▎ 摘　　要

NOVELTY - Graphene ink comprises 99-98 wt.% water, and 1-2 wt.% a complex of non-volatile components including 30-50% humic acid and 70-50% reduced graphene oxide particles. USE - Used as graphene ink. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene ink, comprising ultrasonic treatment of graphene oxide with its subsequent recovery, preferably by carrying out separation and purification of humic acid from acidic peat, then treating extracted humic acid with 30% aqueous ammonia to form ammonium humate, mixing the resulting solution of a water-soluble form of humic acid in reactor with an aqueous suspension of graphene oxide of a concentration of 5-10 mg/ml, mixing and adding 15-20 g a graphene oxide reducing agent e.g. glucose to the resulting mixture, heating the mixture to 70 degrees C and stirring until a black suspension is formed, then centrifuging the suspension and washing the precipitate with deionized water to remove glucose residues, and dispersing the resulting precipitate in water under ultrasonic irradiation at an operating frequency of 22 kHz and a power of 600 watts for 10 minutes.