Method for degrading polycyclic aromatic hydrocarbons by using zero-valent iron activated persulfate

A technology for activating persulfate and polycyclic aromatic hydrocarbons, applied in the application field of soil pollution control, can solve the problems of unfavorable pollutant reaction and degradation effect reduction, and achieve the effect of difficult removal, simple operation and wide pH application range

Inactive Publication Date: 2019-12-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the existing Fe 2+ Activated persulfate system to generate SO 4 · - The speed is too fast, which is not conducive to its reaction with pollutants and Fe 2+ with SO 4 · - The quenching reaction between the resulting SO 4 · - reduce the problem of reducing the degradation effect

Method used

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  • Method for degrading polycyclic aromatic hydrocarbons by using zero-valent iron activated persulfate
  • Method for degrading polycyclic aromatic hydrocarbons by using zero-valent iron activated persulfate
  • Method for degrading polycyclic aromatic hydrocarbons by using zero-valent iron activated persulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 10 mg of phenanthrene in 100 ml of acetone solution to prepare a phenanthrene mother solution with a concentration of 100 mg / L. Take 10ml of phenanthrene mother liquor in the reaction bottle, then add 10ml of ultrapure water, then add 6mg of nanometer zero-valent iron to the reaction system, and finally add 0.238g of sodium persulfate, and place the reaction bottle on a mixer for reaction . The molar ratio of nanometer zero-valent iron to sodium persulfate in the system is 0.1:1, and the reaction temperature is room temperature.

[0028] Sampling was carried out after 0min, 5min, 10min, 30min, and 60min of the reaction respectively. There were 8 sampling points in total. The percentage of the ratio of the concentration of phenanthrene in the sample at each time to the initial concentration.

Embodiment 2

[0030] Compared with Example 1, the only difference is that the molar ratio of zero-valent iron to sodium persulfate dosage is 1:1.

Embodiment 3

[0032] Compared with Example 1, the only difference is that the molar ratio of zero-valent iron to sodium persulfate dosage is 0.5:1.

[0033] In embodiment 1~3, the remaining rate-time relationship figure of the obtained phenanthrene is as follows figure 2 As shown, the ordinate in the figure is the remaining rate of phenanthrene, and the abscissa is the reaction time. The degradation effect is reflected by the phenanthrene residual rate. The smaller the phenanthrene residual rate, the better the degradation effect. The phenanthrene residual rate is the percentage of the ratio of the concentration of phenanthrene in the sample to the initial concentration of phenanthrene at each moment. figure 2 It reflects the effect of different proportions of zero-valent iron and persulfate on the degradation effect.

[0034] Embodiments 1 to 3 utilize different ratios of zero-valent iron and persulfate to degrade phenanthrene, by figure 2 It can be seen that when the molar ratio of z...

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Abstract

The invention provides a method for removing polycyclic aromatic hydrocarbons by using zero-valent iron activated persulfate. The method comprises the following steps: adding zero-valent iron and persulfate into a system rich in polycyclic aromatic hydrocarbons; and after carrying out full mixing and reacting, removing the polycyclic aromatic hydrocarbons in the system. According to the method, the zero-valent iron is used for dissolving out ferrous ions in a reaction system, the persulfate is activated to generate sulfate radicals, the polycyclic aromatic hydrocarbons are degraded, and a purpose of removing the polycyclic aromatic hydrocarbons in soil and underground water is achieved. The method has the advantages that the polycyclic aromatic hydrocarbons can be effectively degraded under the condition of small feeding amount, meanwhile, quenching reaction between the ferrous ions and the sulfate radicals can be avoided, and the degradation efficiency is improved. A good removal effect can be achieved at normal temperature, the pH application range is wide, the method is simple to operate, and the method can be implemented without other equipment and can be used for removing thepolycyclic aromatic hydrocarbons in the soil and the underground water.

Description

technical field [0001] The invention belongs to the application field of soil pollution control, and in particular relates to a method for degrading polycyclic aromatic hydrocarbons in soil by activating persulfate with zero-valent iron. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants ubiquitous in the environment, mainly from industrial activities such as coal and oil combustion, and widely exist in natural media such as soil, sediment, water, and air. PAHs have low bioavailability and are difficult to degrade. They are one of the priority environmental pollutants listed in my country. PAHs are carcinogenic, teratogenic, and mutagenic. Studies have shown that excessive exposure to polycyclic aromatic hydrocarbons will increase the probability of cancer and seriously endanger human health. At present, the main remediation methods for PAH pollution at home and abroad include microbial degradation, phytoremediation, phy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/32
CPCC02F1/72C02F2101/327C02F2305/02
Inventor 占敬敬安宇杨高玄彭爱夏
Owner DALIAN UNIV OF TECH
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