Nano adsorbent for removing arsenic, stibium and fluorin in wastewater as well as preparation method and regeneration method of nano adsorbent

The invention discloses a nano adsorbent for removing arsenic, stibium and fluorin in wastewater as well as a preparation method and regeneration method of the nano adsorbent, belonging to the technical field of wastewater treatment. The nano adsorbent is prepared by pretreating macroporous cation exchange resin with a conventional method for acid and alkali treatment on new resin at first, and then sequentially carrying out the following processes of: soaking by using ammonium ceric nitrate and a ferrate solution; performing soaking restoration by using a mixed solution containing ferrite and hydrochloric acid; soaking by using a sodium hydroxide solution, and then performing chemical reaction inside a macroporous resin material to generate nano ferric oxide hydrate and ceric oxide hydrate precipitate particles; and drying and dehydrating for 3 hours at 50 DEG C to obtain an adsorbent loaded with nano ferric oxide hydrate and ceric oxide hydrate. The adsorbent disclosed by the invention can be used for elimi