▎ 摘　　要

NOVELTY - Preparing graphene loaded silver-gold/ferroferric oxide, comprises e.g. (1) preparing graphene, (2) preparing graphene oxide-silver, (3) preparing graphene oxide-silver/gold, and (4) preparing final product composed of (D1) adding 0.1875 g sodium acrylate, 0.1875 g sodium acetate and 0.0675 g ferric chloride-hexahydrate into 40 ml mixed solution of ethylene glycol and diethylene glycol in a volume ratio of 1:19, and mixing uniformly resulting solution, (D2) add water-removed graphene oxide-silver/gold into the mixed solution of ethylene glycol and diethylene glycol, and ultrasonic dispersing, (D3) pouring the mixed solution of ethylene glycol and diethylene glycol into 50 ml reactor, then heating in water at 200 degrees C for 10 hours, and (D4) taking out the cooled reaction kettle, centrifugal washing with ethanol and deionized water for 8 minutes at a speed of 9000 revolutions per minute, and placing in centrifuge tube. USE - The method is useful for preparing graphene loaded silver-gold/ferroferric oxide. ADVANTAGE - The graphene loaded silver-gold/ferroferric oxide realizes the detection of the trace arsenides. DETAILED DESCRIPTION - Preparing graphene loaded silver-gold/ferroferric oxide, comprises (1) preparing graphene composed of (A1) adding 0.5 g graphite powder, 3 g potassium permanganate, 63 ml concentrated sulfuric acid and 7 ml phosphoric acid into a 150 ml single neck round bottom flask, and incubating resulting solution at 0 degrees C in a water bath (or oil bath) for 12 hours, (A2) freezing 300 ml deionized water in a refrigerator (not too long that would otherwise freeze-fracturing beaker) while carrying out step (A1), poring the graphite powder solution (not cooled) quickly into deionized water that is well frozen (all ice) under rapid stirring condition, after most of the ice melts, adding 14 ml pure hydrogen peroxide (solution changes from brown to yellow), (A3) allowing to stand the reaction solution to remove upper layer and clear the night, repeating three times, (A4) ultrasonicating the solution after allowing to stand, placing in a dialysis bag (controlling the length of the dialysis bag), and carrying out dialysis for about 3 days, (2) preparing graphene oxide-silver composed of (B1) ultrasonicating graphene solution for 30 minutes under stirring condition (B2) taking 1/20 (i.e. 0.025 g) dissolving liquid (16.5 ml), (B3) dispersing 16.5 ml graphene stock solution in 130 ml deionized water, (B4) adding 200 mg poly-vinyl pyrrolidone (MW of 29000) into the graphene solution, (B5) centrifugal washing the solution for 6 minutes at a speed of 9500 revolutions per minute and dispersing twice in 130 ml water, and ultrasonic treating resulting solution for 30 minutes, (B6) preparing three-neck round bottom flask (250 ml) and condensation tube e.g. glass instrument, (B7) adding the ultrasonically completed graphene solution into the flask, adding 4.5 ml silver nitrate (0.2 mol/l), then stirring uniformly the resulting solution, and heating in an oil bath, (B8) after boiling (at about 130 degrees C) adding 1.650 g sodium citrate (dissolved in water), condensing and refluxing for 2.5 hours (the solution changed from pale yellow to black after addition), (B9) centrifuging the reaction solution for 6 minutes at a speed of 6000 revolutions per minute, and placing in a centrifuge tube, (3) preparing graphene oxide-silver/gold composed of (C1) dispersing the 1/8 prepared graphene oxide-silver solution into 150 ml solution, and ultrasonic treating resulting solution for 10 minutes, (C2) diluting 300 mu l 1% chloroauric acid solution into 30 ml and adding slowly into the graphene oxide-silver solution under stirring condition changes color of the solution from light green to black, and (C3) centrifuging the prepared graphene oxide-silver/gold solution twice for 6 minutes at a speed of 6500 revolutions per minute to remove water, and (4) preparing final product composed of (D1) adding 0.1875 g sodium acrylate, 0.1875 g sodium acetate and 0.0675 g ferric chloride-hexahydrate into 40 ml mixed solution of ethylene glycol and diethylene glycol in a volume ratio of 1:19, and mixing uniformly resulting solution, (D2) add water-removed graphene oxide-silver/gold into the mixed solution of ethylene glycol and diethylene glycol, and ultrasonic dispersing, (D3) pouring the mixed solution of ethylene glycol and diethylene glycol into 50 ml reactor, then heating in water at 200 degrees C for 10 hours, and (D4) taking out the cooled reaction kettle, centrifugal washing with ethanol and deionized water for 8 minutes at a speed of 9000 revolutions per minute, and placing in centrifuge tube.