Preparation method of catalyst for oxidative degradation of fluorine-containing wastewater by microwave-activated persulfate
A technology of persulfate oxidation and microwave activation, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of poor persulfate catalytic ability, microwave response The problem of low degree of degradation and limited degradation ability can achieve the effect of good recyclability, good wave absorption, and improved oxidation capacity.
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Embodiment 1
[0027] In this example, the cobalt-modified bismuth ferrite-supported nickel foam composite catalyst is used as the catalyst, the persulfate system is activated by microwaves, and perfluorooctanoic acid is selected as the target pollutant. The specific technical scheme is as follows:
[0028] 1. Synthesis of cobalt-modified bismuth ferrite-supported foam nickel composite catalyst
[0029] Add 2.0g of ferric nitrate, 0.5g of cobalt nitrate, 3.0g of bismuth nitrate and 1.0g of dispersant into 10mL of deionized water or ultrapure water, mix and stir, add 1.2g of nickel foam and drop by drop 2.0g of 0.5mol / L After the sodium hydroxide solution, continue to stir for 14 minutes, then synthesize in a microwave reactor, set the reaction time to 40 minutes, and the reaction temperature to 180°C. After the reaction is completed, the synthesized material is washed alternately with anhydrous ethanol and deionized water twice , and finally transferred to an oven for drying at 70oC for 4 ho...
Embodiment 2
[0033] In this example, the cobalt-modified bismuth ferrite-supported nickel foam composite catalyst is used as the catalyst, the persulfate system is activated by microwaves, and perfluoroheptanoic acid is selected as the target pollutant. The specific technical scheme is as follows:
[0034] 1. Synthesis of cobalt-modified bismuth ferrite-supported foam nickel composite catalyst
[0035] Add 3.0g of ferric nitrate, 0.5g of cobalt nitrate, 5.0g of bismuth nitrate and 3.0g of dispersant into 20mL of deionized water or ultrapure water, mix and stir, add 1.5g of nickel foam and add 4g of hydrogen with a concentration of 0.2mol / L drop by drop Sodium oxide continued to stir for 12 minutes, and then synthesized in a polytetrafluoroethylene reactor. Set the reaction time to 300 minutes, and the reaction temperature was 180°C. After the reaction was completed, the synthesized material was washed alternately with anhydrous ethanol and deionized water for 4 times. Finally, transfer to ...
Embodiment 3
[0039] In this example, the cobalt-modified bismuth ferrite-supported nickel foam composite catalyst is used as the catalyst, the persulfate system is activated by microwaves, and perfluorooctanoic acid and perfluorooctanoic acid are selected as the target pollutants. The specific technical scheme is as follows:
[0040] 1. Synthesis of cobalt-modified bismuth ferrite-supported foam nickel composite catalyst
[0041] Add 6.0g of ferric nitrate, 1.0g of cobalt nitrate, 5.0g of bismuth nitrate and 3.0g of dispersant into 20mL of deionized water or ultrapure water, mix and stir, add 1.5g of nickel foam and add 5.0g of 0.2mol / L The sodium hydroxide continued to stir for 14 minutes, and then synthesized in a microwave reactor. The reaction time was set to 30 minutes, and the reaction temperature was 190°C. Dry it in an oven at 70° C. for 4 hours to obtain a cobalt-modified bismuth ferrite-supported foamed nickel composite catalyst.
[0042] 2. Microwave activation
[0043]Add 0.1...
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