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
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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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