METHOD OF PRODUCING IRON (III) OXIDE NANOSPHERES Russian patent published in 2020 - IPC C01G49/06 B01J19/12 B82B3/00 B82Y40/00 

FIELD: technological processes.

SUBSTANCE: invention relates to the technology of producing iron (III) oxide α-Fe₂O₃ nanoparticles, which can be used as a pigment, catalyst, a sensitiser of solar cells, efficient anode material of chemical current sources, a gas-sensitive sensor for determining ethanol vapor C₂H₅OH, carbon monoxide CO, hydrogen H₂, composite adsorption material for purification of waste water from water-soluble dyes. Method of producing iron (III) oxide α-Fe₂O₃ nanoparticles involves microwave irradiation by heating an aqueous solution of ferric chloride hexahydrate FeCl₃·6H₂O and a compound containing ammonium ion, washing and drying, wherein the compound containing the ammonium ion used is ammonium dihydro-orthophosphate NH₄H₂PO₄ and additionally sodium sulphate Na₂SO₄ with molar ratio of components equal to FeCl₃⋅6H₂O:NH₄H₂PO₄:Na₂SO₄=40:0.25:1, in an aqueous solution at a ratio of s:l=0.5491:90÷110, and microwave irradiation is carried out at temperature of 200–220 °C for 5–20 minutes with power of 17–19 W under pressure of 10–20 bar with constant stirring at speed of 100–300 rpm.

EFFECT: invention enables to obtain iron (III) oxide particles of rhombohedral system having a spherical shape with diameter of 80 nm using a simple and process method.

1 cl, 2 dwg, 3 ex