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Preparation method for slow-release type ferrate solid oxidizing agent and application of preparation method

A ferrate, slow-release technology, applied in chemical instruments and methods, iron compounds, oxidized water/sewage treatment, etc., can solve the problems of inconvenient storage and transportation, easy decomposition, waste, etc., and achieve good slow-release effect, The preparation process is simple and the promotion effect is promoted

Inactive Publication Date: 2016-01-20
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, ferrate is unstable and easy to decompose at room temperature, which is not convenient for storage and transportation; in some cases, the reaction rate of ferrate in water is too fast, and its decomposition products can catalyze the decomposition of ferrate; this leads to the ineffectiveness of part of ferrate Loss, causing waste, reducing the effect of water treatment, increasing the cost of drinking water treatment

Method used

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  • Preparation method for slow-release type ferrate solid oxidizing agent and application of preparation method
  • Preparation method for slow-release type ferrate solid oxidizing agent and application of preparation method
  • Preparation method for slow-release type ferrate solid oxidizing agent and application of preparation method

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Embodiment 1

[0025] In the embodiment of the present invention, a preparation method of slow-release ferrate solid oxidant, the specific steps are as follows:

[0026] (1) Weigh calcium chloride dihydrate, aluminum chloride hexahydrate, potassium ferrate solid and appropriate amount of sodium hydroxide according to the molar ratio of Ca:Al:Fe 1:1:1.

[0027] (2) Dissolve calcium chloride dihydrate and aluminum chloride hexahydrate in carbon dioxide-free deionized water to obtain solution A; dissolve potassium ferrate solid and appropriate amount of sodium hydroxide in another carbon dioxide-free deionized water to maintain Solution B was obtained at a pH of 12.

[0028] (3) Add the above two solutions into two continuous sampling pumps respectively, and inject them into the reaction vessel through the nozzle at the same time. During the above process, the flow rates of the two were controlled so that the pH value of the mixed solution in the reaction vessel was maintained at 13, and the s...

Embodiment 2

[0037] In the embodiment of the present invention, a preparation method of slow-release ferrate solid oxidant, the specific steps are as follows:

[0038] (1) Weigh calcium chloride dihydrate, aluminum chloride hexahydrate, potassium ferrate solid and appropriate amount of sodium hydroxide according to the molar ratio of Ca:Al:Fe 3:1:2.

[0039] (2) Dissolve calcium chloride dihydrate and aluminum chloride hexahydrate in carbon dioxide-free deionized water to obtain solution A; dissolve potassium ferrate solid and appropriate amount of sodium hydroxide in another carbon dioxide-free deionized water to maintain Solution B was obtained at a pH of 12.

[0040] (3) Add the above two solutions into two continuous sampling pumps respectively, and inject them into the reaction vessel through the nozzle at the same time. During the above process, the flow rates of the two were controlled so that the pH value of the mixed solution in the reaction vessel was maintained at 13, and the s...

Embodiment 3

[0047] In the embodiment of the present invention, a preparation method of slow-release ferrate solid oxidant, the specific steps are as follows:

[0048] (1) Weigh magnesium chloride hexahydrate, aluminum chloride hexahydrate, potassium ferrate solid and appropriate amount of sodium hydroxide according to the molar ratio of Mg:Al:Fe 3:2:2.

[0049] (2) Mix and dissolve magnesium chloride hexahydrate and aluminum chloride hexahydrate in deionized water without carbon dioxide to obtain solution A; dissolve potassium ferrate solid and appropriate amount of sodium hydroxide in another part of deionized water without carbon dioxide to maintain the pH value Solution B was obtained at 12.

[0050] (3) Add the above two solutions into two continuous sampling pumps respectively, and slowly inject them into the reaction vessel through the pipeline at the same time. During the above process, the flow rates of the two were controlled so that the pH value of the mixed solution in the rea...

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Abstract

The invention relates to a slow-release type ferrate solid oxidizing agent applied to the field of soil and water environment repair. According to the material, a layered metallic compound is formed by mixing a ferrate aqueous solution and a metal salt solution according to a certain ratio through a chemical hybridization method, and forming ferrate radical intercalation by keeping the pH value within a certain range. The product is mixed with a forming agent, and the ferrate solid oxidizing agent is obtained after granulating forming and drying are conducted. By means of layered metal compound interlayer microcosmic alkalinity, stability of ferrate can be remarkably enhanced, and the storage time of the ferrate solid oxidizing agent is remarkably longer than that of ordinary ferrate. Meanwhile, interlayer ferrate radicals are slowly released through the ion exchange effect, the slow-release effect of ferrate radicals in solutions is achieved, and loss caused to too fast decomposition in the water phase is reduced. The ferrate solid oxidizing agent prepared through a method can be used for long-acting removal of organic pollutant in soil and water environments.

Description

technical field [0001] The invention relates to a preparation method and application of an inorganic slow-release ferrate solid oxidizer, and relates to the technical field of soil and water environment restoration. Background technique [0002] Traditional drinking water treatment methods have no effective methods for refractory organic pollutants. With the intensification of water pollution, more and more types of pollutants need to be treated, which requires finding a method that can remove various pollutants, especially organic pollutants, without affecting the quality of drinking water. [0003] There have been studies on the use of ferrate in the field of water treatment, such as the use of ferrate to remove heavy metals and ammonia nitrogen or some aromatic compounds in water. The common feature is that ferrate can remove pollutants in water by using the strong oxidation of ferrate. While being oxidized, it is reduced to iron ions or iron hydroxides. Since these redu...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F1/72
CPCC01G49/009C01P2002/22C01P2002/72C02F1/72C02F2101/30C02F2305/00
Inventor 周吉峙舒伟康高原黄鑫苏曼钱光人
Owner SHANGHAI UNIV
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