METHOD FOR OBTAINING ZIF-67 NANOMATERIALS FOR EFFICIENT AND RAPID ADSORPTION OF ORGANIC DYES FROM AQUEOUS MEDIA

Abstract

This utility model relates to environmental engineering, water treatment, and adsorption technologies, specifically to a method for producing the metal-organic framework nanomaterial ZIF-67 and its use for removing organic dyes from aqueous media. The method for producing the ZIF-67 nanomaterial enables the production of a microporous adsorbent with high sorption capacity through the interaction of a divalent cobalt salt with 2-methylimidazole in a liquid medium, followed by isolation, washing, and drying of the target product.The nanomaterial is obtained as follows: Co(NO₃)₂·6H₂O is dissolved in a mixture of deionized water and ethanol, 2-methylimidazole is separately dissolved in ethanol, then the solutions are mixed and stirred at a temperature of 25°C at a speed of 300 rpm for 6 hours, after which the resulting ZIF-67 particles are separated by high-speed centrifugation, repeatedly washed with anhydrous ethanol with repeated centrifugation after each wash, and dried in a vacuum at a temperature of 80°C for 12 hours. The resulting powdered material is used as an adsorbent for the removal of organic dyes from aqueous solutions, including malachite green, Congo red, and crystal violet. The technical result is the production of ZIF-67 nanomaterial with a developed porous structure, a high specific surface area, and pronounced adsorption properties, ensuring the effective removal of organic dyes from water.