Method for catalyzing hydrogen peroxide by goethite to oxidize and degrade polychlorinated biphenyl in water
A technology of hydrogen peroxide and polychlorinated biphenyls, applied in the field of environmental remediation, to achieve the effect of pH value drop and good stability
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Embodiment 1
[0016] 2,4,4′-Trichlorobiphenyl (PCB28) was selected as the target compound. Weigh a certain amount of goethite into a 40 mL brown glass bottle, add PCB28 stock solution with a sampling needle, add hydrogen peroxide aqueous solution, adjust the pH of the system to 3, and finally the concentration of PCB28 in the solution is 100 μg / L. The concentration of ore is 10 g / L, and the concentration of hydrogen peroxide is 1.0 mol / L. Cover the lid with a Teflon liner, put the reaction bottle into a constant temperature shaker, set the temperature at 25°C, and rotate at 150 r / min, and avoid light for reaction. Regularly sample and extract residual PCB28 in the system, and use GC-ECD for qualitative and quantitative analysis. The results showed that the degradation rate of PCB28 was more than 98 % after shaking for 96 h. Under the same conditions, changing the concentration of goethite to 0.5 g / L, 1.0 g / L, 5.0 g / L, the degradation rates of PCB28 were 61.7 %, 76.4 %, 85.4 %. It can be ...
Embodiment 2
[0018] 2,4,4′-Trichlorobiphenyl (PCB28) was selected as the target compound. Weigh a certain amount of goethite into a 40 mL brown glass bottle, add PCB28 stock solution with a sampling needle, add hydrogen peroxide aqueous solution, add hydrogen peroxide aqueous solution, adjust the pH of the system to 3, and finally the concentration of PCB28 in the solution is 100 μg / L , the concentration of goethite is 1.0 g / L, and the concentration of hydrogen peroxide is 1.0 mol / L. Cover the lid with a Teflon liner, put the reaction bottle into a constant temperature shaker, set the temperature at 25°C, and rotate at 150 r / min, and avoid light for reaction. Regularly sample and extract residual PCB28 in the system, and use GC-ECD for qualitative and quantitative analysis. The results showed that the degradation rate of PCB28 was 76.4 % after shaking for 96 h. Under the same conditions, changing the concentration of hydrogen peroxide to 0.2 mol / L, 0.5 mol / L, 2.0 mol / L, the removal rate ...
Embodiment 3
[0020] 2,4,4′-Trichlorobiphenyl (PCB28) was selected as the target compound. Weigh a certain amount of goethite into a 40 mL brown glass bottle, add PCB28 stock solution with a sampling needle, add hydrogen peroxide aqueous solution, adjust the pH of the system to 3, and finally the concentration of PCB28 in the solution is 100 μg / L, and the goethite The concentration of hydrogen peroxide is 1.0 g / L, and the concentration of hydrogen peroxide is 1.0 mol / L. Cover the lid with a Teflon liner, put the reaction bottle into a constant temperature shaker, set the temperature at 25°C, and rotate at 150 r / min, and avoid light for reaction. Regularly sample and extract residual PCB28 in the system, and use GC-ECD for qualitative and quantitative analysis. The results showed that the degradation rate of PCB28 was 76.4 % after shaking for 96 hours. Under the same conditions, changing the pH value of the system to 5, 7, and 8, the degradation rates of PCB28 obtained were 64.7%, 57.9%, a...
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