Method for efficiently removing heavy metal pollutants on basis of fluorinated zero-valent iron

A technology of zero-valent iron and heavy metals, which is applied in the application field of preparation and removal of pollutants, can solve the problems of inability to improve the electronic selectivity of zero-valent iron, complex operation, etc., and achieve the effect of simple operation and low requirements for equipment

Active Publication Date: 2019-01-01
HUAZHONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the above zero-valent iron improvement technologies have complex operations, requ

Method used

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  • Method for efficiently removing heavy metal pollutants on basis of fluorinated zero-valent iron
  • Method for efficiently removing heavy metal pollutants on basis of fluorinated zero-valent iron
  • Method for efficiently removing heavy metal pollutants on basis of fluorinated zero-valent iron

Examples

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Effect test

example 1

[0020] Example 1. First prepare 50mL of 0.01M sodium fluoride solution in a 100mL beaker, add 0.005M sodium petroleum sulfonate solution, and add 0.56g of zero-valent iron. React at 25°C for 60min, then wash with deionized water and ethanol three times respectively, filter the sample, and dry it in a vacuum oven at 25°C for 18h; L, the dosage of zero-valent iron fluoride is 2g / L, after 90 minutes of reaction, the removal rate of chromium reaches 99%, the electron selectivity of the original zero-valent iron is about 2.3%, and the electron selectivity after modification is as high as 23%. , the removal rate of chromium is still as high as 95% after 5 cycles.

example 2

[0021] Example 2. First prepare 50mL of 1M hydrofluoric acid solution in a 100mL beaker, add 0.001M sodium dodecylbenzenesulfonate solution, and add 3g of zero-valent iron. React at 25°C for 90min, then wash with deionized water and ethanol three times respectively, the sample is filtered and dried in a vacuum drying oven at 25°C for 12h; L, the dosage of zero-valent iron fluoride is 2g / L, after 30 minutes of reaction, the removal rate of chromium reaches 99%, the electron selectivity of the original zero-valent iron is about 2.3%, and the electron selectivity after modification is as high as 25%. , the removal rate of chromium is still as high as 93% after 5 cycles.

example 3

[0022] Example 3. First prepare 50mL of 0.05M trifluoroacetic acid solution in a 100mL beaker, add 0.0001M sodium tridecylsulfonate solution, and add 5.6g of zero-valent iron. React at 25°C for 120min, then wash with deionized water and ethanol three times respectively, the sample is filtered and dried in a vacuum oven at 25°C for 16h; under aerobic conditions, the rotation speed is 200 rpm, and the initial concentration of hexavalent chromium is 5mg / min. L, the dosage of zero-valent iron fluoride is 2g / L, after 30 minutes of reaction, the removal rate of chromium reaches 99%, the electron selectivity of the original zero-valent iron is about 2.3%, and the electron selectivity after modification is as high as 32%. , the removal rate of chromium is still as high as 96% after 5 cycles.

[0023] The zero-valent iron in the above-mentioned Examples 1-3 is micron-sized zero-valent iron.

[0024] The contact angle results of original zero-valent iron and modified zero-valent iron (...

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Abstract

The invention relates to a method for efficiently removing heavy metal pollutants on the basis of fluorinated zero-valent iron. The fluorinated zero-valent iron is characterized in that part of hydroxyl groups on the surface of zero-valent iron are substituted by fluorine or a fluorine-containing group and a sulfonic acid surfactant group. The usage is as follows: the fluorinated zero-valent ironis added into heavy metal pollutant water to remove heavy metals. The fluorinated zero-valent iron provided by the invention has good transfer capability, high electron selectivity and high utilization rate, and when being used for removing heavy metal pollutants, the fluorinated zero-valent iron has the advantages of high pollutant removal efficiency, easiness in operation and cost-efficiency.

Description

technical field [0001] The invention belongs to the fields of preparation of environmental materials and restoration of pollutants in water bodies, and in particular relates to the preparation of zero-valent iron fluoride and its application for removing pollutants. Background technique [0002] Compared with other chromium pollution remediation technologies, zero-valent iron technology has the characteristics of low cost, environmental friendliness and simple operation, and has received more and more attention in the field of remediation of heavy metal chromium-polluted water bodies. After more than 20 years of basic research and application development, zero-valent iron technology has excellent effects in treating heavy metal chromium ions in some actual water bodies, but there are still challenges in its wide application. For example, micron-sized zero-valent iron has the problem of low activity, which is manifested by low electron transfer efficiency, poor electron selec...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/22
CPCC02F1/70C02F2101/22
Inventor 张礼知彭星王谦贾法龙廖敏子
Owner HUAZHONG NORMAL UNIV
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