Biodegradable sodium persulfate microcapsule as well as preparation method and application thereof

The invention belongs to the technical field of soil pollution remediation, and particularly relates to a biodegradable sodium persulfate microcapsule as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a water-phase solution formed by a chitosan acetic acid water solution and sodium persulfate with an oil-phase solution containing an emulsifier, dispersing the water-phase solution in an oil phase in the form of droplets to form a water-in-oil system, and carrying out cross-linking curing and organic solvent elution to obtain a water-in-oil system which takes chitosan as a wall material and takes sodium persulfate as an emulsifier. And the biodegradable sodium persulfate microcapsule is coated with sodium persulfate. Due to the fact that chitosan has good adsorbability, the biodegradable sodium persulfate microcapsule can adsorb polycyclic aromatic hydrocarbon pollutants in soil; active groups generated by activation of sodium persulfate have s