The invention relates to a method for preparing
graphene oxide, belonging to the technical field of preparation of
graphene oxide. The method comprises the following steps: firstly, preparing
graphite oxide by adopting a
chemical treatment method for natural crystalline
flake graphite; then, separating and purifying the
graphite oxide; and finally, mixing the purified
graphite oxide with water, carrying out
ultrasonic dispersion to obtain stable dispersion liquid, and spraying and
drying the dispersion liquid to obtain
graphene oxide
powder. According to the method for preparing graphene oxide, effective separation of
graphite oxide solid and aqueous liquor is realized by room-temperature natural
settling of
graphite oxide suspension, most of inorganic
ion impurities generated in a preparation process are removed with supernatant liquid, so that a washing step is simplified. Moreover, a centrifugal washing method of absolute ethyl
alcohol is adopted,
solid-liquid separation in a centrifugal process is very easy to implement, a problem that
solid-liquid separation is difficult in a water-washing process is overcome, time is greatly saved, and efficiency is improved.