▎ 摘　　要

NOVELTY - Preparing graphene oxide comprises: forming perfluoroalkoxy Teflon (RTM: PTFE) coating iron beads; mixing potassium chlorate solution with distilled water; mixing graphite powder with sulfuric acid and nitric acid to form a graphite mixture and then ultrasonic dispersing; mixing iron beads with graphite mixture and potassium chlorate solution using a magnetic stirrer to generate graphite oxide; separating the iron beads and the graphite oxide and then washing, diluting with deionized water and filtrating by a filter; and vacuum drying and then heating the dried graphite oxide. USE - The method is useful for preparing graphene oxide (claimed) that is useful in polymer composite material, filler, secondary battery, transistor, hydrogen gas reservoir, super-capacitor and biosensor applications. ADVANTAGE - The method is able to produce bulk graphene oxide with enhanced expansion and exfoliation efficiency, excellent dispersibility, high stability, high physical property, high thermal conductance, high electric conductance, high intensity and high specific surface area through ultrasonication process. DETAILED DESCRIPTION - Preparing graphene oxide comprises: forming excellent abrasion and chemical resistance perfluoroalkoxy Teflon (RTM: PTFE) coating iron beads with diameter of less than 2 mm; mixing potassium chlorate solution (90-95%) with distilled water in glass plate under presence of polyethylene-based material at 2 degrees C and then cooling to -5 degrees C; mixing (in wt.%): graphite powder (1) of 1-300 mesh particle size with 90-95% concentration of sulfuric acid (14-18); 85-95% concentration of nitric acid (7-11 wt.%) at 1-5 degrees C and then cooling to form a graphite mixture; dispersing the graphite mixture using ultrasonic waves for 3-4 hours; mixing Teflon (RTM: PTFE)-coated iron beads (1 pts. wt.) with graphite mixture (0.3-0.4 pts. wt.) and potassium chlorate solution using a magnetic stirrer at 1-5 degrees C for 60-65 hours under non-uniform rotation speed to generate a graphite oxide; separating the Teflon (RTM: PTFE)-coated iron and the graphite oxide by centrifugation in supernatant liquid phase, washing the centrifuged graphite oxide with 1-5% concentrated sulfuric acid solution; diluting the washed graphite oxide with an excess of deionized water under pH of 6.8-7.2 and then filtrating using a filter; vacuum drying the filtered graphite oxide for 22-26 hours; and heating the dried graphite oxide by injecting an inert gas at 240-280 degrees C for 20-40 seconds to obtain exfoliated graphene oxide.