WATER TREATMENT SORBENTS PREPARATION METHOD Russian patent published in 2006 - IPC B01J20/16 B01J20/26 B01J20/32 

FIELD: water treatment and sorbents.

SUBSTANCE: invention can be used for treating drinking or industrial water with high levels of heavy metal ions and polar organics, in particular dyes. Method comprises treatment of naturally occurring aluminosilicate (zeolite, swollen vermiculite, or mixture thereof) with chitosan solution in dilute acetic acid at aluminosilicate-to-chitosan solution weight ratio 1:1 and final supernatant pH value 8-9. Resulting plastic mass is granulated by extrusion through specified-size dies, granules obtained are dried and then treated with solution of humin acids taken in amount ensuring full binding of chitosan amino groups. Thereafter, sorbent granules are separated from solution and polymer layer formed on the surface of granules is hardened.

EFFECT: achieved combination of high sorbent capacity and good sorbent workability parameters, namely high filterability and strength caused by hardened surface layer on granules.

7 cl, 3 tbl