Contaminated soil remediation method
A technology of contaminated soil and remediation method, applied in the field of remediation of contaminated soil, can solve the problems of high processing cost, large area, long reaction period, etc., and achieve the effects of simple operation, strong adaptability and strong oxidative activity
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preparation example 1
[0070] This preparation example provides a transition metal tetraamide-based macrocyclic ligand oxidation catalyst, which is prepared by the following method:
[0071] (1) In a 500mL round-bottomed flask, add 70mL of triethylamine into the ethanol solution, and use the ethanol solution to adjust the volume to 300mL; In the ethanol solution, heat at 60°C in a water bath, and use magnetic stirring under reflux at a speed of 800rpm to obtain a mixed solution A; in another 500mL round bottom flask, mix 52g dimethylmalonic acid with 211.5 g dicycloethylcarbodiimide was mixed in 300mL ethanol solution to obtain mixed solution B.
[0072] (2) Add the mixed solution B dropwise to the mixed solution A at a speed of 1 drop per second, and stir at a speed of 800rpm for 5h; After stirring, the solution was stirred for another 4h after the addition, and allowed to settle for 24h.
[0073] (3) Add deionized water to the above solution drop by drop until the top layer of the crystal is dis...
Embodiment 1
[0078] The present embodiment provides a kind of remediation method of polluted soil, comprises the steps:
[0079] The soil is repaired by leaching, and the soil is leached 3 times with tap water. Each leaching uses 20 times the tap water of the soil volume to obtain the leaching waste liquid, and the transition metal tetraamide prepared in Preparation Example 1 is added thereto. Based macrocyclic ligand oxidation catalyst and hydrogen peroxide, the concentration of the transition metal tetraamide-based macrocyclic ligand oxidation catalyst in the leaching waste liquid is 15 μmol / L, and the hydrogen peroxide in the rinsing waste liquid The concentration in the solution was 25 g / L, and the reaction was carried out at 25° C. and a pH value of 10.5 for 150 min. After the reaction, the residual cyanide concentration in the soil sample was detected by a spectrophotometer, and the removal rate was calculated.
Embodiment 2
[0081] The present embodiment provides a kind of remediation method of polluted soil, comprises the steps:
[0082] The soil is repaired by leaching, and the soil is leached 5 times with tap water. Each leaching uses tap water 20 times the volume of the soil to obtain the leaching waste liquid, and the transition metal tetraamide prepared in Preparation Example 1 is added thereto. Based macrocyclic ligand oxidation catalyst and hydrogen peroxide, the concentration of the transition metal tetraamide-based macrocyclic ligand oxidation catalyst in the leaching waste liquid is 10 μmol / L, and the hydrogen peroxide in the rinsing waste liquid The concentration in the solution was 40 g / L, and the reaction was carried out at 20° C. and a pH value of 8.5 for 180 min. After the reaction, the residual cyanide concentration in the soil sample was detected by a spectrophotometer, and the removal rate was calculated.
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