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 B01J20/02 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 extracting heavy metal ions from aqueous solutions is presented, which consists in mixing a chitosan solution in 1% acetic acid with a dispersion of the reinforcing material in distilled water with a mass ratio of the reinforcing material and chitosan of 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, subsequent drip introduction of the prepared mixture into an aqueous solution of sodium tripolyphosphate with a concentration of 0.05 M while stirring, holding the formed microspheres in it, followed by their separation from the dispersion medium and thorough washing with distilled water from the unreacted sodium tripolyphosphate, characterized by the fact that the holding 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 and thionyl chloride-treated carbon nanotubes Taunit M in toluene in an amount of 10-20 wt.% of the sorbent mass with the toluene/sorbent 1-2 module at room temperature for 1-2 hours, then the finished sorbent is separated from toluene is filtered, washed with distilled water and dried, at the same time, the oxidation of these carbon nanotubes Taunit M is carried out with concentrated sulfuric acid at a module of 50-100 at room temperature for 60-90 minutes, then the carbon nanotubes are separated, washed with distilled water, dried, the treatment of carbon nanotubes with thionyl chloride is carried out at a module of thionyl chloride/carbon nanotubes 30-50 when heated with a reverse refrigerator at a temperature of 75-80°C for 15-20 minutes with the subsequent separation of carbon nanotubes, washing and drying, and shungite is used as a reinforcing material.

EFFECT: invention provides an increase in the sorption capacity of the sorbent in relation to heavy metal ions, simplifying the processing of composite microspheres based on chitosan in an aqueous solution of sodium tripolyphosphate in the preparation of sorbents.

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