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Persulfate activator and application thereof in activating persulfate to remove pentachlorophenol

A technology of persulfate and pentachlorophenol is applied in the field of chemical oxidation remediation of organic polluted soil, which can solve the problems of stimulating persulfate oxidizing property, difficult preservation of transition metal ions, high cost, etc. Significant repair effect and low cost effect

Active Publication Date: 2022-04-19
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to stimulate the oxidation of persulfate to the greatest extent by a single activation method. Some of them only stay in the laboratory research, and it is difficult to apply them on a large scale. Some transition metal ions are difficult to preserve and the cost is relatively high. expensive

Method used

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  • Persulfate activator and application thereof in activating persulfate to remove pentachlorophenol
  • Persulfate activator and application thereof in activating persulfate to remove pentachlorophenol

Examples

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Embodiment 1

[0031] The present embodiment provides a persulfate activator, comprising the following components by weight: 30-50 parts of lime powder, 10-15 parts of quartz stone powder, 10-15 parts of marble powder, 17-20 parts of vermicularite powder, 5-10 parts of muscovite stone powder and 5-10 parts of activated carbon powder.

[0032] It should be noted that during the use of lime powder, a certain amount of heat is released, which breaks the O-O bond of persulfate to produce SO 4 .- . Lime powder can also increase soil pH, and SO 4 - with OH - reaction generation . OH is more oxidizing. Quartz stone powder is an important part of the persulfate activator. Si in the quartz stone powder interacts with transition metal ions through dangling bonds, increasing the chance of contact between transition metal ions and persulfate. Marble powder and muscovite stone powder play a structural auxiliary role in the activator, so that the functional components can be aggregated together to ...

Embodiment 2

[0038] This example provides a method for preparing the persulfate activator as described in Example 1. Each component is subjected to heat preservation and curing respectively, then pulverized and sieved, stirred and mixed according to the corresponding parts by weight to obtain powdered persulfuric acid Salt Activator.

[0039] In this embodiment, the heat preservation and curing are as follows: after mixing the components, place them at 50-70° C. for at least 3 days, which is beneficial to activate the key functional groups in each component and form a chemical structure that activates persulfate.

[0040] In this embodiment, the crushing and sieving is: respectively crushing the components after heat preservation and curing and passing through a 100-mesh sieve. Crushing and sieving can increase the surface area of ​​the activator, which is conducive to fully combining with persulfate and exerting its effect;

[0041] In this embodiment, in the stirring and mixing, the sti...

Embodiment 3

[0043] This embodiment provides an application of using the persulfate activator described in Example 1 to activate persulfate to remove pentachlorophenol, including: after pretreatment of pentachlorophenol-contaminated soil, use persulfate activator and persulfuric acid The salt was mixed and applied to pentachlorophenol-contaminated soil.

[0044] In this embodiment, the pretreatment process is: drying and sieving the pentachlorophenol-contaminated soil.

[0045] In this embodiment, the total mass of persulfate activator and persulfate is 1-3% of the mass of pentachlorophenol-contaminated soil, and the mass ratio of persulfate activator and persulfate is 3:1.

[0046] In this example, the pentachlorophenol-contaminated soil applied with persulfate activator and persulfate was mixed with water and stirred evenly, and the moisture content was controlled to be about 45%, and it was left for 3-5 days for stabilization and maintenance.

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Abstract

The invention discloses a persulfate activator and application thereof in activating persulfate to remove pentachlorophenol, and belongs to the technical field of chemical oxidation remediation of organic contaminated soil. The activating agent comprises lime powder, quartz stone powder, marble powder, vermicular chlorite powder, muscovite powder and activated carbon powder. The persulfate activator disclosed by the invention can be used at normal temperature, and compared with a common persulfate activation method, the persulfate activator disclosed by the invention has the advantages of various activation modes, better activation effect, capability of improving the soil structure and no secondary pollution. In addition, the adopted raw materials are easy to obtain and low in cost, and the method has a wide application prospect in the aspect of treating the organic contaminated soil by activating the persulfate.

Description

technical field [0001] The invention belongs to the technical field of chemical oxidation restoration of organic polluted soil, and in particular relates to a persulfate activator and the application of activating persulfate to remove pentachlorophenol. Background technique [0002] In recent years, pentachlorophenol (PCP) polluted soil has become the focus of organic pollution control. Pentachlorophenol is not easy to be oxidized, difficult to hydrolyze, and difficult to volatilize. Its pollution sources are mainly organic chlorine such as pesticides and herbicides. The use and degradation of pesticides, as well as the chlorination process of sewage treatment plants. According to statistics, the annual production and use of chemical organochlorine pesticides in the world has reached millions of tons. These organochlorine pesticide pollutants are "carcinogenic, teratogenic, and mutagenic" Long-distance migration, it has received widespread attention. [0003] Organic pollu...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 揭雨成蒋俊揭红东马玉申
Owner HUNAN AGRICULTURAL UNIV
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