Sustained-release nano-calcium peroxide materials, preparation thereof, and method for removing chlorohydrocarbon and/or benzene series from underground water through sustained-release nano-calcium peroxide materials

A calcium peroxide, nanotechnology, applied in the directions of peroxide/peroxyhydrate/peroxyacid/superoxide/ozone, chemical instruments and methods, oxidized water/sewage treatment, etc., to achieve good dispersibility and Mobility, size uniformity, and the effect of improving repair efficiency

Pending Publication Date: 2020-02-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the existing advanced oxidation technology in the practice of remediation of polluted groundwater, provide an innovative slow-release nano-Fenton-like advanced oxidation material and its preparation technology, and provide a ferrous sulfide enhanced activation slow-release Nano calcium peroxide removes chlorinated hydrocarbons and benzene series in groundwater, so as to achieve efficient and long-lasting treatment of pollutants and reduce the cost of groundwater restoration in polluted sites

Method used

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  • Sustained-release nano-calcium peroxide materials, preparation thereof, and method for removing chlorohydrocarbon and/or benzene series from underground water through sustained-release nano-calcium peroxide materials
  • Sustained-release nano-calcium peroxide materials, preparation thereof, and method for removing chlorohydrocarbon and/or benzene series from underground water through sustained-release nano-calcium peroxide materials
  • Sustained-release nano-calcium peroxide materials, preparation thereof, and method for removing chlorohydrocarbon and/or benzene series from underground water through sustained-release nano-calcium peroxide materials

Examples

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Effect test

Embodiment 1

[0047] (1) At room temperature, accurately weigh 6g of commercially available anhydrous calcium chloride, add 60mL deionized water to a 500mL beaker, then measure 200mL polyethylene glycol (PEG200) solution, and finally add 30mL to a concentration of 1mol / L ammonia solution, after stirring evenly, place the mixed solution on a magnetic stirrer and stir at a constant speed of 600r / min. The solution contains a certain amount of ammonia, which can generate NH with HCl 4 Cl, promote CaO 2 The reaction formula is as follows:

[0048] 2HCl+2NH 3 →2NH 4 Cl;

[0049] (2) After the above solution is evenly stirred, add 25 mL of 30% H with a separating funnel at a rate of 3 s / drop 2 O 2 Aqueous solution into the system; with H 2 O 2 With the addition of the solution, the solution gradually changes from colorless to light yellow viscous liquid, which is nano-CaO 2 The slurry was then washed three times with absolute ethanol to remove impurities, and vacuum dried at 60°C for 8 hours to obtain...

Embodiment 2

[0053] (1) At room temperature, accurately weigh 6g of commercially available anhydrous calcium chloride, add 60mL of deionized water to a 500mL beaker, then measure 200mL of polyvinyl alcohol (PVA) solution, and finally add 30mL to a concentration of 1mol / After stirring the L ammonia solution evenly, place the mixed solution on a magnetic stirrer and stir at a constant speed of 600r / min. The solution contains a certain amount of ammonia, which can generate NH with HCl 4 Cl, promote CaO 2 The reaction formula is as follows:

[0054] 2HCl+2NH 3 →2NH 4 Cl;

[0055] (2) After the above solution is evenly stirred, add 25 mL of 30% H with a separating funnel at a rate of 3 s / drop 2 O 2 Aqueous solution into the system; with H 2 O 2 With the addition of the solution, the solution gradually changes from colorless to light yellow viscous liquid, which is nano-CaO 2 The slurry was then washed three times with absolute ethanol to remove impurities, and vacuum dried at 60°C for 8 hours to ob...

Embodiment 3

[0059] (1) At room temperature, accurately weigh 6g of commercially available anhydrous calcium chloride, add 60mL of deionized water to a 500mL beaker, then measure 200mL of diethylene glycol monoethyl ether (DEGMME) solution, and finally add 30mL concentration It is a 1mol / L ammonia solution. After stirring, the mixed solution is placed on a magnetic stirrer and stirred at a constant speed of 600r / min. The solution contains a certain amount of ammonia, which can generate NH with HCl 4 Cl, promote CaO 2 The reaction formula is as follows:

[0060] 2HCl+2NH 3 →2NH 4 Cl;

[0061] (2) After the above solution is evenly stirred, add 25 mL of 30% H with a separating funnel at a rate of 3 s / drop 2 O 2 Aqueous solution into the system; with H 2 O 2 With the addition of the solution, the solution gradually changes from colorless to light yellow viscous liquid, which is nano-CaO 2 The slurry was then washed three times with absolute ethanol to remove impurities, and vacuum dried at 60°C fo...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to sustained-release nano-calcium peroxide materials, preparation thereof, and a method for removing chlorohydrocarbon and benzene series from underground water by strengthening and activating the sustained-release nano-calcium peroxide materials through ferrous sulfide. By taking calcium chloride, hydrogen peroxide with the mass fraction being 30% and ammonium hydroxide with the mass fraction being 30% as raw materials and by adding different dispersing agents, an irreversible coagulation phenomenon is avoided in the synthesis process, then by adding different macromolecular polymers such as polyethylene glycol 400 (PEG400), polyvinyl alcohol (PVA) and diethylene glycol monoethyl ether (DEGMME), a film is formed on the surface of nCaO2, and through processes such as washing with water and ethyl alcohol and vacuum drying, the sustained-release nano-calcium peroxide advanced oxidation materials embedded with the various macromolecular polymers are obtained. By applying the oxidation materials, the purposes of efficient and lasting treatment of pollutants and lowering of the repair cost of the underground water in contaminated sites are achieved.

Description

Technical field [0001] The invention belongs to the technical field of water treatment, and specifically relates to a method for preparing a slow-release nanometer calcium peroxide material and strengthening and activating the material with ferrous sulfide to remove chlorinated hydrocarbons and benzene series in groundwater. Background technique [0002] In recent years, with the acceleration of urbanization and the deepening of the industrial structure, in order to alleviate the shortage of land resources and reduce environmental health risks, many cities have carried out the relocation and shutdown of polluting enterprises, and a large number of industrial polluted sites have appeared in cities and surrounding areas. , Which seriously affected the reuse of land. The treatment of contaminated soil and groundwater has become an environmental, economic and social issue that my country must face. How to avoid the harm to human health caused by the reuse of contaminated sites and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/043B82Y30/00C02F1/72C02F101/32C02F101/36C02F103/06
CPCC01B15/043B82Y30/00C02F1/722C02F1/725C02F2101/36C02F2101/322C02F2305/026C02F2103/06C01P2004/64C01P2004/62
Inventor 吕树光孙勇李明吕言臣孙雪城汤平姜文超黄靖瑶蒋希昊隋倩邱兆富
Owner EAST CHINA UNIV OF SCI & TECH
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