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Method for preparing nano calcium peroxide by chemical modification

A calcium peroxide, chemical modification technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, inorganic chemistry, etc. The effect of increasing adsorption sites, large specific surface area, and more reaction sites

Inactive Publication Date: 2014-02-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the technical problems of traditional calcium peroxide particle size being large, easy to agglomerate, and easy to block pipelines in actual repair applications, the purpose of the present invention is to provide a method for chemically modifying and preparing nano-scale calcium peroxide, thereby optimizing Performance of traditional calcium peroxide

Method used

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  • Method for preparing nano calcium peroxide by chemical modification
  • Method for preparing nano calcium peroxide by chemical modification
  • Method for preparing nano calcium peroxide by chemical modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Accurately weigh 6g of calcium hydroxide, dissolve it in 120mL of deionized water, and stir to form a calcium hydroxide suspension. Weigh 0.96 g (that is, 16% of the mass fraction of calcium hydroxide) of polyvinyl alcohol into the suspension, and ultrasonically and mechanically stir for 50 minutes at room temperature to fully mix the above substances to form an inorganic-polymer reaction substrate.

[0028] (2) 63.46mL30% hydrogen peroxide was added to a 100mL headspace bottle, sealed with a capper, inserted into a burette with a controllable flow rate and slowly dripped into the bottom liquid. The reaction was carried out under low temperature conditions with constant uniform stirring. After the dripping is completed, the reaction is continued for 15 minutes to fully react the calcium salt and hydrogen peroxide to form stable nano-scale calcium peroxide particles.

[0029] (3) The formed precipitate is centrifuged, and the product is washed with deionized water and iso...

Embodiment 2

[0032] (1) Accurately weigh 6g of calcium hydroxide, dissolve it in 120mL of deionized water, and stir to form a calcium hydroxide suspension. Weigh 0.48g (ie 8% of the mass fraction of calcium hydroxide) polyvinyl alcohol and add it to the suspension, ultrasonically and mechanically stir for 30min at room temperature to fully mix the above-mentioned substances to form an inorganic-polymer reaction substrate.

[0033] (2) 63.46mL30% hydrogen peroxide was added to a 100mL headspace bottle, sealed with a capper, inserted into a burette with a controllable flow rate and slowly dripped into the bottom liquid. The reaction was carried out under low temperature conditions with constant uniform stirring. After the dripping is completed, the reaction is continued for 20 minutes to make the calcium salt and hydrogen peroxide fully react to form stable nano-scale calcium peroxide particles.

[0034] (3) The formed precipitate is centrifuged, and the product is washed with deionized water and...

Embodiment 3

[0037] (1) Accurately weigh 6g of calcium hydroxide, dissolve it in 120mL of deionized water, and stir to form a calcium hydroxide suspension. Weigh 0.24g (ie 4% of the mass fraction of calcium hydroxide) of sodium polyacrylate into the suspension, ultrasonically and mechanically stir for 50 minutes at room temperature to fully mix the above substances to form an inorganic-polymer reaction substrate.

[0038] (2) 63.46mL30% hydrogen peroxide was added to a 100mL headspace bottle, sealed with a capper, inserted into a burette with a controllable flow rate and slowly dripped into the bottom liquid. The reaction was carried out under low temperature conditions with constant uniform stirring. After the dripping is completed, the reaction is continued for 15 minutes to fully react the calcium salt and hydrogen peroxide to form stable nano-scale calcium peroxide particles.

[0039] (3) The formed precipitate is centrifuged, and the product is washed with deionized water and isopropanol, ...

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Abstract

The invention relates to a method for preparing nano calcium peroxide by chemical modification. The method comprises the following steps: adding a certain amount of dispersing agent into a prepared calcium salt water solution, and mixing under ultrasonic conditions to prepare a bottom solution; slowly and dropwisely adding oxydol with a certain concentration into the continuously stirred bottom solution, reacting in an ice water bath, and continuing the reaction for 15-20 minutes after the dropwise addition is completed; and centrifugating the mixed solution, repeatedly washing the precipitate with deionized water and isopropanol, and drying in a vacuum drying oven for 12-24 hours to obtain the nano calcium peroxide. The method has the advantages of simple technique, mild reaction conditions and short reaction time; the dispersing agent added in the reaction process is nontoxic and harmless, and thus, no pollutant is generated in the production process; and the prepared product has favorable properties, and the particle size of the nano calcium peroxide is 100nm or so. The invention provides a simple effective new way for preparing nano calcium peroxide.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, relates to a repair technology of contaminated groundwater, and specifically is a preparation method of chemically modified nano-level calcium peroxide. Background technique [0002] In recent years, the ecological safety and public health threats caused by groundwater pollution have received great attention. Among the many pollutants, pollution caused by petroleum components and heavy metals is the top priority of the public. These pollutants are generally toxic, easy to accumulate in the human body, and difficult to remove once they enter the environment, so they are increasingly becoming the focus of research. According to statistics, the world leaks 10 million tons of crude oil each year through different channels, and the various oily wastewater discharged from oilfield development exceeds 30 million tons. [1] . In our country, pollution accidents caused by petroleum-based subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/043C02F1/72C02F1/28B82Y30/00
Inventor 周雪飞张亚雷钱雅洁张静陈家斌高海萍
Owner TONGJI UNIV
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