Fe-Mn system adsorbent and preparation and application method of Fe-Mn system adsorbent

The invention discloses a Fe-Mn system adsorbent and a preparation and application method of Fe-Mn system adsorbent. The Fe-Mn system adsorbent is obtained by taking Fe and manganese dioxide as raw materials, performing ball grinding on a Fe-Mn system mixture in a water medium under the activation action of a mechanical ball grinder, taking out a product after ball grinding is performed for proper time, adjusting the pH value to 4-6, and performing aging, filtering, drying, grinding and screening. The adsorbent is high in adsorption performance on arsenic, is high in adsorption capacity and has a certain adsorption effect on other heavy metal ions. The adsorbent is easy to settle, and solid-liquid separation is convenient.