Preparation method and application of iron-doped polypyrrole microsphere adsorbent

The invention provides a preparation method and application of an iron-doped polypyrrole microsphere adsorbent. The method comprises the following steps: adding ferric trichloride hexahydrate, sodium acetate and ethylene glycol into a container, stirring and dissolving to form a solution, adding hexadecyl trimethyl ammonium bromide and polyacrylic acid, carrying out ultrasonic dispersion, transferring into a high-pressure reaction kettle, carrying out constant-temperature reaction and filtering to obtain black powder, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying to obtain ferroferric oxide; mixing the obtained ferroferric oxide with absolute ethyl alcohol, performing ultrasonic dispersion, adding an alcoholic solution of a pyrrole monomer, performing ultrasonic dispersion, adding hydrochloric acid, performing ultrasonic reaction, adding deionized water, continuing ultrasonic reaction, and then performing centrifugal separation, washing and vacuum drying to obtain the