▎ 摘　　要

NOVELTY - Preparation of graphene oxide includes putting graphite powder into first container filled with mixed acid solution, placing the first container in ice water bath, stirring to obtain first black suspension A, adding potassium permanganate powder into the first black suspension A in the first container to obtain a second black suspension B, heating, stirring to obtain black or brown suspension C, cooling to room temperature, adding deionized water, 30% hydrogen peroxide solution and 1 mol/L hydrochloric acid solution to obtain brown turbid liquid D and washing with deionized water. USE - Preparation of graphene oxide used for preparation of boron-doped reduced graphene oxide (claimed). ADVANTAGE - Compared to prior art chemical vapor deposition and hydrothermal reaction method, the method has simple technique, low cost, environmental protection, high efficiency and low energy consumption. DETAILED DESCRIPTION - Preparation of graphene oxide comprises putting graphite powder into first container filled with mixed acid solution, placing the first container in 0-20 degrees C ice water bath, stirring to obtain first black suspension A, where mixed acid solution is a mixture of 98% sulfuric acid solution and 85% boric acid solution at 10:1-1:1 volume ratio (ml:ml), and the mass volume ratio (g:ml) of graphite powder and mixed acid solution is 1:500-5:500, adding potassium permanganate powder into the first black suspension A in the first container to obtain a second black suspension B, where the mass volume ratio (g:ml) of potassium permanganate powder and the first black suspension A is 10:400-20:1000, heating at 25-80 degrees C, stirring to obtain black or brown suspension C, cooling to room temperature, adding deionized water, 30% hydrogen peroxide solution and 1 mol/L hydrochloric acid solution to obtain brown turbid liquid D, where the volume ratio of black or brown suspension C, deionized water, hydrogen peroxide solution, and hydrochloric acid solution is 400:300:10:50, washing the brown turbid liquid D with deionized water, centrifugally separating to obtain brown or black brown sediment E, vacuum drying at constant temperature, and obtaining the product. An INDEPENDENT CLAIM is included for preparation of boron-doped reduced graphene oxide comprising adding graphene oxide powder and boric acid powder at 1:1-3:1 (g:g) ratio into second container filled with deionized water, stirring to obtain brown suspension F, vacuum drying at constant temperature, where the mass volume ratio (g:ml) of graphene oxide and deionized water is 1:200-1:500, obtaining sheet precursor G, adding in dielectric barrier discharge reactor, plasma processing at room temperature and atmospheric pressure for 3-10 minutes, obtaining sample H, washing, vacuum drying, and obtaining the product.