METHOD OF SORPTION EXTRACTION OF CHROMIUM (VI) FROM AQUEOUS SOLUTIONS Russian patent published in 2021 - IPC C22B34/32 C22B3/24 C02F101/22 C02F1/32 

FIELD: technological processes.

SUBSTANCE: invention relates to extraction of substances using sorbents, particularly use of inorganic materials for extraction from aqueous solutions of toxic compounds of chromium (VI). Sorption extraction of chromium (VI) from aqueous solutions involves treatment of the solution with an inorganic sorbent based on titanium dioxide under the action of ultraviolet radiation with subsequent separation of the sorbent. Solution is treated at pH 5.0 in an acetate buffer medium. Sorbent used is mechanically activated titanium dioxide with particle size of not more than 20 nm of rutile modification with ratio sorbent : solution 1:30÷60 for 1.5–3.0 hours. Sorbent is separated by coagulation with potassium dihydrophosphate (KH₂PO₄) while heating to 50 °C and holding at this temperature for 30 minutes.

EFFECT: method provides high degree of chromium sorption in form of chromium (VI) ions.

1 cl, 2 dwg, 1 tbl, 3 ex