Patent ID: 8871283

Claim:
A method of making a phytosorbent, comprising: a) crushing seed husks that contain lignin, cellulose, melanin, and at least one biologically active carbon-containing substance; b) hydrolyzing the crushed seed husks with an 0.1-36% acid solution for 0.3-4.5 hours at boiling temperature and under pressure in the range of 0.1-0.7 MPa, thereby obtaining a hydrolysis product comprising a solid phase and a liquid phase; c) extracting the solid phase of the hydrolysis product, thereby obtaining a solid product; d) rinsing the solid product obtained in step (c) with boiling water; e) rinsing the solid product obtained in step (d) with 0.1-1.0% alkali solution; f) rinsing the solid product obtained in step (e) with softened water; g) drying the solid product obtained in step (f); h) impregnating the solid product obtained in step (g) with silver ions, wherein impregnation is carried out by blending the dried product of step (g) with a silver salt solution, and keeping the blend under static conditions until an equilibrium concentration of silver ions is reached, wherein the ion sorption value is set under Friendlich formula: r=K·C n , where r is the sorption value, mmol/g; K, n are the constants; and C is the equilibrium concentration, g/l.