Environment-friendly Cr (VI) contaminated soil remediation agent and preparation method thereof

The invention provides an environment-friendly Cr (VI) contaminated soil remediation agent and a preparation method thereof. The method comprises the following steps: dissolving chitosan in a mixed solvent formed by glacial acetic acid and methyl alcohol, then adding a pyrrole monomer and an oxidizing agent FeCl3 in sequence, forming polypyrrole from the pyrrole monomer to coat the surface of the chitosan, placing the prepared chitosan/polypyrrole mixed solution in a refrigerator overnight, and refrigerating; and adding the chitosan/polypyrrole mixed solution into a precipitant prepared from absolute ethyl alcohol and ethyl acetate until black flocculent substances are separated out, and centrifugally washing and freeze-drying the black flocculent substances to obtain the remediation agent. The remediation agent is conveniently applied to remediation of Cr (VI) contaminated soil, has a spongy microstructure and developed porosity, can also play a role in reduction while adsorbing Cr < 6 + >, does not affect t