CN101176879A - Photocatalysis method for removing PAHs in soil - Google Patents
Photocatalysis method for removing PAHs in soil Download PDFInfo
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- CN101176879A CN101176879A CNA2006101342073A CN200610134207A CN101176879A CN 101176879 A CN101176879 A CN 101176879A CN A2006101342073 A CNA2006101342073 A CN A2006101342073A CN 200610134207 A CN200610134207 A CN 200610134207A CN 101176879 A CN101176879 A CN 101176879A
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Abstract
The invention relates to polycyclic aromatic hydrocarbon polluted soil degradation, in particular to a photocatalysis method for removing polycyclic aromatic hydrocarbon from soil. The invention is characterized in that a mixture of polluted soil and Fe2O3 is flatted in a container, and then is put in a ultraviolet light source chamber to carry out photodegradation; the weight ratio of the amount of Fe2O3 in the polluted soil is 1% to 10%; a plurality of illumination conditions in the ultraviolet light source chamber are a wavelength of ultraviolet light of 210 to 365 nm, a distance between the sample and the light source of 5 to 20 cm, an illumination intensity of 500 to 10000 Mu w/cm<2>, a temperature of 25 to 35 DEG C, a humidity of 30 to 50% in a ventilation control box and illumination time of 2 to 14 days. The invention has the advantages of rapid speed of pollutant removal, high efficiency, easy operation and no secondary pollution.
Description
Technical field
The present invention relates to the degraded of polycyclic aromatic hydrocarbon pollution, specifically a kind of photocatalysis method of removing PAHs in the soil.
Background technology
Polycyclic aromatic hydrocarbon compounds (PAHs) is a ubiquitous class organic pollution in the environment.There are two aspects in its source: natural source and artificial source.Natural source mainly is the synthetic of forest and grassland big fire, volcanic eruption, plant and microorganism, and wherein synthetic, the colcanism of higher plant and microorganism are the main factors that produces the PAHs background value; Artificial source is from industrial production and processing (as the refining of production, crude oil and the derivative thereof of coke, carbon black and coal tar and fractionation etc.), and process such as organic imperfect combustion.In artificial source, artificial fuel combustion is the main contribution factor of industrially developed country and urban area PAHs, and the PAHs of exposure has brought huge health hazard for the people that live in developed regions, the world.Why PAHs as environmental contaminants is subjected to people's attention, at first is because secondly carcinogenic, the teratogenesis of some PAHs and mutagenesis are because PAHs stablizes, is difficult to degraded, is ever-increasing trend in environment.Adopt the rational recovery technique of economic benefit and environmental benefit to administer PAHs and pollute, be subject to people's attention more and more.
At present, comprise biological restoration, physics reparation and chemistry reparation about the PAHs pollution remediation technology.The biological restoration of PAHs has a lot of researchs at home and abroad, and biological restoration has many good qualities, and also comes with some shortcomings simultaneously, and is long as the cycle, and condition is difficult to be controlled etc.; Adopt physical methods such as heating and drip washing to remove, the expense height is handled not thorough.In recent years, UV-irradiation and semiconductor Fe
2O
3Symphyogenetic photocatalytic process has been proved a new technology effective and the degradation treatment pollutant that is highly profitable by many achievements in research.
Summary of the invention
The object of the present invention is to provide that a kind of speed is fast, efficient is high, easy operating, do not produce the photocatalysis method of PAHs in the removal soil of secondary pollution.
For achieving the above object, the technical solution used in the present invention is: with contaminated soil and Fe
2O
3Mixture in vessel, pave, place the ultraviolet lighting case to carry out illumination degrading, Fe
2O
3Addition and the weight ratio of contaminated soil be 1%-10%, the illumination condition in the lighting box: the ultraviolet lighting wavelength is 210-365nm, sample is apart from light source 5-20cm, intensity of illumination is 500-10000 μ w/cm
2, temperature is 20-38 ℃, humidity is 30-50% in the Ventilation Control case, light application time 2-14 days.
Described Fe
2O
3Addition and the weight ratio of contaminated soil be 2%-8%, described ultraviolet lighting wavelength is 254-295nm, sample is apart from light source 5-15cm, intensity of illumination is 1000-3000 μ w/cm
2, temperature is 28-32 ℃, humidity is 35-40% in the Ventilation Control case, light application time 8-12 days.
The ultraviolet lighting dominant wavelength that described ultraviolet lighting case is selected for use is 254nm, 310nm or 365nm.Described polycyclic aromatic hydrocarbon is BaP, pyrene or phenanthrene.Polycyclic aromatic hydrocarbon is 10-200mg/kg in the described contaminated soil.
The present invention has following advantage:
1. the speed of removal pollutant is fast, efficient is high.Polycyclic aromatic hydrocarbon is that a class persistent organism matter is generally hundreds of days to many decades in the time of nature permineralization, and the time that plant is repaired fully is more than 200 days.The present invention can be used for polycyclic aromatic hydrocarbons contaminated soil such as BaP, pyrene and phenanthrene.Do not adding Fe
2O
3Situation under, the light degradation of polycyclic aromatic hydrocarbon needs 35-50 days.BaP, pyrene and luxuriant and rich with fragrance content are 40mg/kg in soil, and after handling through illumination in 8 days, BaP is at four kinds of different Fe
2O
3The degradation rate that adds concentration conditions (2%, 5%, 7% and 10%) is respectively 93.06%, 96.28%, 98.31% and 94.02%; After illumination in 12 days processing, pyrene is at four kinds of different Fe
2O
3The degradation rate that adds concentration conditions (2%, 5%, 7% and 10%) is respectively 94.29%, 91.03%, 90.48% and 84.72%; After illumination in 10 days processing, luxuriant and rich with fragrance at four kinds of different Fe
2O
3The degradation rate that adds concentration conditions (2%, 5%, 7% and 10%) is respectively 96.06%, 97.92%, 98.74% and 95.84%.Add small amount of Fe
2O
3Accelerated the light degradation of polycyclic aromatic hydrocarbon greatly.
2. easy operating.The present invention makes the processing of contaminated soil simple, with low cost.Only need contaminated soil is carried out air-dry, the simple process of screening is with a spot of Fe
2O
3Carry out mechanical mixture with contaminated soil, the device that then mixed soil is laid on the plane is placed on to shine under the ultraviolet source and gets final product.
3. do not produce secondary pollution.The invention belongs to photochemical degradating, a small amount of semiconductor that it adds in contaminated soil is the material that itself has in the soil, toxic action can be do not produced to soil, thereby secondary pollution can not be caused, and be a kind of method of environmentally friendly processing contaminated soil.
The specific embodiment
The present invention is further described below in conjunction with embodiment.
Embodiment 1
Soil sample grinds at room-dry, crosses the 1mm sieve, and batch (-type) high pressure steam sterilization 2 times (each half an hour, 121 ℃) is behind the adding polycyclic aromatic hydrocarbon, air-dry standby.
The preparation of polycyclic aromatic hydrocarbon pollution: with in the soil sample of above-mentioned sterilization by weight 1: 1 ratio of volume ratio add methanol solution (the 1 gram soil: the methanol solution of 1ml polycyclic aromatic hydrocarbon) of polycyclic aromatic hydrocarbon, the BaP, pyrene or the phenanthrene that contain 10mg in the methanol solution of every 1000ml polycyclic aromatic hydrocarbon respectively, place ventilating kitchen 24h, the concentration of polycyclic aromatic hydrocarbon is 10mg/kg in the contaminated soil.
The preparation of polycyclic aromatic hydrocarbon methanol solution: accurately take by weighing 0.01 the gram BaP, pyrene and phenanthrene, respectively with methanol constant volume to 1000ml.
With Fe
2O
3Mix by weight 2% with polycyclic aromatic hydrocarbon pollution, mechanical agitation is to evenly.
Take by weighing the above-mentioned soil sample of 5g and place the petri diss of 9cm diameter, pave, place lighting box to degrade.Irradiation is 8-12 days in lighting box, and soil is put into the 100ml centrifuge tube, adds the carrene of 25ml, ultrasonic water bath 2 hours, and the centrifugal 5min of 5000rmp crosses post, measures the content of the polycyclic aromatic hydrocarbon in the mixed liquor.
Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 254nm, and sample is apart from light source 15cm, and intensity of illumination is 1071 μ w/cm
2, temperature is 30 ± 1 ℃, humidity is 35% ± 2%.
Treatment effect: the degradation rate through BaP after 8 days the irradiation reaches 87.20%, reaches 70.32% through the degradation rate of pyrene after 12 days the irradiation, reaches 85.86% through degradation rate luxuriant and rich with fragrance after 10 days the irradiation.
Embodiment 2
Soil sample grinds at room-dry, crosses the 1mm sieve, and batch (-type) high pressure steam sterilization 2 times (each half an hour, 121 ℃) is behind the adding polycyclic aromatic hydrocarbon, air-dry standby then.
The preparation of polycyclic aromatic hydrocarbon pollution: with in the soil sample of above-mentioned sterilization by weight 1: 1 ratio of volume ratio add methanol solution (the 1 gram soil: the methanol solution of 1ml polycyclic aromatic hydrocarbon) of polycyclic aromatic hydrocarbon, the BaP, pyrene or the phenanthrene that contain 40mg in the methanol solution of every 1000ml polycyclic aromatic hydrocarbon respectively, place ventilating kitchen 24h, the concentration of polycyclic aromatic hydrocarbon is 40mg/kg in the contaminated soil.
The preparation of polycyclic aromatic hydrocarbon methanol solution: accurately take by weighing 0.04 the gram BaP, pyrene and phenanthrene, respectively with methanol constant volume to 1000ml.
With Fe
2O
3Mix by weight 5% with polycyclic aromatic hydrocarbon pollution, mechanical agitation is to evenly.
Take by weighing the above-mentioned soil sample of 5g and place the petri diss of 9cm diameter, pave, place lighting box to degrade.Irradiation is 8-12 days in lighting box, and soil is put into the 100ml centrifuge tube, adds the carrene of 25ml, ultrasonic water bath 2 hours, and the centrifugal 5min of 5000rmp crosses post, measures the content of the polycyclic aromatic hydrocarbon in the mixed liquor.
Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 254nm, and sample is apart from light source 5cm, and intensity of illumination is 680 μ w/cm
2, temperature is 30 ± 1 ℃, humidity is 45% ± 2%.
Treatment effect: the degradation rate through BaP after 8 days the irradiation reaches 92.59%, reaches 78.81% through the degradation rate of pyrene after 12 days the irradiation, reaches 86.56% through degradation rate luxuriant and rich with fragrance after 10 days the irradiation
Embodiment 3
Soil sample grinds at room-dry, crosses the 1mm sieve, and batch (-type) high pressure steam sterilization 2 times (each half an hour, 121 ℃) is behind the adding polycyclic aromatic hydrocarbon, air-dry standby then.
The preparation of polycyclic aromatic hydrocarbon pollution: with in the soil sample of above-mentioned sterilization by weight 1: 1 ratio of volume ratio add methanol solution (the 1 gram soil: the methanol solution of 1ml polycyclic aromatic hydrocarbon) of polycyclic aromatic hydrocarbon, the BaP, pyrene or the phenanthrene that contain 40mg in the methanol solution of every 1000ml polycyclic aromatic hydrocarbon respectively, place ventilating kitchen 24h, the concentration of polycyclic aromatic hydrocarbon is 40mg/kg in the contaminated soil.
The preparation of polycyclic aromatic hydrocarbon methanol solution: accurately take by weighing 0.04 the gram BaP, pyrene and phenanthrene, respectively with methanol constant volume to 1000ml.
With Fe
2O
3Mix by weight 7% with polycyclic aromatic hydrocarbon pollution, mechanical agitation is to evenly.
Take by weighing the above-mentioned soil sample of 5g and place the petri diss of 9cm diameter, pave, place lighting box to degrade.Irradiation is 8-12 days in lighting box, and soil is put into the 100ml centrifuge tube, adds the carrene of 25ml, ultrasonic water bath 2 hours, and the centrifugal 5min of 5000rmp crosses post, measures the content of the polycyclic aromatic hydrocarbon in the mixed liquor.
Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 365nm, and sample is apart from light source 20cm, and intensity of illumination is 9480 μ w/cm
2, temperature is 20 ± 1 ℃, humidity is 30% ± 2%.
Treatment effect: the degradation rate through BaP after 8 days the irradiation reaches 93.60%, reaches 82.87% through the degradation rate of pyrene after 12 days the irradiation, reaches 95.01% through degradation rate luxuriant and rich with fragrance after 10 days the irradiation.
Embodiment 4
Soil sample grinds at room-dry, crosses the 1mm sieve, and batch (-type) high pressure steam sterilization 2 times (each half an hour, 121 ℃) is behind the adding polycyclic aromatic hydrocarbon, air-dry standby then.
The preparation of polycyclic aromatic hydrocarbon pollution: with in the soil sample of above-mentioned sterilization by weight 1: 1 ratio of volume ratio add methanol solution (the 1 gram soil: the methanol solution of 1ml polycyclic aromatic hydrocarbon) of polycyclic aromatic hydrocarbon, the BaP, pyrene or the phenanthrene that contain 200mg in the methanol solution of every 1000ml polycyclic aromatic hydrocarbon respectively, place ventilating kitchen 24h, the concentration of polycyclic aromatic hydrocarbon is 200mg/kg in the contaminated soil.
The preparation of polycyclic aromatic hydrocarbon methanol solution: accurately take by weighing 0.2 the gram BaP, pyrene and phenanthrene, respectively with methanol constant volume to 1000ml.
With Fe
2O
3Mix by weight 10% with polycyclic aromatic hydrocarbon pollution, mechanical agitation is to evenly.
Take by weighing the above-mentioned soil sample of 5g and place the petri diss of 9cm diameter, pave, place lighting box to degrade.Irradiation is 8-12 days in lighting box, and soil is put into the 100ml centrifuge tube, adds the carrene of 25ml, ultrasonic water bath 2 hours, and the centrifugal 5min of 5000rmp crosses post, measures the content of the polycyclic aromatic hydrocarbon in the mixed liquor.
Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 310nm, and sample is apart from light source 15cm, and intensity of illumination is 3000 μ w/cm
2, temperature is 35 ± 1 ℃, humidity is 45% ± 2%.
Treatment effect: the degradation rate through BaP after the irradiation of 2 days and 8 days reaches 25.34% and 92.78%, degradation rate through pyrene after the irradiation of 2 days and 12 days reaches 14.47% and 73.58%, reaches 21.93% and 94.68% through luxuriant and rich with fragrance degradation rate after the irradiation of 2 days and 10 days.
Claims (5)
1. a photocatalysis method of removing PAHs in the soil is characterized in that: with contaminated soil and Fe
2O
3Mixture in vessel, pave, place the ultraviolet lighting case to carry out illumination degrading, Fe
2O
3The weight ratio of addition and contaminated soil is 1%-10%, the illumination condition in the lighting box: the ultraviolet lighting wavelength is 210-365nm, and sample is apart from light source 5-20cm, and intensity of illumination is 500-10000 μ w/cm
2, temperature is 20-38 ℃, humidity is 30-50% in the Ventilation Control case, light application time 2-14 days.
2. according to the photocatalysis method of PAHs in the described removal soil of claim 1, it is characterized in that: Fe
2O
3Addition and the weight ratio of contaminated soil be 2%-8%, described ultraviolet lighting wavelength is 254-295nm, sample is apart from light source 5-15cm, intensity of illumination is 1000-3000 μ w/cm
2, temperature is 28-32 ℃, humidity is 35-40% in the Ventilation Control case, light application time 8-12 days.
3. according to the photocatalysis method of PAHs in the described removal soil of claim 1, it is characterized in that: the ultraviolet lighting dominant wavelength that described ultraviolet lighting case is selected for use is 254nm, 310nm or 365nm.
4. according to the photocatalysis method of PAHs in the described removal soil of claim 1, it is characterized in that: described polycyclic aromatic hydrocarbon is BaP, pyrene or phenanthrene.
5. according to the photocatalysis method of PAHs in the described removal soil of claim 1, it is characterized in that: polycyclic aromatic hydrocarbon is 10-200mg/kg in the described contaminated soil.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101342073A CN101176879A (en) | 2006-11-08 | 2006-11-08 | Photocatalysis method for removing PAHs in soil |
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|---|---|---|---|
| CNA2006101342073A CN101176879A (en) | 2006-11-08 | 2006-11-08 | Photocatalysis method for removing PAHs in soil |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103436268A (en) * | 2013-08-21 | 2013-12-11 | 太仓碧奇新材料研发有限公司 | Preparation method for phenol-contaminated soil remediation material |
| CN103831290A (en) * | 2012-11-28 | 2014-06-04 | 北京师范大学 | Method for remediating polycyclic aromatic hydrocarbon polluted soil by photocatalysis electrospinning fiber membrane |
| CN105013799A (en) * | 2015-07-08 | 2015-11-04 | 上海大学 | Method for degrading benzopyrene/lead pollution in road dust through irradiation |
| CN108515079A (en) * | 2018-04-13 | 2018-09-11 | 江苏大学 | g-C3N4Purposes in repairing polycyclic aromatic hydrocarbon pollution |
| CN108655168A (en) * | 2018-04-13 | 2018-10-16 | 江苏大学 | g-C3N4/Fe3O4Purposes of the composite material in repairing polycyclic aromatic hydrocarbon pollution |
| CN109100318A (en) * | 2018-08-10 | 2018-12-28 | 辽宁大学 | Evaluation method of the dissolved organic matter to pyrene photodissociation quenching effect in a kind of ice phase |
| CN109759427A (en) * | 2019-01-25 | 2019-05-17 | 湖南新九方科技有限公司 | The restorative procedure of PAHs contaminated soil |
| CN113604223A (en) * | 2021-08-03 | 2021-11-05 | 南京工业大学 | Novel thermal desorption catalyst for inducing organic matter contaminated soil and preparation method thereof |
-
2006
- 2006-11-08 CN CNA2006101342073A patent/CN101176879A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103831290A (en) * | 2012-11-28 | 2014-06-04 | 北京师范大学 | Method for remediating polycyclic aromatic hydrocarbon polluted soil by photocatalysis electrospinning fiber membrane |
| CN103831290B (en) * | 2012-11-28 | 2016-03-09 | 北京师范大学 | A kind of method of repairing polycyclic aromatic hydrocarbon pollution with photocatalysis electrospun fiber membrane |
| CN103436268A (en) * | 2013-08-21 | 2013-12-11 | 太仓碧奇新材料研发有限公司 | Preparation method for phenol-contaminated soil remediation material |
| CN105013799A (en) * | 2015-07-08 | 2015-11-04 | 上海大学 | Method for degrading benzopyrene/lead pollution in road dust through irradiation |
| CN108515079A (en) * | 2018-04-13 | 2018-09-11 | 江苏大学 | g-C3N4Purposes in repairing polycyclic aromatic hydrocarbon pollution |
| CN108655168A (en) * | 2018-04-13 | 2018-10-16 | 江苏大学 | g-C3N4/Fe3O4Purposes of the composite material in repairing polycyclic aromatic hydrocarbon pollution |
| CN109100318A (en) * | 2018-08-10 | 2018-12-28 | 辽宁大学 | Evaluation method of the dissolved organic matter to pyrene photodissociation quenching effect in a kind of ice phase |
| CN109759427A (en) * | 2019-01-25 | 2019-05-17 | 湖南新九方科技有限公司 | The restorative procedure of PAHs contaminated soil |
| CN113604223A (en) * | 2021-08-03 | 2021-11-05 | 南京工业大学 | Novel thermal desorption catalyst for inducing organic matter contaminated soil and preparation method thereof |
| CN113604223B (en) * | 2021-08-03 | 2022-07-22 | 南京工业大学 | Catalyst for inducing thermal desorption of organic-polluted soil and preparation method thereof |
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Open date: 20080514 |