Application of sulfonated graphene oxide in remediation of soil contaminated by polycyclic aromatic hydrocarbons
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A technology of sulfonated graphene and polycyclic aromatic hydrocarbons, applied in the field of soil pollution control
Inactive Publication Date: 2016-05-04
SUZHOU GRAPHENE NEW MATERIAL TECH +1
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There is no report on the remediation of PAH
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Embodiment 1
[0017] The test soil was collected from a coking plant in Beijing, air-dried and ground through a 60m sieve for later use. Basic physical and chemical properties of the soil: pH is 6.2; soil organic matter is 22.3g / kg; soil clay, sand, and silt account for 36.9wt.%, 9.8wt.%, and 53.3wt.%. The total content of 16 kinds of EPA priority control PAHs is 31.99mg / kg, PAHs pollution is serious and the harm is high.
[0018] Weigh 2g of the test soil into a 100mL glass centrifuge tube, add an appropriate amount of eluent (10-40mL) according to a certain soil-to-liquid ratio, tighten the tube plug, and after ultrasonic enhancement for 30min, place it on a shaker (150rpm) for oscillating rinse 24h. After shaking, centrifuge with centrifuge (centrifugal force 716g) for 5min, discard the supernatant, freeze-dry and weigh 1g of the treated soil to extract and measure.
[0019] figure 1 a, 1b, and 1c represent the removal rates of PAHs in the same contaminated soil treated with different...
Embodiment 2
[0027] Comparison of different types of eluents with SGO
[0028] Under the same eluting conditions (eluent concentration 4000mg L -1 , the ratio of soil to liquid is 1:10) after washing once, the comparison of the removal rate of PAHs in soil by Tween 80 (TW80) and methyl-β-cyclodextrin (MCD) and SGO is as follows figure 2 shown. After elution once, the removal rates of PAHs were 19.9%, 25.0% and 38.5%, respectively. At the same concentration, SGO had the best elution effect, and the removal rate of PAHs was more than 150% times that of MCD.
[0029] From the results of the above example, it can be seen that when the SGO concentration is 4000ppm, the elution effect of PAHs in the soil is better, and the removal rate of soil-liquid ratio 1:10 and 1:20 after leaching 4 times all reaches more than 80%, wherein 1: 10 can be used as the optimal rinsing process parameter. Under the same conditions, SGO eluted PAHs-contaminated soil, and the removal rates were 150% and 200% of t...
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Abstract
The invention relates to application of a sulfonated graphene oxide in remediation of soil contaminated by polycyclic aromatic hydrocarbons. A sulfonated graphene oxide eluting solution is added to soil according to a soil-solution ratio of 2g: (10-40)mL, and the mixture is put into a centrifugal tube; ultrasonic enhancement is carried out for 30 minutes, and then the centrifugal tube is placed on a shaker for shaking eluting at a room temperature and a speed of150rpm for 24h; and after shaking is completed, the supernatant liquor is abandoned after centrifuging, and then remediation is finished. According to the application of the sulfonated graphene oxide in the remediation of the soil contaminated by the polycyclic aromatic hydrocarbons, the PAHs in the contaminated soil can be effectively removed by using the sulfonated graphene oxide, and the removal rate of the PAHs is above 84%. Under the same eluting conditions (e.g., the eluting solution concentration, the soil-solution ratio, eluting times and the like), the removal rate of the PAHs by eluting the contaminated solution with the SGO is more than 150% and 200% of an eluting removal ratio achieved by using methyl-beta-cyclodextrin (methyl-beta-MCD) and an eluting removal ratio achieved by using polysorbate (TW80), respectively.
Description
technical field [0001] The invention belongs to the field of soil pollution control in environmental protection, and discloses an application of sulfonated graphene in repairing soil polluted by polycyclic aromatic hydrocarbons. Background technique [0002] Polycyclic aromatic hydrocarbons are a common class of persistent organic pollutants in the soil environment. Because of their good thermal stability and strong hydrophobicity, they can be adsorbed in soil particles for a long time and are difficult to degrade. In recent years, with the acceleration of urbanization in my country, many coking plants in urban areas have stopped production and relocated, and the problems of soil pollution and site reuse left after relocation have become increasingly prominent. Remediation of PAH-contaminated soil has become an urgent need for coking sites. solved puzzles. Among the soil remediation technologies of contaminated sites, the soil ectopic leaching technology has the characterist...
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