To prepare contaminated soil, mix a selected soil type with organic pollutants dissolved in a solvent, ensuring even distribution, and allow the mixture to incubate for 1-2 weeks. Afterward, characterize the soil to confirm pollutant concentrations before applying nanomaterials for degradation studies.

Select a suitable organic solvent to dissolve the target pollutant, then mix the above solution evenly in the soil, wait for the reagent to evaporate at room temperature under the shade, and then age naturally for 2 weeks or one month until the pollutant concentration is more stable.

It should be noted that the organic solution should be easy to volatilize, and the soil should be dried and sterilized in advance.