▎ 摘　　要

NOVELTY - Carboxymethyl chitosan is added to ultrapure water, reacted, to obtain aqueous solution of carboxymethyl chitosan. Strontium ferrite nanopowder is then added, mixed, liquid paraffin is dripped, stirred and emulsified, to obtain emulsion. Graphene oxide and glutaraldehyde solution are added, reacted, pH value is adjusted to 9-10, reacted, cooled, washed, solid is separated by powerful magnets, dried and milled, to obtain strontium ferrite-carboxymethyl chitosan-graphene oxide magnetic adsorbent. USE - Preparation of strontium ferrite-carboxymethyl chitosan-graphene oxide magnetic adsorbent used in adsorption of cationic dye e.g. methylene blue, malachite green, methyl violet and neutral red (all claimed). ADVANTAGE - The method enables economical preparation of -strontium ferrite-carboxymethyl chitosan-graphene oxide magnetic adsorbent having high adsorptivity with respect to cationic dye. DETAILED DESCRIPTION - 0.2-0.4 g Carboxymethyl chitosan is added to 30 mL ultrapure water and ultrasonically reacted at room temperature for 3 hours, to obtain aqueous solution of carboxymethyl chitosan. 0.05-0.15 g Strontium ferrite nanopowder is added to aqueous solution of carboxymethyl chitosan, mixed using electric mixer for 1.5 hours, 2-4 mL liquid paraffin is then dripped, stirred and emulsified for 30 minutes, to obtain emulsion. 0.1-0.3 g Graphene oxide and 2.5-3.5 mL of 25% glutaraldehyde solution are added to emulsion, reacted at 45-55 degrees C for 1.5 hours, pH value is adjusted to 9-10 using 1 mol/L sodium hydroxide solution, reacted at 75-85 degrees C for 1 hour, cooled to room temperature, washed using petroleum ether, ethanol and ultrapure water, solid is separated by powerful magnets, dried and milled, to obtain strontium ferrite-carboxymethyl chitosan-graphene oxide magnetic adsorbent. An INDEPENDENT CLAIM is included for usage method of strontium ferrite-carboxymethyl chitosan-graphene oxide magnetic adsorbent in adsorption of cationic dye, which involves adding 25 mL cationic dye solution having concentration of 100-150 mg/L into 250 mL Erlenmeyer flask, adjusting pH value to 4, adding 10-13 mg strontium ferrite-carboxymethyl chitosan-graphene oxide magnetic adsorbent, reacting at 25-45 degrees C for 1-2 hours in water bath, remove the suspension, separating the adsorbent by magnetic separation method, measuring cationic dye absorbance using spectrophotometer, drawing absorbance curve, and obtaining amount of adsorbed cationic dye from the absorbance curve.