A method for efficient removal of heavy metal pollutants based on zero-valent iron fluoride

A zero-valent iron and heavy metal technology, applied in the field of preparation and removal of pollutants, can solve the problems of inability to improve the selectivity of zero-valent iron electrons, complicated operation, etc., and achieve high utilization rate, simple operation and fast electron release Effect

Active Publication Date: 2021-07-20
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above zero-valent iron improvement technologies have complex operations, require additional equipment, or cannot improve the electronic selectivity of zero-valent iron.

Method used

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  • A method for efficient removal of heavy metal pollutants based on zero-valent iron fluoride
  • A method for efficient removal of heavy metal pollutants based on zero-valent iron fluoride
  • A method for efficient removal of heavy metal pollutants based on zero-valent iron fluoride

Examples

Experimental program
Comparison scheme
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 based on zero-valent iron fluoride. The zero-valent iron fluoride is characterized in that part of the hydroxyl groups on the surface of the zero-valent iron are replaced by fluorine or fluorine-containing groups, and by sulfonic acid surfactant groups. Usage method: add the above-mentioned zero-valent iron fluoride into the water body polluted by heavy metals to remove heavy metals. The zero-valent iron fluoride provided by the invention has good transmission capacity, high electron selectivity and high utilization rate, and has the advantages of high pollutant removal efficiency, simple operation and high cost efficiency when used for the removal of heavy metal pollutants.

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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Patent Type & Authority Patents(China)
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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