbon polluted soil by the composite material.
Quartz sand is selected to replace an actual soil sample as a matrix, and the artificially polluted soil is repaired in a simulation mode. Firstly, sieving quartz sand by a 50-mesh soil sieve, dividing the quartz sand into 50g samples, adding a mixed standard solution of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene into the quartz sand to prepare 10mg/kg, 50mg/kg and 100mg/kg of soil polluted by polycyclic aromatic hydrocarbon, and naturally drying the soil in the shade for 24 h.
Example 2.1
(1) Preparation of photocatalyst g-C3N4/TiO2. First of all, g-C3N4: the melamine was placed in a covered crucible and calcined at 550 ℃ for 3 hours. Ultrasonically oscillating the roasted product in a mixed solution (volume ratio is 1: 2) of ethanol and water for 2 hours, separating solid from liquid, and drying to obtain g-C3N4. Second preparation of g-C3N4/TiO2: adding TiO into the mixture2And g-C3N4Ultrasonically oscillating and mixing the mixture in a mixed solution of ethanol and water (the volume ratio is 1: 2) according to the mass ratio of 5 percent, separating solid from liquid, and drying to obtain g-C3N4/TiO2A composite material.
(2) Photocatalyst g-C3N4/TiO2The method is applied to remediation of polycyclic aromatic hydrocarbon contaminated soil.
Step one, taking 10g of a prepared 10mg/kg polycyclic aromatic hydrocarbon polluted quartz sand sample, testing the type and content of polycyclic aromatic hydrocarbon, and determining the concentration of the pollutant, wherein the corresponding concentrations of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene are 9.43mg/kg, 9.12mg/kg, 10.8mg/kg, 8.93mg/kg and 9.89mg/kg respectively.
Step two, according to the concentration of the pollutants, selecting 0.1g of 5 percent concentration ratio g-C3N4/TiO2Photocatalysts, i.e. said TiO2And g-C3N4In a mass ratio of 1: 20. G to C3N4/TiO2Mixing with polycyclic aromatic hydrocarbon polluted soil, stirring uniformly, and spreading to form a 1.5cm soil layer.
And step three, placing the flattened soil layer under the sunlight for irradiation. Preferably, the soil layer has a moisture content of 20%.
And step four, turning and stirring the soil once every 12 hours. The total illumination time is 50 h.
Example 2.2
(1) Preparation of photocatalyst g-C3N4/TiO2. First of all, g-C3N4: the melamine was placed in a covered crucible and calcined at 550 ℃ for 3 hours. Ultrasonically oscillating the roasted product in a mixed solution (volume ratio is 1: 2) of ethanol and water for 2 hours, separating solid from liquid, and drying to obtain g-C3N4. Second preparation of g-C3N4/TiO2: adding TiO into the mixture2And g-C3N4Ultrasonically oscillating and mixing the mixture in a mixed solution of ethanol and water (the volume ratio is 1: 2) according to the mass ratio of 1:10, separating solid from liquid, and drying to obtain g-C3N4/TiO2A composite material.
(2) Photocatalyst g-C3N4/TiO2The method is applied to remediation of polycyclic aromatic hydrocarbon contaminated soil.
Step one, 10g of prepared 50mg/kg polycyclic aromatic hydrocarbon-polluted quartz sand sample is taken, the types and the contents of polycyclic aromatic hydrocarbons are tested, and the concentrations of pollutants are determined, wherein in the example, the corresponding concentrations of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene are 48.49mg/kg, 47.33mg/kg, 46.39mg/kg, 48.32mg/kg and 49.11mg/kg respectively.
Step two, according to the concentration of the pollutants, selecting 0.8g of 10 percent concentration ratio g-C3N4/TiO2Photocatalysts, i.e. said TiO2And g-C3N4The mass ratio of (A) to (B) is 1: 10. G to C3N4/TiO2Mixing with polycyclic aromatic hydrocarbon polluted soil, stirring uniformly, and flattening to form a 1cm soil layer.
And step three, placing the flattened soil layer under the sunlight for irradiation. Preferably, the moisture content of the soil layer is 35%.
And step four, turning and stirring the soil once every 12 hours. The total illumination time is 55 h.
Example 2.3
(1) Preparation of photocatalyst g-C3N4/TiO2. First of all, g-C3N4: the melamine was placed in a covered crucible and calcined at 550 ℃ for 3 hours. Ultrasonically oscillating the roasted product in a mixed solution (volume ratio is 1: 2) of ethanol and water for 2 hours, separating solid from liquid, and drying to obtain g-C3N4. Second preparation of g-C3N4/TiO2: adding TiO into the mixture2And g-C3N4Mixing ethanol and water (volume ratio 1: 2) according to the mass ratio of 3:10Ultrasonic oscillating and mixing in liquid, separating solid from liquid, and drying to obtain g-C3N4/TiO2A composite material.
(2) Photocatalyst g-C3N4/TiO2The method is applied to remediation of polycyclic aromatic hydrocarbon contaminated soil.
Step one, taking 10g of a prepared 100mg/kg polycyclic aromatic hydrocarbon polluted quartz sand sample, testing the type and content of polycyclic aromatic hydrocarbon, and determining the concentration of the pollutant, wherein the corresponding concentrations of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene are 99.01mg/kg, 95.48mg/kg, 94.11mg/kg, 89.43mg/kg and 90.24mg/kg respectively.
Step two, according to the concentration of the pollutants, selecting 0.05g of 20 percent concentration ratio g-C3N4/TiO2Photocatalysts, i.e. said TiO2And g-C3N4The mass ratio of (A) to (B) is 1: 5. G to C3N4/TiO2Mixing with polycyclic aromatic hydrocarbon polluted soil, stirring uniformly, and flattening to form a 1cm soil layer.
And step three, placing the flattened soil layer under the sunlight for irradiation. Preferably, the soil layer has a moisture content of 50%.
And step four, turning and stirring the soil once every 12 hours. The total illumination time is 60 h.
The result of the detection
Example 3
This example relates to a g-C3N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is a specific application under the embodiment 1.
Example 3.1
Pretreating polycyclic aromatic hydrocarbon contaminated soil: taking 50g of soil to be restored, putting the soil to be restored in an enamel tray, removing foreign matters such as branch rods, leaves, stones, glass, waste metals and the like, and fully and uniformly mixing the samples. And secondly, naturally drying the soil, and rolling and crushing the soil. And finally, selecting a 50-mesh soil sieve to sieve the crushed soil to obtain soil particles with the required particle size.
And (4) testing the types and the contents of the polycyclic aromatic hydrocarbons in the polycyclic aromatic hydrocarbon-polluted soil particles to determine the concentration of the pollutants. In this embodiment, the polycyclic aromatic hydrocarbon-contaminated soil includes benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene, and dibenzo (a, h) anthracene, and the corresponding concentrations thereof are 198.53ug/kg, 16.98ug/kg, 18.88ug/kg, 71.74ug/kg, and 181.89ug/kg, respectively.
Secondly, 5g of 5% concentration ratio g-C is taken3N4/TiO2Uniformly stirring the soil and the soil polluted by the polycyclic aromatic hydrocarbon, and flattening to form a soil layer with the thickness of 1.5 cm. Finally, the light repair was performed according to step three and step four in example 2.1. Polycyclic aromatic hydrocarbons in polycyclic aromatic hydrocarbon contaminated soil samples are detected before and after remediation respectively, and the detection results are shown in figure 1. As can be seen from fig. 1, the degradation rate of benzo (b) fluoranthene and dibenzo (a, h) is the highest, reaching 76% or more; benzo (a) anthracenes with a degradation rate of about 62%; the degradation rate of the remaining two substances is also close to 60%. Therefore, the remediation method disclosed by the invention can effectively reduce the 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, so that the concentration of the corresponding substances in the soil finally reaches the risk control standard value.
Example 3.2
The remediation method provided by the embodiment 3.2 of the invention is adopted to remediate the organic contaminated soil. Collecting a soil sample according to the related requirements of national standard HJ/T166, storing the soil sample in a clean ground brown glass bottle, and detecting the content of the polycyclic aromatic hydrocarbon in the soil by adopting a gas chromatography-mass spectrometry method. The procedure of example 2.2 was followed for light repair. And respectively detecting the polycyclic aromatic hydrocarbons in the soil samples before and after remediation. The results are shown in Table 2.
| Polycyclic aromatic hydrocarbon species | Before repair (ug/kg) | After repair (ug/kg) |
| Benzo (a) anthracenes | 198.53 | 63.53 |
| Benzo (a) pyrene | 16.98 | 6.62 |
| Benzo (b) fluoranthene | 18.88 | 5.29 |
| Indeno (1, 2, 3-cd) pyrene | 71.74 | 24.39 |
| Dibenzo (a, h) anthracenes | 181.89 | 34.56 |
Analysis of the data in table 2 shows that the remediation method for PAHs contaminated soil provided by the invention can effectively reduce the removal efficiency of 5 polycyclic aromatic hydrocarbons such as p-benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene in the contaminated soil, which is above 70% on average. The catalyst can promote the diffusion mobility of organic matters, increase the light penetration capacity and accelerate the degradation of PAHs.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and equivalents thereof.
Claims (10)
1. g-C3N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: the method comprises the following steps:
step one, pretreating polycyclic aromatic hydrocarbon polluted soil: removing foreign matters in the soil polluted by the polycyclic aromatic hydrocarbon, and fully and uniformly mixing; mixing, naturally drying, rolling and crushing; crushing and sieving to obtain polycyclic aromatic hydrocarbon polluted soil particles;
testing the types and the content of the polycyclic aromatic hydrocarbons in the polycyclic aromatic hydrocarbon-polluted soil particles to determine the concentration of pollutants;
step three, mixing g-C3N4/TiO2Mixing with polycyclic aromatic hydrocarbon polluted soil, stirring uniformly, and flattening to form a soil layer;
step four, placing the flattened soil layer under a light source for irradiation;
and fifthly, turning and stirring the soil layer after illumination.
2. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: the polycyclic aromatic hydrocarbon-polluted soil comprises at least one of benzo (a) anthracene, benzo (a) pyrene, benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene and dibenzo (a, h) anthracene.
3. g-C as claimed in claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: the concentration of the polycyclic aromatic hydrocarbon in the polycyclic aromatic hydrocarbon polluted soil is not more than 100 mg/kg.
4. g-C according to claim 13N4/TiO2Method for repairing polycyclic aromatic hydrocarbon polluted soil by composite materialThe method is characterized in that: in the first step, the polycyclic aromatic hydrocarbon polluted soil is treated by using a soil sieve with 50-100 meshes.
5. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: g-C3N4/TiO2The preparation method comprises the following steps
Preparation of g-C3N4: placing melamine at 550 ℃ for roasting for 3 hours; and (3) mixing the roasted product in a volume ratio of 1:2, carrying out ultrasonic oscillation for 2 hours in the mixed solution of ethanol and water, carrying out solid-liquid separation, and drying to obtain g-C3N4；
Preparation of g-C3N4/TiO2: adding TiO into the mixture2And g-C3N4Ultrasonic oscillating and mixing in mixed solution of ethanol and water with the volume ratio of 1:2, separating solid from liquid, and drying to obtain g-C3N4/TiO2A composite material; the TiO is2And g-C3N4The mass ratio of (A) to (B) is 5-20: 100.
6. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: in step three, the g-C3N4/TiO2The addition amount of the polycyclic aromatic hydrocarbon is 5-10% of the polycyclic aromatic hydrocarbon-polluted soil per kilogram.
7. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: in the third step, the thickness of the soil layer is not more than 1.5 cm.
8. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: in the fourth step, the water content of the soil layer is between 20 and 50 percent.
9. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: in the fourth step, the light source is sunlight.
10. g-C according to claim 13N4/TiO2The method for repairing polycyclic aromatic hydrocarbon contaminated soil by using the composite material is characterized by comprising the following steps: in the fifth step, the total illumination time is not less than 50 h.
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| CN113617831A (en) * | 2021-08-03 | 2021-11-09 | 东珠生态环保股份有限公司 | Remediation agent and remediation method for polycyclic aromatic hydrocarbon contaminated soil |
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Application publication date: 20200922 |