▎ 摘　　要

NOVELTY - Method for treating thallium-containing wastewater, involves (a) preparing magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide, persulfate, (b) obtaining a sample of thallium-containing wastewater, and determining concentration and pH of thallium, (c) calculating and verifying optimal dosage of magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide, persulfate, and (d) placing magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide, persulfate in thallium-containing wastewater, and adsorbing and oxidizing thallium(I) to thallium(III) to remove thallium(I) in wastewater, coating with ferric oxide with titanium dioxide nanoparticles on surface, combining reduced graphene oxide nanosheets with mesopores and combining with nanosheets to form a composite structure, magnetically reducing, and adsorbing ferric oxide and titanium dioxide. USE - The method is used for treating thallium-containing wastewater. ADVANTAGE - The method adopts a small amount of adsorbent, ensures strong adsorption capacity for thallium, and has large capacity, high efficiency, and low cost. DETAILED DESCRIPTION - Method for treating thallium-containing wastewater, involves (a) preparing magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide, persulfate, (b) obtaining a sample of thallium-containing wastewater, and determining concentration and pH of thallium in the sample, (c) calculating and verifying the optimal dosage of magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide, persulfate, and (d) placing the magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide, persulfate in the thallium-containing wastewater according to the optimal dosage, where the reduced graphene oxide-ferric oxide-loaded titanium dioxide effectively activates persulfate to generate sulfate ion radicals through its carboxyl group and iron(II) in the magnetic particles, and quickly adsorbing and oxidizing thallium(I) to thallium(III) and make precipitate to efficiently remove thallium(I) in wastewater, coating the magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide which is a core-shell solid particle with ferric oxide as core with titanium dioxide nanoparticles on the surface, combining the reduced graphene oxide nanosheets with mesopores as the carrier and combining with the nanosheets to form a composite structure, magnetically reducing graphene oxide nanocomposite reduced graphene oxide-ferric oxide-loaded titanium dioxide, and adsorbing both ferric oxide and titanium dioxide on the covalent bond of reduced graphene oxide, where the titanium dioxide coating layer prevents ferric oxide from being oxidized, and the hydroxyl group of the composite material is the main binding site for thallium(I) adsorption and its specific surface area is large, and the hydroxyl and carboxyl active groups enhance its surface chemical activity and improve its adsorption capacity for thallium(I). The magnetic adsorbent reduced graphene oxide-ferric oxide-loaded titanium dioxide is prepared by (i) dispersing 5 mg reduced graphene oxide-ferric oxide composite material in 50 ml absolute ethanol, adding 0.3 ml aqueous ammonia and ultrasonically processing for 20 minutes, placing in a 45 degrees C water bath, and uniformly stirring at 450 rpm, (ii) dissolving 1.5 ml tetrabutyl titanate in 20 ml absolute ethanol under magnetic stirring to prepare a pale yellow titanium dioxide precursor, (iii) dripping ethanol solution of tetrabutyl titanate to the dispersion solution of reduced graphene oxide-ferric oxide, performing heat treatment at 180 degrees C for 48 hours, and perfroming magnetic separation to obtain solid particles, namely core-shell reduced graphene oxide-ferric oxide-loaded titanium dioxide, and (iv) washing with pure water and absolute ethanol for 3 times, and drying in vacuum at 60 degrees C for 12 hours to obtain magnetically reduced graphene oxide nanocomposite.