METHOD OF EXTRACTING IONS OF HEAVY METALS FROM AQUEOUS SOLUTIONS Russian patent published in 2013 - IPC C02F1/62 C02F1/28 B01J20/24 B01J20/32 

FIELD: chemistry.

SUBSTANCE: invention can be used to improve membrane and sorption techniques, in water treatment, in techniques for recycling ions of heavy metals from aqueous solutions and waste water. The method is realised by contacting aqueous solutions for 1-20 minutes with cellulose-based polymer sorbents which are modified with microwave radiation with power of 300 W and frequency of 2.45 GHz, with solution/sorbent ratio of 50-200. The sorbents are modified by pre-immersion in aqueous caprolactam solution or caprolactam distillation residue with concentration of 2-20 g/l with modulus of 15-50, followed by pressing and microwave exposure for 1-5 minutes at temperature of 150-200°C. The modified sorbents are brought into contact with aqueous solutions at solution pH 3-7.

EFFECT: method increases degree of extraction of heavy metal ions from weakly acidic solution with pH below 5 by about 20%, while maintaining a high degree of extraction of heavy metal ions from neutral aqueous solutions, and also increases sorbent stability when stored on open air to one year and reduces the number of steps when modifying sorbents.

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