METHOD FOR OBTAINING A COMPOSITE SORBENT FOR THE EXTRACTION OF HEAVY METAL IONS FROM AQUEOUS SOLUTIONS Russian patent published in 2022 - IPC B01J20/30 B01J20/24 B01J20/26 B01J20/10 C02F1/28 

FIELD: chemical industry.

SUBSTANCE: invention relates to the chemical industry and can be used to improve membrane and sorption technologies in water treatment, in the development of technologies for the utilization of heavy metal ions from aqueous solutions and wastewater of various nature. A method for obtaining a composite sorbent for the extraction of heavy metal ions from aqueous solutions is presented, consisting in mixing a chitosan solution in 1% acetic acid with a dispersion of polymethylsiloxane polyhydrate in distilled water with a mass ratio of polymethylsiloxane polyhydrate and chitosan 1:10-1:2, intensive stirring, gradual addition of epichlorohydrin as a crosslinking agent and stirring until it is completely incorporated into the reaction mixture, the subsequent drip introduction of the prepared mixture into an aqueous solution of sodium tripolyphosphate with a concentration of 0.05 M with stirring, holding the formed microspheres in it, followed by their separation by filtration from the dispersion medium and thorough washing with distilled water from unreacted sodium tripolyphosphate, characterized in that the holding of composite microspheres in an aqueous solution of sodium tripolyphosphate is carried out at room temperature for 20-50 minutes, after washing, the microspheres are modified in a solution of oxidized carbon nanotubes Taunit-M in toluene in an amount of 10-20 wt.% of the sorbent with the toluene/sorbent 1-2 module at room temperature for 1-2 hours, then the finished sorbent is separated from toluene by filtration, washed with distilled water and dried, while the oxidation of these carbon nanotubes Taunit-M is carried out with concentrated nitric acid at a module of 50-100 at room temperature for 60-90 minutes, then the nanotubes are separated, washed with distilled water, dried.

EFFECT: invention provides an increase in the sorption capacity of the sorbent with respect to heavy metal ions, simplifying the processing of composite microspheres based on chitosan and polymethylsiloxane polyhydrate in an aqueous solution of sodium tripolyphosphate when sorbents are obtained.

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