METHOD OF MODIFYING CELLULOSE-BASED SORBENTS Russian patent published in 2013 - IPC C02F1/62 C02F1/28 B01J20/24 B01J20/32 C02F101/20 

FIELD: chemistry.

SUBSTANCE: invention can be used for improvement of membrane and sorption technologies, in water preparation, in elaboration of technologies for utilisation of ions of heavy metals from water solutions and sewage waters. Method of modification of cellulose-based sorbents includes their successive treatment with solutions of oxidiser, hydroxylamine hydrochloride, hydrogen peroxide and sodium hydroxide with washing with water after each stage. Interaction of sorbents with oxydiser is realised with microwave irradiation with power 300 W, with frequency 2.45 GHz and temperature 25-55°C for 5-15 minutes in solution with concentration 0.1-0.3 M at pH 2.5-4.5 and module solution/sorbent 15-50. Treatment with hydroxylamine hydrochloride is carried out with 0.3-1 M water solution at pH 3-5, module solution/sorbent 15-50 for 40-60 min. treatment with hydrogen peroxide id performed with its 30% solution at pH 5-7 for 30-60 min at room temperature and module solution/sorbent 15-50. Treatment with sodium hydroxide solution is carried out at pH 8-9 for 5 min at room temperature. As oxidiser preferably used is sodium metaperiodate, periodic acid or sodium hypochlorite, and as sorbents - cotton or wood cellulose, short flax fibre or sawdust.

EFFECT: invention makes it possible to increase degree of extraction of ions of heavy metals from solutions with concentration of metal ions to 1,5 mmol/l by 13-15% and reduce sorption time to 1-20 min.

2 cl, 1 tbl, 5 ex