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Iron-based biochar catalyst and oxidative repairing method for polluted soil

A technology for oxidative remediation and polluted soil, which is applied in the restoration of polluted soil, catalysts for physical/chemical processes, chemical instruments and methods, etc. It can solve the problems of secondary pollution and large influence of soil moisture, and achieves poor effectiveness and high efficiency. Effects of Oxidation of Polycyclic Aromatic Hydrocarbons in High Efficiency Industrial Sites

Inactive Publication Date: 2019-11-05
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Persulfate systems are usually formed by activation ● OH and SO 4 ●- Such free radical oxidants can efficiently oxidize soil polycyclic aromatic hydrocarbons, but sulfate will be generated during the oxidation process of the persulfate system, and there are a large number of corrosive pipelines in the repair site, which will also cause secondary pollution
o 3 and TiO 2 The photocatalytic oxidation system can also generate oxidative free radicals to degrade organic pollutants, but O 3 Usually injected in the form of gas, it is only suitable for soil with large pores and good permeability, and is greatly affected by soil moisture, while TiO 2 The system needs to be carried out under ultraviolet light irradiation, and the oxidation reaction usually only occurs in the surface soil

Method used

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  • Iron-based biochar catalyst and oxidative repairing method for polluted soil
  • Iron-based biochar catalyst and oxidative repairing method for polluted soil
  • Iron-based biochar catalyst and oxidative repairing method for polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for oxidative remediation of polycyclic aromatic hydrocarbon-contaminated soil in industrial sites is as follows:

[0034] 1. Wash and dry the peanut shells and crush them through a 100-mesh sieve. Take 10g of the sieved peanut shells and put them into 1mmol / L Fe(NO 3 ) 3 Magnetic stirring and impregnation in the solution for 24 hours, then vacuum filtration and drying; put the dried sample into a tube furnace, and raise the temperature to 100°C at a rate of 10°C / min under the protection of nitrogen at 50mL / min After calcination for 1 h, then increase the temperature at a rate of 5 °C / min to 400 °C for 2 h to obtain Fe 3 o 4 @biochar catalyst, the Fe 3 o 4 The SEM diagram and XRD diagram of @biochar catalyst are as follows figure 1 , figure 2 shown.

[0035] 2. Under the condition of stirring at 180 rev / min, mix 0.05g Fe 3 o 4 @biochar and 10mL0.4mol / kgClO 2 The solutions were sequentially added to 1 g of PAH-contaminated soil.

[0036] 3. Control t...

Embodiment 2

[0040] A method for oxidative remediation of polycyclic aromatic hydrocarbon-contaminated soil in industrial sites is as follows:

[0041] 1. Wash and dry the peanut shells and crush them through a 100-mesh sieve. Take 10g of the sieved peanut shells and put them into 1mmol / L Fe(NO 3 ) 3 Magnetic stirring and impregnation in the solution for 24 hours, then vacuum filtration and drying; put the dried sample into a tube furnace, and raise the temperature to 100°C at a rate of 10°C / min under the protection of nitrogen at 50mL / min After calcination for 1 h, then increase the temperature at a rate of 5 °C / min to 400 °C for 2 h to obtain Fe 3 o 4 @biocharcatalyst.

[0042] 2. Under the condition of stirring at 180 rev / min, mix 0.05g Fe 3 o 4 @ biochar and 10mL 0.2mol / kgClO 2 The solutions were sequentially added to 1 g of PAH-contaminated soil.

[0043] 3. Control the temperature of the above soil mixture to 25° C. and stir for 2 hours at a rotation speed of 180 rpm.

[0044...

Embodiment 3

[0047] A method for oxidative remediation of polycyclic aromatic hydrocarbon-contaminated soil in industrial sites is as follows:

[0048] 1. Wash and dry the peanut shells and crush them through a 100-mesh sieve. Take 10g of the sieved peanut shells and put them into 1mmol / L Fe(NO 3 ) 3 Magnetic stirring and impregnation in the solution for 24 hours, then vacuum filtration and drying; put the dried sample into a tube furnace, and raise the temperature to 100°C at a rate of 10°C / min under the protection of nitrogen at 50mL / min After calcination for 1 h, then increase the temperature at a rate of 5 °C / min to 400 °C for 2 h to obtain Fe 3 o 4 @biocharcatalyst.

[0049] 2. Under the condition of stirring at 180 rev / min, mix 0.08g Fe 3 o 4 @biochar and 10mL0.4mol / kgClO 2 The solutions were sequentially added to 1 g of PAH-contaminated soil.

[0050] 3. Control the temperature of the above soil mixture to 25° C. and stir for 2 hours at a rotation speed of 180 rpm.

[0051] ...

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Abstract

The invention relates to an iron-based biochar catalyst and an oxidative repairing method for polluted soil. The preparation method of the iron-based biochar catalyst comprises: 1) adding peanut shellpowder to a soluble iron salt solution, stirring, filtering, and drying to obtain a dried sample; and 2) carrying out high-temperature calcining on the dried sample to obtain a Fe3O4@biochar catalyst. The oxidative repairing method comprises: carrying out oxidative repairing on polycyclic aromatic hydrocarbon polluted soil in an industrial site by using Fe3O4@biochar as a catalyst and using ClO2as an oxidant. Compared with the prior art, the present invention has the following characteristics that the Fe3O4@biochar catalyst is prepared, and the new Fe3O4@biochar / ClO2 soil polycyclic aromatichydrocarbon catalytic oxidation system is constructed based on the catalyst, such that the oxidative repairing of polycyclic aromatic hydrocarbon polluted soil in industrial sites is achieved, a certain restrictive factor of the existing advanced oxidation systems can be avoided, the difficulty of poor effectiveness of soil polycyclic aromatic hydrocarbons in industrial sites can be overcome, polycyclic aromatic hydrocarbons in industrial sites can be efficiently oxidized, and no secondary pollution is generated to soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic polluted soil in industrial sites, and relates to an iron-based biochar catalyst and an oxidation repair method for polluted soil, in particular to a Fe 3 o 4 / Biochar synergistically catalyzes chlorine dioxide (ClO 2 ) Oxidative remediation method for PAH-contaminated soil in oxidative industrial sites. Background technique [0002] Due to the characteristics of high concentration, complex composition, long aging cycle, and proximity to residential areas, polluted soil on industrial sites has posed a serious threat to the health and living environment of surrounding people. Polycyclic aromatic hydrocarbons (PAHs) are the organic pollutants with the most sources and the widest distribution in the soil of industrial sites. The concentration of PAHs in the soil of most industrial sites has far exceeded the pollution control standard value. It is tightly bound to soil organic matter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C09K17/02B09C1/08
CPCB01J23/745C09K17/02B09C1/08
Inventor 胡晓钧马晓红孙远牛文珂
Owner SHANGHAI INST OF TECH