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Method of the degradation of polycyclic aromatic hydrocarbon compounds in soil combining TiO2 and ultraviolet light

A polycyclic aromatic hydrocarbon and ultraviolet light technology, which is applied in the field of photocatalytic degradation, can solve the problems of difficult control of conditions, incomplete treatment, long cycle, etc., and achieves the effects of low cost, accelerated photodegradation, and easy operation.

Inactive Publication Date: 2009-12-02
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many researches on the bioremediation of PAHs at home and abroad. Bioremediation has many advantages, but there are also some shortcomings, such as long cycle and difficult control of conditions, etc. Physical methods such as heating and rinsing are used to remove, which is expensive and incomplete.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The soil samples were air-dried indoors, ground, passed through a 1mm sieve, and sterilized twice by intermittent high-pressure steam (half an hour each time, at 121°C). After adding polycyclic aromatic hydrocarbons, they were air-dried for later use.

[0015] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: add a methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample in a weight-to-volume ratio of 1:1, every 1000ml of polycyclic aromatic hydrocarbons The methanol solution contained 10 mg of benzopyrene, pyrene or phenanthrene respectively, and placed in a fume hood for 24 hours, the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 10 mg / kg.

[0016] Preparation of PAH methanol solution: Accurately weigh 0.01 g of benzopyrene, pyrene, and phenanthrene, and dilute to 1000 ml with methanol.

[0017] Nano-TiO 2...

Embodiment 2

[0023] Soil samples were air-dried indoors, ground, passed through a 1mm sieve, and then intermittently sterilized by high-pressure steam twice (each time for half an hour, at 121°C). After adding polycyclic aromatic hydrocarbons, they were air-dried for later use.

[0024] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: add a methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample in a weight-to-volume ratio of 1:1, every 1000ml of polycyclic aromatic hydrocarbons The methanol solution contained 40mg of benzopyrene, pyrene or phenanthrene respectively, placed in a fume hood for 24 hours, and the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 40mg / kg.

[0025] Preparation of PAH methanol solution: Accurately weigh 0.04 g of benzopyrene, pyrene and phenanthrene, and dilute to 1000 ml with methanol.

[0026] Nano-Ti...

Embodiment 3

[0032] The soil samples were air-dried indoors, ground, passed through a 1mm sieve, and then intermittently sterilized by high-pressure steam twice (each time for half an hour, at 121°C). After adding polycyclic aromatic hydrocarbons, they were air-dried for later use.

[0033] Preparation of PAH-contaminated soil: Add 40 mg / 1000 ml of benzopyrene, pyrene and phenanthrene to the above-mentioned sterilized soil sample in a ratio of 1:1 (1 gram of soil: 1 ml of polycyclic aromatic hydrocarbons in methanol), and place In the fume hood for 24 hours, the concentration of polycyclic aromatic hydrocarbons in the contaminated soil was 40mg / kg.

[0034] Preparation of PAH methanol solution: Accurately weigh 0.04 g of benzopyrene, pyrene and phenanthrene, and dilute to 1000 ml with methanol.

[0035] Nano-TiO 2 It is anatase type, surface area: 50m 2 g -1 , Average diameter: 15nm.

[0036] TiO 2 It is mixed with polycyclic aromatic hydrocarbon-contaminated soil at a weight ratio of...

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Abstract

The present invention relates to the degradation of polycyclic aromatic hydrocarbons polluted soil, specifically a kind of ultraviolet nano-TiO2 catalytic degradation method of polycyclic aromatic hydrocarbons polluted soil, the mixture of polluted soil and nano-TiO2 is spread in the container, the addition amount of nano-TiO2 and The weight ratio of contaminated soil is 0.2%-5%, and it is placed in an ultraviolet light box for photodegradation. The light conditions in the light box: the wavelength of ultraviolet light is 210-365nm, the sample is 5-20cm away from the light source, and the light intensity is 500-10000μw / cm2, the temperature is 25-35°C, the humidity in the ventilation control box is 30-50%, and the light time is 2-14 days. The invention has the advantages of fast removal of pollutants, high efficiency, easy operation and no secondary pollution.

Description

technical field [0001] The invention relates to the photocatalytic degradation of polycyclic aromatic hydrocarbons polluted soil, specifically a kind of TiO 2 A method for degrading polycyclic aromatic hydrocarbons in soil combined with ultraviolet light. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants ubiquitous in the environment. There are two aspects to its source: natural source and man-made source. Natural sources are mainly forest and grassland fires, volcanic eruptions, synthesis of plants and microorganisms, among which synthesis of higher plants and microorganisms, and volcanic activity are the main factors that produce the background value of PAHs; artificial sources come from industrial production and processing (such as coke, carbon production of black and coal tar, refining and fractionation of crude oil and its derivatives, etc.), and incomplete combustion of organic matter. Among anthropogenic sources...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/06B09C1/08
Inventor 张利红李培军李雪梅巩宗强郑乐
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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