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Soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules

A remediation method and technology of polyphosphoric acid, applied in the field of environmental chemistry, can solve the problems of unsustainable pollutant treatment effect, gap in EDTA activity, inconvenient storage and transportation, etc. and cost-effective balance

Active Publication Date: 2013-08-14
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional Fenton reaction is through Fe 2+ Catalytic decomposition of H under acidic conditions 2 o 2 Hydroxyl radicals are generated to oxidize and degrade pollutants. In the repair process, a large amount of acid needs to be used, which has an acidifying effect on the soil; at the same time, a large amount of H needs to be added 2 o 2 , while H 2 o 2 Higher cost, inconvenient storage and transportation
Although there are recent patents and literature reports on ethylenediaminetetraacetic acid (EDTA) and other organic ligands, zero-valent iron and air Fenton-like reaction system to generate H in situ 2 o 2 , with the resulting Fe 2+ Fenton reaction occurs to degrade pollutants, but the EDTA used in this method is an organic ligand, which is prone to secondary pollution, and the activity of EDTA is significantly different from that of polyphosphoric acid. In addition, EDTA is also prone to self-degradation, and the effect of pollutant treatment is difficult. lasting

Method used

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  • Soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules
  • Soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules
  • Soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Treatment of Atrazine Contaminated Soil

[0036] In this example, the simulated polluted kaolin with self-prepared atrazine was used as the experimental object to carry out the ZVI / TPP / air soil treatment experiment. The concentration of atrazine was 50 mg / kg, and the mass ratio of ZVI (zero-valent iron) and organic matter-contaminated soil in the reaction system was 1:100. Take 6 g of contaminated soil, 0.056 g of zero-valent iron, 10 mL of TPP solution with a concentration of 100 mmol / L, and 30 mL of water in a reaction vessel, and stir the slurry evenly with a magnetic stirrer at 800 rpm, using an air pump Blast in air. figure 1 It was shown that the degradation rate of atrazine reached 50% after 50 min of reaction; when the reaction was extended to 60 min, the degradation rate of atrazine reached 99%.

Embodiment 2

[0038] Treatment of 2,4-Dichlorophenol (2,4-DCP) Contaminated Soil

[0039] The simulated contaminated kaolin with 2,4-DCP was configured to carry out the oxidative degradation experiment of the ZVI / TPP / air system. The concentration of 2,4-DCP in contaminated soil was 600 mg / kg. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:100. Add 6 g of simulated contaminated soil into the slurry reactor, stir the slurry with a magnetic stirrer at a speed of 800 rpm, and open the reactor in the air without aeration. figure 2 It was shown that after 1 h of reaction, the degradation rate of 2,4-DCP in soil was 80%; after 2 h of reaction, 2,4-DCP in the system was completely degraded.

Embodiment 3

[0041] Treatment of Alachlor Contaminated Soil

[0042] In this example, the oxidative degradation experiment of the ZVI / TPP / air system was carried out by using the simulated contaminated kaolin prepared by ourselves as the experimental object. The concentration of alachlor was 500 mg / kg. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:100. Take 6 g of contaminated soil, 0.056 g of zero-valent iron, 15 mL of TPP solution with a concentration of 100 mmol / L, and 30 mL of water in a reaction vessel, and stir the slurry evenly with a magnetic stirrer at 800 rpm, using an air pump Blast in air. image 3It was shown that the degradation rate of alachlor reached 60% after 40 min of reaction; when the reaction was extended to 70 min, the degradation rate of alachlor reached 99%.

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Abstract

The invention discloses a soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules. According to the method, by utilizing an environment-friendly low-cost oxidation reaction system formed by polyphosphoric acid, zero-valent iron and air, oxygen is activated by a Fe<2+> ligand generated by oxidizing polyphosphoric acid and the iron powder, so that the H2O2 is generated in situ and forms a Fenton reaction with Fe<2+>; and thus pollutants in the organic polluted soil are degraded. Compared with the traditional Fenton system or the similar Fenton system, polyphosphoric acid is very stable, difficult to degrade, environment-friendly and nontoxic to a human body, so that polyphosphoric acid does not generate secondary pollution as compared with other organic ligands, i.e., polyphosphoric acid is more durable in catalytic degradation effect. In addition, as the method is used, the erecting of a complicated device is not required; the restoration process is easy to operate; and the reaction can be performed by only mixing catalysts. Therefore, the dangerousness is avoided, i.e., the employing of a professional operator to perform the operation is not required.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, and in particular relates to a method for controlling and repairing organic pollutants in soil. Background technique [0002] Soil is an important natural resource and the material basis for human survival. With the acceleration of my country's industrialization process and the unrestrained use of agricultural chemicals, a large number of organic pollutants are discharged into the soil. These pollutants are often highly toxic, refractory, and persistent, causing serious damage to the ecosystem and human life and health. Great harm. [0003] At present, the remediation methods of organic polluted soil mainly include biological method, physical method and chemical method. The biodegradation treatment cycle is long and the efficiency is low. Physical methods can only transfer polluted soil, but cannot completely degrade pollutants. The chemical method has the advantage of being fast and eff...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 张礼知廖玉海
Owner HUAZHONG NORMAL UNIV
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